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Creatine supplementation alters the hormonal response to resistance exercise

Rahman Rahimi ; Department of Physical Education & Sport Science, Islamic Azad University, Branch of Mahabad, Mahabad, Iran
Hassan Faraji ; Department of Physical Education & Sport Science, Azad University, Branch of Marivan, Marivan, Iran
Dariush Sheikholeslami Vatani ; Department of Physical Education & Sport Science, University of Kurdistan, Sanandaj, Iran
Mohammad Qaderi ; Department of Physical Education & Sport Science, Islamic Azad University, Branch of Mahabad, Mahabad, Iran


Puni tekst: engleski pdf 248 Kb

str. 28-35

preuzimanja: 246

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Sažetak

The purpose of this study was to determine the influence of short-term creatine supplementation on hormonal responses to resistance exercise. 27 trained men were randomly divided into a creatine supplementation group [the CR group (n=15), taking 4×5 g creatine monohydrate/day] or a placebo supplementation group [the PL group (n=12), taking 4×7.5 g maltodextrin/day]. A double-blind research design was employed for a 7-day supplementation period. After this period, the participants performed exercise testing. Blood tests occurred on day 1 prior to supplementation loading (1Pre) and after this period [on the exercise testing day: pre-exercise (Pre), immediately post-exercise (IP), and 15 (15P) and 30 (30P) minutes post-exercise] for the measurement of the serum growth hormone and testosterone concentrations. Significant differences in the number of repetitions and volume were seen with CR (7.2±1.3 repetitions, 1560±386 kg) compared to PL (5.6±2 repetitions, 1089±341 kg) at set 5 of the exercise protocol (p=.01). Serum growth hormone and testosterone were significantly higher at 15P in CR (6.1±1.8 ng/ml, 70.1±19 pmol/L) compared to PL (4.1±1.7 ng/ml, 44.8±16 pmol/L) [(p=.02), (p=.01)]. The enhanced exercise performance resulted in a significantly greater increase in both the growth hormone and testosterone concentrations, indicating an augmented anabolic hormone response to creatine supplementation.

Ključne riječi

creatine loading, anabolic hormones, growth hormone, testosterone, exercise performance

Hrčak ID:

54239

URI

https://hrcak.srce.hr/54239

Podaci na drugim jezicima: hrvatski

Posjeta: 6.113 *