Office Chair with Long Backrest

Back pain from sitting in an office chair for a long time is mainly related to muscle strain, spinal mechanical imbalance, and blood circulation disorders caused by prolonged sitting. Discomfort usually occurs after sitting continuously for more than 30 minutes.

1. Muscle Strain and Tension
   When maintaining the same sitting posture for a long time, the back muscles (such as the erector spinae and trapezius) need to contract continuously to maintain body stability, leading to local lactic acid buildup. People who lack exercise or office workers with poor muscle endurance are more prone to soreness. For example, long-term tension in the erector spinae can cause referred pain from the waist to the neck, while tension in the trapezius may lead to soreness in the scapular region.

2. Spinal Mechanical Imbalance
   In a normal sitting posture, the lumbar spine should maintain a natural lordosis to distribute pressure. However, during prolonged sitting, people tend to adopt a "slouched" or "hunched" posture, causing the lumbar lordosis to disappear and increasing pressure on the intervertebral discs. At the same time, a straightened cervical spine curvature can cause compensatory tension in the neck muscles, further aggravating back pain. If this mechanical imbalance persists for a long time, it may induce structural problems such as intervertebral disc herniation or scoliosis.

3. Blood Circulation Disorders
   When sitting for a long time, the blood vessels in the back are compressed, reducing local blood flow and causing muscle tissue hypoxia. Metabolic wastes (such as carbon dioxide and lactic acid) cannot be excreted in a timely manner, stimulating nerve endings and causing a sore feeling. In addition, poor blood circulation also reduces the efficiency of muscle absorption of nutrients, creating a vicious cycle and exacerbating pain symptoms.

Improvement Suggestions:

• Regular Movement: Get up every 30-45 minutes for a 5-minute stretch or walk to promote blood circulation.
• Adjust Sitting Posture: Keep the waist naturally against the chair back and place a cushion at the waist to support the lumbar lordosis.
• Strengthen Exercise: Perform daily exercises such as the "Superman" (lifting the head and legs while lying prone) and wall squats to strengthen the back muscles.
• Professional Intervention: If the pain persists or is accompanied by symptoms such as arm numbness or lower limb weakness, consult a rehabilitation doctor promptly to develop a personalized training or treatment plan.