High-intensity downhill running exacerbates heart rate and muscular fatigue in trail runners

This study explores the cardiorespiratory and muscular fatigue responses to downhill (DR) vs uphill running (UR) at similar running speed or similar oxygen uptake (⩒O 2 ). Eight well-trained, male, trail runners completed a maximal level incremental test and three 15-min treadmill running trials at...

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Published in:Journal of sports sciences Vol. 39; no. 7; pp. 815 - 825
Main Authors: Lemire, Marcel, Remetter, Romain, Hureau, Thomas J., Kouassi, Blah Y. L., Lonsdorfer, Evelyne, Geny, Bernard, Isner-Horobeti, Marie-Eve, Favret, Fabrice, Dufour, Stéphane P.
Format: Journal Article
Language:English
Published: England Routledge 03.04.2021
Taylor & Francis Ltd
Subjects:
Fatigue
Gait
Heart rate
Hip
HuR protein
inclined treadmill
Isometric
Kinematics
Knee
Mechanical ventilation
muscle torque
Muscles
Oxygen uptake
Respiration
Running
running kinematics
heart rate
Oxygen uptake
inclined treadmill
running kinematics
muscle torque
ISSN:0264-0414, 1466-447X, 1466-447X
Online Access:Get full text
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Summary:This study explores the cardiorespiratory and muscular fatigue responses to downhill (DR) vs uphill running (UR) at similar running speed or similar oxygen uptake (⩒O 2 ). Eight well-trained, male, trail runners completed a maximal level incremental test and three 15-min treadmill running trials at ±15% slope: i) DR at ~6 km·h −1 and ~19% ⩒O 2max (LDR); ii) UR at ~6 km·h −1 and ~70% ⩒O 2max (HUR); iii) DR at ~19 km·h −1 and ~70% ⩒O 2max (HDR). Cardiorespiratory responses and spatiotemporal gait parameters were measured continuously. Maximal isometric torque was assessed before and after each trial for hip and knee extensors and plantar flexor muscles. At similar speed (~6 km·h −1 ), cardiorespiratory responses were attenuated in LDR vs HUR with altered running kinematics (all p < 0.05). At similar ⩒O 2 (~3 l·min −1 ), heart rate, pulmonary ventilation and breathing frequency were exacerbated in HDR vs HUR (p < 0.01), with reduced torque in knee (−15%) and hip (−11%) extensors and altered spatiotemporal gait parameters (all p < 0.01). Despite submaximal metabolic intensity (70% ⩒O 2max ), heart rate and respiratory frequency reached maximal values in HDR. These results further our understanding of the particular cardiorespiratory and muscular fatigue responses to DR and provide the bases for future DR training programs for trail runners.
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ISSN:0264-0414
1466-447X
1466-447X
DOI:10.1080/02640414.2020.1847502