Table 3. Results of linear regression models with (1) age, sex and body mass as independent variables or with (2) age alone as independent variable.

All dependent variables (power and duration) were log transformed. Exponentiated regression coefficients of the variable age represent annual age-related change (in %).

				Annual age-related change (in %) Model 1	Adjusted R² Model 1	Adjusted R² Model 2
Leg extension			Power (watt)	-0.86	0.77	0.14
Stair ascent	Sensor-based analyses	unloaded	Total ascent duration (s)	0.63	0.32	0.30
			Ascent rise duration (s)	0.66	0.36	0.34
			Power (watt)	-1.38	0.67	0.29
	Duration-based estimation		Power (watt)	-0.63	0.68	0.14
	Sensor-based analyses	loaded (+10%)	Total ascent duration (s)	0.60	0.42	0.34
			Ascent rise duration (s)	0.66	0.42	0.35
			Power (watt)	-1.28	0.69	0.25
	Duration-based estimation		Power (watt)	-0.61	0.77	0.13
Sit-to-stand	Sensor-based analyses	unloaded	Total STS duration	0.25	0.10	0.09
			Sit-to-stand transition duration (s)	0.27	0.18	0.11
			Power (watt)	-0.38	0.71	0.02 (n.s.)
	Duration-based estimation		Power (watt)	-0.42	0.75	0.04
	Sensor-based analyses	loaded (+10%)	Total STS duration	0.26	0.09	0.09
			Sit-to-stand transition duration (s)	0.29	0.10	0.08
			Power (watt)	-0.42	0.74	0.04
	Duration-based estimation		Power (watt)	-0.45	0.75	0.04

P < 0.05, n.s. = not significant