期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 89, 期 3, 页码 937-946出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jappl.2000.89.3.937
关键词
epinephrine; norepinephrine; metabolism
资金
- NCRR NIH HHS [RR00847] Funding Source: Medline
- NIA NIH HHS [R01AG14799] Funding Source: Medline
- NATIONAL CENTER FOR RESEARCH RESOURCES [M01RR000847] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON AGING [R01AG014799] Funding Source: NIH RePORTER
We examined the relationship between energy expenditure (in kcal) and epinephrine (Epi), norepinephrine (NE), and growth hormone (GH) release. Ten men [age, 26 yr; height, 178 cm; weight, 81 kg; O-2 uptake at lactate threshold (LT), 36.3 ml.kg(-1).min(-1); peak O-2 uptake, 49.5 ml.kg(-1).min(-1)] were tested on six randomly ordered occasions [control, 5 exercise: at 25 and 75% of the difference between LT and rest (0.25LT, 0.75LT), at LT, and at 25 and 75% of the difference between LT and peak (1.25LT, 1.75LT) (0900-0930)]. From 0700 to 1300, blood was sampled and assayed for GH, Epi, and NE. Carbohydrate (CHO) expenditure during exercise and fat expenditure during recovery rose proportionately to increasing exercise intensity (P = 0.002). Fat expenditure during exercise and CHO expenditure during recovery were not affected by exercise intensity. The relationship between exercise intensity and CHO expenditure during exercise could not be explained by either Epi (P = 1.00) or NE (P = 0.922), whereas fat expenditure during recovery increased with Epi and GH independently of exercise intensity (P = 0.028). When Epi and GH were regressed against fat expenditure during recovery, only GH remained statistically significant (P < 0.05). We conclude that a positive relationship exists between exercise intensity and both CHO expenditure during exercise and fat expenditure during recovery and that the increase in fat expenditure during recovery with higher exercise intensities is related to GH release.
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