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Leveraging Smartphone Mobility Data to Understand HIV Risk Among Rural South African Young Adults: Feasibility Study

Leveraging Smartphone Mobility Data to Understand HIV Risk Among Rural South African Young Adults: Feasibility Study

We conducted a pilot study to assess the feasibility of using smartphone GPS technology to study linkages between human mobility and poor HIV outcomes among young adults in rural Kwa Zulu-Natal, South Africa. Young adults in this setting are highly mobile [7] and experience complex and intersecting vulnerabilities (poor risk perception, economic hardships, and lack of social support), increasing their risk of poor HIV care outcomes [14,25].

Thulile Mathenjwa, Elphas Luchemo Okango, Khai Hoan Tram, Maxime Inghels, Diego Cuadros, Hae-Young Kim, Fiona Walsh, Till Barnighausen, Adrian Dobra, Frank Tanser

JMIR Mhealth Uhealth 2025;13:e67519

Improving Affective Associations With Physical Activity via a Message-Based mHealth Intervention (WalkToJoy): Proof-of-Concept Study

Improving Affective Associations With Physical Activity via a Message-Based mHealth Intervention (WalkToJoy): Proof-of-Concept Study

While previous research has demonstrated that pairing PA cues with positively valenced stimuli can improve implicit attitudes and affective evaluations [36-38], such studies have typically been brief and conducted with young adult populations in highly controlled settings. In contrast, Walk To Joy applied this mechanism in a real-world m Health context among middle-aged and older adults.

Soo Ji Serisse Choi, Pei-Yao Hung, Mengyun Liu, Walter Dempsey, Mark W Newman, Predrag Klasnja

J Med Internet Res 2025;27:e75792