Ergonomic risk factors for the wrists of hairdressers.

This study utilized a portable data logger to measure the wrist angles and forearm flexor and extensor electromyography (EMG) of 21 hairstylists. The hairstylists were divided into two groups, one with 11 barbers (9 males and 2 females) specializing in men's hairdressing, and one with 10 hairdressers (2 males and 8 females) specializing in women's hairdressing. The standard haircut task was divided into three subtasks: hair cutting, washing and blow-drying. The mechanical exposures of the overall task and subtasks were quantified to compare how subtasks, occupational groups, and gender groups differ. Experimental results show that the average time to finish a woman's haircut (51.4min) is significantly longer than that for a man's haircut (35.6min) (p<0.005). Female hairstylists had significantly greater EMG activity than male hairstylists did (p<0.001). The non-dominant hands of hairdressers have significantly higher overall wrist velocity than those of barbers (p<0.005). Analytical results suggest that the relatively higher force exertion and wrist velocity of female hairstylists combined with prolonged exposure may account for the higher rate of hand/wrist pain in female hairdressers than in male barbers.

[1]  B Jonsson,et al.  Measurement and evaluation of local muscular strain in the shoulder during constrained work. , 1982, Journal of human ergology.

[2]  Pascal Madeleine,et al.  Physical workload during manual and mechanical deboning of poultry , 2002 .

[3]  Jacques Malchaire,et al.  Relationship between work constraints and the development of musculoskeletal disorders of the wrist: A prospective study , 1997 .

[4]  Gert-Åke Hansson,et al.  Upper extremity muscular load during machine milking , 2000 .

[5]  D. Chaffin,et al.  Carpal tunnel syndrome and selected personal attributes. , 1979, Journal of occupational medicine. : official publication of the Industrial Medical Association.

[6]  N. D. Weiss,et al.  Position of the wrist associated with the lowest carpal-tunnel pressure: implications for splint design. , 1995, The Journal of bone and joint surgery. American volume.

[7]  V Putz-Anderson,et al.  Prevalence and work-relatedness of self-reported carpal tunnel syndrome among U.S. workers: analysis of the Occupational Health Supplement data of 1988 National Health Interview Survey. , 1995, American journal of industrial medicine.

[8]  Å. Kilbom,et al.  Repetitive work of the upper extremity: Part II — The scientific basis (knowledge base) for the guide , 1994 .

[9]  M Hagberg,et al.  Occupational musculoskeletal stress and disorders of the neck and shoulder: a review of possible pathophysiology , 1984, International archives of occupational and environmental health.

[10]  Kaj Bo Veiersted,et al.  Effect of an intervention addressing working technique on the biomechanical load of the neck and shoulders among hairdressers. , 2008, Applied ergonomics.

[11]  R. Buschbacher.  Anatomical Guide for the Electromyographer: The Limbs and Trunk , 2007 .

[12]  Nina Nevala-Puranen,et al.  Changes in hairdressers' work techniques and physical capacity during rehabilitation , 1998 .

[13]  Stefan Pinzke,et al.  Highly repetitive work operations in a modern milking system. A case study of wrist positions and movements in a rotary system. , 2003, Annals of agricultural and environmental medicine : AAEM.

[14]  J Winkel,et al.  Guidelines for occupational musculoskeletal load as a basis for intervention: a critical review. , 1996, Applied ergonomics.

[15]  T Kuczek,et al.  Predictive models of carpal tunnel syndrome causation among VDT operators. , 1998, Ergonomics.

[16]  N. Fallentin,et al.  Assessment of work postures and movements using a video-based observation method and direct technical measurements. , 2001, Applied ergonomics.

[17]  K Ohlsson,et al.  Impact of physical exposure on neck and upper limb disorders in female workers. , 2000, Applied ergonomics.

[18]  S. Skerfving,et al.  Quantifying work load in neck, shoulders and wrists in female dentists , 1997, International archives of occupational and environmental health.

[19]  V Putz-Anderson,et al.  Back pain among workers in the United States: national estimates and workers at high risk. , 1995, American journal of industrial medicine.

[20]  W A Wallace,et al.  Relations between upper limb soft tissue disorders and repetitive movements at work. , 1995, American journal of industrial medicine.

[21]  Halonen,et al.  Occupationally Oriented Medical Rehabilitation and Hairdressers' Work Techniques--A one-and-a-half-year follow-up. , 1998, International journal of occupational safety and ergonomics : JOSE.

[22]  M. Stål,et al.  Wrist positions and movements as possible risk factors during machine milking. , 1999, Applied ergonomics.

[23]  K. Tuomi,et al.  Health reasons for leaving the profession as determined among Finnish hairdressers in 1980–1995 , 1999, International archives of occupational and environmental health.

[24]  Å. Kilbom,et al.  Repetitive work of the upper extremity: Part I—Guidelines for the practitioner , 1994 .

[25]  K Ohlsson,et al.  Goniometer measurement and computer analysis of wrist angles and movements applied to occupational repetitive work. , 1996, Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology.

[26]  Inger Arvidsson,et al.  Wrist movements among females in a repetitive, non-forceful work. , 2003, Applied ergonomics.

[27]  D Colombini,et al.  Guidelines for designing jobs featuring repetitive tasks. , 1998, Ergonomics.