Flexion of the hip joint wills, in the first place, abdominal muscles, which are some of the flexor hips. Iliac abdominal muscles really start well below the lower abdominal muscles. While lifting the legs reduced isometric muscle entire abdominal cavity (i.e. reduced without significant movement) to:
• Stabilize the spine and pelvis
• Support Click the lower body weight in order to avoid hyperextension of the lumbar spine.
• Maintain optimal biomechanics iliac abdominal muscles.
• Prevention of hip flexion when the lumbar spine and pelvis is not a hyper-extension.
Iliac abdominal muscles can contract more powerful position in the relatively easy stretch. Climbs the trunk with knees bent (and hips) leads to the fact that the ilio-abdominal muscles in a mechanically uncomfortable position. Confront the iliac muscle is trying to stretch the spine. Many people with weak abdominal muscles can not perform exercises for the hip flexors without acute pain.
The combination of locally perceived muscle fatigue or "burning feeling" isometrically contracting muscles press and the working muscles, hip flexors leads to a feeling of fatigue in the pelvic area, which we misunderstand and think that we are training the lower abdominal muscles. In movements where the abdominals actually reduced the isotope (i.e., reduced to the movement), there is flexion of the spine due to the fact that the entire muscle contracts in length, ie its origin is close to its end.
In the same foot uphill no significant spinal flexion occurs. By the way, in such exercises as the ups and downs of the pelvis torso flexion occurs as the spine and hip joints. See the myth of local fat burning up.
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