The physical capability of community-based men and women from a British cohort: the European Prospective Investigation into Cancer (EPIC)-Norfolk study
© Keevil et al.; licensee BioMed Central Ltd. 2013
Received: 21 May 2013
Accepted: 2 September 2013
Published: 10 September 2013
The European Working Group for Sarcopenia in Older People (EWGSOP) published a case-finding algorithm for sarcopenia, recommending muscle mass measurement in older adults with low grip strength (women <20 kg; men <30 kg) or slow walking speed (≤0.8 m/s). However, the implications of adopting this algorithm into clinical practice are unclear. Therefore, we aimed to explore the physical capability of men and women from a British population-based cohort study.
In the European Prospective Investigation into Cancer-Norfolk study, 8,623 community-based adults (48-92 years old) underwent assessment of grip strength, walking speed, timed chair stands and standing balance. The proportion of older men and women (≥65 years) fulfilling EWGSOP criteria for muscle mass measurement was estimated. Additionally, cross-sectional associations of physical capability with age and sex were explored using linear and logistic regression.
Approximately 1 in 4 older participants (28.8%) fulfilled criteria for muscle mass measurement with a greater proportion of women than men falling below threshold criteria (33.6% versus 23.6%). Even after adjustment for anthropometry, women were 12.4 kg (95% Confidence Interval [CI] 12.0, 12.7) weaker, took 12.0% (95% CI 10.0, 14.0) longer to perform five chair stands and were 1.82 (95% CI 1.48, 2.23) times more likely to be unable to hold a tandem stand for 10 seconds than men, although usual walking speed was similar. Physical capability was inversely associated with age and per year, walking speed decreased by 0.01 m/s (95% CI 0.01, 0.01) and grip strength decreased by 0.49 kg (men; 95% CI 0.46, 0.51) and 0.25 kg (women; 95% CI 0.23, 0.27). Despite this, there was still variation within age-groups and not all older people had low physical capability.
Every effort to optimise functional health in later life should be made since poor function is not inevitable. However, if the EWGSOP sarcopenia case-finding algorithm is endorsed, large proportions of older people could qualify for muscle mass measurement which is not commonly available. Considering population ageing, further discussion is needed over the utility of muscle mass measurement in clinical practice.
KeywordsAg(e)ing Sarcopenia Hand strength Physical capability Sex factors
Population ageing is a global phenomenon and of particular concern in the United Kingdom (UK) as those born in the post-war ‘baby boom’ approach retirement age . Poor health in later life is not inevitable [2, 3] and an important aspect of ‘healthy ageing’ is the maintenance of independent living. Physical capability encompasses the ability to perform essential physical tasks such as washing and dressing. Objective measures of physical capability such as grip strength, walking speed, timed chair stands and standing balance discern a range of function amongst non-disabled older adults  and lower physical capability has been associated with a higher risk of future institutionalisation, disability and death [5, 6].
Physical capability measures have also been suggested as appropriate screening tools for sarcopenia. The European Working Group on Sarcopenia in Older People (EWGSOP) proposed that the presence of low muscle mass with either low muscle strength and/or low physical performance characterises the syndrome . A case-finding algorithm for use in clinical practice proposed that older people (>65 years) with a walking speed of ≤0.8 m/s or with grip strength <20 kg (women) or <30 kg (men) should have an assessment of muscle mass. However, the service development and public health implications of this algorithm are unknown. A feasible and practical way to measure muscle mass accurately in this context has not been agreed. The EWGSOP recommend using Dual-Energy X-ray Absorptiometry (DXA), bioelectrical impedance analysis (BIA) or anthropometric methods (mid-upper arm or calf circumference and skinfold thickness). However, the accuracy of anthropometric methods is uncertain and neither DXA nor BIA are commonly available in routine clinical practice. The widespread use of DXA scanning has been limited by cost and although BIA is more affordable, as well as being feasible in a range of healthcare settings, use in clinical practice has been held back by concerns relating to the validity of measurements in patients e.g., those on diuretics. Additionally, BIA does not measure body composition directly but utilises the different conductance of adipose versus muscle tissue to estimate fat and fat-free mass using prediction equations also incorporating anthropometric measures (e.g., height and weight or BMI). Currently, there is insufficient evidence that prediction equations using both anthropometry and BIA are superior in terms of body composition prediction to equations using height and weight (or BMI) alone . Thus, there has been little impetus to change practice and re-train healthcare staff to incorporate BIA measurement into routine patient assessments.
