. Author manuscript; available in PMC: 2016 Mar 31.

Published in final edited form as: J Ren Nutr. 2012 Jan 9;22(4):423–433. doi: 10.1053/j.jrn.2011.10.006

Table 2.

Results of Physical Performance Testing, Physical Activity by Accelerometry, and Muscle Size by MRI

Measurement	Mean ± SD, n = 26
Physical performance measures
Usual gait speed, cm/second	123 ± 25
Fast gait speed, cm/second	176 ± 53
6-minute walk, feet (m)	1,434 ± 371 (437 ± 113)
Sit-to-stand time (10 times), seconds	25 ± 9
Standing balance, 1 leg, seconds	18 ± 12
Isokinetic strength
Knee extension at 90°/second, N·m	92 ± 30
Knee extension at 180°/second, N·m	64 ± 23
Isometric strength
MVC knee extension at 60°, N	444 ± 143
Daily activity: accelerometry, arbitrary units	126,233 ± 64,715
Quadriceps muscle (contractile area) CSA, cm²	63.8 ± 12.2

N·m, Newton meter; MVC, maximal voluntary contraction; N, Newton; CSA, cross-sectional area; SD, standard deviation.

Data presented as the mean ± SD.