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

• Main Authors: Jong-Hwan Choi, Hyun-Seung Rhyu, Keun-Su Kim, In-Ki Kim
• Format: Article
• Language: English
• Published: Asian Society of Kinesiology 2018-10-01
• Series: The Asian Journal of Kinesiology
• Subjects: ACTN-3 geno polymorphism; Air Force Cadets; G-tolerance Exercise Program
• Online Access: http://ajkinesiol.org/upload/pdf/ajk-2018-20-4-50.pdf

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.