Table 6.

Summary of longitudinal studies of human skeletal muscle aging

Study	n	Baseline Age	Follow-Up Duration, yr	Measurement	Method	%Δ	%Δ/yr
Paraspinals
Murata et al. 2021 (100)	276 M	60–69	10	CSAa	CT	−8	−0.76
	31 W					−10	−1.01
Total: 1 study*	307	65	10				−0.79
Psoas
Murata et al. 2021 (100)	276 M	60–69	10	CSAb	CT	−9	−0.88
	31 W					−4	−0.40
Total: 1 study*	307	65	10				−0.83
Hamstrings
Frontera et al. 2000 (3)	7 M	65 ± 4	12	CSA	CT	−15	−1.22
Total: 1 study	7	65	12				−1.22
Quadriceps
Frontera et al. 2000 (3)	7 M	65 ± 4	12	CSA	CT	−16	−1.32
Total: 1 study	7	65	12				−1.32

Age (yr) is presented as means ± SD, or range. CSA, cross-sectional area; CT, computed tomography; M, men; W, women.

*Data are total n size or average values normalized to the n size of each sex; ^aerector spinae and multifidus; ^bpsoas major.