The effects of age on response time, accuracy, and shoulder/arm kinematics during hammering.

The aim of this study was to investigate the effects of age on response time and accuracy during a hammering task. Older male workers aged 51-69 years (older group: OG, n = 23) and younger male reference individuals aged 25-36 years (younger group: YG, n = 16) performed the experiment. Response time, accuracy, and 3D shoulder/arm kinematics were acquired using motion capture. The effects of age were investigated using linear mixed model analysis. Response times were significantly longer for OG compared with YG (P < 0.001) while no marked differences in the accuracy was observed (P = 0.729). OG showed less hammer displacement and smaller range of motion in the shoulder. Although older workers seemed to use a less biomechanical demanding motor strategy, their response times during hammering were about twice that of younger individuals.