rectus

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Related to Rectus abdominis muscle: Pyramidalis muscle
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During the low intensity tasks, the RMS EMG amplitude of the upper and lower portions of the rectus abdominis muscle during the curl up and leg raise exercises averaged across subjects was 25 [+ or -] 6% of their respective RMS EMG amplitude during the maximum voluntary isometric contractions.
ANOVA only revealed an interaction effect between the task and rectus abdominis muscle portion in the index of fatigue based on the median frequency variable (^(1,9) = 10.
That is, each portion of the rectus abdominis muscle can be partially controlled by the nervous system in an independent way while different portions simultaneously contribute to the same task, acting like a functional unit.
Our second hypothesis was that portions of the rectus abdominis muscle present different patterns of fatigue according to the muscle portions that are more activated in each specific motor task.
A unique finding of this study is that by investigating very controlled tasks (low-intensity and fatiguing isometric abdominal exercises without changing body posture) and employing specific signal processing tools through cross-correlation function and time-frequency analysis, we observed that both common drive and independent control of the rectus abdominis muscle are present during rectus abdominis activation.
We conclude that changes in body position and exercise intensity create different demands for the control of different portions of the rectus abdominis muscle, which corroborates the relevance of exercise variation to modify muscle activation patterns.
Selective activation of the rectus abdominis muscle is possible because this muscle has different portions (which can have different motor fibers in series) which can be innervated by different nerves as well as by a common nerve branch.
Changes in body position and exercise intensity create different demands for the different portions of the rectus abdominis muscle.
Exercise variation seems to be valid to modify the activation patterns of the rectus abdominis muscle.
1995) Rectus abdominis muscle innervation: implications for TRAM flap elevation.