Lower Back Pain - The Role Of Hamstrings
Whenever a muscle is tight, you must always consider the balance in strength between the muscles on opposite sides of the joint. In the case with the hamstrings, they act from behind to straighten the hip joint (extend) and bend the knee joint (flex). So the strength of the muscles in the front of the hip that bend the hip and thigh up (flex) and the muscles in the front of the knee that will straighten the knee (extend) are important to balance the action of the hamstrings. Therefore, if the muscles that straighten the hip joint (extensors) are weak, the muscles that bend the hip and thigh upward (flexors) will be automatically stronger. This itself will make the hip extensors (gluteus maximus, adductor magnus) weaker since they will now be stretched beyond their optimal length.
Hamstring muscles do have an effect on straightening the hip, provided the knee is straight. However, when we are sitting down, the hamstring muscles do not have much effect on straightening the hip (extension). The action of the hamstrings will therefore be most prominent for bending the knee. The sitting position with knees bent thus puts the hamstring muscles to become short and tight behind the knee.
The sitting position also puts the rectus femoris and tensor fascia lata muscle at the front of the knee to be stretched across the knee. Since these muscles straighten the knee, they will be stretched beyond optimal length when the knee is in a bent position such as in sitting. This stretch effect is made worse since both these muscles are already shortened when the person sits since these two muscles are responsible for bending the hip also.
The setting for the tightness of the hamstrings at the knee thus stems from weakness of the lower back muscles and the muscles that surround the hip from behind (gluteus maximus, adductor magnus) and from the outer aspect (gluteus medius and tensor fascia lata).
Therefore tightness of the hamstring muscles cannot be accomplished just by stretching the hamstring muscles. Shortening contractions have to be performed to muscles constantly exposed to lengthening contractions. These include perform shortening contractions to the spinal muscles from neck to the base of the spine. At the hip, shortening contractions have to be performed to the gluteus maximus and adductor magnus muscles which have nerve related muscle weakness in the presence of constant exposure to lengthening contractions.
Shortening contractions have to be performed also for the tensor fascia lata and the rectus femoris muscles. Since these muscles have to be selectively activated, the treatment of choice is motor point stimulation using eToims Twitch Relief method. http://technorati.com/tag/hamstring+muscles © 2007 copyright www.stopmusclepain.com hamstrings
Related Tags: lower back pain, knee pain, hamstrings, tightness, spasm
Jennifer Chu, M.D. emeritus professor of Physical Medicine and Rehabilitation, School of Medicine, University of Pennsylvania, pioneered eToims Twitch Relief Method that utilizes surface electrical stimulation to locate motor points (trigger points). The motor points are then stimulated to induce strong local muscle contractions, termed twitches. This results in reduced muscle pain and discomfort in the areas that were stimulated. The involved pain/discomfort-relieving mechanism is thought to include local muscle exercise and stretch effects. eToims Soft Tissue Comfort Center(r) specializes in diagnosis and treatment which ends muscle discomfort and pain.
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