Association Between Daily Physical Activity and Clinical Anthropomorphic Measures in Adults With Cerebral Palsy

Objective: To describe the relationship between activity level and cardiovascular risk measures as well as describe general activity patterns of adults with cerebral palsy. Design: Cross‐sectional. Setting: Academic outpatient rehabilitation clinic. Participants: Adults with cerebral palsy (N=47). Interventions: Not applicable. Main Outcome Measures: Gross Motor Functional Classification System (GMFCS) level was determined by validated self‐report questionnaire. Activity (daily step count, walk time, sitting time, standing time, and transitional movements) over 6 days recorded using an activPAL. Weight, body mass index (BMI), and waist-to-hip ratio were measured. Bivariate relationships between anthropomorphic and activity measures were assessed. Results: Thirty-eight participants completed all measurements. Nine were excluded because of incomplete activPAL data. The median age was 28.50 years (interquartile range [IQR]=24.25-47.00), range 18-77 years. Participants’ GMFCS levels were I: 13%; II: 16%; III: 21%; IV: 34%; and V: 16%. Median steps/day for GMFCS I/II participants were 5258.3 (IQR=3606.8-6634.7), and median steps/day were 1681.3 (IQR=657.2-2751.8) and 30.0 (IQR=6.8-54.2) for GMFCS level III and IV/V participants, respectively. Significantly greater steps/day were found for GMFCS I/II or III participants compared to those GMFCS IV/V (P<.001 and P=.0074, respectively). In addition, 60.5% of the subjects had a BMI in the normal range, 10.5% were obese, 23.6% were overweight, and 5.3% were underweight. For subjects with GMFCS I/II, the Spearman's rank correlation coefficient for time standing and waist circumference was −0.73 (0.01). GMFCS III and GMFCS IV/V participants had respective correlations of −0.16 (0.71) and −0.01 (0.98). For subjects with GMFCS I/II, the Spearman's rank correlation coefficient for standing time and BMI was −0.55 (P=.08). For the GMFCS III and GMFCS IV/V groups the respective correlations were −0.19 (0.67) and 0.00 (1.00). Conclusions: Subjects with GMFCS level I or II who engaged in more activity tended to have more favorable anthropometric profiles. Subjects with GMFCS level III, IV, or V did not have a similar trend. Our findings suggest factors beyond activity patterns affect anthropometrics to a greater degree in those with higher GMFCS levels.