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. 2017 Apr 29;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

Qing Zhang  1 , Hailin Lu  2 , Shiqin Pan  3 , Yuan Lin  4 , Kun Zhou  5 , Li Wang  6
Affiliations

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

Qing Zhang et al. Int J Environ Res Public Health. .

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.

Keywords: VO2; graded exercise test; muscle strength; respiratory exchange ratio; walking distance.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Correlation between 6MWT distance and VO2 (A) or relative VO2 (B) at R = 1. R: respiratory exchange ratio.
Figure 2
Figure 2
Correlation between 6MWT distance and handgrip strength.
See this image and copyright information in PMC

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