Associations between Physical Activity Motives and Trends in Moderate-to-Vigorous Physical Activity Among Adolescents Over Five Years.
Bibliographic record
Abstract
Abstract BACKGROUNDMotives for participation in physical activity (PA) have been associated with moderate-to-vigorous intensity PA (MVPA); however, these associations have yet to be established during the transition from childhood to adolescence. This study examined the longitudinal associations between five PA motives (i.e., enjoyment, competence, fitness, social, and appearance) and MVPA over a 5-year period spanning late childhood (9-11 years), early adolescence (12-14 years), and middle adolescence (15-16 years). METHODSSelf-report data (n = 937) were drawn from the ongoing Monitoring Activities for Teenagers to Comprehend their Habits study. The Motives for Physical Activity Measure-Revised (MPAM-R) questionnaire was used to measure PA motives. MVPA was assessed with an empirically supported 2-item measure developed specifically for adolescents. Data from three times points per school year over 5 years (resulting in 15 survey cycles) were analyzed using sex-stratified mixed effects regression models after establishing longitudinal measurement invariance for the MPAM-R.RESULTSMVPA increased from cycle 1 (9-11 years) to 7 (11-13 years) for girls and from cycle 1 (9-11 years) to 9 (12-14 years) for boys before decreasing for both sexes through to cycle 15 (14-16 years). Longitudinal measurement invariance was established for a 22-item version of the MPAM-R. For boys, enjoyment and competence motives were positively associated with MVPA from late childhood to middle adolescence and fitness motives were negatively associated with MVPA from late childhood to middle adolescence. For girls, enjoyment motives were positively associated with MVPA during late childhood and competence motives were positively associated with MVPA from late childhood to middle adolescence. CONCLUSIONSPA interventions should aim to increase enjoyment during PA and provide opportunities for children and adolescents to develop a desire to build competence during PA. PA interventions targeted to youth should avoid promoting the desire to be active to improve fitness, particularly among boys.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".