Repetitive Strain Injury is an umbrella term for pain and damage in muscles, nerves, and tendons caused by repetitive movements and sustained postures. RSI encompasses conditions including carpal tunnel syndrome, tennis elbow, and trigger finger, and is one of the most common occupational health problems globally.
How RSI Develops
RSI develops when repeated movements or static postures cause cumulative microtrauma to soft tissues faster than the body can repair them. The process is gradual: tendons develop microscopic tears, nerve pathways become compressed by inflamed tissues, and muscles held in sustained contraction develop trigger points. OSHA identifies six primary risk factors for RSI: repetition, force, awkward postures, static postures, vibration, and contact stress. Computer work combines several of these — repetitive keystrokes and mouse clicks, sustained static postures, and awkward wrist angles. The insidious nature of RSI is that symptoms begin mildly and are easy to dismiss. By the time pain becomes persistent, significant tissue damage may have occurred. Early intervention dramatically improves outcomes.
Evidence-Based RSI Prevention
NIOSH research found that supplementary rest breaks reduced upper body discomfort among computer workers without decreasing productivity. OSHA recommends micro-pauses every 10 minutes and longer breaks every hour for intensive repetitive work. Ergonomic workspace setup — neutral wrist position, appropriate chair height, monitor at eye level — reduces baseline strain. Stretching during breaks maintains tendon flexibility and promotes blood flow to stressed tissues. Varying your tasks throughout the day distributes the load across different muscle groups. The HSE identifies regular breaks and workstation assessment as the primary regulatory requirements for DSE users. OptiBreak enforces the break schedule component automatically, ensuring your hands, wrists, and arms get regular recovery time regardless of how absorbed you are in your work.
Related Terms
Carpal Tunnel Syndrome — compression of the median nerve in the wrist, the most well-known form of RSI. Ergonomics — the science of designing workspaces to minimise injury risk. Trigger Finger — inflammation of the flexor tendon sheath causing catching or locking of a finger. Cubital Tunnel Syndrome — compression of the ulnar nerve at the elbow, common among workers who rest elbows on hard surfaces. Mouse Elbow — colloquial term for lateral epicondylitis caused by sustained mouse use. Muscular Fatigue — the decline in muscle force output from sustained or repetitive use.
