چکیده:
Background. High-intensity interval training (HIIT) may affect acylated ghrelin (AG) through changes in body composition.
Objectives. The present study was designed to investigate and compare the effects of two different orders of wrestling-based HIIT on AG levels and body composition in highly trained wrestlers.
Methods. Forty-two male wrestlers (aged 16–21 years) were randomly assigned to one of three groups: HIIT23 (2 sets of 3 min wrestling techniques; 80-90% HRmax); HIIT32 (3 sets of 2 min wrestling techniques; 90-100% HRmax); and a control group that performed routine wrestling exercises. HIIT protocol consisted of eight techniques which were performed three day/week for eight weeks. Body composition and total plasma AG were measured 48 h before and after the protocol.
Results. Body fat percentage (p<0.01) and weight (p<0.05) were significantly decreased in the HIIT groups from pre- to post-test. There was also a significant decrease in body fat percentage of both HIIT groups compared to the control group (p=0.002). Although a significant increase in post-test AG was observed in all the groups, AG levels in HIIT groups was approximately twofold higher than control group (p<0.01).
Conclusion. It seems that eight weeks of wrestling-based HIIT can cause to significant decreases in body fat percentage and weight which is related to increase in total levels of plasma AG in highly trained wrestlers.
خلاصه ماشینی:
The Effect of Sport-Specific High Intensity Interval Training on Ghrelin Levels and Body Composition in Youth Wrestlers 1Keivan Akhoundnia, 2Amir Rashid Lamir*, 1Rambod Khajeie, 3Hamid Arazi 1Department of Physical Education, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran.
High-Intensity Interval Training (HIIT) may affect Acylated Ghrelin (AG) through changes in body composition.
The present study was designed to investigate and compare the effects of two different orders of wrestling-based HIIT on AG levels and body composition in highly trained wrestlers.
Because of the brief nature of HIIT, improvements in body composition may also be attributed to changes in the appetite-regulating hormones in a manner that contributes to a decrease in energy intake after exercise.
Therefore, we aimed to compare the eight weeks effect of two types of wrestling-based HIIT on body composition and plasma levels of AG in elite wrestlers.
All participants completed two familiarization/pilot sessions (one week) prior to the first training session to introduce HIIT protocols, suitable exercise intensity (a percentage of HRmax; automatic HR monitor; Beurer; PM80; Germany) and reduce any learning effects during subsequent sessions.
The main aim of the present study was to compare the effects of two different orders of wrestling-based HIIT which have been added to the routine wrestling exercises with an equivalent period of routine wrestling exercises on body composition and plasma concentrations of AG in wrestlers.
CONCLUSION Generally, we conclude that eight weeks of wrestling-based HIIT can lead to significant improvements in body composition, specifically, body fat percentage and weight which is related to increase in total levels of plasma AG in highly trained wrestlers.