First periodic portal editorial report, deliverable 19 of caENTI, project funded under FP6 research program of the European Union

deliverable 19 of caENT

Second periodic portal editorial report, deliverable 20 of caENTI, project funded under FP6 research program of the European Union

deliverable 20 of caENT

Final portal editorial report, deliverable 21 of caENTI, project funded under FP6 research program of the European Union.

deliverable 21 of caENT

Nouvel ergomètre de terrain pour mesurer de manière reproductible la force maximale et le taux de développement de la force des ischio-jambiers

International audienceObjectives. — Hamstring strain injuries are common in sprint-based activities and multifacto- rial. One of the main risk factors is the deficit of hamstring eccentric strength, which is not easily assessed in field conditions. Therefore, a new ergometer named ‘‘Hamtech’’ has been developed to accurately and practically assess hamstring force output. The aim of this study was to test the reproducibility of this novel ergometer during maximal isometric and eccentric contractions.Materials and methods. — Thirteen soccer players (age: 20.7 ± 1.6 years; stature: 178.1±4.9cm; body mass: 72.1±6.3kg) were recruited. After two familiarization ses- sions, hamstring force production was recorded during maximal isometric and eccentric contractions using the Hamtech. The coefficients of variations and intra-class correlations coefficients were used to quantify reproducibility.Results. — This ergometer allows reproducible measurements of unilateral (isomet- ric+eccentric) and bilateral (eccentric) peak force. However, the reproducibility was moderate to good (unilateral) and poor (bilateral) for the knee angle at the eccentric peak force. A good reproducibility was observed for the rate of force development at 200-ms during maximal isometric contractions. The Hamtech offers a simple and reproducible solution to measure hamstring force production during isometric and eccentric contractions. The use of unilateral hamstring muscles at long muscular length might provide a valuable alternative to the classical bilateral condition to assess the hamstring force production.Objectifs : Les blessures aux ischio-jambiers sont fréquentes dans les activités basées sur le sprint et sont multifactorielles. L'un des principaux facteurs de risque est le déficit de force excentrique des ischio-jambiers, qui n'est pas facile à évaluer sur le terrain. Par conséquent, un nouvel ergomètre appelé "Hamtech" a été développé pour évaluer de manière précise et pratique, la force des ischio-jambiers. L'objectif de cette étude était de tester la reproductibilité de ce nouvel ergomètre lors de contractions isométriques et excentriques maximales