Hi Zeinab, try to check the Perotto's anatomical guide for the electromyographer ... It provides good information about the limbs and trunk muscles, specially their anatomical position in addition to the location of the surface EMG electrode and the test maneuver required for the appropriate placement ... https://www.scribd.com/doc/78863866/Anatomical-Guide-for-Electromyographer ... All the best

Check out ABC of EMG by Konrad:

https://hermanwallace.com/download/The_ABC_of_EMG_by_Peter_Konrad.pdf

Hi,

Check the muscle moment arm of each group of erector spine muscle in standing Position. Using the measure of moment arm try to identify the which part of muscle is more active or produces more force.

Hi zeinab

You can find it from the below link which is based on the SENIAM protocol

I hope helpful.

کمک دیگه ای هم باشه من دانشگاه علوم بهزیستی روبروتون هستم در خدمتم. موفق باشید

http://seniam.org/sensor_location.htm

Good question,

You have had some good resources provided by others and a recommendation regarding muscles having different moment arm potentials.

Trunk muscles are unique for even the superficial ones are innervated by multiple levels of the spinal nerves. So they can have variable activity (temporal onset etc.) superior and to inferior sites. They may also vary in their relative maximum amplitude. However, to characterize postural control you probably do want a good representation of muscle fibres that can produce moments in different planes, and then place electrodes with sufficient spacing to suggest they are sampling at least unique activity.

Work from our lab (Hubley-Kozey & Butler, 2012; Quirk & Hubley-Kozey 2015 (Human Movement Science)) show sites of the superficial lumbar multifidus, illiocostalis, and longissimus appear to have specific activity to different external moments. Using the protocol in those papers I would recommend a reduced set of the:

5 spinous process of the lumbar spine 2 cm lateral (L52) Multifidus

3rd spinous process of the lumbar spine 6 cm lateral (L36) Longissimus

1st spinous process of the lumbar spine 3cm lateral (L33) Illiocostalis

Guidelines to palpate the above sites are as follows. Identify either the L4/L5 space or the T12 spinous process (palpate along the bottom rib). Then identify the relative spinous process from there. To scale the sites to your participants the L36 is a guideline. Have the participant perform a prone back extension and you can feel in the lateral border of the longissimus in the posterior space between the bottom rib/ top of the pelvis. You can use that lateral border as a reference to if you need to move medial or lateral to the 6cm guideline.

Another commonly used site would be the latissimus dorsi which attaches to the lumbar fascia. The site referred by McGill and colleagues (for example Vera-Garcia et al 2006, JEK). Approximately located lateral to the 9th spinous process of the thoracic spine over the muscle belly.

Hopefully that is helpful for a good subset of back extensor sites.

Cheers,

Adam

good question...

I also happen to have a little knowledge about the same question, so permission to learn too, thanks all