Furthermore, few population-based studies have published strength and performance measures by age-group and gender, making it difficult to estimate how many older people are likely to fall below thresholds necessitating muscle mass measurement. This is apparent from several recent descriptive meta-analyses of physical capability [9–11]. Data available for synthesis was often from small, convenience samples and of the population-based studies included, most were from the USA. It is difficult to extrapolate findings from these studies to other countries since absolute levels of physical capability vary between populations .
Several UK epidemiological studies have measured physical capability. However, many are birth cohorts [13–16], are small in size [13, 17] or are single sex . This means that some are only able to report across limited age ranges (at least cross-sectionally), have small numbers within each age and sex strata or can only report on one sex. In the European Investigation into Cancer (EPIC)-Norfolk study, a prospective cohort study, the most recent phase obtained measures of functional performance. At the third health examination (EPIC-Norfolk 3 or 3HC) physical capability was measured objectively in 8,623 community-based men and women aged 48-92 years. This data collection phase enables EPIC-Norfolk to become the largest, single cohort study to report sex-specific values across a range of age-groups for grip strength, walking speed, timed chair stands and standing balance in a population-based sample of British people.
This paper aims to use this information to estimate the impact on healthcare services of applying the EWGSOP recommendations for sarcopenia case-finding, in terms of muscle mass assessment. Cross-sectional associations of physical capability with age and sex will also be explored.
Study design and population
EPIC-Norfolk is a prospective cohort study established as part of an international collaboration . Between 1993 and 1997, 30,445 community-based men and women aged 40-74 years old and registered with participating general practices in Norfolk were enrolled (response rate 43%). The cohort at baseline was similar to participants from the Health Survey for England .
The latest phase of the study, EPIC-Norfolk 3 (2004-2011), focused on aspects of health pertinent to older age and 8,623 participants returned for the 3HC. Signed, informed consent was obtained at baseline and renewed at the 3HC. The study was approved by the Norfolk Local Research Ethics Committee and the East Norfolk and Waveney NHS Research Governance Committee.
In order to evaluate the effects of attrition since baseline, participants who attended both the first and third health examinations were compared to those who attended the first but not the third. Those who did not return were more likely to have been smokers and older, shorter, and heavier with higher blood pressure at baseline .
Physical capability measures
All measures were taken in the EPIC-Norfolk 3 clinic by trained research nurses following standardised protocols. Physical performance measures were based on those used in the Established Populations for the Epidemiologic Study of the Elderly (EPESE) .
Hand grip strength was measured as a marker of general muscle strength  using a hand-held dynamometer (Smedley’s Dynamometer, Scandidact, Kvistgaard, Denmark). Participants performed the test standing and two measures with each hand were recorded, alternating between hands . Participants who were unable to stand performed the test sitting. The maximum strength recorded was used in analyses.
Usual walking speed was measured along a 4 metre (m) course. Participants wore comfortable shoes or walked in bare feet, could use a walking aid and began the test from a standing start. Timing began when the participant’s foot first crossed the start line after the command ‘Go’ and stopped when the finish line was crossed, although participants kept walking towards a red line 1 m further. Two trials of the test were performed and walking speed was estimated by dividing 4 m by the average of the two times recorded.
A straight-backed chair, placed against a wall, with a hard seat and standard height was used for all chair stands. Participants were asked to sit with their feet on the floor and both arms folded across their chests. Timing began as soon as the command ‘Stand’ was given and stopped when the participant straightened their body after the fifth rise. During the test the examiner counted each rise out aloud. Encouragement to perform the test quickly was given before but not during the test. Participants only performed the test once and for analysis the natural log of the time recorded was used.
The ability to stand for 10 seconds unassisted with feet in a side-by-side, semi-tandem and tandem position was assessed. These standing positions are progressively more challenging and those unable to complete the easier positions did not continue. For analysis, results were dichotomised into those able or unable to hold a tandem stand for 10 seconds.
Height was measured to the nearest 0.1 cm using a stadiometer (Chasmores, UK). Weight was measured to the nearest 0.1 kg using digital scales (Tanita UK Ltd, Middlesex, UK).
Prior to analysis the dataset was cleaned to remove implausible or incongruous results (see Additional file 1). Physical capability measures are presented by 5 year age-group and sex using means (standard deviation, SD), medians (inter-quartile range, IQR) and proportions (frequency, %). The proportion of participants ≥65 years old fulfilling EWGSOP criteria necessitating muscle mass measurement was calculated.
Associations of age and sex with physical capability were evaluated using linear regression with the exception of standing balance, for which logistic regression was used. The resulting regression coefficients represent the mean difference in grip strength (kg), the mean difference in walking speed (m/s), the percentage difference in time to complete five chair stands (×100, %) and the odds of being unable to hold a tandem stand for 10 seconds, per unit change in the independent variable. Height and weight were also included in regression models to adjust results for anthropometric factors. Since height and weight are correlated, sex specific standardised residuals for weight were calculated after regression of weight on height. Hereafter, ‘weight’ refers to weight adjusted for height .
