장기간의 크레아틴 구강 투여와 웨이트 트레이닝이 체구성비의 변화에 미치는 영향 = The Effects of Long-Term Oral Creatine Supplementation and Weight Training on Body Composition

다국어 초록 (Multilingual Abstract)

The purpose of this study is to examine the effect of long-term oral creatine(Cr) supplementation of weight training on body composition.
In order to conduct this study, 10 physical education students in optimal physical condition were chosen. The test subjects were divided into 2 groups : Cr supplement group, non-Cr supplement group. In the first stage, the Cr supplement group receved 20g of Creatine monohydrate for the first 4 days, and 5g per day for 54 days, thereafter.
All exercise studies were conduced to variable resistance training for 1 hour, three times per week. The training involved seven different exercise, including leg press, bench press, leg curl, leg extension, squat, shoulder press, and sit-ups. Each exercise consisted of 5 set of 12 repetitions at 70% of one repetition maximum(IRM). The IRM values were determined before training and after 8 weeks of training.
1) In terms of body weight, there was no significant difference between the Cr supplementation condition and non-Cr supplementation condition (p>0.05). However, among the Cr supplementation condition, there was a noticeable increase in body weight than in non-Cr supplementation condition.
2) In body fat percentage, there was no significant difference between the Cr supplementation condition and non-Cr supplementation condition (p>0.05), but in the Cr supplementation condition, there was a markedly lower level of body fat percentage than in the non-Cr supplementation condition.
3) In body fat mass, there was no significant difference between the Cr supplementation condition and non-Cr supplementation condition(p>0.05). However, in the Cr supplementation condition, there was lower level of body fat mass than in the non-Cr supplementation condition.
4) In terms of lean body mass(LBM), there was no significant difference between the Cr supplementation condition and non-Cr supplementation condition(p>0.05), but in the Cr supplementation condition, there was higher level of LBM than in the non-Cr supplementation condition.
5) In the creatinine level, there was no significant difference between the Cr supplementation condition and non-Cr supplementation condition(p>0.05). However, in the Cr supplementation condition, there was higher level of creatinine and non-Cr supplementation condition.
6) In the 1RM, there was no significant difference between the Cr supplementation condition and non-Cr supplementation condition(p>0.05), but in the Cr supplementation condition, there was higher level of 1RM than in the non-Cr supplementation condition.
All these findings are in agreement with previous studies. Based on the results of this, we have found that Cr supplementation and 8weeks weight training decreased body fat, while increasing LBM and muscle mass.