This experiment evaluates shoulder flexion and task frequency effects on upper-limb muscle activity and endurance time, suggesting implications for workplace safety.
Key Points
The research aims to assess how shoulder flexion angle and task repetition affect muscle activity and endurance during upper-limb tasks.
Seven healthy males participated in the experiment.
Participants performed tasks at four shoulder flexion angles and three repetition frequencies.
Surface electromyography measured muscle activity during the tasks.
A two-way ANOVA analyzed the effects of shoulder angle and task type.
Significant effects of shoulder angle and task type on muscle activity and endurance time were observed.
Muscle activity peaked during high-frequency tasks and at 180° shoulder flexion.
Increased muscle activity was more significant during high-frequency tasks compared to static tasks.