An interaction term between age and sex was also entered into regression models to evaluate whether sex modifies the association of physical capability with age. Additionally, the distributions of strong versus weak and fast versus slow (in terms of usual walking speed) men and women were evaluated across 10 year age groups. Cut points for low grip strength and slow walking speed were <30 kg (men)/ < 20 kg (women) and ≤0.8 m/s, as per the EWGSOP criteria.
Differences in age and sex between participants with and without physical capability data were assessed using T-tests and chi-squared tests.
The characteristics of men and women participating in EPIC-Norfolk 3
Frequency, % (n)
Degree or equivalent
Maximum grip strength, chair stands, usual walking speed and standing balance by sex and 5-year age group in men and women of EPIC-Norfolk 3
Physical capability measure
Maximum grip strength, kg
Usual walking speed, m/s
Time to complete 5 chair rises, s
9.7 (8.2, 12.1)
10.3 (8.4, 12.1)
10.3 (8.2, 12.4)
10.3 (8.7, 12.7)
10.6 (9.0, 12.9)
11.2 (9.5, 13.2)
11.1 (9.4, 13.6)
11.8 (10.0, 14.2)
12.1 (10.1, 14.8)
13.0 (10.9, 15.8)
13.4 (11.4, 16.1)
13.8 (11.4, 16.8)
13.7 (11.5, 16.9)
14.6 (12.0, 18.4)
15.1 (13.4, 19.0)
16.3 (13.6, 20.9)
Standing balance, % (n) able to hold tandem stand for 10 s
Frequency, % (n)
Frequency, % (n)
Association of age with physical capability
Physical capability measure
Regression coefficienta(95% Confidence interval)
Adjusted for height & weight
Maximum grip strength, kg
−0.54* (−0.57, −0.51)
−0.49* (−0.51, −0.46)
−0.30* (−0.32, −0.28)
−0.25* (−0.27, −0.23)
Usual walking speed, m/s
−0.012* (−0.013, −0.011)
−0.012* (−0.013, −0.011)
−0.014* (−0.015, −0.013)
−0.013* (−0.014, −0.012)
Timed chair stands, ln(s)
0.014* (0.013, 0.016)
0.016* (0.014, 0.017)
0.015* (0.014, 0.016)
0.016* (0.015, 0.018)
Standing balance, OR
1.14* (1.12, 1.16)
1.14* (1.12, 1.16)
1.12* (1.11, 1.13)
1.13* (1.11, 1.14)
The physical capability of women compared to men and evidence for an interaction between age and sex
Regression coefficient (95% Confidence interval)
Physical capability measure
Women compared to mena
Interaction term: Age* Sexb
Adjusted for age
Adjusted for age, height & weight
Adjusted for age
Adjusted for age, height & weight
Maximum grip strength, kg
−15.32* (-15.58, -15.06)
−12.35* (-12.72, -11.98)
Usual walking speed, m/s
−0.05* (-0.06, -0.04)
−0.01 (-0.02, 0.01)
Timed chair stands, ln(s)
0.05* (0.03, 0.06)
0.12* (0.10, 0.14)
Standing balance, OR
1.85* (1.61, 2.12)
1.82* (1.48, 2.23)
0.98 (0.97, 1.00)
0.98 (0.97, 1.00)
Does sex modify associations with age?
An interaction between age and sex was observed for maximum grip strength such that the absolute gap between men and women tapers as age increases (β= 0.24 kg; 95% CI 0.21, 0.27) (Table 4). This did not change after adjustment for height and weight. However, there was no evidence that gender modified the associations of standing balance or timed chair stands with age and only a weak interaction term was observed for walking speed (β= -0.001 m/s; 95% CI -0.002, -0.0001). With respect to usual walking speed, the regression coefficient for the interaction term was very small and indicated that the decline in walking speed across age-groups was slightly steeper in women than men (see also Additional file 2).
Missing physical capability measurements
150 (1.7%), 102 (1.2%) and 1,051 (12.2%) participants did not have grip strength, walking speed or timed chair stand measurements respectively. Compared to those with grip strength measurements, those without were older (70.4 yrs vs 68.7 yrs, p=0.01) and more likely to be female (67.3% vs 55.0%, p=0.003). Similar trends were seen with missing data for walking speed and timed chair stands (data not shown).
