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Table 3 Intra-rater relative and absolute reliability of concentric isokinetic measures of knee extensor and flexor muscle strength at angular velocity of 180°/s

From: Reproducibility of isokinetic measures of the knee and ankle muscle strength in community-dwelling older adults without and with Alzheimer’s disease

Participants

Measures

Knee at 180°/s

Peak torque

(Nm/Kg)

Peak torque

(Nm/Kg)

Average peak torque

(Nm/Kg)

Average peak torque

(Nm/Kg)

Total work

(J)

Total work

(J)

Extension

Flexion

Extension

Flexion

Extension

Flexion

mild-AD

(CDR = 1)

(n = 22)

Session 1, \(\stackrel{-}{\text{X}}\)(SD)

48.5 (18.8)

33.0 (16.1)

39.8 (16.5)

26.1 (15.2)

295.7 (135.3)

101.5 (121.7)

Session 2, \(\stackrel{-}{\text{X}}\)(SD)

51.7 (18.6)

36.3 (18.2)

42.1 (16.3)

28.4 (16.1)

321.1 (145.1)

114.1 (139.4)

ICC3,1 (CI95)

0.79 (0.56–0.90)

0.89 (0.75–0.96)

0.87 (0.68–0.95)

0.98 (0.93–0.99)

0.89 (0.75–0.95)

0.96 (0.91–0.98)

SEM

8.5

5.5

5.9

2.4

45.5

25.2

SEM%

16.4%

15.1%

14.0%

8.4%

14.2%

22.1%

MDC95

19.8

12.9

13.7

5.6

105.6

58.5

MDC95%

38.3%

35.5%

32.5%

19.7%

32.9%

51.3%

moderate-AD

(CDR = 2)

(n = 20)

Session 1, \(\stackrel{-}{\text{X}}\)(SD)

39.1 (13.4)

29.1 (11.5)

32.2 (12.9)

22.3 (11.5)

232.1 (114.9)

64.7 (63.1)

Session 2, \(\stackrel{-}{\text{X}}\)(SD)

41.6 (12.9)

26.1 (10.3)

33.7 (9.9)

19.4 (9.1)

241.4 (109.7)

52.6 (75.9)

ICC3,1 (CI95)

0.75 (0.48–0.89)

0.82 (0.58–0.93)

0.80 (0.49–0.92)

0.91 (0.75–0.97)

0.86 (0.65–0.94)

0.88 (0.70–0.95)

SEM

6.5

4.6

5.1

3.0

41.4

24.0

SEM%

15.6%

15.8%

15.1%

13.4%

17.1%

37.1%

MDC95

15.1

10.7

11.9

7.0

96.0

55.6

MDC95%

36.3%

36.8%

35.3%

31.4%

39.8%

85.9%

without-AD

(n = 20)

Session 1, \(\stackrel{-}{\text{X}}\)(SD)

69.6 (16.6)

47.6 (20.9)

58.7 (13.8)

41.0 (19.7)

544.9 (153.4)

250.8 (204.9)

Session 2, \(\stackrel{-}{\text{X}}\)(SD)

74.0 (20.8)

48.2 (17.3)

63.2 (18.2)

40.7 (16.2)

582.4 (193.7)

274.3 (211.7)

ICC3,1 (CI95)

0.79 (0.54–0.91)

0.91 (0.78–0.96)

0.83 (0.58–0.93)

0.96 (0.90–0.98)

0.88 (0.70–0.95)

0.97 (0.92–0.99)

SEM

8.6

5.7

6.6

3.5

59.6

36.8

SEM%

11.6%

11.8%

10.4%

8.5%

10.2%

13.4%

MDC95

20.0

13.3

15.3

8.1

138.2

85.5

MDC95%

27.0%

27.6%

24.2%

19.7%

23.7%

31.2%

  1. The ICC3,1 was interpreted based on the Munro’s classification (very low: 0.00-0.25, low: 0.26–0.49, moderate: 0.50–0.69, high: 0.70–0.89 and very high: 0.90-1.00); A SEM% value ≤ 10% and MDC% value ≤ 30% were considered acceptable
  2. Equations and formulas: SEM = SD√1-ICC (absolute values); SEM% = SEM / mean of measures x 100% (relative values); MDC95 = SEM×√2 × 1.64 (absolute values); MDC95% = MDC95 / mean of measures x 100% (relative values)
  3. Abbreviations: AD Alzheimer’s disease, CDR Clinical Dementia Rating, ICC3,1 Intraclass correlation coeficiente two-way mixed model of a single-measure, CI95 95% confidence interval, SEM Standard error of measurement; SEM% Percentage of error, MDC95 Minimal detectable change at the 95% confidence interval, MDC95%Percentage of change, n Number of participants, \(\stackrel{-}{\text{X}}\) Mean, SD Standard deviation, Nm/Kg Newton metre per kilogram, J Joules, °/s Degree per second
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BMC Geriatrics

ISSN: 1471-2318

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