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Journal of Lifestyle Medicine


BACKGROUND: Understanding the cardiovascular and psychophysical demands of repetitive lifting tasks is important in job design strategies. This study determined the cardiovascular (oxygen consumption (VO) and heart rate (HR) and psychophysical response to repetitive lifting tasks in women. METHODS: Ten female (age 27 ± 5 yrs) participants transferred 11.4, 15.9, and 20.5 kg weights back and forth from a rung 40.6 cm high to a rung 156.2 cm high. Rungs were 195.6 cm apart horizontally. Three, 10 minute bouts (1 = 11.4 kg; 2 = 15.9 kg; 3 = 20.5 kg) were performed at 6 lifts per minute. Cardiovascular and psychophysical (rating of perceived exertion, RPE) parameters were monitored throughout the bouts. VOmax and HRmax were determined via a maximal treadmill test. RESULTS: VO, HR, and RPE were significantly different between each work bout (p < 0.01), with each outcome variable increasing as load increased. VOmax and HRmax equaled 46.5 ± 7.5 mL·kg·min and 191 ± 11 bpm, respectively. Work at 11.4 kg was performed at 38% VOmax and 63% HRmax; at 15.9 kg at 41% VOmax and 72% HRmax; and at 20.5 kg at 49% VOmax and 81% HRmax. RPE at 11.4, 15.9, and 20.5 kgs were: 8.4 ± 1.6, 11.4 ± 1.9, and 15.0 ± 2.2. CONCLUSION: During these repetitive lifting tasks, metabolic cost and perceived exertion increased with weight lifted; average work intensity ranged from 63 to 81% of HRmax and 38 to 49% of VOmax. Results have important implications in relation to job pacing and design, and worksite health promotion strategies aimed at reducing work place injury.


Published in Journal of Lifestyle Medicine by Yonsei University Wonju College of Medicine. Available via doi: 10.15280/jlm.2019.9.2.125.

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