Wagenmakers, R., Ak-ker-Scheek, I., Groothoff, J.W., Zijlstra, W., Bulstra, S.K., Koot-stra, J.W.J., Wendel-Vos, G.C.W., van Raaij, J.J.A.M. and Stevens, M. (2008) Reliability and validity of the short questionnaire to assess health- enhancing physical activity (SQUASH) in patients after total hip arthroplasty. BMC Musculoskeletal Disorders, 9, 141. doi:10.1186/1471-2474-9-141

has been cited by the following article:

• TITLE: Physical activity in persons with Parkinson disease: A feasibility study

  AUTHORS: C. Allyson Jones, Marguerite Wieler, Jennifer Carvajal, Logan Lawrence, Robert Haennel

  KEYWORDS: Parkinson Disease; Physical Activity; Quality of Life; Exercise Test

  JOURNAL NAME: Health, Vol.4 No.11A, November 29, 2012

  ABSTRACT: Background: Physical activity for persons with Parkinson Disease (PD) is recommended yet little is known about the physical activity levels in this patient population. The primary aim was to assess the feasibility of using a direct measurement and self-report measure of physical activity in patients with PD. Methods: Physical activity was recorded in 11 out-patients with mild to moderate PD. An accelerometer based sensor system (SenseWear Pro Armband?) which was worn continuously over 2 days was used to measure physical activity. Minute by minute energy expenditure and steps per day were recorded. Self-report physical activity was measured using the Short QUestionnaire to ASsess Health-enhancing physical activity (SQUASH) which assessed average weekly activity. Results: Using the accelerometer based sensor system, 83% of the day was spent in sedentary activity with the majority active time spent at a light intensity (2.7 [SD 2.0] hrs/day). Self-reported mean number of hours for activities greater than 2.0 METs was 3.4 (SD 1.5) hrs/day. Although the overall time spent in activity did not differ between the accelerometer and SQUASH, partici- pants reported a higher proportion of activities at the moderate and vigorous intensities than the accelerometer recorded. Conclusions: Measurement of physical activity is a challenge in persons with PD given the disease-related symptoms. We found that, by all accounts, a self-report measure of physical activity should be complemented with a direct measure of physical activity.