Hairdressers’ shoulder load when blow-drying – Studying the effect of a new blow dryer design on arm inclination angle and muscle pain

TY - JOUR

T1 - Hairdressers’ shoulder load when blow-drying – Studying the effect of a new blow dryer design on arm inclination angle and muscle pain

AU - Wærsted, Morten

AU - Enquist, Henrik

AU - Veiersted, Kaj Bo

PY - 2019

Y1 - 2019

N2 - During nine months, nineteen hairdressers every second/third month switched the use between a blow dryer with traditional design and one with a new design. The new blow dryer had the possibility to change between two opposite directed air flows. Every second/third month arm inclination angle and upper trapezius muscle activity were measured a whole workday, and during blow-drying in the laboratory. Pronounced upper arm elevation was reduced with the new blow dryer. The muscle activity of the upper trapezius was only reduced in the laboratory, and daily pain reports were not significantly influenced at all. The subjective rating of time use, functionality and heaviness was less favourable for the new blow dryer, with only three out of nineteen preferring the new dryer at the end of the study period. However, the design of the new dryer demanded a change of work technique that might have been conceived as problematic by the experienced hairdressers. Relevance to industry: We studied a new professional handheld blow dryer designed to allow less postures with elevated arms, addressing an import risk factor for work-related musculoskeletal problems. Hairdressers using this new dryer had less time with upper arm in pronounced elevation during blow-drying.

AB - During nine months, nineteen hairdressers every second/third month switched the use between a blow dryer with traditional design and one with a new design. The new blow dryer had the possibility to change between two opposite directed air flows. Every second/third month arm inclination angle and upper trapezius muscle activity were measured a whole workday, and during blow-drying in the laboratory. Pronounced upper arm elevation was reduced with the new blow dryer. The muscle activity of the upper trapezius was only reduced in the laboratory, and daily pain reports were not significantly influenced at all. The subjective rating of time use, functionality and heaviness was less favourable for the new blow dryer, with only three out of nineteen preferring the new dryer at the end of the study period. However, the design of the new dryer demanded a change of work technique that might have been conceived as problematic by the experienced hairdressers. Relevance to industry: We studied a new professional handheld blow dryer designed to allow less postures with elevated arms, addressing an import risk factor for work-related musculoskeletal problems. Hairdressers using this new dryer had less time with upper arm in pronounced elevation during blow-drying.

KW - Arm elevation

KW - Blow dryer design

KW - Ergonomic intervention

KW - Hairdresser

U2 - 10.1016/j.ergon.2019.102839

DO - 10.1016/j.ergon.2019.102839

M3 - Article

AN - SCOPUS:85072173931

VL - 74

JO - International Journal of Industrial Ergonomics

JF - International Journal of Industrial Ergonomics

SN - 0169-8141

M1 - 102839

ER -