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Alternative metabolic strategies are employed by endurance runners of different body sizes; implications for human evolution

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journal contribution
posted on 11.01.2022, 16:45 by Daniel LongmanDaniel Longman, Viviane Merzbach, Jorge Marques Pinto, Laura Hope Atkinson, Jonathan CK Wells, Dan Gordon, Jay T Stock
Objective: A suite of adaptations facilitating endurance running (ER) evolved within the hominin lineage. This may have improved our ability to reach scavenging sites before competitors, or to hunt prey over long distances. Running economy (RE) is a key determinant of endurance running performance, and depends largely on the magnitude of force required to support body mass. However, numerous environmental factors influence body mass, thereby significantly affecting RE. This study tested the hypothesis that alternative metabolic strategies may have emerged to enable ER in individuals with larger body mass and poor RE. Methods: A cohort of male (n = 25) and female (n = 19) ultra-endurance runners completed submaximal and exhaustive treadmill protocols to determine RE, and V̇O2Max. Results: Body mass was positively associated with sub-maximal oxygen consumption at both LT1 (male r=0.66, p<0.001; female LT1 r=0.23, p=0.177) and LT2 (male r=0.59, p=0.001; female r=0.23, p=0.183) and also with V̇O2Max (male r=0.60, p=0.001; female r=0.41, p=0.046). Additionally, sub-maximal oxygen consumption varied positively with V̇O2Max in both male (LT1 r=0.54, p=0.003; LT2 r=0.77, p<0.001) and female athletes (LT1 r=0.88, p<0.001; LT2 r=0.92, p<0.001). Conclusions: The results suggest that, while individuals with low mass and good RE can glide economically as they run, larger individuals can compensate for the negative effects their mass has on RE by increasing their capacity to consume oxygen. The elevated energy expenditure of this low-economy high-energy turnover approach to ER may bring costs associated with energy diversion away from other physiological processes, however.

Funding

European Research Council under the European Union’s Seventh Framework Programme, Grant/Award Number: (FP/ 2007-2013)/ERC Grant Agreement n.617627

History

School

  • Sport, Exercise and Health Sciences

Published in

Adaptive Human Behavior and Physiology

Volume

8

Issue

1

Pages

79 - 97

Publisher

Springer

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

17/12/2021

Publication date

2022-01-10

Copyright date

2022

eISSN

2198-7335

Language

en

Depositor

Dr Danny Longman. Deposit date: 11 January 2022