| Autor: |
ZHAOJING CHEN, SHARMA-GHIMIRE, PRAGYA, XIN YE, DAEYEOL KIM, BEMBEN, MICHAEL, BEMBEN, DEBRA |
| Předmět: |
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| Zdroj: |
International Journal of Exercise Science; 2015, Vol. 8 Issue 1, p11-20, 10p, 1 Diagram, 4 Charts, 1 Graph |
| Abstrakt: |
Few studies have focused on the acute hormone responses to whole-body vibration (WBV) combined with resistance exercise. The purpose of this study was to compare the cortisol response to a single bout of WBV combined with resistance exercise (WBV + RE) and resistance exercise only (RE) in young men (n=9). This study used a cross-over repeated measures design. 1-RM testing was performed for four lower body and two upper body isotonic resistance exercises. Subjects performed the RE condition (80% 1-RM, three sets, 10 reps) and the WBV+RE condition (20 Hz, five one-minute bouts, one- minute rest between bouts) followed by RE in random order separated by two weeks to avoid a last bout effect. Fasting morning blood samples were obtained at baseline (PRE), immediately after exercise (IP), and 30 minutes after exercise (30P) to assess cortisol and lactate concentrations. The WBV + RE condition included a blood draw immediately after the vibration exposure (POSTVIB). There were no significant time, group, or interaction effects for cortisol concentrations. Also, there were no significant differences between conditions for absolute changes in cortisol. Cortisol did not change at POSTVIB. Blood lactate significantly (p<0.01) increased at IP for both conditions, but there was no difference between conditions. Lactate significantly (p<0.05) increased at POSTVIB (PRE 1.03 ± 0.15; POSTVIB 1.38 ± 0.15 mmol/L). In conclusion, acute cortisol responses were similar for whole-body vibration plus resistance exercise and resistance exercise only conditions. There was large variability in the cortisol responses to both exercise protocols. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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