Table 3.

Predictive Validity: Correlation of 36-Month Change in Muscle Function and Body Composition for a Period of 36 Months With 36-Month Change in SPSM Using Sample-Weighted Data

Measure	W1 SPSM Minus W4 SPSM
A. Muscle Function and Body Composition	n	Correlation	p Value
Knee extension
Maximum peak torque W1 minus W4*	117	.267	.004
Maximum power W1 minus W4†	117	.235	.012
Maximum total work W1 minus W4‡	117	.317	<.001
Knee flexion
Maximum peak torque W1 minus W4*	117	.172	.069
Maximum power W1 minus W4†	117	.182	.054
Maximum total work W1 minus W4‡	117	.236	.012
Total lean mass W1 minus W4§	124	−.061	.526
Appendicular skeletal mass W1 minus W4§	124	−.014	.886

Notes: SPSM = short portable sarcopenia measure; W1 = Wave 1; W4 = Wave 4.

^*Measured as the average of the maximum peak torque from each of two sets of three repetitions at 60° per second.

^†Measured as the average of the maximum power for one repetition from each of two sets of three repetitions at 60° per second.

^‡Measured as the average maximum total work for one repetition from each of two sets of three repetitions at 60° per second.

^§Measured by dual energy x-ray absorptiometry; bones and head excluded.