Comment on: “Effect of High-Intensity Interval Training on Total, Abdominal and Visceral Fat Mass: A Meta-Analysis”
We would like to congratulate Maillard et al.  on their review, Effect of High-Intensity Interval Training on Total, Abdominal and Visceral Fat Mass: A Meta-Analysis, published recently in Sports Medicine . This is an extremely relevant topic since obesity is a pandemic health problem [2, 3] and high-intensity interval training (HIIT) has been shown to be an effective training method for the improvement of several physiological parameters [4, 5], including the body composition of overweight/obese individuals .
The results presented by Maillard et al.  contribute tremendously to this area of research. However, we feel the data should be interpreted with caution and would like to address five crucial points of concern.
The first of these points is the ambiguous description and analysis of certain studies included in the meta-analysis. For example, we highlight the reported lengths of the exercise sessions. In Table 2, Maillard et al.  demonstrate that, in the study by...
Compliance with Ethical Standards
No sources of funding were used to assist in the preparation of this letter.
Conflict of interest
Leonardo Vidal Andreato, Braulio Henrique Magnani Branco, and João Victor Esteves have no conflicts of interest relevant to the content of this letter.
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