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The impact of hydration status on heat acclimation adaptations


Project description

Heat acclimation is well-known to improve thermoregulation and endurance exercise performance in the heat. Although dehydration further impairs endurance exercise performance, it has been suggested that the loss of body water during heat acclimation training sessions may enhance adaptations. 

This PhD project examined the efficacy of a heart rate-controlled heat acclimation intervention with and without dehydration on 1) the adaptive response of traditional heat acclimation makers and exercise performance, 2) haemodynamic and left ventricular function responses to exercise in the heat in euhydrated, and 3) in dehydrated states. 

The results of this project will be used to guide heat acclimation practices in athletes preparing to compete at major events held in hot climatic conditions.

Related Papers 

Travers G, Nichols D, Riding N, González-Alonso J, Périard JD (2020). Heat acclimation with controlled heart rate: influence of hydration status. Med Sci Sports Exerc. 52(8):1815-1824.

Trangmar SJ, González-Alonso J (2019). Heat, hydration and the human brain, heart and skeletal muscles. Sports Med 49 (Suppl 1):S69–S85.

Trangmar SJ, Chiesa ST, Llodio I, Garcia B, Kalsi K, Secher NH & González-Alonso J (2015). Dehydration accelerates reductions in cerebral blood flow during prolonged exercise in the heat without compromising brain metabolism. Am J Physiol Heart Circ Physiol 309, H1598-H1607.  

Trangmar SJ, Chiesa ST, Stock CG, Kalsi KK, Secher NH & González-Alonso J (2014). Dehydration affects cerebral blood flow but not its metabolic rate for oxygen during maximal exercise in trained humans, J Physiol 592, 3143-3160.   

Pearson J, Kalsi KK, Stöhr EJ, Low DA, Barker H, Ali L, González-Alonso J (2013). Haemodynamic responses to dehydration in the resting and exercising human leg. Eur J Appl Physiol 113, 1499-1509.

Stöhr EJ, González-Alonso J, Pearson J, Low DA, Ali L, Barker H & Shave R (2011). Dehydration reduces left ventricular filling at rest and during exercise independent of twist mechanics. J Appl Physiol 111, 891-897.               

Pearson J, Low DA, Stöhr E, Kalsi K, Ali L, Barker H & González-Alonso J (2011). Hemodynamic responses to heat stress in the resting and exercising human leg: insight into the effect of temperature on skeletal muscle blood flow. Am J Physiol Regul Integr Comp Physiol 300, R663-673.   

Stöhr EJ, González-Alonso J, Pearson J, Low DA, Ali L, Barker H & Shave R (2011). Effects of graded heat stress on global left ventricular function and twist mechanics at rest and during exercise in healthy humans. Exp Physiol 96, 114-124.   

Travers G, González-Alonso J, Riding N, Nichols D, Shaw A, Périard JD. (2020). Exercise heat acclimation has minimal effects on left ventricular volumes, cardiac function and systemic hemodynamics in euhydrated and dehydrated humans. Am J Physiol Heart Circ. 319:H965-H979.