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- Title
Effect of regular precooling on adaptation to training in the heat.
- Authors
Choo, Hui C.; Peiffer, Jeremiah J.; Pang, Joel W. J.; Tan, Frankie H. Y.; Aziz, Abdul Rashid; Ihsan, Mohammed; Lee, Jason K. W.; Abbiss, Chris R.
- Abstract
<bold>Purpose: </bold>This study investigated whether regular precooling would help to maintain day-to-day training intensity and improve 20-km cycling time trial (TT) performed in the heat. Twenty males cycled for 10 day × 60 min at perceived exertion equivalent to 15 in the heat (35 °C, 50% relative humidity), preceded by no cooling (CON, n = 10) or 30-min water immersion at 22 °C (PRECOOL, n = 10).<bold>Methods: </bold>19 participants (n = 9 and 10 for CON and PRECOOL, respectively) completed heat stress tests (25-min at 60% [Formula: see text] and 20-km TT) before and after heat acclimation.<bold>Results: </bold>Changes in mean power output (∆MPO, P = 0.024) and heart rate (∆HR, P = 0.029) during heat acclimation were lower for CON (∆MPO - 2.6 ± 8.1%, ∆HR - 7 ± 7 bpm), compared with PRECOOL (∆MPO + 2.9 ± 6.6%, ∆HR - 1 ± 8 bpm). HR during constant-paced cycling was decreased from the pre-acclimation test in both groups (P < 0.001). Only PRECOOL demonstrated lower rectal temperature (Tre) during constant-paced cycling (P = 0.002) and lower Tre threshold for sweating (P = 0.042). However, skin perfusion and total sweat output did not change in either CON or PRECOOL (all P > 0.05). MPO (P = 0.016) and finish time (P = 0.013) for the 20-km TT were improved in PRECOOL but did not change in CON (P = 0.052 for MPO, P = 0.140 for finish time).<bold>Conclusion: </bold>Precooling maintains day-to-day training intensity and does not appear to attenuate adaptation to training in the heat.
- Subjects
HEAT adaptation; WATER immersion; HEART beat; HUMIDITY; HEAT; CLINICAL trials; OXYGEN consumption; PHYSIOLOGICAL adaptation; CYCLING; EXERCISE; BODY temperature regulation; COLD (Temperature)
- Publication
European Journal of Applied Physiology, 2020, Vol 120, Issue 5, p1143
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-020-04353-1