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Int J Sports Med 2020; 41(02): 69-74
DOI: 10.1055/a-1015-0333
Physiology & Biochemistry
© Georg Thieme Verlag KG Stuttgart · New York

Cardiorespiratory Changes During Prolonged Downhill Versus Uphill Treadmill Exercise

Yoann Garnier
1   Université de Bourgogne Franche-Comté, Faculty of Sport Sciences, INSERM UMR1093-CAPS, Dijon, France
,
Romuald Lepers
1   Université de Bourgogne Franche-Comté, Faculty of Sport Sciences, INSERM UMR1093-CAPS, Dijon, France
,
Hervé Assadi
2   Université Bourgogne Franche-Comté, CAPS INSERM U1093, Faculty of Sport Sciences, Dijon, France
,
Christos Paizis
1   Université de Bourgogne Franche-Comté, Faculty of Sport Sciences, INSERM UMR1093-CAPS, Dijon, France
3   Université de Bourgogne Franche Comté, Faculty of Sport Sciences, Centre d'Expertise de la Performance, Dijon, France
› Author Affiliations Funding: This work was supported by the French Ministry of Higher Education, Research and Innovation.
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Publication History



accepted 03 September 2019

Publication Date:
02 December 2019 (online)

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Abstract

Oxygen uptake (V̇O2), heart rate (HR), energy cost (EC) and oxygen pulse are lower during downhill compared to level or uphill locomotion. However, a change in oxygen pulse and EC during prolonged grade exercise is not well documented. This study investigated changes in cardiorespiratory responses and EC during 45-min grade exercises. Nine male healthy volunteers randomly ran at 75% HR reserve during 45-min exercise in a level (+1%), uphill (+15%) or downhill (−15%) condition. V̇O2 , minute ventilation (V̇E ) and end-tidal carbon dioxide (PetCO2) were recorded continuously with 5-min averaging between the 10th and 15th min (T1) and 40th and 45th min (T2). For a similar HR (157±3 bpm), V̇O2 , V̇E , and PetCO2 were lower during downhill compared to level and uphill conditions (p<0.01). V̇O2 and V̇E decreased similarly from T1 to T2 for all conditions (all p<0.01), while PetCO2 decreased only for the downhill condition (p<0.001). Uphill exercise required greater EC compared to level and downhill exercises. EC decreased only during the uphill condition between T1 and T2 (p<0.01). The lowest V̇O2 and EC during downhill exercise compared to uphill and level exercises suggests the involvement of passive elastic structures in force production during downhill. The lower cardiorespiratory response and the reduction in PetCO2 during downhill running exercise, while EC remained constant, suggests an overdrive ventilation pattern likely due to a greater stimulation of efferent neural factors.

Key words

treadmill running - oxygen uptake - uphill - downhill - energy cost
 

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