Aerobic exercise for HIV-associated neurocognitive disorders in individuals on antiretroviral therapy: A randomised controlled trial

Introduction The increasing burden of self-limiting forms of HIV-associated neurocognitive disorder (HAND) in the antiretroviral therapy era calls for adjunctive interventions. The study aimed to determine the effects of a 12-week aerobic exercise programme on HAND. Methods This is a parallel-group, randomized controlled trial with concealed allocation and intention-to-treat analysis. This study was a clinic-based programme. Seventy-three patients with HAND were enrolled in the trial. The intervention comprised a moderate-intensity aerobic exercise, 20–60 min per session, three times per week, for twelve weeks. The control group received exercise education. Prevalence of HAND constituted the primary outcome. HAND was identified and classified following the Frascati criteria. We computed the odds ratio and number needed-to-treat to estimate the treatment effect. Results There were 73 patients (38 in exercise and 35 in control arm). Individuals in the exercise arm recorded a significantly higher reduction in working memory deficit (OR = 5.14; CI = 2.6–10.4; NNT = 6) but not in attention-deficit (OR = 0.31, CI = 0.2–0.5; NNT = −5) compared to the control group at twelve-week. Reductions in attention deficit (OR = 1.55, 95 CI = 1.0–2.4; NNT = 5) and HAND prevalence (OR = 1.8, 95 CI = 1.2–2.8); NNT = 8) were significantly higher in the exercise group compared the control group at three-month. No significant between-group difference in functional independence was observed immediately after exercise (p > 0.05). Discussion The neuroprotective effects of aerobic exercise appear selective and vary with cognitive abilities impaired and aerobic capacity, with a greater change occurring with improved aerobic capacity. Conclusion Individuals with working memory and attention deficits may benefit more from moderate-intensity aerobic exercise.