Biology of Sport
eISSN: 2083-1862
ISSN: 0860-021X
Biology of Sport
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2/2016
vol. 33
 
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abstract:

Greater effects of high- compared with moderate-intensity interval training on cardio-metabolic variables, blood leptin concentration and ratings of perceived exertion in obese adolescent females

G Racil
1
,
JB Coquart
2
,
W Elmontassar
3
,
M Haddad
4
,
R Goebel
4
,
A Chaouachi
5
,
M Amri
1
,
K Chamari
6

  1. Department of Biological Sciences, Faculty of Science of Tunis, University Tunis El Manar, Tunis, Tunisia
  2. CETAPS, Faculty of Sport Sciences, University of Rouen, Mont Saint Aignan, France
  3. Laboratory of Biomechanics and Biomaterials Research Applied to Orthopedics, National Institute of Orthopedics, Manouba, Tunisia
  4. Sport Science Program, College of Arts and Sciences, Qatar University, Doha, Qatar
  5. Research Laboratory ‘‘Sport Performance Optimization’’, National Center of Medicine and Sciences in Sport (CNMSS),Tunis, Tunisia
  6. Athelte Health and Performance Research Centre, Aspetar, Qatar; Orthopedic and Sports Medicine Hospital, Doha, Qatar
Biol. Sport 2016;33:145-152
DOI: https://doi.org/10.5604/20831862.119863
Online publish date: 2016/04/25
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This study examined the effects of high- vs. moderate-intensity interval training on cardiovascular fitness, leptin levels and ratings of perceived exertion (RPE) in obese female adolescents. Forty-seven participants were randomly assigned to one of three groups receiving either a 1:1 ratio of 15 s of effort comprising moderate-intensity interval training (MIIT at 80% maximal aerobic speed: MAS) or high-intensity interval training (HIIT at 100% MAS), with matched 15 s recovery at 50% MAS, thrice weekly, or a no-training control group. The HIIT and MIIT groups showed improved (p˂0.05) body mass (BM), BMI Z-score, and percentage of body fat (%BF). Only the HIIT group showed decreased waist circumference (WC) (p=0.017). The effect of exercise on maximal oxygen uptake (VO2max) was significant (p=0.019, ES=0.48 and p=0.010, ES=0.57, HIIT and MIIT, respectively). The decrease of rate-pressure product (RPP) (p<0.05, ES=0.53 and ES=0.46, HIIT and MIIT, respectively) followed the positive changes in resting heart rate and blood pressures. Blood glucose, insulin level and the homeostasis model assessment index for insulin decreased (p<0.05) in both training groups. Significant decreases occurred in blood leptin (p=0.021, ES=0.67 and p=0.011, ES=0.73) and in RPE (p=0.001, ES=0.76 and p=0.017, ES=0.57) in HIIT and MIIT, respectively. In the post-intervention period, blood leptin was strongly associated with %BF (p<0.001) and VO2max (p<0.01) in the HIIT and MIIT groups, respectively, while RPE was strongly associated with BM (p<0.01) in the HIIT group. The results suggest that high-intensity interval training may produce more positive effects on health determinants in comparison with the same training mode at a moderate intensity.
keywords:

Intermittent exercise, Obesity, Effort perception, Children, Moderate exercise intensity

  
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