Relativizing effects of high intensity interval training vs continuous moderate

Abstract

The production of systematic reviews and meta-analysis increased substantially. In this sense, we highlight those comparing Moderate-Intensity Continuous Training (MICT) and High-Intensity Interval Training (HIIT). It is known that meta-analyses of well-conducted studies are considered as a superior level of scientific evidence; therefore, it is relevant to critically analyze all those articles, especially speaking about the absence of differences between MICT and HIIT reported in previous studies. Widely, analyzing studies included in a meta-analysis frequently is possible to identify a lack of crucial information to the understanding of the exercise intervention, and this can skew readers interpretation and may conduct an equivocate comprehension of the results. In meta-analysis regarding the effects of MICT and HIIT in body composition, the relativization of the full length of training time of each intervention is frequently lacking. Data from previously published meta-analysis was reanalyzed, verifying higher relative reductions of body fat percentage to the HIIT group in comparison to the MICT group when considered the duration of interventions. In this sense, we suggest that all meta-analysis about this subject need not only to provide complete analysis in body composition but also consider analysis relativized of time spent training.

Retrospective Comparison of Two Circuit Training Programs with Different Intensities in Obese and Overweight Individuals

“…However, MICT requires higher volume to induce a reduction In Body Weight (BW), therefore High Intensity Interval Training (HIIT) was introduced as a time saving alternative for weight control [9]. Several studies comparing MICT to HIIT in several health parameters [4] demonstrate that both regimes are beneficial, but the effects on Body Fat (BF) vary [10][11][12][13][14][15]. However, neither MICT nor HIIT protocols used in these meta-analyses seem to be in agreement with the public physical activity recommendations [16][17][18][19].…”

“…Numerous interventions can be offered to obese and overweight individuals, such as nutrition and behavioural modifications, surgical and pharmacological treatments and increase of physical activity levels [3]. Physical activity and exercise seem to have a positive effect on health parameters [4], however research suggests that 50% of the individuals starting an exercise program in order to increase their physical activity level, will drop out within the first 6-months [5]. A variety of factors that prevent individuals from exercising were identified, including lack of motivation and time, access to facilities or equipment, lack of energy or workout partner and self-efficacy [6,7].…”