To our knowledge, this is the largest cohort study to report age and sex-specific values for objective measures of physical capability in British men and women. Using this data, we found that just over 1 in 4 community-based, older adults in our cohort would meet criteria for muscle mass measurement, if the EWGSOP algorithm for sarcopenia case-finding was applied. This could pose significant challenges to healthcare services, since measurement of muscle mass is not widely available in routine clinical practice.
Few studies have reported the numbers of older people falling below strength and performance thresholds suggested in the EWGSOP algorithm. Data from a recent report of another UK cohort revealed 22% of community-dwelling participants (aged 59-73 years old) enrolled in a physical performance sub-study met criteria for muscle mass measurement . This is comparable to our findings, with the slightly higher proportion reported here explained by the older ages of the participants included, with many older than 73 years. We found that age was strongly and inversely associated with physical capability, consistent with other reports [25–31]. Unadjusted results showed that usual walking speed declined by 0.01 m/s and grip strength by 0.54 kg (men) and 0.30 kg (women) per year. Thus, as age increases more people are likely to fall below the suggested physical capability thresholds necessitating muscle mass assessment and it is not surprising that our older cohort had higher numbers of participants in this category. The inverse association between physical capability and age and the ageing nature of many populations also suggests that the number of people likely to meet criteria necessitating muscle mass measurement is only likely to rise over the coming decades.
We found that a greater proportion of women than men fell below physical capability thresholds, of significance given the increasing numbers of older women in the population. This was despite the use of sex-specific grip strength criteria and reflects the greater functional dependency experienced by older women. Consistent with this, women had weaker grip strength than men, took longer to perform 5 chair stands and had poorer standing balance even after adjustment for age and anthropometry. This concurs with existing literature [25–31] and adds to the observed male-female health-survival paradox , since women are known to have longer life expectancies than men but lower physical capability is a factor associated with a higher risk of death. One possible explanation is that men decline faster than women and this is important for future health. Cross-sectional associations of absolute grip strength with age did show a steeper decline in men than women, but this difference substantially attenuated when the relative change with age was assessed. This suggests that the steeper decline of absolute strength in men is partly explained by the higher strength of young men compared to young women. However, a small age-sex interaction was still observed when relative change in strength was examined and mixed results have been reported from longitudinal studies examining this interaction [33–35]. Therefore, further work in this area is needed.
The age and sex associations reported here are remarkable in their similarity to those published from the HALCyon study group, after harmonisation and meta-analysis of independent participant data from eight, smaller and heterogenous UK cohorts (see Additional file 3) . Meta-analysis of individual participant data is increasingly advocated . However, large or well-known studies are more likely to be invited to share data creating possible bias and it is still uncertain how much studies can differ and yet still be combined in pooled analyses. Despite this, it is interesting that the size and direction of associations are very similar in this single, large British cohort to those reported in the meta-analysis.
The EWGSOP consensus definition  has provided a much needed opportunity to standardise sarcopenia research in order to progress efforts to untangle its underlying pathogenesis and develop potential therapies. Sarcopenia identified using this definition has been associated with poor self-reported health and physical function  and with future increased risk of mortality . However, the EWGSOP definition has been little scrutinised. A surprisingly low prevalence of sarcopenia (0.9%) was reported when using this definition in Finnish older women  and on examination of the algorithm’s component parts the authors found no association between functional performance and low muscle mass. The predictive power of low muscle mass has been debated previously. Associations with future disability and mortality  have been less consistent and strong [26, 40, 41] than associations between gait speed or muscle strength and future health-related outcomes [4, 5, 42, 43].
Maintenance of physical function with increasing age is important and although we found strong inverse associations between age and physical capability, we also report considerable variation in physical capability within older age-groups. Therefore, it is important to understand the factors leading to this heterogeneity and to develop interventions to mitigate the disability associated with older age and its considerable healthcare cost . However, currently suggested interventions for sarcopenia, such as resistance exercise training, are effective in a wide range of older people including those who do not have confirmed low muscle mass . Considering this and the less strong and consistent associations of muscle mass with future health outcomes, compared to tests of strength and function, whether muscle mass measurement is necessary in the wider clinical setting warrants debate.
The EWGSOP suggested criteria for low muscle strength and slow walking speed also deserve appraisal. These criteria are based on a report from a population-based study in Italy (n=1,020; age 20-85+ years) . However, these cut-off points may not be suitable for all populations, considering differences in absolute physical capability levels reported between populations of different countries [46, 47] even when part of the same study .
