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The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion

Owen Jeffries, Stephen David Patterson, Mark Waldron Orcid Logo

European Journal of Applied Physiology, Volume: 119, Issue: 5, Pages: 1213 - 1224

Swansea University Author: Mark Waldron Orcid Logo

Abstract

PurposeThe purpose of this study was to determine the primary cues regulating perceived effort and exercise performance using a fixed-RPE protocol in severe and moderate hypoxia.MethodsEight male participants (26 ± 6 years, 76.3 ± 8.6 kg, 178.5 ± 3.6 cm, 51.4 ± 8.0 mL kg− 1 min− 1 V˙ O2max) complete...

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Published in: European Journal of Applied Physiology
ISSN: 1439-6319 1439-6327
Published: Springer 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51608
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spelling 2019-09-03T10:45:01.6260671 v2 51608 2019-08-28 The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion 70db7c6c54d46f5e70b39e5ae0a056fa 0000-0002-2720-4615 Mark Waldron Mark Waldron true false 2019-08-28 STSC PurposeThe purpose of this study was to determine the primary cues regulating perceived effort and exercise performance using a fixed-RPE protocol in severe and moderate hypoxia.MethodsEight male participants (26 ± 6 years, 76.3 ± 8.6 kg, 178.5 ± 3.6 cm, 51.4 ± 8.0 mL kg− 1 min− 1 V˙ O2max) completed three exercise trials in environmental conditions of severe hypoxia (FIO2 0.114), moderate hypoxia (FIO2 0.152), and normoxia (FIO2 0.202). They were instructed to continually adjust their power output to maintain a perceived effort (RPE) of 16, exercising until power output declined to 80% of the peak 30-s power output achieved.ResultsExercise time was reduced (severe hypoxia 428 ± 210 s; moderate hypoxia 1044 ± 384 s; normoxia 1550 ± 590 s) according to a reduction in FIO2 (P < 0.05). The rate of oxygen desaturation during the first 3 min of exercise was accelerated in severe hypoxia (− 5.3 ± 2.8% min− 1) relative to moderate hypoxia (− 2.5 ± 1.0% min− 1) and normoxia (− 0.7 ± 0.3% min− 1). Muscle tissue oxygenation did not differ between conditions (P > 0.05). Minute ventilation increased at a faster rate according to a decrease in FIO2 (severe hypoxia 27.6 ± 6.6; moderate hypoxia 21.8 ± 3.9; normoxia 17.3 ± 3.9 L min− 1). Moderate-to-strong correlations were identified between breathing frequency (r = − 0.718, P < 0.001), blood oxygen saturation (r = 0.611, P = 0.002), and exercise performance.ConclusionsThe primary cues for determining perceived effort relate to progressive arterial hypoxemia and increases in ventilation. Journal Article European Journal of Applied Physiology 119 5 1213 1224 Springer 1439-6319 1439-6327 Arterial oxygen saturation, Hypoxemia, Cognition, Ventilation, Exercise, Altitude 1 3 2019 2019-03-01 10.1007/s00421-019-04111-y https://doi.org/10.1007/s00421-019-04111-y COLLEGE NANME Sport and Exercise Sciences COLLEGE CODE STSC Swansea University 2019-09-03T10:45:01.6260671 2019-08-28T10:48:12.7052601 College of Engineering Engineering Owen Jeffries 1 Stephen David Patterson 2 Mark Waldron 0000-0002-2720-4615 3 0051608-03092019104414.pdf jeffries2019.pdf 2019-09-03T10:44:14.3800000 Output 732935 application/pdf Version of Record true 2019-09-03T00:00:00.0000000 false eng
title The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion
spellingShingle The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion
Mark Waldron
title_short The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion
title_full The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion
title_fullStr The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion
title_full_unstemmed The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion
title_sort The effect of severe and moderate hypoxia on exercise at a fixed level of perceived exertion
author_id_str_mv 70db7c6c54d46f5e70b39e5ae0a056fa
author_id_fullname_str_mv 70db7c6c54d46f5e70b39e5ae0a056fa_***_Mark Waldron
author Mark Waldron
author2 Owen Jeffries
Stephen David Patterson
Mark Waldron
format Journal article
container_title European Journal of Applied Physiology
container_volume 119
container_issue 5
container_start_page 1213
publishDate 2019
institution Swansea University
issn 1439-6319
1439-6327
doi_str_mv 10.1007/s00421-019-04111-y
publisher Springer
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
url https://doi.org/10.1007/s00421-019-04111-y
document_store_str 1
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description PurposeThe purpose of this study was to determine the primary cues regulating perceived effort and exercise performance using a fixed-RPE protocol in severe and moderate hypoxia.MethodsEight male participants (26 ± 6 years, 76.3 ± 8.6 kg, 178.5 ± 3.6 cm, 51.4 ± 8.0 mL kg− 1 min− 1 V˙ O2max) completed three exercise trials in environmental conditions of severe hypoxia (FIO2 0.114), moderate hypoxia (FIO2 0.152), and normoxia (FIO2 0.202). They were instructed to continually adjust their power output to maintain a perceived effort (RPE) of 16, exercising until power output declined to 80% of the peak 30-s power output achieved.ResultsExercise time was reduced (severe hypoxia 428 ± 210 s; moderate hypoxia 1044 ± 384 s; normoxia 1550 ± 590 s) according to a reduction in FIO2 (P < 0.05). The rate of oxygen desaturation during the first 3 min of exercise was accelerated in severe hypoxia (− 5.3 ± 2.8% min− 1) relative to moderate hypoxia (− 2.5 ± 1.0% min− 1) and normoxia (− 0.7 ± 0.3% min− 1). Muscle tissue oxygenation did not differ between conditions (P > 0.05). Minute ventilation increased at a faster rate according to a decrease in FIO2 (severe hypoxia 27.6 ± 6.6; moderate hypoxia 21.8 ± 3.9; normoxia 17.3 ± 3.9 L min− 1). Moderate-to-strong correlations were identified between breathing frequency (r = − 0.718, P < 0.001), blood oxygen saturation (r = 0.611, P = 0.002), and exercise performance.ConclusionsThe primary cues for determining perceived effort relate to progressive arterial hypoxemia and increases in ventilation.
published_date 2019-03-01T04:05:16Z
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