Effects of creatine loading on muscular strength and endurance of female softball players
Abstract
AIM: The purpose of this study was to determine the effects of Cr supplementation on muscle strength and endurance of the trained females, the effect of anaerobic exercises performed before the supplementation and disappearance of the effects on the performance.
METHODS: Twenty-six collegiate female softball players were divided into the Cr1, 2, Control (Cont.)1 or 2 group, randomly. They performed maximal 2-isometric and 30-isokinetic knee extensions at the angular velocities of 180 degrees and 60 degrees /s. Thereafter, the subjects of the Cr2 and Cont.2 groups performed resistance exercises with 10 RM and cycling with 0.01 kg x kg-1 body weight, alternately during the 1(st) week. During the 2(nd) week, the subjects of the Cr1 and 2 groups ingested 20 g Cr a day for 1 week. Thereafter, the subjects in the Cr2 group continued 3 g Cr ingestion a day for 2 weeks while the Cr1 group ingested the same amount of placebo during the 3(rd) and 4(th) weeks. The subjects of the Cont.1, 2 groups ingested the same amount and taste of placebo during the 1(st) to 4(th) weeks. This study was undergone in double blind fashion. The similar measurements, to which the subjects performed the 1(st) day, were carried out on the final day of the 2(nd), 3(rd) and 4(th) weeks.
RESULTS: Though maximal isometric strength did not differ in intra- and intergroups, the isokinetic peak torque in the Cr1 group was significantly decreased in the 4(th) measurement (p<0.01). The mean torque of the 1(st) to…
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Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 2 of 5 (High · randomized trial). Randomized trials of a reasonable size are the strongest single-study design.
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