This is not a question that I have done a literature search on, but I have some questions and comments that may help you refine your current question.

1.  Is there an acute change in muscle activity depending on the position (more or less kyphotic) assumed by an individual?  This is a question that could be easily addressed with electromyography.

2. Is there a difference in EMG activity when comparing individuals with a kyphotic posture to those without a kyphotic posture?  This is a much more difficult question because you need to normalize the amplitude of the EMG signal in order to compare across subjects.  There are multiple ways to do this, but all have drawbacks.

3.  Does EMG activity change over time as an individual develops a kyphotic posture?  This has the obvious complications of having to follow subjects over many years, and also requires some form of EMG amplitude normalization to compare across different measurement sessions

Given the considerations above, I doubt that there is any literature addressing questions 2 or 3, and it wouldn't surprise me if #1 had never been addressed, at least in a defensible manner  If you are interested in addressing question #1, I'd be happy to discuss the study design with you.

Best regards,

Greg Karst   [email protected]

Dear Gregory Mark Karst

Thank you for your helpful comments. Actually I've been interested in question 2 but as you mentioned it is a much more difficult study and I was hopeful there is any literature that can help me. But I'd be happy if you tell me more about question 1.

Would you please guide me and tell me your idea about compare EMG outputs before and after a targeted exercise protocol in subjects with postural hyperkyphosis? I mean, we compare not only the alignment of subjects but also some EMG outputs in pretest and post test for finding the effectiveness of our protocol.

Beast regards

MOhammad bayat

Dear Mohammad Bayat,

kyphotic position influenz the activity of the sympatic trunc.

So bloodflow in the periph. nervous system can be reduced up to 60%

best regards

Axel steilen

Dear Mohammad,

Gregory gave a great response.  My addtional comment is: What is your hypothesis ?  What muscles spcifically are you talking about and why do you think they would present with altered EMG ( and when for specific tasks ?, or at rest ??)  Are you talking about extreme pathologic kyphosis ,or just people with generalized poor posture ? You need to develop your question further and  have a biologically plausable rationale to support your research question.