2,875 research outputs found

    Morphological and physiological profile of elite basketball players in Belgium

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    PURPOSE: The present study aimed to gain insight into the physiological profile of elite basketball players in Belgium in relation to their position on the field. METHODS: The group consisted of 144 players, divided into 5 groups according to position (point guards [PG], shooting guards [SG], small forwards [SF], power forwards [PF] and centers [C]). The anthropometrics were measured and the subjects underwent fitness tests (incremental running test, 10m-sprint,5x10m,Squat and Counter Movement Jump, isokinetic test) to obtain insight into endurance, speed, agility and power. The parameters of these tests were compared among the different positions by means of one-way variance analysis (MANOVA). Tukey post hoc-tests where performed in case of a significant MANOVA. RESULTS: It was observed that C were taller, heavier and had a higher body fat percentage compared to PG and SG. For the anaerobic sprint test C were slower compared to the other positions. For the 5x10m the PG and SG were faster than SF and PF. For the jump test C displayed a significantly lower absolute performance compared to the other positions. PG and SG had a higher VO2peak and speed at the anaerobic threshold compared to PF and C. The isokinetic strength test showed that the quadriceps muscle group of C could exert a higher torque during the knee extension compared to the other positions. CONCLUSIONS: The present study showed that the physiological profile of elite players in the Belgian first division differs among the position on the field. More specific, guards were characterized by a high endurance, speed and agility, whereas centers and power forwards showed a higher muscular strength compared to the other positions

    Development of an upwind sailing ergometer

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    Purpose: To develop a sailing ergometer that accurately simulates upwind sailing exercise. Methods: A sailing ergometer that measures roll moment accompanied by a biofeedback system that allows imposing a certain quasi-isometric upwind sailing protocol (ie, 18 bouts of 90-s hiking at constantly varying hiking intensity interspersed with 10 s to tack) was developed. Ten male high-level Laser sailors performed an incremental cycling test (ICT; ie, step protocol at 80W + 40 W/3 min) and an upwind sailing test (UST). During both, heart rate (HR), oxygen uptake (VO2), ventilation (V-E), respiratory-exchange ratio, and rating of perceived exertion were measured. During UST, also the difference between the required and produced hiking moment (HM) was calculated as error score (ES). HR, VO2, and V-E were calculated relative to their peak values determined during ICT. After UST, the subjects were questioned about their opinion on the resemblance between this UST and real-time upwind sailing. Results: An average HM of 89.0% +/- 2.2% HMmax and an average ES of 4.1% +/- 1.8% HMmax were found. Mean HR, VO2, and V-E were, respectively, 80% +/- 4% HRpeak, 39.5% +/- 4.5% VO2peak, and 30.3% +/- 3.7% V-Epeak. Both HM and cardiorespiratory values appear to be largely comparable to literature reports during on-water upwind sailing. Moreover, the subjects gave the upwind sailing ergometer a positive resemblance score. Conclusions: Results suggest that this ergometer accurately simulates on-water upwind sailing exercise. As such, this ergometer could be a great help in performance diagnostics and training follow-up

    Convergence Analysis of an Online Approach to Parameter Estimation Problems Based on Binary Noisy Observations

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    International audienceThe convergence analysis of an online system identification method based on binary-quantized observations is presented in this paper. This recursive algorithm can be applied in the case of finite impulse response (FIR) systems and exhibits low computational complexity as well as low storage requirement. This method, whose practical requirement is a simple 1-bit quantizer, implies low power consumption and minimal silicon area, and is consequently well-adapted to the test of microfabricated devices. The convergence in the mean of the method is studied in the presence of measurement noise at the input of the quantizer. In particular, a lower bound of the correlation coe cient between the nominal and the estimated system parameters is found. Some simulation results are then given in order to illustrate this result and the assumptions necessary for its derivation are discusse

    Are RCP and critical power equivalent : the issue of mean response time

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