Cédric Nourry

Effects of a short-term interval training program on physical fitness in prepubertal children.

The aim of this study was to analyze the effects of a 7-week interval-training program on different aspects of physical fitness in children who were 8–11 years old. Forty-six boys and 54 girls (9.7 ± 0.8 years) were divided into an experimental group and a control group. The 2 groups performed selected tests from the European physical fitness test battery before and after training. Training consisted of 2 specific 30-minute sessions per week of short high-intensity, intermittent-running aerobic exercises at velocities ranging from 100–130% of maximal aerobic speed. After training, the experimental group demonstrated a significant improvement in the standing broad jump (9.6%, p < 0.001, F = 12.9) and 20-meter shuttle run (5.4%, p < 0.001, F = 14.4), whereas for the control group, no significant changes were observed. It was concluded that a high-intensity, intermittent-running program improved childrens aerobic performance and explosive strength.

Evidence of Exercise-Induced Arterial Hypoxemia in Prepubescent Trained Children

Exercise-induced arterial hypoxemia (EIAH) is a recognized phenomenon in highly trained adults. Like adult athletes, prepubescent trained children may develop high-level metabolic demand but with a limited lung capacity in comparison with adults. The purpose of this investigation was to search for evidence of EIAH in prepubescent trained children. Twenty-four prepubescent (age: 10.3 ± 0.2 y) trained children (10.0 ± 0.7 h of weekly physical activity) performed pulmonary function tests and a graded maximal exercise test on a cycle ergometer. EIAH was defined as a drop of at least 4% from resting level arterial oxygen saturation (Sao2) measured by pulse oximetry. EIAH was observed in seven children. Forced vital capacity (FVC), ventilatory response to exercise (ΔV˙E/ΔV˙co2), and breathing reserve at maximal exercise were significantly lower, whereas tidal volume relative to FVC was higher in hypoxemic children than in nonhypoxemic children; weekly physical activity and maximal oxygen uptake were similar. Moreover, positive relationships were found between Sao2 at maximal exercise and breathing reserve (r = 0.56; p < 0.05) or volume relative to FVC (r = 0.70; p < 0.01). EIAH may occur in prepubescent trained children with a relatively low maximal oxygen uptake (42 mL · min−1 · kg−1); however, the mechanisms remain unclear and need to be investigated more accurately.

Exercise testing in children: comparison in ventilatory thresholds changes with interval-training.

The aim of this investigation was, first, to examine comparatively the changes in first and second ventilatory thresholds (VT1 and VT2) and, secondly, to compare with peak oxygen uptake (

Effect of high intensity intermittent training on heart rate variability in prepubescent children

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High-intensity intermittent running training improves pulmonary function and alters exercise breathing pattern in children.

) changes following high‐intensity interval training (HIT) in prepubescent children. Eighteen prepubescent children (aged 10.1 ± 0.7 years) performed an incremental exhaustive exercise on a cycle ergometer with pulmonary gas exchange measurements before and after an 8‐week period. During this period, nine children (five girls and four boys; initial

Exercise flow-volume loops in prepubescent aerobically trained children

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Respiratory Muscle Oxygenation Kinetics: Relationships with Breathing Pattern during Exercise

: 39.6 ± 6.0 ml O2 · min−1 · kg−1) took part in a HIT and nine other children (three girls and six boys; initial

Evidence of Ventilatory Constraints in Healthy Exercising Prepubescent Children

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Evidence of exercise-induced O2 arterial desaturation in non-elite sportsmen and sportswomen following high-intensity interval-training.

: 39.8 ± 7.8 ml O2 · min−1 · kg−1), considered as controls, were not trained. After the training period, VT1, VT2, and

Breathing strategy in master athletes and untrained elderly subjects according to the incremental protocol

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