Pushing and pulling, technique and load effects: An electromyographical study

摘要: OBJECTIVE: Increasing awareness of the high physical cost associated with lifting has led to redesign these tasks, incorporating manual handling devices and consequently pushing pulling. Little research focused on muscle activity responses pulling, current study therefore investigated further understanding risk injury, informing ergonomics intervention strategies. METHODS: A laboratory was undertaken determine effect three push/pull techniques two loads (250 500 kg) activation in nine muscles, distributed through upper lower body. Unloaded forward backward walking were used as control conditions for limb activation. PARTICIPANTS: Thirty-six healthy male volunteers participated study. Subjects required manoeuvre a loaded pallet jack at velocity 0.45-0.55 statures. RESULTS: The muscles shoulders extremity affected greater degree by technique load changes than those limbs. Further, levels erector spinae recorded across all six experimental conditions. CONCLUSIONS: Each displayed unique profile, indicating that alternating between may reduce early onset fatigue. Further during pulling is necessary.