Marcel Lemire1, Thomas J Hureau2, Fabrice Favret2, Bernard Geny3, Blah Y L Kouassi2, Mourad Boukhari4, Evelyne Lonsdorfer3, Romain Remetter3, Stéphane P Dufour2. 1. University of Strasbourg, Faculty of Medicine, Translational Medicine Federation (FMTS), UR 3072, France; University of Strasbourg, Faculty of Sport Sciences, France. Electronic address: marcel.lemire@unistra.fr. 2. University of Strasbourg, Faculty of Medicine, Translational Medicine Federation (FMTS), UR 3072, France; University of Strasbourg, Faculty of Sport Sciences, France. 3. University of Strasbourg, Faculty of Medicine, Translational Medicine Federation (FMTS), UR 3072, France; University Hospitals of Strasbourg, Physiology and Functional Explorations Department, Civil Hospital, France. 4. University of Strasbourg, Faculty of Sport Sciences, France.
Abstract
OBJECTIVES: Recent studies investigated the determinants of trail running performance (i.e., combining uphill (UR) and downhill running sections (DR)), while the possible specific physiological factors specifically determining UR vs DR performances (i.e., isolating UR and DR) remain presently unknown. This study aims to determine the cardiorespiratory responses to outdoor DR vs UR time-trial and explore the determinants of DR and UR performance in highly trained runners. DESIGN: Randomized controlled trial. METHODS:Ten male highly-trained endurance athletes completed 5-km DR and UR time-trials (average grade: ±8%) and were tested formaximal oxygen uptake, lower limb extensor maximal strength, local muscle endurance, leg musculotendinous stiffness, vertical jump ability, explosivity/agility and sprint velocity. Predictors of DR and UR performance were investigated using correlation and commonality regression analyses. RESULTS:Running velocity was higher in DR vs UR time-trial (20.4±1.0 vs 12.0±0.5km·h-1, p<0.05) with similar average heart rate (95±2% vs 94±2% maximal heart rate; p>0.05) despite lower average V̇O2 (85±8% vs 89±7% V̇O2max; p<0.05). Velocity at V̇O2max (vV̇O2max) body mass index (BMI) and maximal extensor strength were significant predictors of UR performance (r2=0.94) whereas vV̇O2max, leg musculotendinous stiffness and maximal extensor strength were significant predictors of DR performance (r2=0.84). CONCLUSIONS: Five-km UR and DR running performances are both well explained by three independent predictors. If two predictors are shared between UR and DR performances (vV̇O2max and maximal strength), their relative contribution is different and, importantly, the third predictor appears very specific to the exercise modality (BMI for UR vs leg musculotendinous stiffness for DR).
RCT Entities:
OBJECTIVES: Recent studies investigated the determinants of trail running performance (i.e., combining uphill (UR) and downhill running sections (DR)), while the possible specific physiological factors specifically determining UR vs DR performances (i.e., isolating UR and DR) remain presently unknown. This study aims to determine the cardiorespiratory responses to outdoor DR vs UR time-trial and explore the determinants of DR and UR performance in highly trained runners. DESIGN: Randomized controlled trial. METHODS: Ten male highly-trained endurance athletes completed 5-km DR and UR time-trials (average grade: ±8%) and were tested for maximal oxygen uptake, lower limb extensor maximal strength, local muscle endurance, leg musculotendinous stiffness, vertical jump ability, explosivity/agility and sprint velocity. Predictors of DR and UR performance were investigated using correlation and commonality regression analyses. RESULTS: Running velocity was higher in DR vs UR time-trial (20.4±1.0 vs 12.0±0.5km·h-1, p<0.05) with similar average heart rate (95±2% vs 94±2% maximal heart rate; p>0.05) despite lower average V̇O2 (85±8% vs 89±7% V̇O2max; p<0.05). Velocity at V̇O2max (vV̇O2max) body mass index (BMI) and maximal extensor strength were significant predictors of UR performance (r2=0.94) whereas vV̇O2max, leg musculotendinous stiffness and maximal extensor strength were significant predictors of DR performance (r2=0.84). CONCLUSIONS: Five-km UR and DR running performances are both well explained by three independent predictors. If two predictors are shared between UR and DR performances (vV̇O2max and maximal strength), their relative contribution is different and, importantly, the third predictor appears very specific to the exercise modality (BMI for UR vs leg musculotendinous stiffness for DR).
Authors: Johan Cassirame; Antoine Godin; Maxime Chamoux; Gregory Doucende; Laurent Mourot Journal: Int J Environ Res Public Health Date: 2022-09-26 Impact factor: 4.614
Authors: Arash Khassetarash; Gianluca Vernillo; Renata L Krüger; W Brent Edwards; Guillaume Y Millet Journal: J Sport Health Sci Date: 2021-06-21 Impact factor: 13.077