Elimination of Influences of the ACTN3 R577X Variant on Oxygen Uptake by Endurance Training in Healthy Individuals

Author(s):Show less -

Silva, Michelle S. M. ^[1] ; Bolani, Wladimir ^[1] ; Alves, Cleber R. ^[2] ; Biagi, Diogo G. ; Lemos, Jr., Jose R. ^[1] ; da Silva, Jeferson L. ^[1] ; de Oliveira, Patricia A. ^[3] ; Alves, Guilherme B. ^[3] ; de Oliveira, Edilamar M. ^[2] ; Negrao, Carlos E. ^[3] ; Krieger, Jose E. ^[1] ; Dias, Rodrigo G. ^[1] ; Pereira, Alexandre C. ^[1]

Affiliation

^[1] Univ Sao Paulo, Sch Med, Lab Genet & Mol Cardiol, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Sch Phys Educ & Sport, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Sch Med, Unit Cardiac Rehabil & Exercise Physiol, Sao Paulo - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF SPORTS PHYSIOLOGY AND PERFORMANCE; v. 10, n. 5, p. 636-641, JUL 2015.
• Web of Science Citations: 6

Abstract

Aim: To study the relationship between the ACTN3 R577X polymorphism and oxygen uptake (VO2) before and after exercise training. Methods: Police recruits (N = 206, 25 +/- 4 y) with RR (n = 75), RX (n = 97), and XX (n = 33) genotypes were selected. After baseline measures, they underwent 18 wk of running endurance training. Peak VO2 was obtained by cardiopulmonary exercise testing. Results: Baseline body weight was not different among genotypes. At baseline, XX individuals displayed higher VO2 at anaerobic threshold, respiratory compensation point, and exercise peak than did RR individuals (P < .003). Endurance training significantly increased VO2 at anaerobic threshold, respiratory compensation point, and exercise peak (P < 2 x 10(-6)), but the differences between XX and RR were no longer observed. Only relative peak VO2 exercise remained higher in XX than in RR genotype (P = .04). In contrast, the increase in relative peak VO2 was greater in RR than in XX individuals (12% vs 6%; P = .02). Conclusion: ACTN3 R577X polymorphism is associated with VO2. XX individuals have greater aerobic capacity. Endurance training eliminates differences in peak VO2 between XX and RR individuals. These findings suggest a ceiling-effect phenomenon, and, perhaps, trained individuals may not constitute an adequate population to explain associations between phenotypic variability and gene variations. (AU)

• FAPESP's process: 05/59740-7 - Physical exercise and autonomic control in cardiovascular physiopathology
• Grantee: Carlos Eduardo Negrão
• Support Opportunities: Research Projects - Thematic Grants