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In page Cardiovascular drift:

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Prevention or minimization of cardiovascular drift includes consistently replacing fluids and maintaining electrolyte balance during exercise, acclimatization to the environment in which one is performing, and weight training[citation needed] to supplement cardiovascular efforts. Fluid intake can reduce cardiovascular drift during periods of sustained exercise, but maintains VO2 max levels.[1] Vascular function and blood pressure can be negatively affected if dehydration occurs.[2] Short term exercise in extreme heat conditions negatively affects VO2 max levels.[3] Exercise over a longer period of time allows the body to acclimate, minimizing cardiovascular drift.[3]