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. 2019 Mar 15;7(3):65.
doi: 10.3390/sports7030065.

Heart Rate Kinetics Response of Pre-Pubertal Children during the Yo-Yo Intermittent Endurance Test-Level 1

João Brito  1 , Luís Fernandes  2 , António Rebelo  3 , Peter Krustrup  4 , Gustavo Silva  5 , José Oliveira  6
Affiliations

Heart Rate Kinetics Response of Pre-Pubertal Children during the Yo-Yo Intermittent Endurance Test-Level 1

João Brito et al. Sports (Basel). .

Abstract

This study analyzed heart rate (HR) kinetics during the Yo-Yo Intermittent Endurance Test-level 1 (Yo-Yo IE1) in children. At the middle of the school year, 107 boys (7⁻10 years old) performed the Yo-Yo IE1. Individual HR curves during the Yo-Yo IE1 were analyzed to detect an inflection point between an initial phase of fast rise in HR, and a second phase in which the rise of HR is slower. The 7th shuttle of the test was established as the inflection point. Engagement with extra-school sports practice was identified. Percentile groups (P₁, P₂ and P₃) were created for body weight and physical fitness data composite (PFcomposite). Differences were found between the slopes of P₁ and P₃ on phase 1 for body weight (12.5 ± 2.7 vs. 13.7 ± 2.0 bpm/shuttle; p = 0.033; d = 0.50) and PFcomposite (14.2 ± 2.5 vs. 12.5 ± 2.0 bpm/shuttle; p = 0.015; d = 0.75). Time spent >95% of peak HR was longer for the children engaged with extra-school sports practice (335 ± 158 vs. 234 ± 124 s; p < 0.001; d = 0.71); differences were also detected for PFcomposite (P₁, P₂ and P₃: 172 ± 92, 270 ± 109, and 360 ± 157 s, respectively; p < 0.05; d = 0.66⁻1.46). This study indicates that physical fitness and body weight influence HR kinetics during the Yo-Yo IE1 in pre-pubertal boys.

Keywords: Yo-Yo IE1; cardiorespiratory fitness; endurance; health; youth.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Absolute heart rate (bpm) during the Yo-Yo IE1 test (n = 107 boys). Vertical dotted line represents the seventh shuttle run.
Figure 2
Figure 2
Heart rate curves for the children engaged with extra-school soccer practice (FE) and children not engaged with any extra-school sports activity (NE).
Figure 3
Figure 3
Heart rate curves for the three weight percentile groups (P1, P2, and P3).
Figure 4
Figure 4
Heart rate curves for the three physical fitness percentile groups (P1, P2, and P3).
See this image and copyright information in PMC

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