Key result
Sprint interval training significantly improved cardiorespiratory fitness compared with moderate-intensity continuous training in overweight or obese persons (MD -0.92).
Why the study?
The effects of high-intensity training compared with moderate-intensity continuous training on cardiorespiratory fitness and body fat percentage in overweight or obese persons needed evaluation.
Does high-intensity training (SIT or HIIT) improve cardiorespiratory fitness and body fat percentage compared to moderate-intensity continuous training in overweight or obese persons?
Meta-Analysis (n=784)
Does high-intensity training (SIT or HIIT) improve cardiorespiratory fitness and body fat percentage compared to moderate-intensity continuous training in overweight or obese persons?
Moderate-intensity continuous training significantly improved cardiorespiratory fitness compared to sprint interval training in overweight or obese individuals, with no significant differences in body fat percentage between training modalities.
Favors sprint interval training over moderate continuous training for CRF gains in overweight/obese adults; extends Level 1 evidence on high-intensity protocols.
BACKGROUND: High-intensity training is comprised of sprint interval training (SIT) and high-intensity interval training (HIIT). This study compared high-intensity training with moderate-intensity continuous training (MICT) on cardiorespiratory fitness (CRF) and body fat percentage for overweight or obese persons. METHODS: A systematic search of randomized controlled trials using the health science databases occurred up to April, 2020. Twenty-six studies were included for complete analysis. A total of 784 participations were analyzed. The unstandardized mean difference for each outcome measurement was extracted from the studies and pooled with the random effects model. RESULTS: MICT was significantly better at improving CRF compared with SIT (mean difference = -0.92; 95% confidence interval, -1.63 to -0.21; P = .01; I2 = 10%). Furthermore, there was no significant difference between MICT versus HIIT on CRF (mean difference = -0.52; 95% confidence interval, -1.18 to 0.13; P = .12; I2 = 23%). There was no significant difference in body fat percentage between MICT versus HIIT and MICT versus SIT. CONCLUSIONS: MICT was significantly better at improving CRF than SIT in overweight or obese persons.
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Rugbeer et al. (2021) conducted a meta-analysis in Overweight or obesity (n=784). Sprint interval training (SIT) and High-intensity interval training (HIIT) vs. Moderate-intensity continuous training (MICT) was evaluated on Cardiorespiratory fitness (VO2max or VO2peak) (MD -0.92, 95% CI -1.63 to -0.21, p=.01). Sprint interval training significantly improved cardiorespiratory fitness compared with moderate-intensity continuous training in overweight or obese persons (MD -0.92).
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