Physical Activity Intervention Effects on Waist-to-Hip Ratio in African American Men Living With HIV.

People living with HIV on antiretroviral therapy have an increased risk of developing metabolic disturbances and central adiposity. Adequate engagement in physical activity (PA) could reduce the risk of chronic diseases associated with central adiposity. We conducted a secondary analysis of data from a randomized controlled trial of a PA intervention with 302 African American men aged 40 or older (53.9±7.2 years) living with HIV to assess whether the intervention reduced the waist-to-hip ratio (WHR). Generalized estimating equation analyses tested whether the PA intervention reduced WHR compared with the control group and whether age moderated its effect, adjusting for follow-up assessment time (3, 6, and 12 months postintervention) and baseline WHR and age. The analysis revealed that the intervention's effect on WHR was not significant ( = -0.008, = .097). However, a significant interaction between age and the intervention ( = 0.001, = .046) indicated that the intervention's effect in reducing WHR waned with increasing age. For instance, when dividing participants into three age subgroups, the intervention reduced WHR for men ages 40 to 50 ( = -0.020, = .013) and ages 50 and 60 ( = -0.007, = .315) but increased it among those older than 60 ( = 0.013, = .252). The intervention's effects on WHR differed by participants' age, suggesting that different PA strategies may be needed based on age to improve the metabolic profile and reduce chronic disease risk in African American men living with HIV.