title: Blood lactate and heat stress during training in rowers.
abstract: The purpose of the present study was to test the hypothesis that large increases in blood lactate concentration ([La] (b)) and/or body temperature may occur during an endurance training on a rowing ergometer and disrupt training. The influence of an increase in air convection on the capacity to perform a prolonged exercise was also explored. Ten trained oarsmen were asked to undergo twice, in control (C) and increased air ventilation (AV) conditions, two 30-min trainings on a rowing ergometer at a work rate corresponding to 2.5 mmol . L (-1) of [La] (b) determined during a previous incremental exercise (P (2.5)). Four subjects did not complete the training session in C despite a steady state in [La] (b) in two of them. In these four subjects, the end of the exercise was associated with the highest measured rectal temperatures (T (re), 39.4 +/- 0.1 degrees C) and rate of perceived exertion (RPE, 17.8 +/- 0.3). Regarding the six other subjects, their heart rate, oxygen uptake, RPE, T (re) and water loss values were lower (p < 0.05) in AV than in C. [La] (b) displayed the same profile in C and AV. This study suggests that i) high body temperature may constitute a significant factor of perceived exertion and disrupt indoor training session, and ii) capacity to perform an endurance training on a rowing ergometer was improved by increasing air convection.
authors.affiliation: Laboratory of Biomechanics and Human Modelling, Faculty of Medicine Lyon-Sud, Oullins cedex, France. hugo.maciejewski@univ-lyon1.fr
authors.forename: H
authors.initials: H
authors.lastname: Maciejewski
authors.forename: L
authors.initials: L
authors.lastname: Messonnier
authors.forename: B
authors.initials: B
authors.lastname: Moyen
authors.forename: M
authors.initials: M
authors.lastname: Bourdin
mesh_terms: D000328:Adult; D000389:Air Conditioning; D054874:Athletic Performance / Q000502:physiology*; D001831:Body Temperature / Q000502:physiology; D005080:Exercise Test / Q000379:methods; D018882:Heat Stress Disorders / Q000503:physiopathology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010809:Physical Fitness / Q000502:physiology*; D013177:Sports / Q000502:physiology; D014691:Ventilation
chemical_list: D019344:Lactic Acid