Does severe heat stress reduce VO2max and cardiovascular performance in trained humans?
Severe heat stress limits maximal aerobic capacity in trained humans primarily through cardiovascular limitations, specifically the failure to maintain cardiac output and oxygen delivery to muscles.
These results demonstrate that in trained humans, severe heat stress reduces VO2max by accelerating the declines in cardiac output and mean arterial pressure that lead to decrements in exercising muscle blood flow, O2 delivery, and O2 uptake. Furthermore, the impaired systemic and skeletal muscle aerobic capacity that precedes fatigue with or without heat stress is largely related to the failure of the heart to maintain cardiac output and O2 delivery to locomotive muscle.
González‐Alonso et al. (Tue,) studied this question.
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