Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2024) 23, 559 - 570   DOI: https://doi.org/10.52082/jssm.2024.559

Research article
The Release of Lipolytic Hormones during Various High-Intensity Interval and Moderate-Intensity Continuous Training Regimens and Their Effects on Fat Loss
Xiangui Zhu1, Jiao Jiao2,3, Yu Liu1, Hong Li1, Haifeng Zhang1,4, 
Author Information
1 Physical Education College, Hebei Normal University, Shijiazhuang, China
2 Department of Sport, Physical Education and Health, Hong Kong Baptist University, Hong Kong, China
3 Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, China
4 Hebei Provincial Key Lab of Measurement and Evaluation in Human Movement and Bio-Information, Hebei Normal University, Shijiazhuang, China

Haifeng Zhang
✉ Physical Education College, Hebei Normal University, Shijiazhuang, China
Email: zhanghaifeng@hebtu.edu.cn
Publish Date
Received: 30-04-2024
Accepted: 04-07-2024
Published (online): 01-09-2024
 
 
ABSTRACT

To investigate the release of lipolytic hormones during various high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT), and their effects on fat loss. 39 young women categorized as obese (with a body fat percentage (BFP) ≥30%) were randomly allocated to one of the following groups: all-out sprint interval training (SIT, n =10); supramaximal HIIT (HIIT120, 120%V̇O2peak, n = 10); HIIT (HIIT90, 90%V̇O2peak, n = 10), or MICT, (60%V̇O2peak, n = 9) for a twelve-week observation period consisting of 3 to 4 exercise sessions per week. Serum epinephrine (EPI) and growth hormone (GH) were measured during the 1st, 20th, and 44th training sessions. Body weight (BW), body mass index (BMI), whole-body fat mass (FM) and BFP were assessed pre- and post-intervention. Following the 1st and 20th sessions, significant increases in EPI (p < 0.05) were observed post-exercise in HIIT120 and HIIT90, but not in SIT and MICT. In the 44th session, the increased EPI was found in SIT, HIIT120, and HIIT90, but not in MICT (p < 0.05). For the GH, a significant increase was observed post-exercise in all groups in the three sessions. The increased EPI and GH returned to baselines 3 hours post-exercise. After the 12-week intervention, significant reductions in FM and BFP were found in all groups, while reductions in BW and BMI were only found in the SIT and HIIT groups. Greater reductions in FM and BFP, in comparison to MICT, were observed in the SIT and HIIT groups (p < 0.05). 12-week SIT, HIIT120, and HIIT90, in comparison to MICT, were more efficacious in fat reduction in obese women, partly benefiting from the greater release of lipolytic hormones during training sessions.

Key words: High-intensity interval training, moderate-intensity continuous training, exercise intensity, lipolytic hormones, obesity


           Key Points
  • After the 12-week intervention, increased levels of EPI were observed in the acute session following the completion of some varieties of HIIT (excluding MICT).
  • Significant increases in GH were observed post-exercise in various HIIT and MICT during the three acute sessions.
  • Various HIIT resulted in greater reductions of whole-body fat mass and body fat percentage (when compared to MICT).
 
 
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