Effect of sprint and strength training on glucoregulatory hormones: Effect of advanced age
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Citações na Scopus
7
Tipo de produção
article
Data de publicação
2017
Título da Revista
ISSN da Revista
Título do Volume
Editora
SAGE PUBLICATIONS LTD
Autores
Citação
EXPERIMENTAL BIOLOGY AND MEDICINE, v.242, n.1, p.113-123, 2017
Resumo
The aim of this study was to examine the effect of high-intensity sprint and strength training (HISST) on glucoregulatory hormones in young (20 years) and middle-aged (40 years) men. Thirty-six moderately trained men participated as volunteers in this study. After medical examination, eligible subjects were randomly assigned to one of four groups according to their age: a young training group (21.3 +/- 1.3 yrs, YT, n = 9), a young control group (21.4 +/- 1.7 yrs, YC, n = 9), a middle-aged training group (40.7 +/- 1.8 yrs, AT, n = 9), and a middle-aged control group (40.5 +/- 1.8 yrs, AC, n = 9). YT and AT participated in HISST for 13 weeks. Before and after HISST, all participants performed the Wingate Anaerobic Test (WAnT). Blood samples were collected at rest, after warm-up (50% VO2max), immediately post-WAnT, and 10 min post-WAnT. Before HISST, we observed significantly higher (P < 0.05) glucose concentrations in AT (5.86 +/- 0.32 mmol. L-1) compared to YT (4.24 +/- 0.79 mmol. L-1) at rest, and in response to WAnT (6.56 +/- 0.63 mmol. L-1 vs. 5.33 +/- 0.81 mmol. L-1). Cortisol levels were significantly higher (P< 0.05) in AT than in YT in response to WAnT (468 +/- 99.50 ng. mL(-1) vs. 382 +/- 64.34 ng. mL(-1)). Catecholamine levels measured at rest and in response to WAnT rose in a similar fashion. After HISST, this ""age effect'' disappeared at rest and in response to exercise in the trained groups (YT and AT). Changes in hormone concentrations with intense training are due to adaptive changes in various tissues, especially in the skeletal muscle and liver in trained subjects. HISST may, at least in part, counteract the negative ""age effect'' on glucose metabolism.
Palavras-chave
Hypothalamic-pituitary-adrenal axis, catecholamine, glucose metabolism, cortisol, Wingate-test, aging
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