Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel.
The energy expenditure and substrate utilisation were measured in 5 men pre- and post- a 67 day, 1750km unassisted Antarctic traverse from the Hercules Inlet to the Ross Sea Ice via the South pole pulling sledges weighing 120kg whilst experiencing temperatures as low as -57°C. A 36-hours protocol in...
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ftdoajarticles:oai:doaj.org/article:09af1b7b647e462898cc3ca903235a65 2023-05-15T14:03:28+02:00 Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. John Hattersley Adrian J Wilson C Doug Thake Jamie Facer-Childs Oliver Stoten Chris Imray 2019-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0221176 https://doaj.org/article/09af1b7b647e462898cc3ca903235a65 EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pone.0221176 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0221176 https://doaj.org/article/09af1b7b647e462898cc3ca903235a65 PLoS ONE, Vol 14, Iss 8, p e0221176 (2019) Medicine R Science Q article 2019 ftdoajarticles https://doi.org/10.1371/journal.pone.0221176 2022-12-31T04:32:59Z The energy expenditure and substrate utilisation were measured in 5 men pre- and post- a 67 day, 1750km unassisted Antarctic traverse from the Hercules Inlet to the Ross Sea Ice via the South pole pulling sledges weighing 120kg whilst experiencing temperatures as low as -57°C. A 36-hours protocol in a whole body calorimeter was employed to measure periods of rest, sleep and three periods of standardised stepping exercises at 80, 100 and 120 steps min-1; participants were fed isocalorically. Unlike previous expeditions where large weight loss was reported, only a modest loss of body weight (7%, P = 0.03) was found; fat tissue was reduced by 53% (P = 0.03) together with a small, but not statistically significant, increase in lean tissue weight (P = 0.18). This loss occurred despite a high-energy intake (6500 kcal/day) designed to match energy expenditure. An energy balance analysis suggested the loss in body weight could be due to the energy requirements of thermoregulation. Differences in energy expenditure [4.9 (0.1) vs 4.5 (0.1) kcal/min. P = 0.03], carbohydrate utilisation [450 (180) vs 569 (195) g/day; P = 0.03] and lipid utilisation [450 (61) vs 388 (127) g/day, P = 0.03] at low levels of exertion were different from pre-expedition values. Only carbohydrate utilisation remained statistically significant when normalised to body weight. The differences in energy expenditure and substrate utilisation between the pre- and post-expedition for other physiological states (sleeping, resting, higher levels of exercise, etc) were small and not statistically significant. Whilst inter-subject variability was large, there was a tendency for increased carbohydrate utilisation, post-expedition, when fasted that decreased upon feeding. Article in Journal/Newspaper Antarc* Antarctic Ross Sea Sea ice South pole South pole Directory of Open Access Journals: DOAJ Articles Antarctic Ross Sea South Pole Hercules ENVELOPE(161.450,161.450,-77.483,-77.483) Hercules Inlet ENVELOPE(-79.000,-79.000,-80.066,-80.066) PLOS ONE 14 8 e0221176 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q John Hattersley Adrian J Wilson C Doug Thake Jamie Facer-Childs Oliver Stoten Chris Imray Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. |
topic_facet |
Medicine R Science Q |
description |
The energy expenditure and substrate utilisation were measured in 5 men pre- and post- a 67 day, 1750km unassisted Antarctic traverse from the Hercules Inlet to the Ross Sea Ice via the South pole pulling sledges weighing 120kg whilst experiencing temperatures as low as -57°C. A 36-hours protocol in a whole body calorimeter was employed to measure periods of rest, sleep and three periods of standardised stepping exercises at 80, 100 and 120 steps min-1; participants were fed isocalorically. Unlike previous expeditions where large weight loss was reported, only a modest loss of body weight (7%, P = 0.03) was found; fat tissue was reduced by 53% (P = 0.03) together with a small, but not statistically significant, increase in lean tissue weight (P = 0.18). This loss occurred despite a high-energy intake (6500 kcal/day) designed to match energy expenditure. An energy balance analysis suggested the loss in body weight could be due to the energy requirements of thermoregulation. Differences in energy expenditure [4.9 (0.1) vs 4.5 (0.1) kcal/min. P = 0.03], carbohydrate utilisation [450 (180) vs 569 (195) g/day; P = 0.03] and lipid utilisation [450 (61) vs 388 (127) g/day, P = 0.03] at low levels of exertion were different from pre-expedition values. Only carbohydrate utilisation remained statistically significant when normalised to body weight. The differences in energy expenditure and substrate utilisation between the pre- and post-expedition for other physiological states (sleeping, resting, higher levels of exercise, etc) were small and not statistically significant. Whilst inter-subject variability was large, there was a tendency for increased carbohydrate utilisation, post-expedition, when fasted that decreased upon feeding. |
format |
Article in Journal/Newspaper |
author |
John Hattersley Adrian J Wilson C Doug Thake Jamie Facer-Childs Oliver Stoten Chris Imray |
author_facet |
John Hattersley Adrian J Wilson C Doug Thake Jamie Facer-Childs Oliver Stoten Chris Imray |
author_sort |
John Hattersley |
title |
Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. |
title_short |
Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. |
title_full |
Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. |
title_fullStr |
Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. |
title_full_unstemmed |
Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. |
title_sort |
metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2019 |
url |
https://doi.org/10.1371/journal.pone.0221176 https://doaj.org/article/09af1b7b647e462898cc3ca903235a65 |
long_lat |
ENVELOPE(161.450,161.450,-77.483,-77.483) ENVELOPE(-79.000,-79.000,-80.066,-80.066) |
geographic |
Antarctic Ross Sea South Pole Hercules Hercules Inlet |
geographic_facet |
Antarctic Ross Sea South Pole Hercules Hercules Inlet |
genre |
Antarc* Antarctic Ross Sea Sea ice South pole South pole |
genre_facet |
Antarc* Antarctic Ross Sea Sea ice South pole South pole |
op_source |
PLoS ONE, Vol 14, Iss 8, p e0221176 (2019) |
op_relation |
https://doi.org/10.1371/journal.pone.0221176 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0221176 https://doaj.org/article/09af1b7b647e462898cc3ca903235a65 |
op_doi |
https://doi.org/10.1371/journal.pone.0221176 |
container_title |
PLOS ONE |
container_volume |
14 |
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8 |
container_start_page |
e0221176 |
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