Swimming and Arthritis: The Best Low-Impact Exercise Choice

Introduction

The prevalence of osteoarthritis in Taiwan continues to rise with an aging society. Many patients avoid exercise due to knee and hip pain, creating a vicious cycle of “the less you move, the faster you deteriorate.” Swimming, thanks to its unique aquatic environment, allows arthritis patients to perform effective exercise with almost no impact. This article explains the benefits of swimming for various types of arthritis and how to do it safely from a sports medicine perspective.

How Does Buoyancy Protect Joints?

Based on Archimedes’ principle, buoyancy in water counteracts part of the body’s weight. Research shows:

• Standing in waist-deep water: Joint loading is reduced by approximately 50%
• Standing in chest-deep water: Joint loading is reduced by approximately 70%
• Floating or swimming horizontally: Joint loading approaches 0

This means that patients with knee degeneration who cannot jog on land can still maintain the aerobic exercise goal of 150 minutes per week in the water.

Benefits of Swimming for Osteoarthritis (OA)

Osteoarthritis mainly affects the knee, hip, and hand joints, where gradual cartilage wear leads to pain and limited mobility. Multiple randomized controlled trials (RCTs) show that after 8–12 weeks of aquatic exercise intervention:

• Knee pain scores (VAS scale) decreased by an average of 30–40%
• 6-minute walk test distance significantly increased (functional improvement)
• Quadriceps muscle strength improved
• Quality of life scores (SF-36) improved

Swimming is equally effective as water walking and aqua aerobics, with the difference being that swimming provides more comprehensive upper-body strength training.

Precautions for Rheumatoid Arthritis (RA)

Rheumatoid arthritis is an autoimmune disease, and the degree of joint inflammation is more unpredictable than in OA.

Best Swimming Styles for Arthritis Patients

Recommended Strokes

• Backstroke: The spine is in an extended position with minimal knee and hip flexion angles, making it the most suitable for patients with knee degeneration.
• Freestyle (slow pace): Breathing rhythm can be adjusted to avoid excessive neck rotation.
• Kickboard leg kicks: Only the lower limbs move, and knee range of motion is controllable, making it suitable for beginners or post-acute-phase rehabilitation.
• Water walking (in the pool): The safest starting point; walk back and forth in waist-deep water for 20 minutes.

Strokes to Approach with Caution or Avoid

• Breaststroke kick (high varus/valgus stress on the knee; high risk of breaststroker’s knee)
• Vigorous wall turns (rapid twisting may irritate joints)
• Long-distance butterfly stroke (full-body undulating motion places significant load on the lumbar spine)

The Importance of Water Temperature

Most public pools in Taiwan have a water temperature of approximately 26–28°C, which is slightly cool for arthritis patients. It is recommended to choose gyms with warm-water pools, or opt for indoor heated pools in Taiwan during autumn and winter.

Practical Recommendations

• Warm up on land before entering the water: 10 minutes of light activity (joint circles, marching in place) to distribute joint fluid evenly and reduce initial discomfort upon entering the water.
• Exercise for 20–45 minutes per session: Start with 20 minutes and gradually increase based on tolerance, following the principle of “the day after swimming should not be more painful than before swimming.”
• Wear aquatic exercise shoes: If walking in the water, wear non-slip water shoes to protect the plantar fascia and ankle joints.
• Alternate cold and heat on joints after swimming: If a joint is noticeably swollen after swimming, apply an ice pack for 15 minutes; if it is only mildly stiff, warm compresses or a hot bath can help.
• Combine with land-based strength training: Although swimming can maintain muscle strength, the most fundamental way to protect the knees is to strengthen the quadriceps and gluteal muscles. Adding 2 sessions of land-based resistance training per week yields better results.

Conclusion

Arthritis is not a reason to stop exercising, but an opportunity to find the right exercise. Swimming provides the best platform for “moving effectively without harming the joints.” Every city and county in Taiwan has public swimming pools with affordable fees, available year-round. Rather than staying in bed and accelerating degeneration due to pain, put on a swimsuit and let the buoyancy of the water carry you forward.

Related Reading

• Swimming and Joint Protection: The Best Low-Impact Exercise Choice
• The Healing Benefits of Swimming for Arthritis Patients: The Medical Basis of Low-Impact Aquatic Exercise
• Swimming and Joint Protection: Swimming Recommendations for Patients with Degenerative Arthritis
• The Therapeutic Effects of Swimming on Arthritis: Rehabilitation Applications of Aquatic Resistance Training