Source avec lien : Ergonomics, (En ligne). 10.1080/00140139.2022.2152113
À l’aide d’une seule chaise, configurable selon quatre modèles (contrôle, soutien lombaire, inclinaison de l’assise et soulagement scapulaire), nous avons étudié l’effet de la conception de la chaise sur la posture et le mouvement de la colonne vertébrale, l’activité musculaire et la douleur perçue dans un échantillon de 31 adultes asymptomatiques.
Chair design features are typically compared using multiple seats, which can lead to confounding effects. Using a single chair, configurable to four designs (control, lumbar support, seat pan tilt and scapular relief), we investigated the effect of chair design on spine posture and movement, muscle activity and perceived pain in a sample of 31 asymptomatic adults. A total of 39% of the population were classified as pain developers, having significantly higher peak pain levels across most body regions. The lumbar support and seat pan tilt condition resulted in more neutral spine and pelvic postures. Greater muscle activity was found in the seat pan condition and non-pain developers displayed lower spine muscle activation levels overall. Despite some improvements in spine posture, sitting-induced pain was present in the study sample at similar proportions to those reported previously. Future studies may consider investigating interventions targeted to sitting-induced pain developers as opposed to the general population. Practitioner summary: Four office chair configurations were tested. The lumbar support and seat pan tilt conditions resulted in the most neutral back posture but did not mitigate the clinically significant levels of sitting-induced pain experienced by a large portion of the tested sample. Future work should target interventions to these individuals.