Chair - Office Chair Slouch

Slouching in an office chair is an extremely harmful poor sitting posture, where a person half-lies and half-nestles in the chair with the lumbar spine hanging in the air and the neck protruding forward. The specific harms and improvement methods are as follows:

Harms to the Body

1. Spinal Injury: When slouching, the pelvis tilts backward, the back bends into a 'C' shape, and the natural lordosis of the lumbar spine is forcibly straightened. Over the long term, this can lead to scoliosis.
2. A Sharp Increase in Lumbar Disc Pressure: When slouching, the pressure on the lumbar intervertebral discs is 1.4 - 2 times that of standing and about 40% more than that of a normal sitting posture. This accelerates disc dehydration and degeneration and may even trigger lumbar disc herniation.
3. Muscle Imbalance and Strain: The deep stabilizing muscle groups stop working, while the superficial back muscles and ligaments are forced to remain tense for a long time, leading to muscle stiffness and chronic strain. The front muscles of the body are tight, and the back muscles are weak, which can easily result in the 'upper crossed syndrome' characterized by rounded shoulders and a hunched back.
4. Increased Burden on the Cervical Spine: When the head protrudes forward, the cervical spine becomes a lever with a heavy load at the front end. The neck and shoulder muscles are tense throughout, which can easily cause neck and shoulder pain, ligament hyperplasia, and even straightening of the cervical lordosis. When the head is lowered by 30 degrees, the neck muscles need to bear about 18 kilograms of tension.
5. Affected Internal Organ Functions: Slouching compresses the thoracic and abdominal cavities, affecting breathing depth and gastrointestinal peristalsis, leading to problems such as chest tightness and indigestion.

Improvement Methods

1. Use a Firm Lumbar Support: Place a supportive cushion or a rolled-up towel behind the waist, positioned right behind the navel, to fill the gap between the lumbar spine and the chair back and maintain the natural lordosis of the lumbar spine.
2. Sit Fully and Keep Feet on the Ground: Sit as far back as possible on the chair, with both feet flat on the ground and the knees slightly lower than the hips (or at an obtuse angle of 95° - 100°). Avoid crossing your legs and let the pelvis firmly support the upper body.
3. Raise the Line of Sight: Use books or stands to adjust the height of your phone or screen to eye level. Raise the computer screen to be level with or slightly lower than your line of sight to reduce the degree of head lowering and avoid neck protrusion.
4. Take Regular Breaks: Get up and move for 1 - 2 minutes every 30 - 40 minutes of sitting. Do waist rotations, chest expansions, and neck extensions. After sitting quietly for 40 minutes, get up and move for 5 - 10 minutes. You can try 'chair yoga' (such as slowly rotating your waist with your hands on your hips, standing and arching backward to stretch the thoracic spine) or standing against a wall (with the back of the head, shoulder blades, buttocks, and heels touching the wall) to restore blood supply to the back muscles.