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Table 5 Hedges' g effect sizes and 95% confidence intervals for the differences in the effects of extra-PE HIIT and other forms of exercise on parameters related to health

From: Effects of High-Intensity Interval Training in School on the Physical Performance and Health of Children and Adolescents: A Systematic Review with Meta-Analysis

Parameter

Number of studies

Number of participants

References

Hedges’ g

Cl (95%)

Lower limit

Upper limit

Weight

6

353

[10, 24, 39,40,41,42]

1.49 ± 0.89

0.95

2.04

Maximal oxygen uptake

6

316

[10, 24, 39, 40, 42, 43]

− 1.04 ± 3.27

− 1.45

− 0.62

Maximal heart rate

5

207

[24, 39, 40, 42, 43]

2.22 ± 2.90

1.75

2.69

Maximal aerobic speed

4

226

[24, 39,40,41]

− 3.96 ± 3.15

− 3.99

− 3.92

Percentage body fat

3

143

[39, 41, 42]

0.52 ± 0.30

− 0.09

1.12

Body mass index

2

172

[10, 24]

0.94 ± 1.58

0.80

1.07

Maximal work rate*

2

53

[42, 43]

− 1.19 ± 3.76

− 3.16

0.79

Blood lactate

1

18

[42]

1.47

1.21

1.74

Diastolic blood pressure

1

109

[10]

0.76

0.54

0.97

Fasting level of blood glucose

1

109

[10]

5.88

5.86

5.89

Fasting level of blood insulin

1

109

[10]

− 0.03

− 0.34

0.28

Flexibility

1

72

[41]

3.56

3.38

3.74

Jump performance

1

72

[41]

1.81

1.24

2.37

Number of sit-ups

1

72

[41]

2.60

2.49

2.72

Systolic blood pressure

1

109

[10]

0.19

− 0.17

0.56

  1. *Maximal work rate (Ppeak), in Watts (W), was determined during an incremental load test on a cycle ergometer [42, 43]