It is also possible that levels of physical capability reported here are unusually high or unusually low, limiting our ability to assess the potential impact of applying the EWGSOP algorithm. Other UK and European population-based studies reporting physical capability levels are summarised in Additional file 4: Tables S1 and S2. On average participants in our study walked more quickly than participants from other UK cohorts but were similar in terms of grip strength, particularly to participants from the English Longitudinal Study of Ageing (ELSA). With respect to the faster usual walking speed in our cohort, it could be that selective attrition of participants with poorer health, during the 20 years of follow-up, has resulted in a sample less representative of the general population than the cohort at baseline . However, absolute physical capability levels are difficult to compare between studies, due to differences in measurement protocols [48, 49]. Overcoming this barrier, we measured grip strength using the same dynamometer and protocol to ELSA, whose participants were originally enrolled in the Health Survey for England. Therefore, when using comparable measurement protocols, the physical capability of our cohort is similar to a nationally representative sample.
The EPIC-Norfolk study and measurements taken at the 3HC have some limitations. Associations between age and physical capability are explored using cross-sectional data. Thus, we cannot be certain that we are examining age-related changes in physical capability. Additionally, strength and performance measures were not reported in all participants and data was more likely to be missing in older, female participants. This bias could explain the tapering of the gender gap in maximum grip strength with advancing age. Against this is the relatively low volume of missing data for grip strength (1.7%) and the considerable attenuation of the age-sex interaction when the relative change in grip strength was calculated.
Nevertheless, EPIC-Norfolk 3 comprises a large number of participants from the general population at baseline, with a wide age-range across both sexes. Participants have been examined under standardised conditions by trained research nurses using validated measurement techniques to examine a comprehensive range of physical capability measures. Additionally, any truncation of the cohort due to selective attrition of the frailest members is likely to make some of our findings an underestimation.
Every effort should be made to optimise physical capability in later life since poor function is not inevitable. However, this report of the range of physical capability in community-based men and women of a British cohort reveals the significant potential impact of sarcopenia case-finding on healthcare services, in terms of muscle mass assessment. Considering that populations are ageing, this is only likely to increase and further work is needed to translate sarcopenia research into practical clinical policies that will benefit patients. EPIC-Norfolk 3 will be a useful and rich resource for future investigation of conditions pertinent to ageing.
The EPIC-Norfolk study is funded by programme grants from the Medical Research Council and Cancer Research UK. The clinic used for all 3HC measures was funded by a grant from Research into Ageing. Dr Victoria L Keevil is funded by a Wellcome Trust Clinical Training Fellowship. We would like to thank our study participants and Norfolk General Practitioners without whom the EPIC-Norfolk study would not have been possible. We would also like to thank all research and administrative staff, working in both Norwich and Cambridge, for their hard work and commitment to the study.
- Office for National Statistics: Population Ageing in the United Kingdom, its Constituent Countries and the European Union. Office for National Statistics. 2012Google Scholar
- Khaw K-T, Wareham N, Bingham S, Welch A, Luben R, Day N: Combined impact of health behaviours and mortality in men and women: the EPIC-Norfolk prospective population study. PLoS Med. 2008, 5: e12-10.1371/journal.pmed.0050012.View ArticlePubMedPubMed CentralGoogle Scholar
