Studies suggest that pipetting for more than how many hours per year contributes to an increased risk of hand and shoulder ailments?

Research indicates that pipetting for more than 300 hours per year can significantly increase the risk of developing hand and shoulder ailments. This threshold is critical because prolonged repetitive motions, such as those involved in pipetting, can lead to cumulative trauma disorders due to the strain placed on muscles and tendons. It's essential to monitor and limit such repetitive tasks to maintain ergonomic health, especially in laboratory settings where pipetting is common. By understanding these risks, employers and employees can take preventative measures, such as implementing job rotation or ergonomic tools, to mitigate the potential for injury.