Dabidi Roshan V, Babaei H, Hosseinzadeh M, Arendt-Nielsen L
College of Physical Education and Sport Science Department of Sport PhysiologyUniversity of Mazandaran, Babolsar, Mazandaran, Iran.
J Sports Med Phys Fitness. 2013 Jun;53(3):232-9.
We evaluated the effect of Creatine (Cr) supplementation on muscle fatigue and physiological indices after intermittent swimming bouts in trained swimmers. Sixteen healthy non-elite swimmers (19±4 years, 75±12 kg) were randomly assigned into two groups of either Cr supplementation or placebo and performed six repeated sprints swimming bouts of 50-m departing every 120 seconds. The Cr group was supplemented 4 times a day for 6 days. Blood lactate, Creatine Kinase (CK), creatinine, heart rate, best repeated sprint (RSb) and mean repeated sprint (RSm) times, and percentage of speed decrement (%Dec) were measured at the various phases of swimming bouts. Repeated measure ANOVA and independent t-student tests showed CK and blood lactate concentration increased gradually after the third and sixth swimming bouts. % Dec in Cr group was significantly lower after 3rd swimming bout, also heart rate in Cr group was associated with lower increase in HR mean (P<0.05) compared to placebo. These results suggest that Cr supplementation may improve swimming performance and reduce increased blood lactate levels following intermittent sprint swimming bouts. In conclusion Cr supplementation in trained swimmers may improve anaerobic performance and heart rate variations independent of the effect of intensive sprint swimming bouts.
我们评估了补充肌酸（Cr）对训练有素的游泳运动员间歇性游泳后肌肉疲劳和生理指标的影响。16名健康的非精英游泳运动员（19±4岁，75±12千克）被随机分为补充肌酸组或安慰剂组，并进行6组重复的50米冲刺游泳，每组间隔120秒。补充肌酸组每天补充4次，共6天。在游泳过程的不同阶段测量血乳酸、肌酸激酶（CK）、肌酐、心率、最佳重复冲刺（RSb）和平均重复冲刺（RSm）时间以及速度下降百分比（%Dec）。重复测量方差分析和独立t检验显示，在第三次和第六次游泳后，CK和血乳酸浓度逐渐升高。补充肌酸组在第三次游泳后%Dec显著降低，与安慰剂组相比，补充肌酸组的心率升高幅度也较低（P<0.05）。这些结果表明，补充肌酸可能会提高游泳成绩，并降低间歇性冲刺游泳后血乳酸水平的升高。总之，在训练有素的游泳运动员中补充肌酸可能会改善无氧运动表现和心率变化，而不受高强度冲刺游泳的影响。
