Recovery processes after repeated supramaximal exercise at the altitude of 4,350 m

Journal of Applied Physiology
Paul RobachJ P Richalet

Abstract

We tested the hypothesis that prolonged exposure to high altitude would impair the restoration of muscle power during repeated sprints. Seven subjects performed two 20-s Wingate tests (WT1 and WT2) separated by 5 min of recovery, at sea level (N) and after 5-6 days at 4,350 m (H). Mean power output (MPO) and O2 deficit were measured during WT. O2 uptake (VO2) and ventilation (VE) were measured continuously. Blood velocity in the femoral artery (FBV) was recorded by Doppler ultrasound during recovery. Arterialized blood pH and concentrations of bicarbonate ([HCO3-]), venous plasma lactate ([La-]), norepinephrine ([NE]), and epinephrine ([Epi]) were measured before and after WT1 and WT2. MPO decreased between WT1 and WT2 by 6.9% in N (P < 0.05) and by 10.7% in H (P < 0.01). H did not further decrease MPO. O2 deficit decreased between WT1 and WT2 in H only (P < 0.01). Peak VO2 after WT was reduced by 30-40% in H (P < 0.01), but excess postexercise O2 consumption was not significantly lowered in H. During recovery in H compared with N, VE, exercise-induced acidosis, and [NE] were higher, [Epi] tented to be higher, [La-] was not altered, and [HCO3-] and FBV were lower. The similar [La-] accumulation was associated with a higher exer...Continue Reading

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Citations

Jul 26, 2019·Medicine and Science in Sports and Exercise·Luca RuggieroChris J McNeil
Mar 17, 2001·High Altitude Medicine & Biology·J P Richalet
Oct 12, 2010·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Jean-Paul RichaletJean-Claude Souberbielle
Jun 27, 2009·High Altitude Medicine & Biology·Markus Amann, Bengt Kayser
Nov 11, 2003·Sports Medicine·Andrew M JonesMark Burnley
Sep 27, 2013·High Altitude Medicine & Biology·Bengt Kayser
Apr 30, 2017·Sports Medicine·Olivier GirardGrégoire P Millet
Nov 21, 2007·European Journal of Applied Physiology·John R ThistlethwaiteBarry W Scheuermann
Mar 27, 2021·Respiratory Physiology & Neurobiology·Walter S Calderón-Gerstein, Gabriela Torres-Samaniego

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