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**Chapter 3** 

© 2012 Marson, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use,

distribution, and reproduction in any medium, provided the original work is properly cited.

© 2012 Marson, licensee InTech. This is a paper distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

**Relationships Between Surface** 

**Isometric Ramp Contractions** 

Additional information is available at the end of the chapter

surface electromyography (sEMG) [7,8,9].

the time, hence the term static contraction [6,11].

contraction required [5,10].

[12,13,14].

Runer Augusto Marson

http://dx.doi.org/10.5772/48819

**1. Introduction** 

**Electromyography and Strength During** 

From the many joints exposed to muscle-skeletal injuries, the knee joint is the one that more suffers consuming in the daily life, for both athletes and non-athletes [1], once for the maintenance of the corporal stability, it is necessary for the muscles of this joint to be the strongest as possible [2]. Such strengthening may be obtained through an isometric force

The hamstrings muscle group is objeto de estudo devido seu papel como músculo biarticular, bem como a sua função na insuficiência mecânica [6]. This group is composed of the *semitendinosus* (ST), *semimembranosus* (SM) and *biceps femoris caput longum* (BFCL) all of which are active during knee flexion. The activity of these muscles is often examined using

The efficiency of muscle contraction depends on factors such as the fiber cross-section, the number of muscle fibers, the degree of fiber stretching, the traction angle and the type of

Isometric exercise is one of several forms of exercise used to develop muscle force in humans. Isometric contraction occurs without any appreciable change in muscle length, such that although there is tension in the muscle there is little muscle movement for most of

A important fact that be associated with a force output is the neuromuscular fatigue. This can under certain conditions be reflected in a decreased performance and/or the failure point at wich the muscle is no longer able to sustain the requeried force or work output level

training [3], which range from numbers of repetitions up to weekly frequencies [4,5].

Wöhrle JC, Behrens S, Mielke O, Hennerici MG (2004). Early motor evoked potentials in acute stroke: adjunctive measure to MRI for assessment of prognosis in acute stroke within 6 hours. *Cerebrovasc Dis*, 18(2), 130-134.

**Chapter 3** 
