Hello and welcome to this week’s edition of HealthBeat, Chiropractic OnLine Today’s Health, News and Informational Podcast.
In this week’s news: We’ll Be Looking At –
- Exercises for the Torso in Standing Posture
- And Finally, a Story about Abdominal muscle activation increasing lumbar spinal stability
For HealthBeat …. This is Dr. Todd Eglow!
Welcome to HealthBeat Podcast #555 recorded July 1, 2016.
HealthBeat is Chiropractic OnLine Today’s radio program, providing current news and commentary about Chiropractic and Health.
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Exercises for the Torso in Standing Posture
The purpose of a study published in the Journal of Strength and Conditioning Research, was to document the muscle activity, spine motion, spine load, and stiffness during several movement-based or “functional” exercises and to assess the effect of technique change.
Exercises included a walkout in the sagittal plane that compared an upright form against a wall with those performed on the floor, overhead cable pushes, lateral cable walkouts, the good morning exercise, and the bowler’s squat.
Generally, muscle activation levels were quite modest even though the tasks were quite strenuous in many cases. Even though similar joint moments were required in different exercises, the pattern of activity between muscles was different.
Abdominal bracing increased spine stiffness at the expense of more spine load. Thus, muscle activity seems to be constrained in “functional” exercises.
Therefore, maximal muscle activity is observed during single-plane tasks, but muscle activation levels were constrained during functional tasks. Thus, strength training muscles may not help in “functional multiplanar” tasks.
These data can be used to assist decisions regarding the selection of exercises, specifically choices regarding the starting challenge, progression, exercise form, and possibly corrective technique for those who have spine concerns, or those simply looking for performance enhancement.
As always, discuss all Exercise Recommendations with your Qualified Health Care Provider.
Surf to our Show Notes for Links – http://journals.lww.com/nsca-jscr/pages/articleviewer.aspx?year=2009&issue=03000&article=00015&type=abstract
Abdominal muscle activation increases lumbar spinal stability
Antagonistic activation of abdominal muscles and increased intra-abdominal pressure are associated with both spinal unloading and spinal stabilization.
Rehabilitation regimens have been proposed to improve spinal stability via selective recruitment of certain trunk muscle groups. This biomechanical analytical study, published in the journal Clinical Biomechanics, addressed whether lumbar spinal stability is increased by such selective activation.
Spinal stability increased by an average factor of 1.8 with doubling of intra-abdominal pressure. Forcing at least 10% activation of obliques or transversus abdominis muscles increased stability slightly for efforts other than flexion, but forcing at least 20% activation generally did not produce further increase in stability. Forced activation of rectus abdominis did not increase stability.
The study concluded that based on analytical predictions, the degree of stability was not substantially influenced by selective forcing of muscle activation.
This casts doubt on the supposed mechanism of action of specific abdominal muscle exercise regimens that have been proposed for low back pain rehabilitation.
Surf to our Show Notes for Links – http://www.ncbi.nlm.nih.gov/pubmed/21571410
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For Chiropractic OnLine Today’s HealthBeat, This has been
Dr. Todd Eglow.