Health and Exercise Science Research Laboratory, School of Applied Science, University of Glamorgan , Pontypridd, Wales.
J Sports Sci Med. 2006 Jul 1;5(CSSI):42-6. eCollection 2006.
The purpose of this study was to measure power values generated in elite karate fighters during brief high intensity cycle ergometry when resistive forces were derived from total - body mass (TBM) or fat - free mass (FFM). Male international karate practitioners volunteered as participants (n = 11). Body density was calculated using hydrostatic weighing procedures with fat mass ascertained from body density values. Participants were required to pedal maximally on a cycle ergometer (Monark 864) against randomly assigned loads ranging from 70 g·kg(-1) - 95 g·kg(-1) (using a TBM or FFM protocol) for 8 seconds. The resistive force that produced the highest peak power output (PPO) for each protocol was considered optimal. Differences (p < 0.05) in peak power outputs were found between the TBM and FFM experimental condition (1164 ± 137 W vs. 1289 ± 145 W respectively). Differences were also recorded (p < 0.01) between pedal velocity and applied resistive forces (127 ± 8 rpm vs. 142 ± 7 rpm; 6.6 ± 1 kg vs. 5.5 ± 1 kg, respectively). No differences (p > 0.05) were observed between time to PPO, or heart rate when the TBM and FFM protocols were compared. The findings of this study suggest that when high intensity cycle ergometer resistive forces are derived from FFM, greater peak powers can be obtained consistently in karate athletes. Resistive forces that relate to the active muscle tissue utilised during this type of exercise may need to be explored in preference to protocols that include both lean and fat masses. The findings have implications for both exercise prescription and the evaluation of experimental results concerning karate athletes. Key PointsMethods for quantifying and measuring high intensity performance using high intensity cycle ergometry have received considerable attention in recent years.The assumption has been that the relationship between total - body mass (TBM) and fat - free mass (FFM) is the same.However, variations in body composition between participants may under or over estimate cradle resistive forces used in high intensity cycle ergometry power assessment.This may lead to spurious calculations of power.The findings of this study demonstrate that the total capacity, power and relative contribution of the energy systems involved during experimental high intensity cycle ergometer exercise need re - evaluating.
这项研究的目的是测量在短暂的高强度循环测功中，当抵抗来自总体重（TBM）或去脂体重（FFM）时，精英空手道运动员产生的功率值。男性国际空手道从业者自愿作为参与者（n = 11）。使用静水称重程序计算体密度，从体密度值确定脂肪量。要求参与者在Monark 864 型测功机上最大程度地踩踏，抵抗随机分配的从 70 g·kg（-1）到 95 g·kg（-1）的负载（使用 TBM 或 FFM 协议），持续 8 秒。每个协议产生最高峰值功率输出（PPO）的阻力被认为是最佳的。在 TBM 和 FFM 实验条件下，峰值功率输出存在差异（p < 0.05）（分别为 1164 ± 137 W 和 1289 ± 145 W）。踏板速度和施加的阻力之间也记录到差异（p < 0.01）（分别为 127 ± 8 rpm 和 142 ± 7 rpm；6.6 ± 1 kg 和 5.5 ± 1 kg）。当比较 TBM 和 FFM 协议时，PPO 或心率之间没有差异（p > 0.05）。本研究的结果表明，当高强度测功机的阻力来自 FFM 时，空手道运动员可以持续获得更大的峰值功率。在这种类型的运动中，与使用的活跃肌肉组织相关的阻力可能需要探索，而不是包括瘦体重和脂肪质量的协议。这些发现对空手道运动员的运动处方和实验结果评估都有影响。关键点使用高强度测功机量化和测量高强度性能的方法近年来受到了广泛关注。假设是，总体重（TBM）和去脂体重（FFM）之间的关系是相同的。然而，参与者之间的身体成分差异可能会低估或高估高强度循环测功机功率评估中使用的摇篮阻力。这可能会导致功率的虚假计算。本研究的结果表明，需要重新评估实验性高强度循环测功机运动期间涉及的总容量、功率和能量系统的相对贡献。
