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 7 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 (PF). 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; = 0.033; = 0.50) and PF (14.2 ± 2.5 vs. 12.5 ± 2.0 bpm/shuttle; = 0.015; = 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; < 0.001; = 0.71); differences were also detected for PF (P₁, P₂ and P₃: 172 ± 92, 270 ± 109, and 360 ± 157 s, respectively; < 0.05; = 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.
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| http://dx.doi.org/10.3390/sports7030065 | DOI Listing |
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