The awkward movements and postures associated with childcare activities can lead to musculoskeletal symptoms in the neck and\nshoulders. ââ?¬Å?Dakkoââ?¬Â is a method for carrying a child in Japan, and recently it has been reported to cause shoulder stiffness. To our\nknowledge, the relationship between childcare activities and the physical load on the neck and shoulders is poorly understood.The\npresent study aims to clarify the muscle load on the neck and shoulder region through dakko simulations. First, the association\nbetween dakko movements and trapezius muscle activity is clarified by image and electromyogram analyses. Based on this\nclarification, the distributions and intensity of the muscle load from repetitive dakko movements are clarified using myogenic\npotential topography. During dakko movements, trapeziusmuscle activity was observed when lifting up and setting down the child,\nbut not when holding the child. For the repetitive movements,myogenic electrical potentials were observed in the trapezius region\nafter movement load, and individual characteristics of participants were revealed in both the load distributions and the recovery\nprocess. Repetitive dakko movements likely induced sustained muscle tonus in the trapezius, which may be a factor related to\nshoulder stiffness.
Loading....