View Full Version : Summary responses on [BIOMCH-L] Erector spinae in trunk twisting

unknown user
12-08-2002, 02:43 PM
Dear all,

Thank you for responses on my question on [BIOMCH-L] Erector spinae role
during trunk twisting,
herewith I post the responses, may be useful for others.
(the query posting is on the bottom of this message.)

Best regards,
SWIE,Yuniarto Wijaya
Master Course Student
Univ. of Electro-Communication (UEC), Tokyo JAPAN
Human Engr Research Group - Sakamoto Lab.

1.From: "Joseph Ng"
To: "Yuniarto W Swie" , Sent: Friday, November 08, 2002
2:59 PM
Subject: Re: Erector spinae role during trunk twisting

> Dear Yuniarto
> The following recent article may give you some insights on your results.
> Andersson EA, Grundstrom H, Thorstensson A. Diverging intramuscular
> patterns in back and abdominal muscles during trunk rotation. Spine 2002
Mar 15;
> 27(6): E152-E160.
> With regards
> Joseph Ng


2.From: "Ari J Wilkenfeld"
To: , Sent:
Wednesday, November 13, 2002 12:22 AM
Subject: Re: [BIOMCH-L] Erector spinae role during trunk twisting

> You might want to take a look at what the rectus abdiminus groups are
> during your experiments. Based on their location, they tend to have a
> relatively large impact on axial twisting relative to the erector spinae
> (at least in our simulations).
> Best,
> Ari J Wilkenfeld, PhD

3.From: "Martin Sale"
To: "SWIE Yuniarto Wijaya "
Sent: Friday, November 08, 2002 12:26 PM
Subject: RE: [BIOMCH-L] Erector spinae role during trunk twisting

> Unfortunately I am unable to help with your question, but I am very
interested in what others have to say on it. My thesis was in the movement
of the spine and upper limbs during a twisting and pulling task but I did
not measure the muscular activity during the action. Would you be able to
post a summary of the replies that you receive?
> If you can that would be very much appreciated
> Thanks,
> Marty Sale

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[BIOMCH-L] Erector spinae role during trunk twisting
On 11/7/02 2:11 AM, "SWIE Yuniarto Wijaya $B!! (B" wrote:

> re : Erector spinae role during trunk twisting
> dear experts.
> I am doing experiment about trunk twisting (axial rotation) during upright
> standing posture in static stage,
> and observe the activities of Erector Spinae in L1(upper side) and L5
> side) and in Abdominal muscles.
> Most of previous studies, either in twisting while sitting or standing,
> noted that the Ipsilateral ES are more active than the contralateral.
> While there are also opinion that said ES has no contribution in trunk
> twisting.
> However, most subjects in my experiment gave a different results.
> We observed total power of the EMG of ES muscles, and the total power
> showed that Contralateral ES were active, while Ipsilateral gave almost no
> activity increasing.
> (Opposite result with most past studies).
> There is no such result in all reference we had now.
> According this matter, we would like to have your consideration on the
> possibilities of such resuls.
> Please kindly advise and inform us if any past study gave such kind of
> result.
> I am looking forward to having any opinion and suggestion either from
> biomechanical, anatomical, or ergonomical perspectives.
> Thank you in advance.
> With best regards,
> SWIE Yuniarto W
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