Physical activity and vascular comorbidity in Black and White persons with multiple sclerosis: A cross-sectional study.

The cross-sectional design cannot prove that physical activity causes changes in vascular comorbidity; it only shows they are linked at one point in time. The sample had low disability status (median PDDS 1.0) and long disease duration (mean 13.4 years), so results may not apply to patients with more severe MS or shorter disease duration. Vascular comorbidities were assessed by self-report questionnaire rather than medical records or clinical examination, which may introduce reporting bias. Diet and other lifestyle factors were not controlled for, even though they strongly influence vascular health. The study only included black and white participants, so findings do not generalize to other racial or ethnic groups with MS. The association between moderate-to-vigorous physical activity and vascular comorbidities was only significant in the white group, leaving the lack of association in the black group unexplained.

The authors reported no conflicts of interest. The study was supported by non-U.S. government and NIH extramural funding.

Do not conclude that physical activity fails to protect against vascular comorbidities in black persons with MS. The study found no significant association, but this may reflect unmeasured factors or statistical limitations rather than a true absence of benefit. Also, do not attribute the lower activity levels in black participants solely to race, as socioeconomic and clinical covariates were adjusted for, and the difference emerged only after this adjustment.