Muscle Strength Clinical Trial
Official title:
Effectiveness of Muscular Work in Strength Gain of Ischiofemoral and Quadriceps: Relationshionship of Genetic Variants in Improvement of Explosive Force
In the field of sports training and recovery, the work of muscular strength has become the
star theme in terms of its influence on the performance of athletes. In fact, in relation to
the training of the inferior members, the scientific evidence indicates that, to increase the
other two physical qualities conditioned (speed and resistance), it is necessary to work and
to increase the muscular strength.
Randomized intervention trial with sample size of 80 subjects divided into 4 groups (n = 20)
of muscular work: concentric, eccentric, concentric-eccentric and isometric. Ages between
21-23 years.
For all the above, the investigators will study as a main objective analyze what type of
muscular work is most effective in order to improve some variables of the performance of
explosive muscular strength, and to try to determine if that improvement is due, exclusively
to the developed training or to the genetics of the subjects and compare the results obtained
in the variables of vertical jump, power of saint, horizontal jump and speed 60 meters,
before and after the execution of each one of the muscular works dynamic among themselves,
and compared to the muscular work isometric.
In the field of sports training and recovery, the work of muscular strength has become the
star theme in terms of its influence on the performance of athletes. In fact, in relation to
the training of the inferior members, the scientific evidence indicates that, to increase the
other two physical qualities conditioned (speed and resistance), it is necessary to work and
to increase the muscular strength.
To this end, numerous training methods have been developed, in which research and technology
provide new solutions that favor and enhance the muscular work done.
Therefore, in the performance of an athlete this work of force influences, and what this
implies: type of muscular contraction, way of working that contraction, recruitment of the
muscular fiber, and modality of muscular strength developed. But, this performance, it
appears that it can also be influenced by environmental parameters such as diet,
technological support and genetic factors. It has been discovered in the human genome 12
million of polymorphisms, but it is only recorded that some 214 may have influence on
physical qualities, and all of them, the most studied in terms of their influence on sports
performance are: genes Muscular, and more specifically the ACTN3, and vasomotor genes that
affect the production of energy and that intervene in metabolic processes (ACE gene).
- Design: Randomized intervention clinical trial, double blinded.
- Sample: by contrast of hypothesis, a sample size of 80 subjects divided into 4 groups (n
= 20) of muscular work: concentric, eccentric, concentric-eccentric and isometric. They
were randomized using excel software. As criteria of inclusion, subjects that did not
present musculoskeletal lesions in the lower train at the time of the study, which
showed a serious commitment to perform the entire muscle training, which were not
subject to another type of plan Training that could interfere with the results obtained
from the measurement of the study variables, and that would not have been diagnosed with
hypertension.
- Methodology:
The duration of the muscular work was 12 consecutive days, measuring before and after the
same variables indicated below.
The protocol of work was as follows: 4 series of 12 repetitions of the type of muscular
contraction of each group, with one minute of rest between series and series. For the
muscular work isometric: 6 seconds of contraction, with 20 seconds of rest, for a total
working time of 12 minutes.
As a material for muscular work, the muscle brace or Russian belt was used for the three
types of dynamic muscular work and the quadriceps bench for isometric muscular work. Other
variables that were taken into account were: sex, age, weight, height, body mass index, blood
pressure and heart rate.
As explosive force variables were measured: The Jump Power (Sayers formula), the vertical
jump (the Sargent jump test), horizontal jump and speed 60 meters.
Other variables that were taken into account were: sex, age, weight, height, body mass index,
blood pressure and heart rate.
At the end of the 12 days of training was extracted 10 ml of blood to each subject of the
sample, then obtain the DNA analysis of the genotypes of the two genes analyzed.
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