- Smith MP, Olatunde O, White C: Disability-free life expectancy: comparison of sources and small area estimates in England, 2006–08. Health Statistics Quarterly/Office for National Statistics. 2011, 50: 40-78.View ArticlePubMedGoogle Scholar
- Guralnik JM, Ferrucci L, Simonsick EM, Salive ME, Wallace RB: Lower-extremity function in persons over the age of 70 years as a predictor of subsequent disability. NEJM. 1995, 332: 556-561. 10.1056/NEJM199503023320902.View ArticlePubMedGoogle Scholar
- Cooper R, Kuh D, Hardy R: Objectively measured physical capability levels and mortality: systematic review and meta-analysis. BMJ. 2010, 341: c4467-c4467. 10.1136/bmj.c4467.View ArticlePubMedPubMed CentralGoogle Scholar
- Guralnik JM, Simonsick EM, Ferrucci L, Glynn robert J, Berkman LF, Blazer DG, Scherr PA, Wallace RB: A short physical performance battery assessing lower extremity function: associaton with self-reported disability and prediction of mortality and nursing home admission. J Gerontol. 1994, 49: M85-M94. 10.1093/geronj/49.2.M85.View ArticlePubMedGoogle Scholar
- Cruz-Jentoft AJ, Baeyens JP, Bauer JM, Boirie Y, Cederholm T, Landi F, Martin FC, Michel J-P, Rolland Y, Schneider SM, Topinková E, Vandewoude M, Zamboni M: Sarcopenia: European consensus on definition and diagnosis: report of the European working group on sarcopenia in older people. Age Ageing. 2010, 39: 412-423. 10.1093/ageing/afq034.View ArticlePubMedPubMed CentralGoogle Scholar
- Elia M: Body composition by whole-body bioelectrical impedance and prediction of clinically relevant outcomes: overvalued or underused?. Eur J Clin Nutr. 2013, 67 (Suppl 1): S60-S70.View ArticlePubMedGoogle Scholar
- Bohannon RW, Bear-Lehman J, Desrosiers J, Massy-Westropp N, Mathiowetz V: Average grip strength: a meta-analysis of data obtained with a Jamar dynamometer from individuals 75 years or more of age. J Geriatr Phys Ther. 2007, 30: 28-30. 10.1519/00139143-200704000-00006.View ArticlePubMedGoogle Scholar
- Bohannon RW, Williams Andrews A: Normal walking speed: a descriptive meta-analysis. Physiotherapy. 2011, 97: 182-189. 10.1016/j.physio.2010.12.004.View ArticlePubMedGoogle Scholar
- Bohannon RW: Reference values for the five-repetition sit-to-stand tes: a descriptive meta-analysis of data from elders. Percept Mot Skills. 2006, 103: 215-222.PubMedGoogle Scholar
- Andersen-Ranberg K, Petersen I, Frederiksen H, Mackenbach JP, Christensen K: Cross-national differences in grip strength among 50+ year-old Europeans: results from the SHARE study. Eur J Ageing. 2009, 6: 227-236. 10.1007/s10433-009-0128-6.View ArticleGoogle Scholar
- Syddall HE, Simmonds SJ, Martin HJ, Watson C, Dennison EM, Cooper C, Sayer AA: Cohort profile: the Hertfordshire Ageing Study (HAS). Int J Epidemiol. 2010, 39: 36-43. 10.1093/ije/dyn275.View ArticlePubMedGoogle Scholar
- Syddall HE, Aihie Sayer A, Dennison EM, Martin HJ, Barker DJP, Cooper C: Cohort profile: the Hertfordshire cohort study. Int J Epidemiol. 2005, 34: 1234-1242. 10.1093/ije/dyi127.View ArticlePubMedGoogle Scholar
- Kuh D, Pierce M, Adams J, Deanfield J, Ekelund U, Friberg P, Ghosh AK, Harwood N, Hughes A, Macfarlane PW, Mishra G, Pellerin D, Wong A, Stephen AM, Richards M, Hardy R: Cohort profile: updating the cohort profile for the MRC National Survey of Health and Development: a new clinic-based data collection for ageing research. Int J Epidemiol. 2011, 40: e1-e9. 10.1093/ije/dyq231.View ArticlePubMedPubMed CentralGoogle Scholar
- Deary IJ, Gow AJ, Pattie A, Starr JM: Cohort profile: the Lothian Birth Cohorts of 1921 and 1936. Int J Epidemiol. 2012, 41: 1576-1584. 10.1093/ije/dyr197.View ArticlePubMedGoogle Scholar
- Martin RM, Gunnell D, Pemberton J, Frankel S, Davey Smith G: Cohort profile: the Boyd Orr cohort–an historical cohort study based on the 65 year follow-up of the Carnegie Survey of Diet and Health (1937–39). Int J Epidemiol. 2005, 34: 742-749. 10.1093/ije/dyi124.View ArticlePubMedGoogle Scholar
- The Caerphilly and Speedwell Collaborative Group: Caerphilly and speedwell collaborative heart disease studies. J Epidemiol Community Health. 1984, 38: 259-262.View ArticleGoogle Scholar
- Riboli E: Nutrition and cancer: background and rationale of the European Prospective Investigation into Cancer and Nutrition ( EPIC ). Ann Oncol. 1992, 3: 783-791.PubMedGoogle Scholar
