Electromyographic fatigue threshold of erector spinae muscle induced by a muscular endurance test in health men

Purpose: To identify the electromyographic fatigue threshold in the erector spinae muscle. Methods: Eight 19 to 24-year-old male volunteers participated in this study, in which surface electrodes were used, as well as a biological signals acquisition module (Lynx) with a sampling frequency of 1000Hz, a 1000 times gain, a 20Hz high pass filter and a 500Hz low pass filter. The test consisted of repeated isometric contractions of the erector spinae muscle in a 45° hip flexion posture, with 30%, 40%, 50% and 60% of the maximum voluntary isometric contraction. Results: A positive correlation of the RMS (root mean square) value as a function of time was found for most of the subjects with 40% (N = 6), 50% (N = 7) and 60% (N = 8) loads of the maximum voluntary isometric contraction. Conclusions: It was concluded, from this study, that the proposed protocol provides evidence, through the electromyographic signal, of the development of fatigue in the erector spinae muscle with loads of 40%, 50% and 60% of the maximum voluntary isometric contraction. The protocol also allows the electromyographic fatigue threshold and its probable applicability in the diagnosis of this phenomenon during repetitive activities to be determined.

Part-time work in Chile: is it precarious employment?: reflections from a gender perspective

Includes bibliography

Building sustainable values in organizations with the support of human resource management: Evidence from one firm considered as the 'best place to work' in Brazil

Researchers and other professionals unanimously agree that companies should become more sustainable, but this will not happen without the support of human resource management. Paradoxically, there is a lack of information on the support human resource management offers to organizational sustainability applied to real cases. Therefore, this research presents a case study on this topic that was carried out in a leading Brazilian company, which is considered as a model and has been selected as 'the best place to work in the country'. The results provide practical examples of how this family company has been working to guarantee an increasingly sustainable performance with the support of human resources, highlighting the achievements and challenges the company has faced. One of the main results indicates that companies seeking to achieve sustainability need the assistance of the human resource field in order to design a communication system which bridges the gap between practices and sustainable values. © 2012 Management Centre for Human Values.

ILPES: nuevas pautas de trabajo 1990-1991 y síntesis de actividades 1988-1989 = ILPES: new guidelines for work in 1990-1991 and summary of activities in 1988-1989

Expone algunas grandes líneas de reflexión del ILPES y su enfoque para renovar la planificación y coordinación de las políticas públicas; informa sobre la orientación actual de las divisiones o unidades técnicas del Instituto, los lineamientos para el trabajo en el próximo bienio, y un resumen de las actividades realizadas en 1988-1989.

Resolución 443(XIX): Programa de trabajo en recursos hídricos = Resolution 443(XIX): Programme of work in the field of water resources = Résolution 443(XIX): Programme de travail en matière de ressources hydriques

Publicado separadamete en cada idioma

Preliminary proposal for an integrated presentation of international statistical work in Latin America and the Caribbean

Includes bibliography

Juventud y trabajo en América Latina = Youth and work in Latin America

Incluye Bibliografía

Dissertação readymadenemtanto da aluna de poesia Rrosé Selavy Duchampignon (work in progress) -: ideograma mental

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)