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Abstract
The core objective of this research was to measure the effects on levels of state anxiety of the application of Jacobson's (1938) progressive relaxation technique in university-level athletes who are members of the aerobic gymnastic team preparing to participate in the National University Championships in 2014. The sample was comprised of two groups. The experimental group was made up of 12 athletes from the aerobic gymnastic team at the Autonomous University of Sinaloa (UAS) (Mexico), while the control group was made up of 96 university-level athletes, whose ages ranged from 16 to 24. Both teams were administered the pre-test phase of the A-Estado scale from the Inventory of State Trait Anxiety (IDARE) by Spielberger and Díaz-Guerrero (1970), although this inventory was originally developed to investigate anxiety phenomena in normal adult subjects, that is, without psychiatric symptoms. It has been demonstrated that this instrument is also...