- Day N, Oakes S, Luben R, Khaw KT, Bingham S, Welch A, Wareham N: EPIC-Norfolk: study design and characteristics of the cohort. European Prospective Investigation of Cancer. Br J Cancer. 1999, 80 (Suppl 1): 95-103.PubMedGoogle Scholar
- Hayat SA, Luben R, Keevil VL, Moore S, Dalzell N, Bhaniani A, Khawaja AP, Foster P, Brayne C, Wareham NJ, Khaw K-T: Cohort Profile: a prospective cohort study of objective physical and cognitive capability and visual health in an ageing population of men and women in Norfolk (EPIC-Norfolk 3). Int J Epidemiol. 2013, 1-10. epub ahead of printGoogle Scholar
- Vittasalo JT, Era P, Leskinen A-L, Heikkinen E: Muscular strength profiles and anthropometry in random samples of men aged 31–35, 51–55 and 71–75 years. Ergonomics. 1985, 28: 1563-1574. 10.1080/00140138508963288.View ArticleGoogle Scholar
- Syddall H, Evandrou M, Cooper C, Sayer AA: Social inequalities in grip strength, physical function, and falls among community dwelling older men and women: findings from the Hertfordshire Cohort Study. J Aging Health. 2009, 21: 913-939. 10.1177/0898264309340793.View ArticlePubMedGoogle Scholar
- Patel HP, Syddall HE, Jameson K, Robinson S, Denison H, Roberts HC, Edwards M, Dennison E, Cooper C, Aihie Sayer A: Prevalence of sarcopenia in community-dwelling older people in the UK using the European Working Group on Sarcopenia in Older People (EWGSOP) definition: findings from the Hertfordshire Cohort Study (HCS). Age Ageing. 2013, 42: 378-84. 10.1093/ageing/afs197.View ArticlePubMedPubMed CentralGoogle Scholar
- Aadahl M, Beyer N, Linneberg A, Thuesen BH, Jørgensen T: Grip strength and lower limb extension power in 19–72-year-old Danish men and women: the Health 2006 study. BMJ open. 2011, 1: e000192-10.1136/bmjopen-2011-000192.View ArticlePubMedPubMed CentralGoogle Scholar
- Lauretani F, Russo CR, Bandinelli S, Bartali B, Cavazzini C, Di Iorio A, Corsi AM, Rantanen T, Guralnik JM, Ferrucci L: Age-associated changes in skeletal muscles and their effect on mobility: an operational diagnosis of sarcopenia. J Appl Physiol. 2003, 95: 1851-1860.View ArticlePubMedGoogle Scholar
- Von Heideken WP, Gustafson Y, Lundin-Olsson L: Large variations in walking, standing up from a chair, and balance in women and men over 85 years: an observational study. Aust J Physiother. 2009, 55: 39-45. 10.1016/S0004-9514(09)70059-5.View ArticleGoogle Scholar
- Cooper R, Hardy R, Aihie Sayer A, Ben-Shlomo Y, Birnie K, Cooper C, Craig L, Deary IJ, Demakakos P, Gallacher J, McNeill G, Martin RM, Starr JM, Steptoe A, Kuh D: Age and gender differences in physical capability levels from mid-life onwards: the harmonisation and meta-analysis of data from eight UK cohort studies. PLoS One. 2011, 6: e27899-10.1371/journal.pone.0027899.View ArticlePubMedPubMed CentralGoogle Scholar
- Asher L, Aresu M, Falaschetti E, Mindell J: Most older pedestrians are unable to cross the road in time: a cross-sectional study. Age Ageing. 2012, 41: 690-694. 10.1093/ageing/afs076.View ArticlePubMedGoogle Scholar
- Shumway-cook A, Guralnik JM, Phillips CL, Coppin AK, Ciol MA, Bandinelli S, Ferrucci L: Age-associated declines in complex walking task performance: the Walking InChianti Toolkit. J Am Geriatr Soc. 2007, 55: 58-65. 10.1111/j.1532-5415.2006.00962.x.View ArticlePubMedPubMed CentralGoogle Scholar
- Tolea MI, Costa PT, Terracciano A, Griswold M, Simonsick EM, Najjar SS, Scuteri A, Deiana B, Orrù M, Masala M, Uda M, Schlessinger D, Ferrucci L: Sex-specific correlates of walking speed in a wide age-ranged population. J Gerontology: Psychological Sciences. 2010, 65B: 174-184. 10.1093/geronb/gbp130.View ArticleGoogle Scholar
- Oksuzyan A, Juel K, Vaupel JW, Christensen K: Men: good health and high mortality. Sex differences in health and aging. Aging Clin Exp Res. 2008, 20: 91-102. 10.1007/BF03324754.View ArticlePubMedPubMed CentralGoogle Scholar
- Bassey EJ: Longitudinal changes in selected physical capabilities: muscle strength, flexibility and body size. Age Ageing. 1998, 27 (Suppl 3): 12-16. 10.1093/ageing/27.suppl_3.12.View ArticlePubMedGoogle Scholar
