Sitting in an Office Chair is Very Tiring

Sitting in an office chair can be very tiring, mainly due to prolonged sitting, incorrect sitting posture, high mental stress, and unreasonable chair design. This can be alleviated through regular breaks, adjusting sitting posture, and increasing physical activity.

I. Cause Analysis

1. Prolonged Sitting: Continuous sitting can lead to muscle atrophy, decreased metabolic rate, and reduced blood flow, causing body hypoxia and increased fatigue. For example, individuals who sit for long periods may experience restricted blood circulation in their lower limbs, leading to heaviness and soreness.
2. Incorrect Sitting Posture: An incorrect sitting posture can increase the burden on muscles and joints. For instance, the intradiscal pressure in the lumbar spine is 1.8 times higher when sitting compared to standing, and exceeds 2.5 times when leaning forward. Prolonged pressure can cause deformation of the intervertebral disc's fibrous ring and herniation of the nucleus pulposus. The back muscles, due to continuous contraction, experience a blood flow reduction of over 60%, leading to lactic acid buildup, soreness, and spreading to the shoulder and neck regions.
3. Mental Stress: High stress can lead to endocrine imbalances, affecting metabolism and immune function, indirectly exacerbating physical fatigue. For example, under long-term high-pressure conditions, elevated cortisol levels in the body can cause muscle tension and rapid energy consumption.
4. Chair Design Flaws: Traditional ergonomic chairs that lack dynamic support or have insufficient fit cannot distribute body pressure effectively, leading to fatigue due to localized stress concentration. For example, when lumbar support is inadequate, sitting posture tends to lean forward, further increasing the burden on the lumbar spine.

II. Alleviation Methods

1. Regular Breaks: Take a 5-10 minute break every 45-60 minutes of work to stretch, walk around, or use a standing desk to promote blood circulation and relieve muscle stiffness.
2. Adjust Sitting Posture: Ensure both feet are flat on the ground, with knees and hips at a 90-degree angle, back straight, and shoulders relaxed. The height of the backrest should align with the L3 to L5 lumbar segments (20-25 cm), filling the lumbar depression. The seat depth should leave a three-finger gap between the thighs and the edge, with knees maintained at a 90-110-degree angle.
3. Increase Physical Activity: Engage in 30 minutes of aerobic exercise daily (such as brisk walking or swimming) to improve cardiopulmonary function and metabolic rate, enhancing muscle endurance.
4. Stress Reduction and Relaxation: Regulate mental state through meditation, yoga, or deep breathing to lower stress hormone levels and reduce physical fatigue.
5. Dynamic Sitting Posture: Use a balance ball chair or a rocking base chair that allows slight movement to activate the deep stabilizing muscles of the abdomen and lower back. Perform spinal realignment exercises every 20 minutes to inhibit fatigue.
6. Choose the Right Chair: Conduct a 'three-second test' before purchasing: sit down and ensure your lower back naturally fits against the backrest, and your shoulders can be raised along a straight line without shrugging. Chairs that meet these conditions are more suitable for long-term use.