Abstract: TH-PO804

Validation of a New Physical Activity Instrument against Pedometers among Dialysis Patients

Session Information

Category: Dialysis

  • 607 Dialysis: Epidemiology, Outcomes, Clinical Trials - Non-Cardiovascular

Authors

  • Kittiskulnam, Piyawan, Chulalongkorn university, Bangkok, Thailand
  • Sheshadri, Anoop, None, San Francisco, California, United States
  • Johansen, Kirsten L., University of California, San Franicsco, San Francisco, California, United States
Background

The newly developed Low Physical Activity Questionnaire (LoPAQ) was designed to capture the low activity level among physically inactive patients undergoing dialysis and correlated well with physical activity questionnaires used in general population. However, this instrument has not been validated against a more objective measure.

Methods

We performed a cross-sectional study and recruited 55 ambulatory patients receiving HD or PD for ≥3 months from 3 dialysis facilities in San Francisco during 2016-7. Spontaneous walking activity was measured by pedometers over 7 days including a dialysis-free weekend and used as the reference. Patients were instructed to record their activities and step count readings. Study coordinators administered the LoPAQ and recorded participants’ responses during a dialysis session (HD) or clinic visit (PD). We used measures in the LoPAQ that can be compared with available metrics, including minutes of walking in the past week and time expended from light to vigorous, and total physical activity. We also asked about the average time spent in sitting activities over 1 week. Spearman correlation was used to determine whether the LoPAQ results correlate with step counts.

Results

Fifty-two dialysis patients (HD=45, PD=7) completed the LoPAQ. Mean age was 57±12 years with 80% men. Median dialysis vintage was 39 (IQR, 17-708) months. Total kilocalories per week (kcal/wk) of physical activity reported on the LoPAQ were 630 (420-2,222). Participants reported an average of 5.7±3.2 sedentary hours per day. Most patients (83%) reported walking activity around the neighborhood, for transportation, and/or for fitness or pleasure, with a median of 560 (52-1,225) kcal/wk. The patients had average step counts of 18,578 (9,701-37,029) steps/week (2,630 [1,360-5,176] steps/day). The activity reported on the LoPAQ correlated with that reported on weekly pedometer readings (r=0.37, p=0.006). In addition, energy expenditure in walking between the LoPAQ and weekly step counts was highly correlated (r=0.59, p<0.001), particularly among PD patients (r=0.82, p=0.01).

Conclusion

The LoPAQ was easier and less time-consuming than previously validated physical activity questionnaires. LoPAQ demonstrated a good correlation, similar to other widely used physical activity instruments, with objective pedometer step counts among dialysis patients.

Funding

  • NIDDK Support