Endocrine responses during overnight recovery from exercise: Impact of nutrition and relationships with muscle protein synthesis

Journal article


Betts, James A., Beelen, Milou, Stokes, Keith A., Saris, Wim H. M. and van Loon, Luc J.C.. (2011). Endocrine responses during overnight recovery from exercise: Impact of nutrition and relationships with muscle protein synthesis. International Journal of Sport Nutrition and Exercise Metabolism. 21(5), pp. 398 - 409. https://doi.org/10.1123/ijsnem.21.5.398
AuthorsBetts, James A., Beelen, Milou, Stokes, Keith A., Saris, Wim H. M. and van Loon, Luc J.C.
Abstract

Nocturnal endocrine responses to exercise performed in the evening and the potential role of nutrition are poorly understood. To gain novel insight, 10 healthy men ingested carbohydrate with (C+P) and without (C) protein in a randomized order and double-blind manner during 2 hr of interval cycling followed by resistancetype exercise and into early postexercise recovery. Blood samples were obtained hourly throughout 9 hr of postexercise overnight recovery for analysis of key hormones. Muscle samples were taken from the vastus lateralis before and after exercise and then again the next morning (7 a.m.) to calculate mixed-muscle protein fractional synthetic rate (FSR). Overnight plasma hormone concentrations were converted into overall responses (expressed as area under the concentration curve) and did not differ between treatments for either growth hormone (1,464 ± 257 vs. 1,432 ± 164 pg/ml · 540 min) or total testosterone (18.3 ± 1.2 vs. 17.9 ± 1.2 nmol/L · 540 min, C and C+P, respectively). In contrast, the overnight cortisol response was higher with C+P (102 ± 11 nmol/L · 540 min) than with C (81 ± 8 nmol/L · 540 min; p = .02). Mixed-muscle FSR did not differ between C and C+P during overnight recovery (0.062% ± 0.006% and 0.062% ± 0.009%/hr, respectively) and correlated significantly with the plasma total testosterone response (r = .7, p < .01). No correlations with FSR were apparent for the response of growth hormone (r = –.2, p = .4), cortisol (r = .1, p = .6), or the ratio of testosterone to cortisol (r = .2, p = .5). In conclusion, protein ingestion during and shortly after

Keywordscarbohydrate; growth hormone; cortisol; testosterone
Year2011
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Journal citation21 (5), pp. 398 - 409
PublisherHuman Kinetics, Inc.
ISSN1526-484X
Digital Object Identifier (DOI)https://doi.org/10.1123/ijsnem.21.5.398
Scopus EID2-s2.0-80053328580
Page range398 - 409
Research GroupMary MacKillop Institute for Health Research
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File Access Level
Controlled
Place of publicationUnited States
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