Velocità eccentrica

[Matt10]

diversi studi, questo trovato su pubmed

Effect of eccentric contraction velocity on muscle damage in repeated bouts of elbow flexor exercise.

Barroso R, Roschel H, Ugrinowitsch C, Araújo R, Nosaka K, Tricoli V.
Source

School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.

Abstract

Eccentric exercise induces muscle damage, but controversy exists concerning the effect of contraction velocity on the magnitude of muscle damage, and little is known about the effect of contraction velocity on the repeated-bout effect. This study examined slow (60 degrees.s(-1)) and fast (180 degrees.s(-1)) velocity eccentric exercises for changes in indirect markers of muscle damage following 3 exercise bouts that were performed every 2 weeks. Fifteen young men were divided into 2 groups based on the velocity of eccentric exercise: 7 in the Ecc60 (60 degrees.s(-1)) group, and 8 in the Ecc180 (180 degrees.s(-1)) group. The exercise consisted of 30 maximal eccentric contractions of the elbow flexors at each velocity, in which the elbow joint was forcibly extended from 60 degrees to 180 degrees (full extension) on an isokinetic dynamometer. Changes in maximal voluntary isometric contraction strength, range of motion, muscle soreness, and plasma creatine kinase activity before and for 4 days after the exercise were compared in the 2 groups using a mixed-model analysis (groupxboutxtime). No significant differences between groups were evident for changes in any variables following exercise bouts; however, the changes were significantly smaller (p<0.05) after the second and third bouts than after the first bout. These results indicate that the contraction velocity does not influence muscle damage or the repeated-bout effect.


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Authors

Felipe Romano Damas Nogueira¹, Miguel Soares Conceição¹, Felipe Cassaro Vechin¹, Edson Manoel Mendes Junior¹, Guilherme Fernando Couto Rodrigues¹, Marcio Aparecido Fazolin¹, Mara Patricia Traina Chacon-Mikahil¹, Cleiton Augusto Libardi^1
1Laboratory of Exercise Physiology, School of Physical Education, University of Campinas, Campinas, Brazil

Abstract

The velocity at which eccentric exercise is performed may be a factor in the extent of muscular damage. However, studies differ regarding the exercise velocity that promotes greater muscle damage. The purpose of this review was to analyze studies that looked into at least two different eccentric exercise velocities and verified markers of muscle damage. Relevant studies for this review were identified and the methodological quality of each study was calculated based on the Physiotherapy Evidence Database (PEDro) scale. Twelve studies were included herein. The mean PEDro rating was 6.67, ranging from 5 to 7. Seven studies reported that the faster eccentric exercise velocity induced greater muscle damage. Four studies showed no differences between velocities and a single study has indicated a greater magnitude of muscle damage after slow eccentric exercise. Therefore, it seems that fast eccentric exercise may indeed be associated with greater muscle damage even though exercise velocity per se is not the main factor involved in eccentric exercise-induced muscle damage in both animal and human models.





che ne pensate?

[Harvest]

C'è da considerare però che un'eccentrica troppo veloce potrebbe favorire il rischio di infortuni, poi siamo proprio sicuri che maggior danno muscolare sia necessariamente meglio ai fini dell'ipertrofia?

Io direi che la ben rodata eccentrica a tut medio e concentrica esplosiva può andare più che bene per la maggior parte dei casi

[ston]

quoto harvest

[Matt10]

io sono uno che fa la negativa alla Yates per intenderci, è anche vero come avete accennato che aumenta anche il rischio di infortuni, quindi avremmo un maggior danno muscolare ma una possibilità più alta di infortunarsi

[menez]

un'eccentrica veloce potrebbe necessitare di più tempo per il recupero.
Lo studio poi mi pare sia condotto con macchine isocinetiche, macchine tarate per rispettare una certa velocità esecutiva, ben diversa la questione quando si lavora con pesi liberi.
Non a caso molti anni or sono comparve all'orizzonte il MEV ovvero metodo con eccentrica veloce, un lavoro sussidiario di "forza" in cui con carichi sino al 60-65% (se non erro) si stimavano circa 5 o 6 reps in cui volutamente la fase eccentrica era velocizzata in modo da "sbloccare al massimo le resistenze interne del muscolo (ponti actomiosinici)" e giunti al punto di inversione del movimento riprendere con grande potenza e sincronizzazione il sollevamento del bilancere.