Prolonged heat acclimation and aerobic performance in endurance trained athletes

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Standard

Prolonged heat acclimation and aerobic performance in endurance trained athletes. / Mikkelsen, Jacob; Junge, Nicklas; Piil, Jacob Feder; Morris, Nathan Bradley; Oberholzer, Laura; Siebenmann, Christoph; Lundby, Carsten; Nybo, Lars.

I: Frontiers in Physiology, Bind 10, 1372, 2019.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Harvard

Mikkelsen, J, Junge, N, Piil, JF, Morris, NB, Oberholzer, L, Siebenmann, C, Lundby, C & Nybo, L 2019, 'Prolonged heat acclimation and aerobic performance in endurance trained athletes', Frontiers in Physiology, bind 10, 1372. https://doi.org/10.3389/fphys.2019.01372

APA

Mikkelsen, J., Junge, N., Piil, J. F., Morris, N. B., Oberholzer, L., Siebenmann, C., ... Nybo, L. (2019). Prolonged heat acclimation and aerobic performance in endurance trained athletes. Frontiers in Physiology, 10, [1372]. https://doi.org/10.3389/fphys.2019.01372

Vancouver

Mikkelsen J, Junge N, Piil JF, Morris NB, Oberholzer L, Siebenmann C o.a. Prolonged heat acclimation and aerobic performance in endurance trained athletes. Frontiers in Physiology. 2019;10. 1372. https://doi.org/10.3389/fphys.2019.01372

Author

Mikkelsen, Jacob ; Junge, Nicklas ; Piil, Jacob Feder ; Morris, Nathan Bradley ; Oberholzer, Laura ; Siebenmann, Christoph ; Lundby, Carsten ; Nybo, Lars. / Prolonged heat acclimation and aerobic performance in endurance trained athletes. I: Frontiers in Physiology. 2019 ; Bind 10.

Bibtex

@article{af595d59fef542e3873ccc2525d6082c,
title = "Prolonged heat acclimation and aerobic performance in endurance trained athletes",
abstract = "Heat acclimation (HA) involves physiological adaptations that directly promote exercise performance in hot environments. However, for endurance-athletes it is unclear if adaptations also improve aerobic capacity and performance in cool conditions, partly because previous randomized controlled trial (RCT) studies have been restricted to short intervention periods. Prolonged HA was therefore deployed in the present RCT study including 21 cyclists [38 ± 2 years, 184 ± 1 cm, 80.4 ± 1.7 kg, and maximal oxygen uptake (VO2max) of 58.1 ± 1.2 mL/min/kg; mean ± SE] allocated to either 5½ weeks of training in the heat [HEAT (n = 12)] or cool control [CON (n = 9)]. Training registration, familiarization to test procedures, determination of VO2max, blood volume and 15 km time trial (TT) performance were assessed in cool conditions (14°C) during a 2-week lead-in period, as well as immediately pre and post the intervention. Participants were instructed to maintain total training volume and complete habitual high intensity intervals in normal settings; but HEAT substituted part of cool training with 28 ± 2 sessions in the heat (1 h at 60{\%} VO2max in 40°C; eliciting core temperatures above 39°C in all sessions), while CON completed all training in cool conditions. Acclimation for HEAT was verified by lower sweat sodium [Na+], reduced steady-state heart rate and improved submaximal exercise endurance in the heat. However, when tested in cool conditions both peak power output and VO2max remained unchanged for HEAT (pre 60.0 ± 1.5 vs. 59.8 ± 1.3 mL O2/min/kg). TT performance tested in 14°C was improved for HEAT and average power output increased from 298 ± 6 to 315 ± 6 W (P < 0.05), but a similar improvement was observed for CON (from 294 ± 11 to 311 ± 10 W). Based on the present findings, we conclude that training in the heat was not superior compared to normal (control) training for improving aerobic power or TT performance in cool conditions.",
keywords = "Faculty of Science, Cycling time trial, Maximal oxygen uptake, Exercise, Peak power output, Cycling efficiency",
author = "Jacob Mikkelsen and Nicklas Junge and Piil, {Jacob Feder} and Morris, {Nathan Bradley} and Laura Oberholzer and Christoph Siebenmann and Carsten Lundby and Lars Nybo",
note = "Copyright {\circledC} 2019 Mikkelsen, Junge, Piil, Morris, Oberholzer, Siebenmann, Lundby and Nybo.",
year = "2019",
doi = "10.3389/fphys.2019.01372",
language = "English",
volume = "10",
journal = "Frontiers in Physiology",
issn = "1664-042X",
publisher = "Frontiers Media S.A.",

}

RIS

TY - JOUR

T1 - Prolonged heat acclimation and aerobic performance in endurance trained athletes

AU - Mikkelsen, Jacob

AU - Junge, Nicklas

AU - Piil, Jacob Feder

AU - Morris, Nathan Bradley

AU - Oberholzer, Laura

AU - Siebenmann, Christoph

AU - Lundby, Carsten

AU - Nybo, Lars

N1 - Copyright © 2019 Mikkelsen, Junge, Piil, Morris, Oberholzer, Siebenmann, Lundby and Nybo.

