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| maps of birding facts, druggy, hip hop, comic strip, radio, blood pressure, quilt kits, health & fitness, diabetes, health & fitness / general, fat joke, tubcat, cheesecakes, aluminum, cat, | In movements where the Rectus Abdominis does Isotonically contract (contracts with movement), it flexes the spine by contracting the entire muscle from origin to insertion. The spine is not significantly flexed during the leg raise. Incidentally, both the spine and hip flexes during the Sit Up and Hip jon spencer blues explosion Raise. See Spot Reduction Myth above. High Repetitions Burn More Fat Myth Performing lighter weight with more repetitions (15-20 reps, 20-30 reps, or 20-50 reps) does not burn more fat or tone (simultaneous decrease of fat and increase muscle) better than a heaver jon spencer blues explosion weight with moderate jon spencer blues explosion repetitions (8-12 reps). Weight training utilizes carbohydrates after the initial ATP and CP stores have been exhausted after the first few seconds of intense muscular contraction. Typically a set's duration is 20 to 30 seconds. |
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| It can be misleading to judge the mechanics of an exercise based upon localized muscular fatigue. The primary muscle used in hip flexion is actually the Iliopsoas, one of health & fitness / general many hip flexors. health & fitness / general The Iliopsoas, indeed, does happen to originate deep below the lower portion of the Rectus Abdominis. During the leg raise the entire abdominal musculature isometrically contracts (contracts with no significant movement) to: Posture the spine health & fitness / general and pelvis Supports the weight of the lower body so the lumbar spine does not hyperextend excessively Maintains optimal biomechanics of the Iliopsoas Hips are kept from prematurely flexing if the lumbar spine and pelvis does not hyperextend excessively Iliopsoas can contract more forcefully in a relatively slight stretched position Bent knee (and hip) situps actually place Iliopsoas in a mechanical disadvantage Counteracts Ilopsoas's pull on spine Many people with weak abdominal muscles are not able to perform hip flexor exercises without acute lower back pain or discomfort The combination of the local muscular fatigue, or a burning sensation from the isometrically contracted abdominal muscles, and from the working hip flexors produces fatigue in the pelvis area which we mistakenly interpret as the lower portion of the Rectus Abdominis being exercised. |
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