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Repeated-sprint training in hypoxia (RSH) is an increasingly popular method of training in elite athlete cohorts and has been shown to improve repeated-sprint ability in normoxia by 1-5% compared to matched training at sea level. The concurrent use of heat with RSH has been recently investigated as a method of potentially enhancing insession sprint performance. Reportedly, ambient air temperatures of up to 40°C do not negatively affect repeated-sprint cycling performance is not reached.
Studies in normoxia have shown that adding heat to a repeated sprint session can augment overall mechanical power output due to mechanisms such as a faster rate of phosphocreatine utilization and decreased muscle and joint viscous resistance at higher temperatures.