title: Original Research: Effect of sprint and strength training on glucoregulatory hormones: Effect of advanced age.
abstract: 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-1vs. 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-1vs. 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.
authors.affiliation: Movement, Sport, Health and Sciences Laboratory (M2S). UFRAPS, University of Rennes, Rennes cedex 35044, France maha.sellami@gmail.com.
authors.forename: Maha
authors.initials: M
authors.lastname: Sellami
authors.affiliation: Tunisian Research Laboratory "Sport, Performance, Optimization", National Center of Medicine and Science in Sports, El Menzah 1004, Tunis, Tunisia.
authors.forename: Abderraouf
authors.initials: A
authors.lastname: Ben Abderrahman
authors.affiliation: Movement, Sport, Health and Sciences Laboratory (M2S). UFRAPS, University of Rennes, Rennes cedex 35044, France.
authors.forename: Wiem
authors.initials: W
authors.lastname: Kebsi
authors.affiliation: Laboratory of Medical Investigation, LIM-18, Medical School, University of Sao Paulo, 05508-000 São Paulo, SP, Brazil.
authors.forename: Maysa Vieira
authors.initials: MV
authors.lastname: De Sousa
authors.affiliation: Movement, Sport, Health and Sciences Laboratory (M2S). UFRAPS, University of Rennes, Rennes cedex 35044, France.
authors.forename: Hassane
authors.initials: H
authors.lastname: Zouhal
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology*; D001786:Blood Glucose / Q000032:analysis / Q000378:metabolism; D002395:Catecholamines / Q000097:blood*; D004837:Epinephrine / Q000097:blood*; D015444:Exercise / Q000502:physiology*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D007773:Lactates / Q000097:blood; D008297:Male; D055815:Young Adult
chemical_list: D001786:Blood Glucose; D002395:Catecholamines; D007328:Insulin; D007773:Lactates; D006854:Hydrocortisone; D004837:Epinephrine
keywords: Hypothalamic–pituitary–adrenal axis; Wingate-test; aging; catecholamine; cortisol; glucose metabolism