{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T19:07:19Z","timestamp":1782846439896,"version":"3.54.5"},"reference-count":58,"publisher":"JMIR Publications Inc.","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JMIR Mhealth Uhealth"],"abstract":"Abstract<\/jats:title>\n \n Background<\/jats:title>\n Artificial intelligence (AI)\u2013driven pose estimation (PE) offers a scalable and cost-effective solution to track exercises in mobile health apps. However, occlusion, influenced by camera angle and distance, can reduce detection accuracy and repetition counting precision. The influence of smartphone positioning on these performance metrics remains underexplored in controlled studies.<\/jats:p>\n <\/jats:sec>\n \n Objective<\/jats:title>\n The study aimed to examine how smartphone camera angle (front, side, and diagonal) and distance (90 cm, 180 cm, 200 cm, and 360 cm) affect detection performance and repetition counting accuracy during push-ups and squats using AI-based PE.<\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n In this cross-sectional, within-subject study, 44 healthy university students (9 [20.5%] female participants; mean age 20.3 y, SD 0.4 y; mean BMI 23.2, SD 0.6 kg\/m\u00b2) were assigned to perform either squats or push-ups. Each participant completed their assigned exercise across 12 predefined smartphone camera configurations, yielding approximately 264 squat trials (n=22) and 264 push-up trials (n=22). Each trial consisted of an average of 5 repetitions, totaling approximately 1320 repetitions per exercise. PE performance was assessed using binary classification accuracy, detection rate, and mean absolute error (MAE) for repetition counting. Generalized linear mixed-effects models evaluated classification odds, linear mixed-effects models analyzed MAE, and Tukey-adjusted post hoc tests followed significant effects.<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n The mean detection rate was 61.1% (SD 48.8%) for push-ups and 61.5% (SD 48.7%) for squats, with MAEs of 1.08 (SD 1.78) and 1.11 (SD 1.82) repetitions, respectively. Push-ups were most accurately detected from diagonal views at 90 to 180 cm (up to 85.7% detection; MAE=0.28) and least accurately from the front at 360 cm (20%; MAE=2.70). Squats performed best from a diagonal view at 200 cm (95.5%; MAE=0.05) and worst from the side at 90 cm (0%; MAE=5). Generalized linear mixed models showed that for push-ups, the front 90 cm and diagonal 360 cm views significantly reduced classification odds compared to the side 90 cm view (\n P<\/jats:italic>\n =.03 and\n P<\/jats:italic>\n =.04, respectively), whereas for squats, diagonal and front views significantly outperformed side views across all distances (\n P<\/jats:italic>\n <.001). Post hoc tests confirmed that for push-ups, diagonal close or mid-range views had significantly lower MAEs than far front views, and for squats, diagonal and front views at 180 to 200 cm achieved the highest accuracy and lowest MAEs (\n P<\/jats:italic>\n <.05).\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions<\/jats:title>\n AI-based PE effectiveness for exercise tracking is significantly affected by smartphone positioning. Diagonal and frontal views at mid-range distances (180\u2010200 cm) provided the highest detection accuracy and counting precision. These findings offer actionable guidance for developers, clinicians, coaches, and users optimizing mobile health exercise monitoring.<\/jats:p>\n <\/jats:sec>","DOI":"10.2196\/82412","type":"journal-article","created":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T01:20:05Z","timestamp":1769563205000},"page":"e82412-e82412","source":"Crossref","is-referenced-by-count":0,"title":["Evaluation of Smartphone Camera Positioning on Artificial Intelligence Pose Estimation Accuracy for Exercise Detection: Observational Study"],"prefix":"10.2196","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1002-4295","authenticated-orcid":false,"given":"Eduarda","family":"Oliosi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3556-2380","authenticated-orcid":false,"given":"Soraia","family":"Ferreira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2706-5598","authenticated-orcid":false,"given":"Ana Paula","family":"Giordano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-0676-2593","authenticated-orcid":false,"given":"Guilherme","family":"Viveiros","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5254-7409","authenticated-orcid":false,"given":"Jos\u00e9","family":"Parraca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1300-1163","authenticated-orcid":false,"given":"Paulo","family":"Pereira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2762-0333","authenticated-orcid":false,"given":"Federico","family":"Guede-Fern\u00e1ndez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1234-9464","authenticated-orcid":false,"given":"Salom\u00e9","family":"Azevedo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1010","published-online":{"date-parts":[[2026,3,5]]},"reference":[{"issue":"6","key":"R1","doi-asserted-by":"publisher","DOI":"10.2196\/mhealth.9459","article-title":"Analysis of the features important for the effectiveness of physical activity\u2013related apps for recreational sports: expert panel approach","volume":"6","author":"Dallinga","journal-title":"JMIR mHealth uHealth"},{"issue":"9838","key":"R2","doi-asserted-by":"publisher","first-page":"294","DOI":"10.1016\/S0140-6736(12)60898-8","article-title":"The pandemic of physical inactivity: global action for public health","volume":"380","author":"Kohl","journal-title":"Lancet"},{"issue":"1","key":"R3","doi-asserted-by":"publisher","first-page":"40","DOI":"10.1186\/s44247-024-00097-6","article-title":"Efficacy of digital interventions on physical activity promotion in individuals with noncommunicable diseases: an overview of systematic reviews","volume":"2","author":"Kardan","journal-title":"BMC Digit Health"},{"key":"R4","unstructured":"Physical activity. 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