Table 3.

Linear regressions of peak normalized knee and hip extension speed, strength, and power capacities on age group alone, original “Out & Back” Maximum Step Length (MSL) alone, and MSL after accounting for age group (younger=1 and older=2). Regression coefficients shown are for the combined model unless no additional variance was explained by including age group. Kinetics normalized to height (h) in m and weight (wt) in N.

	Age Group Alone		MSL Alone		MSL added to Age Group (Type I SS)			Regression Coefficients *			Total
Capacity	p	R2	p	R2	p (Age Group)	p (MSL)	increment to R2	Constant	Age Group	MSL	R2
Knee Speed [deg/s]	0.0005	0.48	<0.0001	0.66	<0.0001	0.0069	0.18	203.	N/A †	321.	0.66
Knee Strength [Nm/(ht*wt)]	<0.0001	0.64	<0.0001	0.69	<0.0001	0.0265	0.09	0.0231	−0.0103	0.0589	0.73
Knee Power [W/(ht*wt)]	<0.0001	0.79	<0.0001	0.78	<0.0001	0.0105	0.06	0.1470	−0.0884	0.308	0.86
Hip Speed [deg/s]	0.0382	0.21	0.0017	0.41	0.0198	0.0162	0.22	34.8	25.4	353.	0.43
Hip Strength [Nm/(ht*wt)]	0.0314	0.22	0.0018	0.41	0.0172	0.0225	0.20	−0.0154	0.0103	0.171	0.42
Hip Power [W/(ht*wt)]	0.0006	0.47	<0.0001	0.60	0.0002	0.0206	0.14	−0.0640	−0.0352	0.706	0.61

^*Units of all coefficients are same as dependent variable (all independent variables dimensionless)

^†No benefit to including age group in model