Kutz Matthew R, Gunter Michael J
Department of Physical Education and Athletic Training, Palm Beach Atlantic University, West Palm Beach, Florida 33416, USA.
J Strength Cond Res. 2003 Nov;17(4):817-21. doi: 10.1519/1533-4287(2003)017<0817:cmsobw>2.0.co;2.
Seventeen active males (age 22.9 +/- 4.9 year) participated in a study to examine the effects of creatine monohydrate supplementation on total body weight (TBW), percent body fat, body water content, and caloric intake. The TBW was measured in kilograms, percent body fat by hydrostatic weighing, body water content via bioelectrical impedance, and caloric intake by daily food log. Subjects were paired and assigned to a creatine or placebo group with a double-blind research design. Supplementation was given for 4 weeks (30 g a day for the initial 2 weeks and 15 g a day for the final 2 weeks). Subjects reported 2 days a week for supervised strength training of the lower extremity. Significant increases before and after the study were found in TBW (90.42 +/- 14.74 to 92.12 +/- 15.19 kg) and body water content (53.77 +/- 1.75 to 57.15 +/- 2.01 L) for the creatine group (p = 0.05). No significant changes were found in percent body fat or daily caloric intake in the creatine group. No significant changes were noted for the placebo group. These findings support previous research that creatine supplementation increases TBW. Mean percent body fat and caloric intake was not affected by creatine supplementation. Therefore weight gain in lieu of creatine supplementation may in part be due to water retention.
17名活跃男性（年龄22.9±4.9岁）参与了一项研究，以检验补充一水肌酸对总体重（TBW）、体脂百分比、身体水分含量和热量摄入的影响。总体重用千克测量，体脂百分比通过水下称重法测量，身体水分含量通过生物电阻抗法测量，热量摄入通过每日饮食记录测量。受试者配对并采用双盲研究设计被分配到肌酸组或安慰剂组。补充期为4周（最初2周每天30克，最后2周每天15克）。受试者每周报告2天进行下肢的监督力量训练。肌酸组在研究前后总体重（从90.42±14.74千克增加到92.12±15.19千克）和身体水分含量（从53.77±1.75升增加到57.15±2.01升）有显著增加（p=0.05）。肌酸组的体脂百分比或每日热量摄入没有显著变化。安慰剂组没有显著变化。这些发现支持了先前的研究，即补充肌酸会增加总体重。补充肌酸不影响平均体脂百分比和热量摄入。因此，补充肌酸导致的体重增加可能部分归因于水分潴留。
