Koralsztein jean pierre

• Medical Doctor at sport center medicine paris france

Aims and Objectives: The present study aimed to examine the effects of 6 months of unsupervised training, walking at maximal fat oxidation (FATmax), on body composition and cardiovascular function at rest and exercise, in middle aged obese subjects. Methods and results: A single group with pre-test/post-test study design was conducted. Eighteen obe...

In the same way that most of the robots and advanced mobile machines are designed to optimize their energy consumption or the smoothness of their motions, it has been demonstrated that competitive runners tend to exhibit smoother strides than recreational runners during running and fast walking. Here, we describe the statistical mechanics of Humans...

Results: his bodyweight and lean body mass did not change, while his ⩒O2max increased (31 to 35 ml.kg(-1)min(-1); +13%). Peak power output increased from 90 to 125 W (+39 %), mainly due to increasing the maximal pedaling frequency (69 to 90 rpm; +30%). Maximal heart rate did not change (134 to 137 bpm) in contrast to the maximal ventilation (57 to...

Previous studies showed an interaction between the response over time of oxygen uptake (V O2), the drift of heart rate (HR) and the drop of stroke volume (SV) during constant workload exercise. Objective: To compare the responses of oxygen uptake (V O2) and stroke volume (SV) in exhaustive exercises performed at a constant workload or at heart rate...

High value of maximal oxygen update (VO2max) was generally associated with large stroke volume (SV) in trained subjects but severe exercise may induce VO2max attainment with a decline of SV value. Objective: To examine the effects of interval training at the power associated with SVmax (IT@pSVmax) on the patterns of SV and 2. Methods: 8 trained a...

The purpose of this study was to examine whether the heart rate (HR) deflection point (HRDP) in the HR-power relationship is concomitant with the maximal stroke volume (SV(max)) value achievement in endurance-trained subjects. Twenty-two international male cyclists (30.3 +/- 7.3 yr, 179.7 +/- 7.2 cm, 71.3 +/- 5.5 kg) undertook a graded cycling exer...

The purpose of this study was to determine whether the maximal oxygen uptake (VO2max) is attained with the same central and peripheral factors according to the exercise intensity. Nine well-trained males performed an incremental exercise test on a cycle ergometer to determine the maximal power associated with VO2max (pVO2max) and maximal cardiac ou...

LEPRETRE, P.-M., J.-P. KORALSZTEIN, and V. L. BILLAT. Effect of Exercise Intensity on Relationship between V̇O2max Cardiac Output. Med. Sci. Sports Exerc., Vol. 36, No. 8, pp. 1357-1363, 2004. Purpose: The purpose of this study was to determine whether the maximal oxygen uptake (V̇O2max) is attained with the same central and peripheral factors acco...

The purpose of this study was to estimate the difference between potential and kinetic mechanical powers in running (Pke, Ppe) calculated from the center of mass and one anatomic point of the body located on the lower part of the runner’s back, the “lumbar point.” Six runners undertook a treadmill run at constant velocity and were filmed individual...

Introduction Except the marathon, all the races are run at speeds above the " critical velocity " which is the horizontal asymptote of the velocity-time relationship (Morton R. 1990). Variation of speed equal to 5% has been reported in the last three world records for 5-km and 10-km distance running (Billat et al. 2001). Therefore the exploration o...

To examine whether differences in heart rate variability (HRV) can distinguish sub- from supra-ventilatory-threshold exercise and whether the exercise duration at supra-threshold intensity alters cardiorespiratory synchronization. Beat-to-beat RR interval, VO2, VCO2, VE, and blood lactate concentration of 11 healthy well-trained young subjects were...

The maximal lactate steady state (MLSS) is defined as the highest blood lactate concentration (MLSSc) and work load (MLSSw) that can be maintained over time without a continual blood lactate accumulation. A close relationship between endurance sport performance and MLSSw has been reported and the average velocity over a marathon is just below MLSSw...

The maximal lactate steady state (MLSS) is defined as the highest blood lactate concentration (MLSSc) and work load (MLSSw) that can be maintained over time without a continual blood lactate accumulation. A close relationship between endurance sport performance and MLSSw has been reported and the average velocity over a marathon is just below MLSSw...

Interval training consisting of brief high intensity repetitive runs (30 s) alternating with periods of complete rest (30 s) has been reported to be efficient in improving maximal oxygen uptake (V˙O2max) and to be tolerated well even by untrained persons. However, these studies have not investigated the effects of the time spent at V˙O2max which co...

Interval training at V˙O2max: effects on aerobic performance and overtraining markers. Med. Sci. Sports Exerc., Vol. 31, No. 1, pp. 156-163, 1999. Purpose: Between inefficient training and overtraining, an appropriate training stimulus (in terms of intensity and duration) has to be determined in accordance with individual capacities. Interval train...

Purpose: Between inefficient training and overtraining, an appropriate training stimulus (in terms of intensity and duration) has to be determined in accordance with individual capacities. Interval training at the minimal velocity associated with VO 2max (vVO 2max ) allows an athlete to run for as long as possible at VO 2max . Nevertheless, we don'...

Une publication recente (Billat et al., 1994a) a montre la reproductibilite et la grande variabilite interindividuelle du temps limite (Tlim) a la vitesse aerobie maximale (VAM: vitesse minimale sollicitant VO 2 max) chez 8 coureurs de fond. La presente etude avait en consequence pour but d'examiner si cette variabilite etait comparable a celle d'u...