Tai chi is as effective as a brisk walk in raising heart rate variability (HRV). A Korean crossover study recruited 24 volunteers between 24 and 35 years. Subjects either walked on a treadmill at six kilometres an hour (just under three miles per hour) or performed tai chi for 20 minutes daily, for a week. Mean heart rate was found to be similar for both forms of exercise and the HRV was also comparable. HRV is an important indicator of physiological resiliency, reflecting the capacity of the individual to adapt effectively to stress. (American Academy of Family Physicians Annual Scientific Assembly, October 2007).

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