Hickner R C, Horswill C A, Welker J M, Scott J, Roemmich J N, Costill D L
Ball State University, Muncie, IN.
Int J Sports Med. 1991 Dec;12(6):557-62. doi: 10.1055/s-2007-1024733.
This study was conducted to develop a testing protocol which would determine the extent of upper-body power output decrements in subjects following weight loss. Five athletes who had trained via upper-body exercise performed a 6-minute variable intensity arm crank test on an isokinetic ergometer before and after a 3-day, 4.5% body weight loss. Blood samples were drawn from a forearm vein pre- and 1, 3, and 5 min post-arm cranking for assessment of lactate, pH, hemoglobin, and hematocrit. The work performed pre-weight loss was significantly (paired t-test, p less than 0.05) greater than that performed post-weight loss. Repeated measures ANOVA yielded no significant differences in blood variables; however, pre-weight loss lactate values were higher and hemoglobin, hematocrit, and pH values were lower than post-weight loss values. It was concluded that a 4.5% body weight reduction resulted in performance decrements during this arm crank test. Survey information obtained from collegiate wrestlers (n = 14) subsequently tested under this protocol indicates the physical demands of this test approximate the physical demands of actual wrestling competition. It would therefore be appropriate to use this protocol during future testing of wrestlers in weight loss studies.
本研究旨在制定一种测试方案，以确定体重减轻后受试者上半身功率输出下降的程度。五名通过上肢运动进行训练的运动员在经历为期3天、体重减轻4.5%之前和之后，在等动测力计上进行了6分钟的可变强度手臂曲柄测试。在手臂曲柄测试前以及测试后1、3和5分钟，从前臂静脉采集血样，以评估乳酸、pH值、血红蛋白和血细胞比容。体重减轻前完成的工作量显著（配对t检验，p小于0.05）大于体重减轻后完成的工作量。重复测量方差分析显示血液变量无显著差异；然而，体重减轻前的乳酸值较高，而血红蛋白、血细胞比容和pH值低于体重减轻后的数值。得出的结论是，体重减轻4.5%导致在该手臂曲柄测试期间表现下降。随后根据该方案对大学摔跤运动员（n = 14）进行测试所获得的调查信息表明，该测试的身体需求近似于实际摔跤比赛的身体需求。因此，在未来摔跤运动员减肥研究的测试中使用该方案是合适的。
