Light intensity exercise: An investigation into potential effects on oxygen perfusion and metabolism as measured by momentary post-activity drops in blood oxygen saturation

Background Previous research suggests slower paces of walking, tai chi, qigong and other light intensity physical activities may develop states of relaxation which may trigger increased oxygen perfusion and metabolism. Methods A Nonin WristOx 3150 was used to record and graph blood oxygen saturation (SpO2) changes in 10 members of an older adult tai chi group during slow-paced walking, tai chi, and qigong. All participants noted a chronic condition. Measurements were compared to 10 participants from a fitness center group reporting good health. Results The tai chi group experienced a brief momentary post-activity drop in SpO2 before returning to normal levels ( P< .001), with mean of 90.20 ± 1.55% following slow-paced walking; 89.30 ± 1.70% following tai chi; and 88.40 ± 1.43% following qigong. No significant change was recorded in the fitness center group. Conclusion The brief large drop in SpO2 averaging 22.2 seconds following activities in the tai chi group may signal an adjustment and shift in oxygen use and metabolism. A metaerobic hypothesis is proposed as a potential explanation, suggesting that a relaxed state coupled with enhanced respiration may enhance oxygen perfusion and metabolism, potentially supporting healing and cellular regeneration. Avenues for further research are suggested, including comparison to aerobic exercise and stages of sleep.