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Effects of a controlled pedometer-intervention trial for low-active adolescent girls |
Schofield L, Mummery WK, Schofield G |
Medicine and Science in Sports and Exercise 2005 Aug;37(8):1414-1420 |
clinical trial |
3/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed* |
PURPOSE: This intervention compares the effectiveness of daily step count targets with time-based prescription for increasing the health-related physical activity of low-active adolescent girls. METHODS: We assigned participants (n = 85, mean age 15.8 +/- 0.8 yr) depending on school attended to a control (CON), pedometer (PED), or minutes (MIN) group. The intervention groups were involved in a 12-wk physical activity self-monitoring and educative program. The only difference between the intervention groups was that the PED group set daily step count targets whereas the MIN group set daily time-based goals for physical activity involvement. Pre-, mid-, and postintervention changes in physical activity (4-d blinded step count and 3-d physical activity recall) and body mass index (BMI) were assessed using a series of 3 (group assignment) x 3 (time) ANOVA. Where significant interactions were found, separate follow-up simple main effects tests were used. RESULTS: At postintervention, only the PED group had significantly increased their total activity as measured by a 4-d step count, when compared with the control (p = 0.03, ES 0.13). The group, time, and interaction effects for 4-d step count were significant, indicating that although both the participants in the PED and the MIN groups significantly increased their step count across the 12-wk intervention (p = 0.00 to 0.01), the participants in the PED group had a greater increase at the midintervention time point (p = 0.04, ES 0.10). No pre-, mid-, or postintervention changes were reported in any group for BMI (F = 1.18, p = 0.32). CONCLUSION: The use of pedometers and daily step count targets with low-active adolescent girls may result in short-term (6 wk) enhanced physical activity related outcomes when compared with traditional time-based physical activity prescriptions. However, both interventions appear to result in similar improvements in physical activity when duration of the observation is extended to 12 wk.
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