אימונים Plasma and salivary steroid hormone responses of men to high-intensity cycling and re

[Mike Bikov]

J Strength Cond Res. 2011 Jan;25(1):23-31.
Plasma and salivary steroid hormone responses of men to high-intensity cycling and resistance exercise.

Hough JP, Papacosta E, Wraith E, Gleeson M.

School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom.
Abstract

Hough, JP, Papacosta, E, Wraith, E, and Gleeson, M. Plasma and salivary steroid hormone responses of men to high-intensity cycling and resistance exercise. J Strength Cond Res 25(1): 23-31, 2011-Hormonal responses to exercise could be used as a marker of overreaching. A short exercise protocol that induces robust hormonal elevations in a normal trained state should be able to highlight hormonal changes during overreaching. This study compared plasma and salivary cortisol and testosterone responses to 4 exercise trials; these were (a) continuous cycle to fatigue at 75% peak power output (&U1E86;max) (FAT); (b) 30-minute cycle alternating 1-minute 60% and 1 minute 90% &U1E86;max (60/90); (c) 30-minute cycle alternating 1-minute 55% and 4-minute 80% &U1E86;max (55/80); and (d) Squatting 8 sets of 10 repetitions at 10 repetition maximum (RESIST). Blood and saliva samples were collected pre-exercise and at 0, 10, 20, 30, 40, 50, and 60 minute postexercise. Pre- to postexercise plasma cortisol increased in all exercise trials, except 60/90. Increases in 55/80 remained above pre-exercise levels for the entire postexercise period. Salivary cortisol increased from pre- to postexercise in FAT and 55/80 trials only. Once elevated after 55/80, it remained so for the postexercise period. Plasma testosterone increased from pre- to postexercise in all trials except 55/80. Saliva testosterone increased from pre- to postexercise in all trials with the longest elevation occurring after 55/80. Area under the curve analysis indicated that the exercise response of salivary hormones was greater in all cycle trials (cortisol) and in the 60/90 and 55/80 trials (testosterone) compared with the other trials. This study indicates that the 55/80 cycle protocol induces a prolonged salivary and plasma cortisol and salivary testosterone response compared with the other trials and so may be a useful diagnostic tool of overreaching.

PMID: 21157386 [PubMed - in process]​

🚬🤪🚬