Walking to meet physical activity guidelines in knee osteoarthritis: Is 10,000 steps enough?

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Abstract

OBJECTIVE: To study if step goals (e.g. walking 10,000 steps/day) approximate meeting 2008 Physical Activity Guidelines for Americans among adults with or at high risk of knee OA. DESIGN: Cross-sectional observational cohort SETTING: Community PARTICIPANTS: People with or at high risk of knee OA INTERVENTIONS: None MAIN OUTCOME MEASURES: Objective physical activity data were collected over 7 consecutive days from people with or at high risk of knee (OA) participating in the Multicenter Osteoarthritis Study. Using activity monitor data, we determined the proportion that 1) walked ≥10,000 steps/day, 2) met the 2008 Physical Activity Guidelines, and 3) achieved both recommendations. RESULTS: Of 1788 subjects studied (age 67 ± 8 yrs, BMI 31 ± 6 kg/m(2), 60% women), 16.7% of men and 12.6% of women walked ≥10,000 steps/day, while 6% of men and 5% of women met the 2008 Physical Activity Guidelines for Americans. Of those walking ≥10,000 steps/day, 16.7% and 26.7% of men and women also met the 2008 Physical Activity Guidelines. CONCLUSIONS: Among this sample of older adults with or at high risk of knee OA, walking ≥10,000 steps/day did not translate into meeting public health guidelines. These findings highlight the disparity between number of steps/day believed to be needed and recommended time-intensity guidelines to achieve positive health benefits.

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