Physiologic parameters across 4 months of acclimation
Month 1: 24°C | Month 2: 19°C | Month 3: 24°C | Month 4: 27°C | Ptrend | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
24°C | 19°C | 24°C | 19°C | 24°C | 19°C | 24°C | 19°C | 24°C | 19°C | ||
Total EE (kcal) | 2,472 ± 180 | 2,624 ± 198a | 2,366 ± 358 | 2,543 ± 410a | 2,400 ± 252 | 2,555 ± 346a | 2,341 ± 255 | 2,505 ± 322a | 0.45 | 0.46 | |
Respiratory quotient | 0.84 ± 0.03 | 0.84 ± 0.01 | 0.84 ± 0.02 | 0.83 ± 0.02 | 0.85 ± 0.02 | 0.84 ± 0.02 | 0.84 ± 0.03 | 0.85 ± 0.02 | 0.72 | 0.47 | |
Total activity (units) | 8.4 ± 1.6 | 8.4 ± 2.8 | 7.6 ± 2.9 | 7.1 ± 2.4 | 6.8 ± 3.7 | 7.1 ± 4.1 | 7.9 ± 5.0 | 7.2 ± 4.7 | 0.54 | 0.38 | |
Surface electromyography (×10−6 RMS) | 2.8 ± 0.4 | 2.5 ± 1.3 | 2.7 ± 0.3 | 2.6 ± 0.2 | 2.8 ± 0.5 | 2.7 ± 0.2 | 2.8 ± 0.3 | 2.6 ± 0.4 | 0.98 | 0.83 | |
CIT (%) | 6.2 ± 4.1 | 7.4 ± 3.1 | 6.2 ± 3.9 | 6.8 ± 3.2 | 0.16 | ||||||
DIT (%) | 10.3 ± 13.1 | 33.4 ± 18.2 | 19.0 ± 15.4 | 42.2 ± 17.4a,b | 19.1 ± 16.0 | 37.1 ± 19.6a | 22.5 ± 11.0 | 34.4 ± 19.2a | 0.30 | 0.36 |
Data are means ± SD. At the end of each testing month, subjects underwent acute thermometabolic evaluation at either 24°C or 19°C. RMS, root mean square.
aP < 0.05 compared with 24°C during acute thermometabolic evaluation each month;
bP < 0.05 (month 1 vs. 2) compared with matching measurement at same temperature performed at respective months as indicated.