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The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes
Includes abstract.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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MRC/UCT RU for Exercise and Sport Medicine
2014
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| _version_ | 1867613177065242624 |
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| access_status_str | Open Access |
| author | Joubert, Ilse |
| author2 | Derman, Wayne |
| author_browse | Derman, Wayne Joubert, Ilse |
| author_facet | Derman, Wayne Joubert, Ilse |
| author_sort | Joubert, Ilse |
| collection | Thesis |
| description | Includes abstract. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/2754 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:58.458Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | MRC/UCT RU for Exercise and Sport Medicine |
| publisherStr | MRC/UCT RU for Exercise and Sport Medicine |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/2754 The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes Joubert, Ilse Derman, Wayne Sports Medicine Includes abstract. Includes bibliographical references (leaves 55-79). The effects of long-term participation in ultra-endurance exercise on the cardiovascular system have recently been the subject of much interest. It is well known that HRV, a marker of autonomic activity, is enhanced with long-term aerobic exercise training. However, after acute exercise, HRV is reduced, but recovers over time depending on the intensity of the prior bout of exercise. A limitation of previous research is that exercise bouts of only up to 120 minutes have been studied. A modified Stroop Task is a laboratory stressor to assess executive cognitive function by means of reaction time and accuracy. The resting HRV is directly related to these prefrontal neural functions, but the effect of an altered HRV on cognitive function has never been investigated. We determined the effects of an ultra duration (10 – 15 hours) exercise event on parameters of HRV and cognitive function during a Modified Stroop Task, 60 – 200 minutes after the 2007 South African Ironman Triathlon event (3,6km swim; 180 Km cycle; 42,2 Km run). 1 Female and 13 male competing triathletes (IRON; ages 33.7±7.9) and 7 control subjects (CON; 2 female and 5 males aged 42 ±4.5) completed a Modified Stroop Task before and after the event. The individual HRV parameters, heart rate (HR), respiratory frequency (RF), reaction time (RT) and % of mistakes made were recorded via the Biopac MP150WSW System (Goletta, California, USA). Data was transformed by auto regressive analyses (Biomedical signal analysis group, University of Kuopio, Finland) into LF (0.04 - 0.15 Hz) and HF (0.15 - 0.5 Hz) components. Additional calculations included %LF and %HF as well as the central or peak frequencies in both the LF and HF bands. 2014-07-28T08:23:38Z 2014-07-28T08:23:38Z 2009 Master Thesis Masters MPhil http://hdl.handle.net/11427/2754 eng application/pdf MRC/UCT RU for Exercise and Sport Medicine Faculty of Health Sciences University of Cape Town |
| spellingShingle | Sports Medicine Joubert, Ilse The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes |
| thesis_degree_str | Master's |
| title | The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes |
| title_full | The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes |
| title_fullStr | The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes |
| title_full_unstemmed | The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes |
| title_short | The effects of an ultra-endurance event on heart rate variability and cognitive performance during induced stress in Ironman triathletes |
| title_sort | effects of an ultra endurance event on heart rate variability and cognitive performance during induced stress in ironman triathletes |
| topic | Sports Medicine |
| url | http://hdl.handle.net/11427/2754 |
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