No sex differences in oxygen uptake or extraction kinetics in the moderate or heavy exercise intensity domains

Author:

Solleiro Pons Maria1,Bernert Lina1,Hume Emily1,Hughes Luke2,Williams Zander3,Burnley Mark4,Ansdell Paul5

Affiliation:

1. Department of Sport, Exercise and Rehabilitation, Northumbria University, United Kingdom

2. Sport Exercise & Rehabilitation, Northumbria University, Newcastle upon Tyne, United Kingdom

3. Department of Respiratory Medicine, Royal Brompton Hospital, London, United Kingdom

4. School of Sport and Exercise Sciences, Loughborough University, Loughborough, United Kingdom

5. Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne, United Kingdom

Abstract

The integrative response to exercise differs between sexes, with oxidative energy contribution purported as a potential mechanism. The present study investigated whether this difference was evident in the kinetics of oxygen uptake (V̇O2) and extraction (HHb+Mb) during exercise. Sixteen adults (8 males, 8 females, age: 27±5 years) completed three experimental visits. Incremental exercise testing was performed to obtain lactate threshold and V̇O2peak. Subsequent visits involved three six-minute cycling bouts at 80% of lactate threshold and one 30-minute bout at a work rate 30% between the lactate threshold and power at V̇O2peak. Pulmonary gas exchange and near-infrared spectroscopy of the vastus lateralis were used to continuously sample V̇O2 and HHb+Mb, respectively. The phase II V̇O2 kinetics were quantified using mono-exponential curves during moderate and heavy exercise. Slow component amplitudes were also quantified for the heavy intensity domain. Relative V̇O2peak values were not different between sexes ( p=0.111). Males achieved ~30% greater power outputs ( p=0.002). In the moderate and heavy intensity domains, the relative amplitude of the phase II transition was not different between sexes for V̇O2 (~24 and ~40% V̇O2peak, p≥0.179) and HHb+Mb (~20 and ~32% ischemia, p≥0.193). Similarly, there were no sex differences in the time constants for V̇O2 (~28 s, p≥0.385) or HHb+Mb (~10s, p≥0.274). In the heavy intensity domain, neither V̇O2 ( p≥0.686) or HHb+Mb ( p≥0.432) slow component amplitudes were different between sexes. The oxidative response to moderate and heavy intensity exercise did not differ between males and females, suggesting similar dynamic responses of oxidative metabolism during intensity-matched exercise.

Funder

Physiological Society

EC | Erasmus+

Office for Veteran's Affairs

Publisher

American Physiological Society

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3