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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...
A comparison of lumbar spine and muscle loading between male and female workers during box transfers
There is a clear relationship between lumbar spine loading and back musculoskeletal disorders in manual materials handling. The incidence of back disorders is greater in women than men, and for similar work demands females are functioning closer to their physiological limit. It is crucial to study loading on the spine musculoskeletal system with actual handlers, including females, to better understand the risk of back disorders. Extrapolation from biomechanical studies conducted on unexperienced subjects (mainly males) might not be applicable to actual female workers. For male workers, expertise...
Manual handling risks to midwives associated with birthing pools literature review and incident analysis
This report describes research into the manual handling related risks to midwives associated with providing care to women choosing to use a birthing pool for labour and/or birth at home and in hospital. The research comprised: a review of incidents reported to the Health and Safety Executive, a literature review and familiarisation visits to include discussions with midwives to identify current practices and procedures. The manual handling risks are likely to result from the position of the mother in the pool, as well as from the position of the midwife whilst undertaking tasks at the birthing...
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...
Difference between male and female workers lifting the same relative load when palletizing boxes
A few biomechanical studies have contrasted the work techniques of female and male workers during manual material handling (MMH). A recent study showed that female workers differed from males mostly in the strategy they used to lift 15-kg boxes from the ground, especially regarding task duration, knee and back postures and interjoint coordination. However, the lifting technique difference observed in females compared to males was perhaps due to a strength differences. The objective of this study was to test whether female workers would repeat the same lifting technique with a load adjusted to their...
Risk of neck musculoskeletal disorders among males and females in lifting exertions
Work-related neck disorders are common among various occupational groups. Despite clear epidemiological evidence for the association of these disorders with forceful arm exertions, the effect of such exertions on the biomechanical behavior of the neck muscles is currently not well understood. In this study, the effect of lifting tasks on the biomechanical loading of neck muscles was investigated for males and females. Twenty-six participants (13 males and 13 females) performed bi-manual isometric lifting tasks at knuckle, elbow, shoulder, and overhead heights by exerting 25%, 50%, and 75% of their...
Occupational lifting during pregnancy and risk of fetal death in a large national cohort study
Objective The aim of the present study was to examine the association between occupational lifting and the risk of fetal death according to gestational age. Methods We used data from the Danish National Birth Cohort (1996–2002). Among 71 500 occupationally active women, 2886 experienced a fetal death. Information on lifting and relevant covariates was collected in interviews around week 16 of pregnancy. The majority of fetal losses (N=2032) happened before the scheduled interview, and exposure data were collected retrospectively from these women. We analyzed early miscarriage (≤12 weeks...
Les femmes manutentionnaires - Un point de vue biomécanique et ergonomique
Les manutentionnaires encourent des risques très élevés de blessures au dos. Afin de trouver des solutions à ce problème chronique, l’IRSST subventionne une programmation de recherche sur la manutention. Un premier projet issu de cette programmation a comparé les méthodes de travail des manutentionnaires experts et novices masculins et a dégagé des principes de manutention qui serviront de guide à l’élaboration d’un programme de formation. Le présent projet se penchera sur l’étude...
Occupational lifting and pelvic pain during pregnancy
A study within the Danish National Birth Cohort Objectives : Pelvic pain during pregnancy is a common ailment, and the disease is a major cause of sickness absence during pregnancy. It is plausible that occupational lifting may be a risk factor of pelvic pain during pregnancy, but no previous studies have examined this specific exposure. The aim of this study was to examine the association between occupational lifting and pelvic pain during pregnancy. Methods : The study comprised 50 143 pregnant women, enrolled in the Danish National Birth Cohort in the period from 1996–2002. During pregnancy...

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