PY - 2019

Y1 - 2019

N2 - Heat acclimation (HA) involves physiological adaptations that directly promote exercise performance in hot environments. However, for endurance-athletes it is unclear if adaptations also improve aerobic capacity and performance in cool conditions, partly because previous randomized controlled trial (RCT) studies have been restricted to short intervention periods. Prolonged HA was therefore deployed in the present RCT study including 21 cyclists [38 ± 2 years, 184 ± 1 cm, 80.4 ± 1.7 kg, and maximal oxygen uptake (VO2max) of 58.1 ± 1.2 mL/min/kg; mean ± SE] allocated to either 5½ weeks of training in the heat [HEAT (n = 12)] or cool control [CON (n = 9)]. Training registration, familiarization to test procedures, determination of VO2max, blood volume and 15 km time trial (TT) performance were assessed in cool conditions (14°C) during a 2-week lead-in period, as well as immediately pre and post the intervention. Participants were instructed to maintain total training volume and complete habitual high intensity intervals in normal settings; but HEAT substituted part of cool training with 28 ± 2 sessions in the heat (1 h at 60% VO2max in 40°C; eliciting core temperatures above 39°C in all sessions), while CON completed all training in cool conditions. Acclimation for HEAT was verified by lower sweat sodium [Na+], reduced steady-state heart rate and improved submaximal exercise endurance in the heat. However, when tested in cool conditions both peak power output and VO2max remained unchanged for HEAT (pre 60.0 ± 1.5 vs. 59.8 ± 1.3 mL O2/min/kg). TT performance tested in 14°C was improved for HEAT and average power output increased from 298 ± 6 to 315 ± 6 W (P < 0.05), but a similar improvement was observed for CON (from 294 ± 11 to 311 ± 10 W). Based on the present findings, we conclude that training in the heat was not superior compared to normal (control) training for improving aerobic power or TT performance in cool conditions.

AB - Heat acclimation (HA) involves physiological adaptations that directly promote exercise performance in hot environments. However, for endurance-athletes it is unclear if adaptations also improve aerobic capacity and performance in cool conditions, partly because previous randomized controlled trial (RCT) studies have been restricted to short intervention periods. Prolonged HA was therefore deployed in the present RCT study including 21 cyclists [38 ± 2 years, 184 ± 1 cm, 80.4 ± 1.7 kg, and maximal oxygen uptake (VO2max) of 58.1 ± 1.2 mL/min/kg; mean ± SE] allocated to either 5½ weeks of training in the heat [HEAT (n = 12)] or cool control [CON (n = 9)]. Training registration, familiarization to test procedures, determination of VO2max, blood volume and 15 km time trial (TT) performance were assessed in cool conditions (14°C) during a 2-week lead-in period, as well as immediately pre and post the intervention. Participants were instructed to maintain total training volume and complete habitual high intensity intervals in normal settings; but HEAT substituted part of cool training with 28 ± 2 sessions in the heat (1 h at 60% VO2max in 40°C; eliciting core temperatures above 39°C in all sessions), while CON completed all training in cool conditions. Acclimation for HEAT was verified by lower sweat sodium [Na+], reduced steady-state heart rate and improved submaximal exercise endurance in the heat. However, when tested in cool conditions both peak power output and VO2max remained unchanged for HEAT (pre 60.0 ± 1.5 vs. 59.8 ± 1.3 mL O2/min/kg). TT performance tested in 14°C was improved for HEAT and average power output increased from 298 ± 6 to 315 ± 6 W (P < 0.05), but a similar improvement was observed for CON (from 294 ± 11 to 311 ± 10 W). Based on the present findings, we conclude that training in the heat was not superior compared to normal (control) training for improving aerobic power or TT performance in cool conditions.

KW - Faculty of Science

KW - Cycling time trial

KW - Maximal oxygen uptake

KW - Exercise

KW - Peak power output

KW - Cycling efficiency

U2 - 10.3389/fphys.2019.01372

DO - 10.3389/fphys.2019.01372

M3 - Journal article

C2 - 31749712

VL - 10

JO - Frontiers in Physiology

JF - Frontiers in Physiology

SN - 1664-042X

M1 - 1372

ER -

ID: 230562302