利用心率和感知用力等级评估德里批发贸易市场手推车推车者的生理工作量。

Department of Design, Ergonomics Laboratory, Indian Institute of Information Technology Design and Manufacturing, Jabalpur, Madhya Pradesh, India.

Natl Med J India. 2023 Mar-Apr;36(2):89-92. doi: 10.25259/NMJI_855_20.

Background . Handling a heavy load on a handcart is common in the wholesale and retail trade markets in India and many parts of the globe. These carts transport goods between major markets, warehouses and transporters. We assessed the physiological workload among handcart pullers in terms of cardiovascular load (CVL), energy expenditure (EE), heart rate (HR), physiological cost of work and subjective rating of perceived exertion. Methods . Physiological workload was assessed with the help of HR during resting, working (15 minutes) and recovery state with a smart wearable device to extrapolate percentage of CVL, EE and physiological cost of work among handcart pullers. Subjective assessment of exertion was measured with the Borg 5-point rating scale among 35 cart pullers. Data were analysed using Microsoft Excel version 2010. Results . It was found that in handcart-pulling activity, EE was 11.706 kJ/minute, average working HR was 128 beats/minute and physiological cost of work was 89.09 beats/minute with no loads on handcart. This signifies that the activity falls under heavy physiological workload. The average percentage of CVL was found to be 50.5%, which falls under acceptable category for persons with a healthy cardiovascular system. Thirty-one (88.6%) of the participants reported the activity to be moderately heavy, whereas 4 (11.4%) participants mentioned it to be light. Conclusions . Handcart-pulling operation in this study without load on cart was found to be a heavy physiological workload. In real-time situations, the load, road conditions, long duration and traffic congestion is likely to result in a higher range of physiological workload on cart pullers.

背景

在印度和全球许多地区的批发和零售贸易市场，手推车搬运重物很常见。这些手推车在各大市场、仓库和运输商之间运输货物。我们评估了手推车搬运工的心血管负荷（CVL）、能量消耗（EE）、心率（HR）、生理工作成本和主观用力感知评估等生理工作负荷。方法：借助 HR，在休息、工作（15 分钟）和恢复状态下，使用智能可穿戴设备评估手推车搬运工的 CVL、EE 和生理工作成本的百分比。通过 Borg 5 点等级量表评估 35 名推车手的主观用力感知。使用 Microsoft Excel 版本 2010 对数据进行分析。结果：在手推车拉动活动中，EE 为 11.706 kJ/min，平均工作 HR 为 128 次/min，生理工作成本为 89.09 次/min，手推车无负载。这表明该活动属于重体力活动。平均 CVL 百分比为 50.5%，对于心血管系统健康的人来说属于可接受范围。31 名（88.6%）参与者报告该活动为中等强度，而 4 名（11.4%）参与者表示该活动为轻度。结论：本研究中，在手推车无负载的情况下，手推车操作被认为是一种重体力生理负荷。在实际情况下，负载、道路状况、长时间和交通拥堵可能会导致手推车搬运工的生理负荷范围更高。