Many studies have shown diminished blood and plasma levels of vitamin C in those who exercise. This suggests a need to increase intake if you exercise regularly. Studies that vitamin supplements from 300mg to 1000mg per day increased work capacity, reduced heart rates while exercising at a fixed intensity have also been demonstrated as have reduced body temperature and sweat loss during exercise.
Diminished Vitamin C levels in individuals who exercised or trained regularly also lead to reduced performance or aerobic and anaerobic exercises. It also increases the risk of susceptibility to upper respiratory tract infection particularly for those who do long duration activities such as cycling or running. Supplementing Vitamin C has shown to reduce infection in the next 48 hours after a training session.
