The Asian Journal of Kinesiology (Oct 2018)

Changes in Body Composition and Physical Fitness According to ACTN-3 Gene Polymorphism in Male Air Force Cadets During 8 Weeks of G-tolerance Exercise Program

  • Jong-Hwan Choi,
  • Hyun-Seung Rhyu,
  • Keun-Su Kim,
  • In-Ki Kim

DOI
https://doi.org/10.15758/ajk.2018.20.4.50
Journal volume & issue
Vol. 20, no. 4
pp. 50 – 59

Abstract

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OBJECTIVES This study set out to develop and administer an 8-week G-tolerance reinforcement exercise program and examine changes to the body composition, cardiovascular endurance, isokinetic muscular function, and G-tolerance ability of air force cadets according to the ACTN-3 gene polymorphism, thus testing the effects of the program on air force cadets according to the ACTN-3 gene polymorphism. METHODS For those purposes, the investigator analyzed the gene polymorphisms of ACTN-3 of 30 air force cadets, administered the developed G-tolerance reinforcement exercise program to and conducted analysis of its effects on their body composition, cardiovascular endurance, isokinetic muscular functions(muscular strength and endurance), and G-tolerance capacity(6G/30sec). RESULTS Found a significant increase in skeletal muscle mass in the RR and RX types, and body fat percentage in the XX type. the program caused a significant increase to the of the subjects across all the geno types and to their cardiovascular endurance in the RX and XX types. the dominant knee joint(right leg) and found a significant increase in the peak torque per body weight in the RX and XX type. As for the dominant knee joint(right leg), there was a significant increase in the total work per body weight in the RR, RX, and XX types. the G-tolerance ability in the RX than in the RR type, and and G-tolerance ability of XX type was also increased. CONCLUSIONS In summary, those findings demonstrate that there were differences in the changing patterns of air force cadets' G-tolerance ability according to the ACTN-3 gene polymorphism(RR, RX, and XX) after the G-tolerance reinforcement exercise program and that there was a more increase in the G-tolerance ability in the RX than in the RR type, and G-tolerance ability of XX type was also increased. Therefore, the G-tolerance reinforcement exercise program is verified as effective for reinforcing the G-toleran capacity of air force cadets who have either genotype RX or XX.

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