Cargando…
Defecation enhances cerebral perfusion and delays fatigue in elite triathletes
BACKGROUND: Rectal distension increases regulatory burden to autonomic nervous system in the brain. PURPOSE: To determine the effect of rectal defecation on endurance performance and blood supply to the prefrontal brain and sub-navel regions of elite triathletes. METHODS: Thirteen elite triathletes...
Autores principales: | , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Routledge
2023
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10142319/ https://www.ncbi.nlm.nih.gov/pubmed/37102434 http://dx.doi.org/10.1080/15502783.2023.2206380 |
_version_ | 1785033584598319104 |
---|---|
author | Wei, Chen-Chan Condello, Giancarlo Yang, Ai-Lun Yu, Szu-Hsien Liao, Yi-Hung Chen, Chung-Yu Hsu, Chi-Chieh Huang, Chi-Yang Kuo, Chia-Hua |
author_facet | Wei, Chen-Chan Condello, Giancarlo Yang, Ai-Lun Yu, Szu-Hsien Liao, Yi-Hung Chen, Chung-Yu Hsu, Chi-Chieh Huang, Chi-Yang Kuo, Chia-Hua |
author_sort | Wei, Chen-Chan |
collection | PubMed |
description | BACKGROUND: Rectal distension increases regulatory burden to autonomic nervous system in the brain. PURPOSE: To determine the effect of rectal defecation on endurance performance and blood supply to the prefrontal brain and sub-navel regions of elite triathletes. METHODS: Thirteen elite triathletes completed a cycling time trial (80% VO(2max)) under defecated and non-defecated conditions, using a counterbalanced crossover design. Oxygenation and blood distribution in prefrontal brain and sub-navel regions were monitored by near-infrared spectroscopy (NIRS) during cycling. RESULTS: Defecation moderately decreased systolic blood pressure (−4 mmHg, p < 0.05, d = 0.71), suggesting an alleviation of autonomic nervous activity. During the exercise trials, fatigue (cycling time to exhaustion) occurred when cerebral oxygenation decreased to ~ 5 % below baseline regardless of treatment conditions, suggesting a critical deoxygenation point for sustaining voluntary exertions. Cerebral blood (estimated by total hemoglobin) increased progressively throughout the entire exercise period. Defecation decreased sub-navel oxygenation levels below the non-defecated level, suggesting an increased sub-navel oxygen consumption. Exercise also decreased sub-navel blood distribution, with minimal difference between non-defecated and defecated conditions. Defecation improved blood pooling in the prefrontal brain during exercise (p < 0.05) and enhanced cycling performance in triathletes (Non-defecated: 1624 ± 138 s vs. defecated: 1902 ± 163 s, d = 0.51, p < 0.05). CONCLUSION: Our results suggest that improved exercise performance after defecation is associated with greater blood availability to compensate deoxygenation in the prefrontal brain region during exercise. Further investigation is needed to examine the role of increasing sub-navel oxygen consumption in the performance improvement after defecation. |
format | Online Article Text |
id | pubmed-10142319 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Routledge |
record_format | MEDLINE/PubMed |
spelling | pubmed-101423192023-04-29 Defecation enhances cerebral perfusion and delays fatigue in elite triathletes Wei, Chen-Chan Condello, Giancarlo Yang, Ai-Lun Yu, Szu-Hsien Liao, Yi-Hung Chen, Chung-Yu Hsu, Chi-Chieh Huang, Chi-Yang Kuo, Chia-Hua J Int Soc Sports Nutr Research Article BACKGROUND: Rectal distension increases regulatory burden to autonomic nervous system in the brain. PURPOSE: To determine the effect of rectal defecation on endurance performance and blood supply to the prefrontal brain and sub-navel regions of elite triathletes. METHODS: Thirteen elite triathletes completed a cycling time trial (80% VO(2max)) under defecated and non-defecated conditions, using a counterbalanced crossover design. Oxygenation and blood distribution in prefrontal brain and sub-navel regions were monitored by near-infrared spectroscopy (NIRS) during cycling. RESULTS: Defecation moderately decreased systolic blood pressure (−4 mmHg, p < 0.05, d = 0.71), suggesting an alleviation of autonomic nervous activity. During the exercise trials, fatigue (cycling time to exhaustion) occurred when cerebral oxygenation decreased to ~ 5 % below baseline regardless of treatment conditions, suggesting a critical deoxygenation point for sustaining voluntary exertions. Cerebral blood (estimated by total hemoglobin) increased progressively throughout the entire exercise period. Defecation decreased sub-navel oxygenation levels below the non-defecated level, suggesting an increased sub-navel oxygen consumption. Exercise also decreased sub-navel blood distribution, with minimal difference between non-defecated and defecated conditions. Defecation improved blood pooling in the prefrontal brain during exercise (p < 0.05) and enhanced cycling performance in triathletes (Non-defecated: 1624 ± 138 s vs. defecated: 1902 ± 163 s, d = 0.51, p < 0.05). CONCLUSION: Our results suggest that improved exercise performance after defecation is associated with greater blood availability to compensate deoxygenation in the prefrontal brain region during exercise. Further investigation is needed to examine the role of increasing sub-navel oxygen consumption in the performance improvement after defecation. Routledge 2023-04-27 /pmc/articles/PMC10142319/ /pubmed/37102434 http://dx.doi.org/10.1080/15502783.2023.2206380 Text en © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent. |
spellingShingle | Research Article Wei, Chen-Chan Condello, Giancarlo Yang, Ai-Lun Yu, Szu-Hsien Liao, Yi-Hung Chen, Chung-Yu Hsu, Chi-Chieh Huang, Chi-Yang Kuo, Chia-Hua Defecation enhances cerebral perfusion and delays fatigue in elite triathletes |
title | Defecation enhances cerebral perfusion and delays fatigue in elite triathletes |
title_full | Defecation enhances cerebral perfusion and delays fatigue in elite triathletes |
title_fullStr | Defecation enhances cerebral perfusion and delays fatigue in elite triathletes |
title_full_unstemmed | Defecation enhances cerebral perfusion and delays fatigue in elite triathletes |
title_short | Defecation enhances cerebral perfusion and delays fatigue in elite triathletes |
title_sort | defecation enhances cerebral perfusion and delays fatigue in elite triathletes |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10142319/ https://www.ncbi.nlm.nih.gov/pubmed/37102434 http://dx.doi.org/10.1080/15502783.2023.2206380 |
work_keys_str_mv | AT weichenchan defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT condellogiancarlo defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT yangailun defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT yuszuhsien defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT liaoyihung defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT chenchungyu defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT hsuchichieh defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT huangchiyang defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes AT kuochiahua defecationenhancescerebralperfusionanddelaysfatigueinelitetriathletes |