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Abstract
This study aims to compare the performance values of U-16 development league football players. The research was carried out according to the experimental research model. A total of 25 football players of a super league football team (age: 16, height: 170,36±7,31cm, weight: 56,89±8,88kg), all competing in the U-16 elite development league, participated voluntarily. The players wear Polar watches on the grass football field; Yo-Yo Intermittent Recovery Level 1 test was applied and aerobic endurance levels, maximal heart rate, and heart rate recovery times were measured. Tests and measurements were applied 1 week before the start of the league. After the first test, the competition period general training program was applied for 9 weeks, 4 days a week, and after that, the same tests and measurements were carried out again. After a 9-week competition training program, there were statistically significant differences in aerobic endurance levels and heart rate recovery times at the 1st minute (p<0.01), no statistically significant differences were found in maximal heart rate and heart rate recovery times at the 2nd minute (p>0.01). In conclusion, it can be said that the 9-week training program applied during the competition period is effective on the aerobic endurance level and heart rate recovery time in the 1st minute.
 
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Highlights
Development leagues constitute the basic structure of our country's football
When we look at the success of Turkish teams, football players, and the national team in European and world tournaments, we see how far we are behind compared to other countries
To make the world talk about Turkish football and football players in the future, we think that the group that needs to be studied the most in terms of psychological, sociological, and performance science, is the development leagues
Summary
Development leagues constitute the basic structure of our country's football. In football, the development leagues are the infrastructure of all teams from the amateur league to the super league. While parasympathetic has a decelerating effect, sympathetic increases the heart rate (Ateş, 2014; Berntson et al, 1997; Shaffer and Ginsberg, 2017) Heart rate analysis during exercise and recovery informs us of cardiac autonomic recovery (Javorka et al, 2002). Heart rate parallels this autonomic recovery, that is, heart rate shows a great decrease (Imai et al, 1994). A gradual slowdown in metabolic activities and a decrease in heart rate begin (Peçanha et al, 2016) Conditions such as training, age, gender, nutrition, genetic structure, etc. With the development of the energy system desired, the performance capacity will be increased (Açıkada, 1990)
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