Weeks 2008.
| Methods | Design: randomized controlled trial Theoretical framework: unstated Number of intervention groups: 1 Number of control groups: 1 Follow‐up: immediately post‐intervention | |
| Participants | N (intervention): 43
N (control): 38 Age (mean): 13.8 years Sex: male and female Ethnicity: unstated |
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| Interventions | Country: Australia Setting: school, unstated whether urban or rural Provider: research staff Duration: 8 months Intervention: 10 min of directed jumping activity at the beginning of every physical education (PE) class (twice per week). Activities designed to apply loads to the skeleton at high strain magnitude, frequency, and rate, and included: jumps, hops, tuck‐jumps, jump‐squats, stride jumps, star jumps, lunges, side lunges, and skipping. Jumps were occasionally supplemented with upper body strengthening activities, including push‐ups and exercises with resistive latex bands (AusBand; Ausmedic Australia). Control: regular PE warm‐ups and stretching directed by their usual PE teacher at the beginning of every PE class (twice per week). Activities focused on improving flexibility and general preparedness for physical activity without specifically loading the skeleton at higher rates than normal, including: brisk walking, light jogging, and stretching | |
| Outcomes | Duration of physical activity Body mass index (kg/m2) |
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| Notes | ||
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | Comment: no description of the randomization process given |
| Allocation concealment (selection bias) | Low risk | Comment: criterion not applicable because all participants were allocated at 1 point in time following recruitment, so at time of recruitment allocation was not known |
| Blinding (performance bias and detection bias) All outcomes | Unclear risk | Comment: no Information given, likely not done |
| Incomplete outcome data (attrition bias) All outcomes | High risk | Comment: intention‐to‐treat analysis was not completed on the outcomes of interest |
| Selective reporting (reporting bias) | Low risk | Comment: all outcomes identified a priori were reported on |
| Confounders controlled? | Low risk | Comment: all relevant outcomes were accounted for |
| Data collection methods valid and reliable? | Unclear risk | Comment: reliability and validity were not discussed |