Table 3.
Subgroup analysis of effects of HIIT vs. MICT on cardiorespiratory fitness.
| Subgroup | Synthesis Studies/Total (%) | SMD (95% CI) | MICT | HIIT | I2 (%) | p-Value | p for Interaction |
|---|---|---|---|---|---|---|---|
| Total | 8/8 (100) | 0.87 (0.39, 1.35) |
|
56.8 | 0.023 | ||
| Gender | 0.903 | ||||||
| Boys | 4/8 (50) | 0.91 (0.17, 1.65) | 63.6 | 0.041 | |||
| Both | 4/8 (50) | 0.83 (0.10, 1.56) | 61.8 | 0.049 | |||
| Age | 0.472 | ||||||
| ≤13 years | 4/8 (50) | 0.69 (0.23, 1.16) | 25.6 | 0.258 | |||
| >13 years | 4/8 (50) | 1.12 (0.15, 2.09) | 73.4 | 0.010 | |||
| Modality | 0.257 | ||||||
| Running | 6/8 (75) | 1.05 (0.47, 1.64) * | 61.2 | 0.024 | |||
| Cycling | 2/8 (25) | 0.29 (−0.34, 0.92) | 0.0 | 0.370 | |||
| Duration | 0.525 | ||||||
| ≤8 weeks | 4/8 (50) | 0.68 (−0.04, 1.39) | 57.3 | 0.071 | |||
| >8 weeks | 4/8 (50) | 1.05 (0.34, 1.76) * | 63.1 | 0.043 | |||
| Time | 0.473 | ||||||
| <20 min | 2/8 (25) | 1.64 (0.79, 2.49) * | 34.2 | 0.218 | |||
| 20–30 min | 4/8 (50) | 0.47 (0.06, 0.88) * | 0.0 | 0.633 | |||
| >30 min | 2/8 (25) | 1.09 (−0.40, 2.58) | 79.0 | 0.029 | |||
| Settings | 0.375 | ||||||
| Laboratory | 6/8 (75) | 0.81 (0.34, 1.28) * | 44.0 | 0.112 | |||
| School | 2/8 (25) | 1.16 (−0.78, 3.10) | 86.1 | 0.007 | |||
| Work/rest ratio | 0.686 | ||||||
| <1 | 2/8 (25) | 0.98 (−0.81, 2.76) | 82.1 | 0.018 | |||
| =1 | 2/8 (25) | 1.16 (−0.78, 3.10) | 86.1 | 0.007 | |||
| >1 | 4/8 (50) | 0.75 (0.36, 1.14) * | 0.1 | 0.391 | |||
| Work duration | 0.296 | ||||||
| <1 min | 3/8 (38) | 1.38 (0.10, 2.66) * | 79.0 | 0.009 | |||
| 1–4 min | 2/8 (24) | 0.68 (−0.01, 1.37) | 46.4 | 0.155 | |||
| =4 min | 3/8 (38) | 0.62 (0.08, 1.17) * | 0.0 | 0.446 | |||
* means that the improvement of VO2max is significantly different in this subgroup parameter.