In a similar way that rust attacks and damages bare metal, oxidative stress can contribute to sore muscles and stiff joints as well as to energy levels and endurance. For example, when we exercise, the body increases its use of oxygen. One of the byproducts of oxygen metabolism–free radicals–can do damage to muscle tissue which results in soreness and fatigue.
In addition, both osteoarthritis and rheumatoid arthritis have been linked to oxidative stress. Since all of these conditions–exercise induced muscle damage, osteoarthritis, and rheumatoid arthritis–possess both inflammatory and oxidative stress components, it would appear that taking a dietary supplement such as AstaFactor with antioxidant and anti-inflammatory properties should help reduce the pain associated with them. A recent study has shown that astaxanthin can significantly reduce joint pain and improve physical performance in people with rheumatoid arthritis. Another study has shown that astaxanthin can increase strength and endurance.