Table 2. Weekly training-load, fatigue, wellness, and adherence monitoring during the four-week intervention. Variable Week Contrast heat-cold Thermoneutral shower control Period-average difference (95% CI) p-value Training frequency (sessions/week) 4-week average 4.05 ± 0.30 4.13 ± 0.31 -0.08 (-0.24 to 0.09) 0.353 Session-RPE (0-10) 4-week average 6.28 ± 0.45 6.22 ± 0.47 0.06 (-0.19 to 0.30) 0.643 sRPE training load (AU/week) 4-week average 2289 ± 214 2314 ± 264 -26 (-153 to 102) 0.686 Wellness score (AU/week) 4-week average 6.26 ± 0.48 6.13 ± 0.47 0.13 (-0.12 to 0.38) 0.308 Shower-protocol compliance (%) 4-week average 81.07 ± 5.99 82.76 ± 6.06 -1.69 (-4.89 to 1.51) 0.295 Values are mean ± SD. Period-average differences are contrast minus control. sRPE training load was calculated as weekly training frequency × mean session-RPE × 90 minutes, reflecting the approximate duration of the primary training sessions. AU, arbitrary units; CI, confidence interval; RPE, rating of perceived exertion.