Range of Motion Clinical Trial
Official title:
Comparison of Four Weeks of Passive Static Stretching and Proprioceptive Neuromuscular Facilitation (PNF) in Musculoskeletal Aspects of the Hamstrings: a Randomized Controlled Trial
This study investigates the influence of two different stretching techniques on the
flexibility of the muscles that are in the posterior thigh, after a training period.
The study will last for six weeks where the volunteers need to go to the lab twice for
evaluation, and for four weeks, three times a week for the application of stretching
training.
Evaluation before and after the training period consists of applying hip and knee
flexibility tests, evaluation of strength, muscle activation and muscle architecture. The
Flexibility tests are: (1) Straight Leg Raise Flexibility Test (SLR), where the volunteer
will be positioned supine on a stretcher. Then the appraiser will perform hip flexion
keeping the knee extended and relaxed foot to the angle at which the person refer discomfort
while the contralateral limb remain firmly leaning on the table; (2) Modified Passive knee
extension (TEJ), where the volunteer will be positioned supine on a stretcher. The assessor
shall determine the hip member to be rated at 90º and perform knee extension to the angle at
which the person refer discomfort. The contralateral limb remain firmly leaning on the
table.
For the evaluation of muscle strength the volunteer had sat on equipment, makes five
repetitions of bending and straightening the knee to familiarize yourself with the equipment
and after will make other five replicates doing maximum strength.
To evaluate the electrical activity will be the depilation of the skin with a razor and
cleaning with an alcohol swab after adhesive electrodes will be placed for collection of
muscle activity, the electrodes do not emit shocks.
The muscle architecture will be assessed via a ultrasound , to its use the use of a water
soluble gel to improve the machine's skin contact is required.
For the intervention, the stretching will be held in both legs, where the volunteer will
remain lying on a stretcher with fixed trunk with velcro straps and the researcher will
carry out the elongation raising the leg drawn to the moment of discomfort the volunteer
will refer and will remain for 30 seconds (s) in case he belongs to passive static
stretching group, if the stretching group of proprioceptive neuromuscular facilitation, will
be in the same position, but before the 30s of stretching, he you will have to push against
during 6s to lower leg against the researcher.
If he belongs to the control group, have only two trips to the laboratory for testing, will
make an initial assessment and after four weeks will return to perform the tests again, in
the period between assessments will not need to go to the lab because it does not make
intervention elongation.
It is possible that there discomfort during flexibility testing, strength testing and
stretching training. After the tests can still experience muscle pain should disappear
within 48 hours. The risks of research are minimal, not exceeding those of a strength
training session and stretching.
n/a
Allocation: Randomized, Intervention Model: Parallel Assignment, Masking: Single Blind (Outcomes Assessor), Primary Purpose: Basic Science
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