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Sex Differences in Glenohumeral Muscle Activation and Coactivation During a Box Lifting Task
Manual material handling is associated with shoulder musculoskeletal disorders, especially for women. Sex differences in glenohumeral muscle activity may contribute to women's higher injury risk by affecting shoulder load and stability. We assessed the effects of sex (25 women vs 26 men) and lifting load (6 kg vs 12 kg) on muscle activation during box lifting from hip to eye level. Surface and intramuscular electromyography were recorded from 10 glenohumeral muscles. Most muscles were more activated for the heavier box and for women. These effects were larger for “prime...
Older females in the workforce
The effects of age on psychophysical estimates of maximum acceptable lifting loads This psychophysical study demonstrated that older female workers (aged 50–63 years) selected maximum acceptable lift masses that were (on average) 24% lower than younger workers (aged 20–32 years), which corresponded with lower grip strength and heart rate reserve. Current maximum acceptable lifting weights based on psychophysical information may not protect female workers greater than 50 years of age. Source: Chen, J. A., Dickerson, C. R., Wells, R. P., & Laing, A. C. (2017). Ergonomics , 1-34. http...

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