ABSTRACT Winching is a common practice for extracting logs in forest operations; however, it requires significant physical effort by humans to pull-out the cable to the felling site. The aim of this study was to quantify the intensity of this activity by measuring human effort parameters during different winching operations under experimental conditions with a mini forestry crawler. Internal energy provision was determined by a portable spiroergometric device which was linked to beat-to-beat heart rate measurement. These data as well as the pulling force were assigned to the respective distance markers. After a small decrease over the first few meters, the pulling force increased as the pull-out distance increased. A maximum heart rate reserve of 67.3% and a metabolic equivalent (MET) of 11.6 were reached at the choking point in the flat winching direction. When winching was simulated uphill, peak values between 6.6 and 9.1 METs were reached at the end of the winching process. Winching with a remote-controlled mini forestry crawler over a distance of 50 m was rated as vigorous work, since METs of 6.0 for the entire work cycle were frequently exceeded. Thus, winching distances should be kept shorter in order to reduce metabolic strain. Moreover, winching teams should take active breaks and rotate work tasks during the working day to enable the necessary recovery.

中文翻译：

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肺量计在小型林业履带式电缆作业过程中工作代谢相关应变测定中的应用

摘要 绞车是森林作业中提取原木的常见做法；然而，将电缆拉出到砍伐地点需要人类付出大量的体力。本研究的目的是通过使用微型林业履带车在实验条件下测量不同绞车操作期间的人力参数来量化该活动的强度。内部能量供应由便携式肺活量测量设备确定，该设备与逐次心率测量相关联。这些数据以及拉力被分配给相应的距离标记。在前几米略有下降后，拉力随着拉出距离的增加而增加。最大心率储备为 67.3%，代谢当量 (MET) 为 11。在平绞方向的阻塞点处达到 6 个。当模拟上坡绞车时，在绞车过程结束时达到了 6.6 和 9.1 MET 之间的峰值。使用遥控微型林业履带车在 50 m 距离内进行绞盘被评为高强度工作，因为整个工作周期的 MET 经常超过 6.0。因此，绞车距离应保持较短，以减少代谢压力。此外，绞车团队应在工作日积极休息并轮换工作任务，以进行必要的恢复。0 在整个工作周期中经常被超过。因此，绞车距离应保持较短，以减少代谢压力。此外，绞车团队应在工作日积极休息并轮换工作任务，以进行必要的恢复。0 在整个工作周期中经常被超过。因此，绞车距离应保持较短，以减少代谢压力。此外，绞车团队应在工作日积极休息并轮换工作任务，以进行必要的恢复。