Maximum daily 6 minutes of activity: An index of functional capacity derived from actigraphy and its application to older adults with heart failure

  • Howell J
  • Strong B
  • Weisenberg J
 et al. 
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OBJECTIVES To compare the correlation between the maximum 6 minutes of daily activity (M6min) and standard measures of functional capacity in older adults with heart failure (HF) with that in younger subjects and its prognostic utility. DESIGN Prospective, cohort study. SETTING Tertiary care, academic HF center. PARTICIPANTS Sixty, ambulatory, adults, New York Heart Association (NYHA) Class I to III, stratified into young (50.9 +/- 9.4) and older cohorts (76.8 +/- 8.0). MEASUREMENTS Correlation between M6min and measures of functional capacity (6-minute walk test; 6MWT) and peak oxygen consumption (VO(2)) according to cardiopulmonary exercise testing in a subset of subjects. Survival analysis was employed to evaluate the association between M6min and adverse events. RESULTS Adherence to actigraphy was high (90%) and did not differ according to age. The correlation between M6min and 6MWT was higher in subjects aged 65 and older than in those younger than 65 (correlation coefficient (r=0.702, P

Author-supplied keywords

  • Actigraphy
  • Functional capacity
  • Heart failure

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  • Jason Howell

  • B. Michelle Strong

  • Jenny Weisenberg

  • Anagha Kakade

  • Qian Gao

  • Paul Cuddihy

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