- Rantanen T, Era P, Heikkinen E: Physical activity and the changes in maximal isometric strength in men and women from the age of 75 to 80 years. J Am Geriatr Soc. 1997, 45: 1439-1445.View ArticlePubMedGoogle Scholar
- Nahhas RW, Choh AC, Lee M, Chumlea WMC, Duren DL, Siervogel RM, Sherwood RJ, Towne B, Czerwinski S a: Bayesian longitudinal plateau model of adult grip strength. Am J Hum Biol. 2010, 22: 648-656. 10.1002/ajhb.21057.View ArticlePubMedPubMed CentralGoogle Scholar
- Samet JM: Data: to share or not to share?. Epidemiology. 2009, 20: 172-174. 10.1097/EDE.0b013e3181930df3.View ArticlePubMedGoogle Scholar
- Landi F, Cruz-Jentoft AJ, Liperoti R, Russo A, Giovannini S, Tosato M, Capoluongo E, Bernabei R, Onder G: Sarcopenia and mortality risk in frail older persons aged 80 years and older: results from ilSIRENTE study. Age Ageing. 2013, 42: 203-209. 10.1093/ageing/afs194.View ArticlePubMedGoogle Scholar
- Patil R, Uusi-Rasi K, Pasanen M, Kannus P, Karinkanta S, Sievänen H: Sarcopenia and osteopenia among 70-80-year-old home-dwelling Finnish women: prevalence and association with functional performance. Osteoporos Int. 2013, 24: 787-96. 10.1007/s00198-012-2046-2.View ArticlePubMedGoogle Scholar
- Landi F, Liperoti R, Fusco D, Mastropaolo S, Quattrociocchi D, Proia A, Russo A, Bernabei R, Onder G: Prevalence and risk factors of sarcopenia among nursing home older residents. J Gerontol A Biol Sci Med Sci. 2012, 67: 48-55.View ArticlePubMedGoogle Scholar
- Janssen I: Influence of sarcopenia on the development of physical disability: the Cardiovascular Health Study. J Am Geriatr Soc. 2006, 54: 56-62. 10.1111/j.1532-5415.2005.00540.x.View ArticlePubMedGoogle Scholar
- Newman AB, Kupelian V, Visser M, Simonsick EM, Goodpaster BH, Kritchevsky SB, Tylavsky FA, Rubin SM, Harris TB, on Behalf of the Health A and BCSI: Strength, but not muscle mass, is associated with mortality in the health, aging and body composition study cohort. J Gerontol A Biol Sci Med Sci. 2006, 61: 72-77. 10.1093/gerona/61.1.72.View ArticlePubMedGoogle Scholar
- Cooper R, Kuh D, Cooper C, Gale CR, Lawlor D a, Matthews F, Hardy R: Objective measures of physical capability and subsequent health: a systematic review. Age Ageing. 2011, 40: 14-23. 10.1093/ageing/afq117.View ArticlePubMedGoogle Scholar
- Guralnik JM, Ferrucci L, Pieper CF, Leveille SG, Markides KS, Ostir GV, Studenski S, Berkman LF, Wallace RB: Lower extremity function and subsequent disability: consistency across studies, predictive models, and value of gait speed alone compared with the short physical performance battery. J Gerontol A Biol Sci Med Sci. 2000, 55: M221-M231. 10.1093/gerona/55.4.M221.View ArticlePubMedGoogle Scholar
- Janssen I, Shepard DS, Katzmarzyk PT, Roubenoff R: The healthcare costs of sarcopenia in the United States. J Am Geriatr Soc. 2004, 52: 80-85. 10.1111/j.1532-5415.2004.52014.x.View ArticlePubMedGoogle Scholar
- Liu C, Latham N: Progressive resistance strength training for improving physical function in older adults. Cochrane Database Syst Rev. 2009, 8 (3): CD002759-Google Scholar
- Wu S-W, Wu S-F, Liang H-W, Wu Z-T, Huang S: Measuring factors affecting grip strength in a Taiwan Chinese population and a comparison with consolidated norms. Appl Ergon. 2009, 40: 811-815. 10.1016/j.apergo.2008.08.006.View ArticlePubMedGoogle Scholar
- Keevil V, Mazzuin Razali R, Chin A-V, Jameson K, Aihie Sayer A, Roberts H: Grip strength in a cohort of older medical inpatients in Malaysia: a pilot study to describe the range, determinants and association with length of hospital stay. Arch Gerontol Geriatr. 2013, 56: 155-159. 10.1016/j.archger.2012.10.005.View ArticlePubMedGoogle Scholar
- Roberts HC, Denison HJ, Martin HJ, Patel HP, Syddall H, Cooper C, Sayer AA: A review of the measurement of grip strength in clinical and epidemiological studies: towards a standardised approach. Age Ageing. 2011, 40: 423-429. 10.1093/ageing/afr051.View ArticlePubMedGoogle Scholar
- Graham JE, Ostir GV, Fisher SR, Ottenbacher KJ: Assessing walking speed in clinical research: a systematic review. J Eval Clin Pract. 2008, 14: 552-562. 10.1111/j.1365-2753.2007.00917.x.View ArticlePubMedPubMed CentralGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2318/13/93/prepub
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.