The mechanisms by which tai chi can improve balance were investigated in a randomised controlled trial of 49 healthy older adults. The investigators found that that a widening of stance and improved use of vestibular input (sensory information from the inner ear which informs us how the body is moving in relationship to space and gravity) are two mechanisms by which tai chi may improve balance. (Effect of combined Taiji and Qigong training on balance mechanisms: a randomized controlled trial of older adults. Med Sci Monit. 2007 Aug;13(8):CR339-48).

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