Foreign allometric exponents adequately normalize isokinetic knee extension strength to identify muscle weakness and mobility limitation in Portuguese older adults: a cross-sectional study

Table 3 Application of international and Brazilian allometric exponents in Portuguese community-dwelling older adults to normalize isokinetic knee extension peak torque at 60º/s (PT), their accuracy, and cut-off points to identify poor functional performance (lowest quartile of six-minute walk test)

PT	Unit	Portuguese women				Portuguese men				Correlation (r) with body size
PT	Unit	AUC	Cut-off point ( ≤)	sens (%)	spec (%)	AUC	Cut-off point ( ≤)	sens (%)	spec (%)	Body mass	Height	Normalization
Non-normalized	Nm	0.68	87.4	86	51	0.67	132.4	90	48	0.28 ^*	0.29 ^*
/body mass^{0.74 (DAVIES; DALSKY, 1997)}	Nm/kg	0.75	4.10	100	47	0.69	4.46	70	74	-0.19	0.08
/body mass^{0.72 (DAVIES; DALSKY, 1997)}	Nm/kg	0.75	4.46	100	47	0.69	4.89	70	74	-0.18	0.08
/body mass^{0.67 (DAVIES; DALSKY, 1997)}	Nm/kg	0.74	5.51	100	46	0.68	6.15	70	74	-0.15	0.10
/(body mass ^*height)^{0.97 (SEGAL et al., 2008)}	Nm/kg ^*m	0.78	1.00	90	60	0.71	0.98	70	74	-0.41 ^*	-0.15	-0.38^*
/height^{3.27 (ABDALLA et al., 2021)}	Nm/m	0.74	21.0	86	63	0.69	18.8	60	85	-0.01	-0.26 ^*
/(body mass ^*height)^{0.43 (ABDALLA et al., 2021)}	Nm/kg^*m	0.75	12.5	100	49	0.69	13.2	60	78	-0.03	0.11	0.02
/SA^{0.83 (ABDALLA et al., 2021)}	Nm/m²	0.74	58.7	100	47	0.69	62.5	60	78	-0.02	0.12	0.01
/left leg LST^{0.43 (ABDALLA et al., 2021)}	Nm/g	0.69	2.14	93	49	0.72	2.83	100	50	0.07	0.15	0.11
/right leg LST^{0.48 (ABDALLA et al., 2021)}	Nm/g	0.70	1.40	93	46	0.73	1.67	80	75	0.04	0.14	0.10
/legs LST^{0.47 (ABDALLA et al., 2021)}	Nm/g	0.70	1.10	93	46	0.73	1.31	80	75	0.05	0.14	0.10

^* p < 0.05: statistically significant correlation
Note. AUC area under the curve; sens = sensibility; specificity; Nm Newtons meter, SA human body surface estimated by Bailey and Briars equation, LST lean soft tissue

ISSN: 1471-2318