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View Full Version : Re: When lifting a low-lying load is it better to look straightforwards or tuck your chin in?



dhrassoulian64
07-09-2006, 06:15 PM
David,

Although this may be a speculation but in a discussion with a colleague I
understand that the spinal cord and all of the nerves (in particular) the
major nerves such as the sciatic nerve can be thought of as a rope that is
subject to a tensile stress when we bend down for example. Whilst the head
pivots over the neck if it is moved forward it can result in additional
stress of the spinal cord (which would already be under tension due to the
bending posture adopted). This can be through further stretching of the
cord itself as well as generating more of a curvature at the cervical
segment of the spine thereby increasing the tension on the cord. Therefore
I suppose looking forward or even looking up (causing the head to move
back) can reduce the tension or at least avoid any additional burden on the
cord and the nerves.

Food for thought I think

Hamid


--
Dr. H Rassoulian MIPEM, CSci, CEng, FIMechE, CS
Head of Clinical Bioengineering
Dept. Medical Physics & Bioengineering
Southampton General Hospital
Tremona Rd.
Southampton SO16 6YD

Tel: +44 (0)23 80 79 69 45
Fax: +44 (0)23 80 79 41 17
Alternative Email:
Hamid.Rassoulian@suht.swest.nhs.uk


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Quoting "McFarlane, David" :

> In May 2005 I initiated a discussion on the Ergoweb list server
> concerning whether training in lifting techniques be made more
> effective. On 23 Oct 2005 Mike Papakyriakou of York University asked
> whether it is really helpful to "look forward" when you lift to help
> keep the spine "neutral"; is that a meaningful or useful concept?
> He referred to some lifting instructions he had seen (such as those
> issued by the U.S. Army Center For Health Promotion And Preventive
> Medicine) that advised you to "look forward" when you lift whereas
> others advised you to tuck your chin in. Nobody replied (or at least not
> publicly).
> I seem to remember that Sedgewick and Gormley (1998) used to say
> something similar but that was probably due to the fact that it helped
> weightlifters to do well (i.e. probably it was to stop their chins from
> hitting the bar). However, I do not recollect the details.
>
> So the question remains; when lifting a low-lying load is it better to
> look forward or tuck your chin in? Or doesn't it really matter?
> Regards,
> David McFarlane
> Ergonomist, WorkCover Authority
> New South Wales, Australia
> Reference
> A. Sedgwick and J. Gormley, (1998), "Training for lifting; an unresolved
> ergonomic issue?", Appl Ergon. 29, (5): 395-8.
> Disclaimer
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> endorses the product or the brand.
>
>
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