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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2019-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0221176 |
| _version_ | 1818361862016729088 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-13T21:23:25Z |
| format | Article |
| id | doaj.art-09af1b7b647e462898cc3ca903235a65 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-13T21:23:25Z |
| publishDate | 2019-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-09af1b7b647e462898cc3ca903235a652022-12-21T23:31:01ZengPublic Library of Science (PLoS)PLoS ONE1932-62032019-01-01148e022117610.1371/journal.pone.0221176Metabolic rate and substrate utilisation resilience in men undertaking polar expeditionary travel.John HattersleyAdrian J WilsonC Doug ThakeJamie Facer-ChildsOliver StotenChris ImrayThe 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.https://doi.org/10.1371/journal.pone.0221176 |
| spellingShingle | 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. PLoS ONE |
| title | 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_short | 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 |
| url | https://doi.org/10.1371/journal.pone.0221176 |
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