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首页> 外文期刊>International Journal of Industrial Ergonomics >Asymmetric lifting; Maximum acceptable weight of lift; Heart rate; Oxygen uptake; Ratings of perceived exertion; Psychophysics
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Asymmetric lifting; Maximum acceptable weight of lift; Heart rate; Oxygen uptake; Ratings of perceived exertion; Psychophysics

机译：不对称提升;电梯的最大可接受重量;心率;摄氧量劳累程度心理物理学

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A laboratory experiment was conducted to determine the effects of asymmetric lifting on psychophysically determined maximum acceptable weight of lift (MAWL) and the resulting heart rate, oxygen uptake and rating of perceived exertion. Thirteen male college students were recruited as participants. Each participant performed 12 different lifting tasks involving three lifting frequencies (one-time maximum, 1 and 4 lifts/min) and four twisting angles (including the sagittal plane and three different angles of asymmetry, i.e., 0, 30, 60, and 90°) from the floor to a 76 cm high pallet for one hour's work shift using a free-style lifting technique. The results showed that: (1) The MAWLs were significantly lower for asymmetric lifting than for symmetric lifting in the sagittal plane. The MAWL decreased with an increase in the angle of asymmetry, however, the heart rate, oxygen uptake and RPE remained unchanged; (2) Lifting frequency had no significant effect on the percentage decrease in MAWL from the sagittal plane values. Correction factors of 4, 9, and 13% for MAWL at 0, 30, 60, and 90° of asymmetric lifting, respectively, are recommended; (3) Both the physiological costs (heart rate and oxygen uptake) and rating of perceived exertion increased with an increase in lifting frequency though maximum acceptable weight of lift decreased. The most stressed body parts were the lower back and the arm; and (4) The percentage decrease in MAWL with twisting angle for the Chinese participants was somewhat lower than those of the Occidental participants. In addition, even though there was a decrease in MAWL, heart rate and RPE increased with an increase in the angle of a symmetric lifting for the Occidental participants, it was different from that of the Chinese participants.
机译：进行了一项室内实验，以确定不对称举重对从心理上确定的最大举重重量（MAWL）以及由此产生的心率，摄氧量和感知劳累等级的影响。招募了13名男大学生作为参与者。每个参与者执行12种不同的举升任务，涉及三个举升频率（一次最大，一次和四个举升/分钟）和四个扭转角（包括矢状面和三个不同的不对称角，即0、30、60和90） °）从地板到76厘米高的托盘，使用自由式提升技术进行一小时的工作班次。结果表明：（1）在矢状面中，非对称提升的MAWL明显低于对称提升的MAWL。 MAWL随着不对称角度的增加而降低，但是，心率，摄氧量和RPE保持不变; （2）提升频率对矢状面值对MAWL百分比降低的影响不显着。建议分别在0、30、60和90°的非对称升力下将MAWL的校正系数设为4％，9％和13％。 （3）尽管最大可接受的举重下降，但生理成本（心率和摄氧量）和感知劳累的等级都随着举重频率的增加而增加。压力最大的身体部位是下背部和手臂。 （4）中国参加者的MAWL随扭角的下降百分比略低于西方参加者。此外，尽管西方参与者的MAWL降低，心率和RPE随对称举起角度的增加而增加，但与中国参与者不同。

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