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Int. J. Environ. Res. Public Health 2017, 14(5), 473; doi:10.3390/ijerph14050473

6MWT Performance and its Correlations with VO2 and Handgrip Strength in Home-Dwelling Mid-Aged and Older Chinese

School of Nursing, Medical College, Soochow University, Suzhou 215006, China
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Paul B. Tchounwou
Received: 9 January 2017 / Revised: 8 April 2017 / Accepted: 26 April 2017 / Published: 29 April 2017
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Abstract

Six-minute walk test (6MWT) performance is more commonly used in clinic patients with chronic cardiopulmonary diseases but not in home-dwelling individuals of similar age, and its correlations with oxygen uptake (VO2) and muscle strength require further investigation. The current study determined the 6MWT performance of 106 home-dwelling residents (mean age of 62 years) in Suzhou, China. VO2 at a respiratory exchange ratio (R) of 1 was measured through graded cycling exercise tests on 46 participants. Handgrip strength of all participants was tested. 6MWT distance measured 543.4 ± 67.2 m (total work 351.0 ± 62.8 kJ) with similar distances ambulated each minute. Heart rate, blood pressure, and rate of perceived exertion scores significantly increased after 6MWT. VO2 at R = 1 reached 1238 ± 342 mL/min (18.6 ± 4.7 mL/kg/min), whereas handgrip strength totaled 29.8 ± 9.6 kg. 6MWT distance showed strong correlations with VO2 (r = 0.549, p ≤ 0.001) and handgrip strength (r = 0.359, p < 0.001). Aside from providing reference values for 6MWT performance (~543 m, ~559 m in males and ~533 in females) for home-dwelling Chinese residents, our results suggest that as a parameter of exercise endurance, 6MWT performance correlates with both aerobic capacity and muscle fitness. View Full-Text
Keywords: walking distance; muscle strength; graded exercise test; VO2; respiratory exchange ratio walking distance; muscle strength; graded exercise test; VO2; respiratory exchange ratio
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Zhang, Q.; Lu, H.; Pan, S.; Lin, Y.; Zhou, K.; Wang, L. 6MWT Performance and its Correlations with VO2 and Handgrip Strength in Home-Dwelling Mid-Aged and Older Chinese. Int. J. Environ. Res. Public Health 2017, 14, 473.

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