Join Now!      Login

Whole Person Wellness Program Wellness Model
Skip Navigation Links
Health Centers
Key Services
Vitamin D Poll
Are you currently taking a Vitamin D supplement?

 Bodywork Masterclasses: Bodywork Masterclass Series-4 - Learning How to Asses Postural Muscles 

The muscles which shorten are those which have a primarily postural rather than a phasic (active, moving) role and it is possible to learn to conduct, in a short space of time (ten minutes or so) an assessment sequence in which the majority of these can be identified as being either short or normal.

Janda informs us that postural muscles have a tendency to shorten, not only under pathological conditions but often under normal circumstances. Postural muscles are genetically older; they have different physiological, and probably biochemical, qualities compared with phasic muscles which normally exhibit signs of inhibition in response to stress or pathology.

Postural Muscles
Those muscles which shorten in response to stress comprise the following:
Gastrocnemius, soleus, medial hamstrings, short adductors of the thigh, hamstrings,psoas, piriformis, tensor fascia lata, quadratus lumborum, erector spinae muscles, latissimus dorsi, upper trapezius, sternomastoid, levator scapulae, pectoralis major and the flexors of the arms. The scalenes are a borderline set of muscles - which start life as phasic muscles but which can become through overuse/abuse more postural in their function.

It is now becoming clear that the function of a muscle can be modified - which helps to explain some mysteries - for example why the scalenes are sometimes short and sometimes weak and sometimes both, and yet are classified generally as phasic muscles and sometimes as ‘equivocal’ - maybe postural and maybe phasic’.

Lin, writing in The Lancet examined motor muscle physiology in growing children reviewing current understanding of the postural /phasic muscle interaction and reported that, ‘Buller and Eccles have shown that a committed muscle-fibre type could be transformed from slow-twitch to fast-twitch and vice-versa in their cross innervation experiments, confirming that impulse traffic down the nerve conditions the fibre type’.

The implication of this is that if a group of muscle such as the scalenes are dedicated to movement can, through stress such as occurs i constant upper-chest breathing for example, become ‘postural’ in type, and will therefore develop a tendency to shorten if stressed.

Characteristics of Postural and Phasic Muscles:

Postural MusclePhasic muscles
Typeslow twitch - whitefast twitch - red

All muscles comprise both red and white, fast and slow, fibres which produce both postural and phasic functions, however the classification of a muscle into either a ‘postural’ or ‘phasic’ group is made on the basis of their predominant activity, their major functional tendency.

CONTINUED      Previous   1  2  3  4  Next   
 Comments Add your comment 

 About The Author
Leon Chaitow ND, DO, MROA practicing naturopath, osteopath, and acupuncturist in the United Kingdom, with over forty years clinical experience, Chaitow is Editor-in-Chief, of the ...more
 From Our Friends
Popular & Related Products
Popular & Featured Events
Error Reading Event Calendar
Dimensions of Wellness
Wellness, Feeling, dimension!

Home       Wellness       Health A-Z       Alternative Therapies       Wellness Inventory       Wellness Center
Healthy Kitchen       Healthy Woman       Healthy Man       Healthy Child       Healthy Aging       Nutrition Center       Fitness Center
Discount Lab Tests      First Aid      Global Health Calendar      Privacy Policy     Contact Us
Disclaimer: The information provided on HealthWorld Online is for educational purposes only and IS NOT intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek professional medical advice from your physician or other qualified healthcare provider with any questions you may have regarding a medical condition.
Are you ready to embark on a personal wellness journey with our whole person approach?
Learn More/Subscribe
Are you looking to create or enhance a culture of wellness in your organization?
Learn More
Do you want to become a wellness coach?
Learn More
Free Webinar