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Dose-Response Relationship Between Internal Training Load and Changes in Performance During the Preseason in Youth Soccer Players

Figueiredo, Diogo H.1; Figueiredo, Diego H.1; Moreira, Alexandre2; Gonçalves, Helcio R.3; Dourado, Antonio C.3

The Journal of Strength & Conditioning Research: April 16, 2019 - Volume Publish Ahead of Print - Issue - p
doi: 10.1519/JSC.0000000000003126
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Figueiredo, DH, Figueiredo, DH, Moreira, A, Gonçalves, HR, and Dourado, AC. Dose-response relationship between internal training load and changes in performance during the preseason in youth soccer players. J Strength Cond Res XX(X): 000–000, 2019—The aim of this study was to describe training intensity distribution based on the session rating of perceived exertion (sRPE) and heart rate (HR) methods and examine the dose-response relation between internal training load (ITL) and change in performance of 16 youth soccer players (mean ± SD age: 18.75 ± 0.68 years, height: 175.3 ± 5.5 cm, body mass: 68.7 ± 6.5 kg, and body fat: 10.7 ± 1.2%) belonging to a Brazilian first division team during a 3-week preseason. The sRPE and HR data were registered daily to calculate the ITL and the training intensity distribution, in 3 intensity zones (low, moderate, and high). The Yo-yo Intermittent Recovery Level 1 (Yo-yo IR1) was evaluated before and after experimental period. The total time spent in the low-intensity zone (HR method) was greater (p < 0.01) compared with the moderate- and high-intensity zones. No difference was observed between training intensity zones determined by the sRPE method (p > 0.05). Negative correlations were observed between weekly mean sRPE-TL (r = −0.69), Edward's-TL (r = −0.50), and change in Yo-yo IR1. Linear regression indicated that weekly mean sRPE-TL (F1;14 = 13.3; p < 0.01) and Edward's-TL (F1;14 = 4.8; p < 0.05) predicted 48.7 and 25.5% of the variance in performance change, respectively. Stepwise linear regression revealed that these 2-predictor variables (F2;13 = 18.9; p < 0.001) explained 74.5% of the variance in performance change. The results suggest that the sRPE and HR methods cannot be used interchangeably to determine training intensity distribution. Moreover, sRPE-TL seems to be more effective than the HR-based TL method to predict changes in performance in youth soccer players.

1Department of Physical Education, State University of Maringa, Maringa, Brazil;

2Department of Sport, School of Physical Education and Sport, University of Sao Paulo, Sao Paulo, Brazil; and

3Department of Physical Education, State University of Londrina, Londrina, Brazil

Address correspondence to Diogo H. Figueiredo, diogohfigueiredo@hotmail.com.

Copyright © 2019 by the National Strength & Conditioning Association.