Table 2.

Annual rate of change (%year⁻¹) in muscle power and body composition parameters.

Age group (years)		Relative STS power (W kg−1)	Allometric STS power (W m−2)	Specific STS power (W kg−1)	BMI (kg m−2)	Legs SMI (kg m−2)
Men	n
65–69	123	− 1.2 ± 0.2*	− 1.2 ± 0.2*,#	− 0.8 ± 0.2*	− 0.2 ± 0.1*,#	− 0.4 ± 0.1*,#
70–74	188	− 1.2 ± 0.2*	− 1.3 ± 0.2*,#	− 0.9 ± 0.2*	− 0.2 ± 0.1*,#	− 0.4 ± 0.1*,#
75–79	166	− 1.3 ± 0.2*	− 1.3 ± 0.2*	− 0.9 ± 0.2*	− 0.2 ± 0.1*,#	− 0.5 ± 0.1*,#
80–84	105	− 1.4 ± 0.2*	− 1.4 ± 0.2*	− 1.0 ± 0.2*	− 0.2 ± 0.1*,#	− 0.5 ± 0.1*
85–89	29	− 0.1 ± 1.2	− 1.5 ± 0.2*	− 1.0 ± 0.2*	− 0.2 ± 0.1*,#	− 0.5 ± 0.1*
90–94	13	− 0.1 ± 1.2	− 1.7 ± 0.2*	− 1.1 ± 0.2*	− 0.2 ± 0.1*,#	− 0.5 ± 0.1*
95–99	2	− 0.1 ± 1.2	− 1.8 ± 0.3*	− 1.1 ± 0.2*	− 0.2 ± 0.1*,#	− 0.5 ± 0.1*
Women	n
65–69	130	− 1.2 ± 0.1*	− 0.3 ± 0.4#	− 0.6 ± 0.4	0.1 ± 0.2#	0.1 ± 0.1#
70–74	212	− 1.3 ± 0.1*	− 0.3 ± 0.4#	− 0.6 ± 0.4	0.1 ± 0.2#	0.1 ± 0.1#
75–79	220	− 1.4 ± 0.2*	− 2.2 ± 0.6*	− 2.0 ± 1.1*	0.1 ± 0.2#	0.1 ± 0.1#
80–84	132	− 1.5 ± 0.2*	− 2.5 ± 0.7*	− 2.2 ± 1.2*	− 0.9 ± 0.6*,#	− 0.5 ± 0.3
85–89	29	− 1.7 ± 0.2*	− 2.9 ± 0.8*	− 2.5 ± 1.4*	− 0.9 ± 0.7*,#	− 0.5 ± 0.3
90–94	12	− 1.8 ± 0.2*	− 3.3 ± 1.0*	− 2.8 ± 1.6*	− 0.9 ± 0.7*,#	− 0.5 ± 0.3
95–99	8	− 2.0 ± 0.2*	− 4.0 ± 1.2*	− 3.3 ± 1.9*	− 1.0 ± 0.7*,#	− 0.5 ± 0.3

STS sit-to-stand, BMI body mass index, legs SMI legs skeletal muscle index.

*Significantly different compared with a slope equal to zero (p < 0.05).

^#Significant differences between women or men at the same age (p < 0.05).