Table 5.

Relationships between muscle strength and TUG or WS explored in a multivariate model

Measure	Timed up and go (sec)				Walking speed (m/min)
Model A
Total model R2		0.19				0.22
P-value		0.005				0.002
Independent variable	B	P	Variation explaineda	CI	B	P	Variation explaineda	CI
Ankle dorsiflexor strength (N/kg)	−0.14	0.40	1.2	−5.6 to 2.3	0.17	0.29	1.9	−0.06 to 0.2
Knee extensor strength (N/kg)	0.03	0.83	0.08	−3.6 to 4.4	−0.06	0.69	0.3	−0.16 to 0.11
Hip abductor strength (N/kg)	0.36	0.05	6.6	−9.5 to − 0.1	0.37	0.04	7.3	0.01 to 0.32
Model B
Total model R2		0.25				0.28
P-value		0.004				0.002
Independent variable	B	P	Variation explaineda	CI	B	P	Variation explaineda	CI
Ankle dorsiflexor strength (N/kg)	0.03	0.86	0.05	−4.4 to 3.7	0.06	0.73	0.2	−0.11 to 0.16
Knee extensor strength (N/kg)	0.10	0.52	0.7	−2.7 to 5.4	−0.11	0.49	0.8	−0.18 to 0.09
Hip abductor strength (N/kg)	−0.46	0.01	10.3	−10.9 to −1.3	0.46	0.01	10.5	0.05 to 0.36
Age (years)	0.21	0.08	5.1	−0.3 to 0.5	−0.27	0.03	8.2	−0.02 to −0.001
LTM (kg)	0.17	0.17	3.2	−0.1 to 0.5	−0.07	0.55	0.6	−0.01 to 0.01

Notes:

^aPercentage of variation explained uniquely by the independent variable after adjustment.

Abbreviations: ASM, appendicular skeletal muscle mass; BMI, body mass index; CI, 95% confidence interval; ht², height squared; LTM, lean soft-tissue mass; SMM, skeletal muscle mass; n/a, not applicable; SMI%, skeletal muscle mass index (%); TUG, timed up and go; WS, walking speed.