Narotzki et al correctly point out that the 6-minute walk test (6MWT) can be used as an outcome measure for exercise training interventions. In a sample of 24 healthy older adults, they found that 30 minutes of daily moderate-intensity walking for 12 weeks improved 6MWT distance by 59 m among men and by 53 m among women. A change in walking distance of more than 50 m is thought to be clinically significant in most disease states.1
Beatty AL, Schiller NB, Whooley MA. Moderate Exercise for Improvement in 6-Minute Walk Test Performance in Stable Coronary Heart Disease—Reply. JAMA Intern Med. 2013;173(2):168–169. doi:10.1001/jamainternmed.2013.1710
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