Table 1.

Correlation matrix of measured study variables considered in the structural equation model

Variable	1	2	3	4	5	6	7	8	9	10	11	12	13
1. Age	–
2. BMI	− 0.18	–
3. VL activation	0.14	0.30	–
4. VO2	0.21	− 0.09	− 0.01	–
5. Ventilation	0.41*	0.41*	0.40*	0.37*	–
6. Heart rate	0.36*	0.28	0.44*	0.38*	0.56*	–
7. Lactate	0.40*	0.15	0.50*	0.17	0.54*	0.42*	–
8. RER	0.36*	− 0.07	0.30	0.22	0.54*	0.23	0.51*	–
9. RPE	0.03	− 0.09	0.21	0.25	0.34*	0.24	0.15	0.36*	–
10. Stepping time	− 0.38*	− 0.45*	− 0.08	− 0.14	− 0.52*	− 0.26	− 0.34	− 0.22	0.08	–
11. Energy expenditure	− 0.33*	− 0.45*	− 0.12	− 0.08	− 0.47*	− 0.28	− 0.35*	− 0.27	0.10	0.98*	–
12. Up-down transitions	− 0.19	− 0.41*	− 0.12	− 0.18	− 0.31	− 0.09	− 0.50*	− 0.49*	− 0.02	0.39*	0.36*	–
13. Sitting/lying time	− 0.04	0.38*	− 0.01	− 0.02	0.07	− 0.05	− 0.33	− 0.09	0.04	− 0.61*	− 0.66*	− 0.03	–

BMI body mass index, VL vastus lateralis, VO₂ oxygen consumption, RER respiratory exchange ratio, RPE rating of perceived exertion

*Significant correlation, p < 0.05