(2018) The effect of changes in concentric-eccentric contraction time ratio on hormonal response to resistance exercise in trained men Effet du changement du ratio temps de contraction concentrique–excentrique sur la réponse hormonale à des exercices en résistance chez des hommes entraînés. Science and Sports.
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Abstract
Objectives: The aim of this study was to investigate the effect of changing concentric-eccentric contraction time ratio in a single session of resistance exercise on hormonal response in trained men. Methods: In a double-blind cross section study design, ten young men (mean age: 26.3 ± 1.2 years, mean weight: 81.2 ± 4.25 kg, and mean height: 178 ± 6 cm) were selected and completed 4 resistance exercise sessions with 3 days’ between sessions interval. Protocols included, 1 second concentric and 1 second eccentric contraction; 3 second concentric and 3 second eccentric contraction; 4 second concentric and 2 seconds eccentric contraction; 2 seconds concentric and 4 seconds eccentric contraction. In each session subjects performed one of the four protocols. The exercise protocol was consisted of leg extension, bench press, hamstring curls and lat pull-down with three sets of eight repetitions and intensity of 0.65 of one repetition maximum. Rest times for sets and exercises were 1 and 2 minutes respectively. Blood samples were collected before and immediately after exercise. Results: Increases in lactate were observed after all protocols. Serum levels of testosterone and growth hormone increased significantly in all, but 1 second concentric and 1 second eccentric contraction protocol, while level of serum cortisol did not change significantly in none of the protocols. Conclusions: The result of this study showed that in a single session of RE, changes in concentric-eccentric contraction time ratio had no effect on hormonal response, however slower contractions produced greater hormonal response compare to normal protocol. © 2018 Elsevier Masson SAS
Item Type: | Article |
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Keywords: | Cortisol; Growth hormone; Resistance training |
Page Range: | pp. 164-168 |
Journal or Publication Title: | Science and Sports |
Volume: | 33 |
Number: | 3 |
Publisher: | Elsevier Masson SAS |
Identification Number: | 10.1016/j.scispo.2017.11.004 |
ISSN: | 07651597 |
Depositing User: | مهندس جمال محمودپور |
URI: | http://eprints.muk.ac.ir/id/eprint/1847 |
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