Table 4.

Pearson partial correlations for mean running traits during week 1, week 25, and week 51 of wheel access and metabolic traits measured immediately prior to each time point. Approximate age of individuals is one year, 1.5, and 2 years

Traits	Age
	~1 year	~1.5 years	~2 years
Distance:Time	0.932b	0.943b	0.938b
Distance:Speed	0.793b	0.827b	0.706b
Distance:VO2	0.04	−0.097	−0.127
Distance:VCO2	−0.002	0.049	0.26
Distance:RER	−0.042	0.165	0.538a
Time:Speed	0.554a	0.661a	0.439a
Time:VO2	0.011	−0.067	−0.184
Time:VCO2	0.04	0.211	0.192
Time:RER	0.07	0.374	0.486a
Speed:VO2	0.075	−0.059	0.108
Speed:VCO2	−0.005	−0.058	0.314
Speed:RER	−0.095	−0.024	0.387
VO2:VCO2	0.837b	0.753b	0.745a
VO2:RER	0.088	0.162	0.037
VCO2:RER	0.613b	0.766b	0.691b

Pearson partial correlations (r; controlling for sex) are shown. Degrees of freedom = 26 for all pairwise comparisons at ~1 year, 20 at ~1.5 years, and 21 for ~2 years.

^a P < 0.05.

^b P < 0.001.