期刊
JOURNAL OF EXERCISE SCIENCE & FITNESS
卷 7, 期 2, 页码 91-97出版社
ELSEVIER SINGAPORE PTE LTD
DOI: 10.1016/S1728-869X(09)60011-3
关键词
caffeine; creatine kinase; exercise; leukocytosis; transaminases
This study examined the effect of caffeine supplementation on the white cell count and muscle damage marker responses to intermittent-interval exercise as performed by soccer players. Subjects (n = 20) completed a placebo-controlled double-blind test protocol. Forty-five minutes before exercise, participants ingested 4.5 mg . kg(-1) body mass of caffeine (EXP) or placebo (CONT). Blood samples were collected before and after exercise to measure hematological parameters, serum creatine kinase (CK), lactate dehydrogenase (LDH), alanine aminotransferase (ALT), asparrate aminotransferase (AST), alkaline phosphatase (AP) and gamma-glutamyl transferase (gamma-GT) activity. To compare differences among all variables, 2 (time) x 2 (group) repeated measures ANOVA (with Tukey's post hoc tests) was conducted. Exercise caused leukocytosis (38.5% and 36.1% in EXP and CONT, respectively), lymphocytosis (42.1% and 44.9%, p < 0.05) and neutrophilia (38.2% and 31.5%; p < 0.05) without an additional effect due to caffeine (p > 0.05). Also, serum CK and LDH activity were enhanced by exercise in both groups (p < 0.05), without a synergistic effect of caffeine. ALT, AST, AP and gamma-GT serum activity was not modulated by exercise or caffeine. The findings demonstrate that white cells and muscle damage markers increase after intense intermittent exercise, but acute caffeine supplementation has no influence on immune responses or muscle cellular integrity. [J Exerc Sci Fit Vol 7 No 2 91-97 2009]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据