Women at altitude: energy requirement at 4,300 m
| Autor: | Barry Braun, R. S. Mazzeo, Jacinda T. Mawson, Paul B. Rock, Lorna G. Moore, Gail E. Butterfield |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Adult
medicine.medical_specialty Time Factors Nitrogen Physiology Energy balance Luteal Phase Biology Energy requirement Acclimatization Catecholamines Oxygen Consumption Altitude Animal science Physiology (medical) Internal medicine medicine Humans Body Weight Elevation Water-Electrolyte Balance Effects of high altitude on humans Endocrinology Follicular Phase Basal (medicine) Basal metabolic rate Body Composition Female Basal Metabolism Energy Intake Energy Metabolism |
| Zdroj: | Journal of Applied Physiology. 88:272-281 |
| ISSN: | 1522-1601 8750-7587 |
| DOI: | 10.1152/jappl.2000.88.1.272 |
| Popis: | To test the hypotheses that prolonged exposure to moderately high altitude increases the energy requirement of adequately fed women and that the sole cause of the increase is an elevation in basal metabolic rate (BMR), we studied 16 healthy women [21.7 +/- 0.5 (SD) yr; 167.4 +/- 1.1 cm; 62.2 +/- 1.0 kg]. Studies were conducted over 12 days at sea level (SL) and at 4,300 m [high altitude (HA)]. To test that menstrual cycle phase has an effect on energetics at HA, we monitored menstrual cycle in all women, and most women (n = 11) were studied in the same phase at SL and HA. Daily energy intake at HA was increased to respond to increases in BMR and to maintain body weight and body composition. Mean BMR for the group rose 6.9% above SL by day 3 at HA and fell to SL values by day 6. Total energy requirement remained elevated 6% at HA [ approximately 670 kJ/day (160 kcal/day) above that at SL], but the small and transient increase in BMR could not explain all of this increase, giving rise to an apparent "energy requirement excess." The transient nature of the rise in BMR may have been due to the fitness level of the subjects. The response to altitude was not affected by menstrual cycle phase. The energy requirement excess is at present unexplained. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|