"Theory-based intervention increases physical activity in South African men: a cluster-randomized controlled trial." Preventive Medicine, 2014.

John B. Jemmott III, Loretta S. Jemmott, Zolani Ngwane, Jingwen Zhang, G. Anita Heeren, Larry D. Icard, Ann O'Leary, Xoliswa Mtose, Anne Teitelman, Craig Carty
Research Area: 

Objective: To determine whether a health-promotion intervention increases South African men's adherence to physical-activity guidelines.

Method: We utilized a cluster-randomized controlled trial design. Eligible clusters, residential neighborhoods near East London, South Africa, were matched in pairs. Within randomly selected pairs, neighborhoods were randomized to theory-based, culturally congruent health-promotion intervention encouraging physical activity or attention-matched HIV/STI risk-reduction control intervention. Men residing in the neighborhoods and reporting coitus in the previous 3 months were eligible. Primary outcome was self-reported individual-level adherence to physical-activity guidelines averaged over 6-month and 12-month post-intervention assessments. Data were collected in 2007–2010. Data collectors, but not facilitators or participants, were blind to group assignment.

Results: Primary outcome intention-to-treat analysis included 22 of 22 clusters and 537 of 572 men in the health-promotion intervention and 22 of 22 clusters and 569 of 609 men in the attention-control intervention. Model-estimated probability of meeting physical-activity guidelines was 51.0% in the health-promotion intervention and 44.7% in attention-matched control (OR = 1.34; 95% CI, 1.09–1.63), adjusting for baseline prevalence and clustering from 44 neighborhoods.

Conclusion: A theory-based culturally congruent intervention increased South African men's self-reported physical activity, a key contributor to deaths from non-communicable diseases in South Africa.

Published in Volume 64, pages 114-120