1. Introduction
2. Methods and Procedures
2.1. Participants
2.2. Study Design
2.3. Biochemical Analyses
2.4. Accelerometry Data Reduction
2.5. Analyses
3. Results
Participants characteristics | Control (
) | Intervention (
) |
---|---|---|
Age (years),
| 15.3
1.1 | 16.0
1.2 |
Female,
| 11 (68.8%) | 8 (57.1%) |
BMI (Kg/m2),
| 36.4
7.4 | 35.7
6.5 |
Baseline SOC,
| ||
Contemplation | 5 (31.3%) | 5 (33.3%) |
Preparation | 7 (43.8%) | 6 (40.0%) |
Action | 1 (6.3%) | 1 (6.7%) |
Maintenance | 3 (18.8%) | 3 (20.0%) |
Tanner stage | ||
Genitalia,
| ||
Tanner 1 | 0 | 0 |
Tanner 2 | 0 | 0 |
Tanner 3 | 4 (25.0%) | 5 (35.7%) |
Tanner 4 | 9 (56.3%) | 3 (41.4%) |
Tanner 5 | 3 (18.8%) | 6 (42.9%) |
Tanner stage | ||
Pubic hair,
| ||
Tanner 1 | 0 | 1 (6.7%) |
Tanner 2 | 0 | 0 |
Tanner 3 | 3 (18.8%) | 4 (26.7%) |
Tanner 4 | 4 (25.0%) | 2 (13.3%) |
Tanner 5 | 9 (56.3%) | 8 (53.3%) |
Activity counts per minute,
| 293.4 (94.4) | 339.8 (106.8) |
Average Counts all days actually worn,
| 244950.0 (69978.5) | 275564.3 (81064.9) |
Average Activity Counts over 3 week days + 1 week-end day,
| 260352.0 (74771.6) | 291063.1 (99417.1) |
Frequency of Activity (questionnaire),
| 9.4 (7.2) | 8.1 (3.6) |
Light activity (minutes/week),
| 77.3 (24.4) | 84.8 (24.5) |
Moderate activity (minutes/week),
| 10.6 (10.2) | 16.6 (10.1) |
Vigorous activity (minutes/week),
| 0.90 (3.1) | 0.13 (0.4) |
Weight (kg),
| 98.0 (18.8) | 97.5 (20.1) |
BMI Z-scores (kg/m2),
| 2.2 (0.4) | 2.2 (0.4) |
Waist circumference (cm),
| 109.0 (16.1) | 109.7 (15.2) |
Hip circumference (cm),
| 114.4 (13.7) | 115.1 (14.0) |
Waist-to-hip ratio,
| 0.95 (0.1) | 0.96 (0.1) |
Wear time baseline (days),
| 6.9 (0.28) | 6.2 (0.97) |
Wear time baseline (hours/day),
| 14.2 (0.8) | 13.3 (1.5) |
3.1. Physical Activity Levels
Variable | Control group | Intervention group | ||||||
---|---|---|---|---|---|---|---|---|
Mean | SE | 95% CI | Mean | SE | 95% CI | |||
Activity counts per minute | 286.1 | 30.3 | 223.6–348.7 | 439.4 | 29.2 | 379.2–499.6 | .001 | 0.74 |
Average Counts all days actually worn | 222247.6 | 26519.5 | 167629.8–276865.4 | 345901.0 | 26519.5 | 291283.2–400518.8 | .003 | 0.50 |
Average Activity Counts over 3 week days
1 week-end day | 249640.2 | 22773.8 | 201974.1–297306.3 | 319169.4 | 22773.8 | 271503.3–366835.6 | .046 | 0.46 |
Frequency of Activity (questionnaire) | 14.5 | 1.7 | 10.9–18.0 | 12.6 | 1.8 | 8.8–16.4 | .458 | 0.56 |
Light activity (minutes/week) | 69.9 | 4.8 | 60.1–79.8 | 101.1 | 4.6 | 91.7–110.6 | .0009 | 0.70 |
Moderate activity (minutes/week) | 15.2 | 6.2 | 2.5–27.9 | 24.0 | 5.9 | 11.7–36.2 | .322 | 0.28 |
Vigorous activity (minutes/week) | 0.17 | 0.07 | 0.032–0.314 | 0.25 | 0.07 | 0.117–0.388 | .416 | 0.02 |
Weight (kg) | 98.5 | 0.8 | 96.8–100.1 | 95.9 | 0.9 | 94.1–97.6 | .034 | 0.44 |
BMI z-scores (kg/m2) | 2.21 | 0.022 | 2.17–2.25 | 2.15 | 0.023 | 2.10–2.19 | .054 | 1.03 |
Waist circumference (cm) | 107.4 | 1.22 | 104.9–109.9 | 107.2 | 1.30 | 104.5–109.9 | .915 | 0.26 |
Hip circumference (cm) | 115.6 | 0.69 | 114.2–117.0 | 112.3 | 0.74 | 110.8–113.8 | .003 | 0.57 |
Waist-to-hip ratio | 0.93 | 0.012 | 0.91–0.96 | 0.96 | 0.013 | 0.93–0.98 | .169 | 0.12 |