Effects of Ambient Temperature on Physiological Responses to Incremental Exercise Test

The effect of acute heat exposure on the determination of exercise thresholds from ramp and step incremental exercise

“…Second, in the present study, participants were exposed to hot environmental conditions for ∼30 min (i.e., 10 min rest + exercise test). This exposure time is shorter than in the study of Maunder et al (2021) and Tyka et al (2010), where participants rested passively for 20 min and 30 min, respectively. Other studies reported the use of immersion in a hot bath (41°C) for 30 min to induce whole-body hyperthermia before start of incremental exercise (Lorenzo et al, 2011) or do not report the time of exposure before start of the test (de Barros et al, 2011).…”

“…de Barros et al (2011) found that PO corresponding to RCP decreased by 18 % in 40°C in comparison to 22°C (50 % RH) for eight healthy young untrained male participants. Furthermore, Tyka et al (2009;2010) reported a 13 % and 11 % decrease at, respectively, LT (Exp-Dmax) and GET (V-slope method) in 37°C compared to 23°C (55 % RH). Lorenzo et al (2011) found an overall decrease of 12 % in power output at several blood-and ventilationbased thresholds in 12 highly trained endurance cyclists (10 men and 2 women) when cycling in 38°C compared to 13°C (30 % RH).…”

“…Several studies reported changes in threshold occurrence when exercise testing is executed in hot environmental conditions (Tyka et al, 2009;2010;de Barros et al, 2011;Lorenzo et al, 2011;Maunder et al, 2021) and made suggestions on how this additional information could be used for training prescription and monitoring during training camps and tournaments in hot environments. However, these studies do not compare different incremental exercise tests (RAMP and STEP) and/or only include limited exercise threshold concepts.…”

No thermoregulatory or ergogenic effect of dietary nitrate among physically inactive males, exercising above gas exchange threshold in hot and dry conditions

“…Participants then entered the environmental chamber and were instructed to maintain a pedal cadence of 70 rev•min -1 at an intensity equivalent to thermoneutral gas exchange threshold until complete exhaustion. Given the effect of the hot environment on sub-maximal endurance thresholds (Aleksander et al, 2010), the intensity was deemed to be above the thermoneutral gas exchange threshold. Exhaustion was defined as voluntary withdrawal or when pedal cadence dropped below 70 rev•min -1 for more than 10-s.…”