12/9/2023 0 Comments Women external crunch kicksThis is done by producing movement of the spine, which emphasizes the use of the global musculature. According to Bergmarks 5 description of local and global muscles, this exercise is focused on increasing the capacity of the global muscles. This exercise is designed to specifically isolate and strengthen the abdominal muscles with the possibility to adjust for intensity by increasing or decreasing load on the weight stack. One common abdominal exercise, the crunch, is frequently performed on an exercise machine. Stability may be able to assist in reducing anteriorly directed shear forces on the lumbar spine through the preservation of balanced trunk muscle function and proper body posture. Thus, health professionals advocate strengthening exercises for the abdominal muscles in order to increase stability of this inherently unstable area. 8 Jeng et al 9 described that strengthening the back, legs and abdominal muscles may decrease the occurrence of LBP possibly through subsequent stabilization of the spine. The precise cooperation of motor control and contractile strength of the abdominal musculature provides support of the spine 7 whereas inadequate abdominal muscle strength negatively influences both the stability and controlled mobility of the trunk and spine and have been associated with clinical implications such as low back pain. 5 Local muscles, such as the transversus abdominis and mulifidi, are primarily responsible for force generation that provides inter-segmental stability due to their attachment to the lumbar vertebra, whereas the global muscles, such as rectus abdominis and erector spinae, are primarily involved in spinal movement and control of external forces that are placed upon the spine. 4 The theory of local and global muscles has been used to classify the muscles contributing to core stability. 3 Core stability refers to the ability of core muscles to stabilize the spine whereas core strength denotes the ability of the core musculature to then produce the needed contractile force and intra-abdominal pressure for movement. 1, 2 Stability in this inherently unstable area is obtained through the integration of the passive spinal column restraints, active spinal muscular control, and neurological control. Core muscles must produce sufficient and well coordinated muscle contraction to both support and stabilize the lumbar spine during a variety human movement tasks.
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