Which of the following is an ergonomic risk factor?

• A. Noise exposure
• B. Temperature extremes
• C. Repetitive motions
• D. Awkward postures

Answer: (C)

Repetitive motions become an ergonomic risk factor because repeating the same movement places repeated, low-level stress on muscles, tendons, and nerves. Over time this can cause cumulative microtrauma and overuse injuries such as tendinopathies or carpal tunnel, especially when cycles are fast, long in duration, or paired with forceful grips and limited recovery. This risk grows with the repetition rate and duration, not just with posture, so tasks that require many repeated actions are a classic source of ergonomic problems. To lessen the risk, redesign the job to reduce repetition, vary motions, insert microbreaks, or use automation or assistance that minimizes repetitive loading, while keeping the wrists and arms in neutral positions as much as possible.