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

Fiche publication

Date publication

avril 2021

Journal

Journal of sports sciences

Auteurs

Membres identifiés du Cancéropôle Est :
Pr FAVRET Fabrice , Pr GENY Bernard

Tous les auteurs :
Lemire M, Remetter R, Hureau TJ, Kouassi BYL, Lonsdorfer E, Geny B, Isner-Horobeti ME, Favret F, Dufour SP

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/33191845

Résumé

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). 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 and ~19% ⩒O (LDR); ii) UR at ~6 km·h and ~70% ⩒O (HUR); iii) DR at ~19 km·h and ~70% ⩒O (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), cardiorespiratory responses were attenuated in LDR vs HUR with altered running kinematics (all < 0.05). At similar ⩒O (~3 l·min), heart rate, pulmonary ventilation and breathing frequency were exacerbated in HDR vs HUR ( < 0.01), with reduced torque in knee (-15%) and hip (-11%) extensors and altered spatiotemporal gait parameters (all < 0.01). Despite submaximal metabolic intensity (70% ⩒O), 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.