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Et sur le site de la NSCA : Based on current research, it is premature to conclude that the human spine has a limited number of bending cycles. The claim that dynamic flexion exercises are injurious to the spine in otherwise healthy individuals remains highly speculative and is based largely on the extrapolation of in vitro animal data that is of questionable relevance to in vivo human spinal biomechanics. Although it appears that a large number of continuous bending cycles may ultimately have a detrimental effect on spinal tissues, no evidence exists that a low-volume strength-based exercise routine that includes dynamic spinal flexion movements will hasten the onset of disc degeneration, and a case can be made that such exercises may in fact produce a beneficial effect in terms of disc health.
To date, the authors are not aware of any study that has investigated the effects of spinal flexion exercise on human spines in vivo.
Further research is needed to evaluate both the acute and chronic effects of dynamic spinal flexion exercises in human subjects in vivo so that more definitive conclusions can be drawn on the topic.
This research should include magnetic resonance imaging of intervertebral discs to assess disc health preceding and following human spinal flexion protocols of varying loads, repetitions, tempos, and ranges of motion.
It is hoped that this article will serve to spark new research in this area. With respect to program design, basic core strength and endurance will be realized through performance of most nonmachine-based exercises such as squats, rows, deadlifts, and push-ups. That said, targeted core exercises may serve to enhance sports performance, functional capacity, and physique aesthetics. A variety of abdominal exercises are necessary to sufficiently work the abdominal musculature, and these exercises will differ based on training objectives Variety in spinal loading is associated with lower risk of spinal pathology A balanced multiplanar approach to core training that incorporates a combination of isometric and dynamic exercises is warranted to prevent any particular spinal segment from accentuated stress and to ensure proper spine-stabilizing biomechanics.
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