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On Tue, 24 Nov 1998, Richard Wells wrote:
> Hi,
> EMG can be used for a number of purposes in occupational settings
> including determining the activation (RMS) distibution of activation
> (APDF), rest time (EMG "Gaps") or fatigue (MnPF/MdPF or its change over
> time). My question is:
>
> "How long need one record surface EMG for a given measurement precision"?
>
> The literature seems to indicate three types of study;
> 1)Isometric, isotonic contractions. Time needed < 1sec?
> 2)Cyclic "stereotypic motion", e.g. gait, grasp. Time needed eg. 1-10
> cycles, strides or repetitions?
> 3)"Real work" with multiple activities and tasks. Time defined
> using sampling methodology or full day recording?
>
> Situation 2) probably corresponds to many laboratory simulations of
> occuaptional activity, often with multiple conditions. The answer
> also seems to depend on the EMG variable of interest.
>
> Our review of literature found that very few reserchers give reasons for
> the time of recording and/or the number of trials used. The few exceptions
> are in the gait literature. What is your experience and what documentation
> are you aware of?
> Thank you
> R
>
>
> __________________________________________________ _______________________
> Richard Wells | Of the butchers and floorsmen...
> Department of Kinesiology | their knuckles were swollen so that
> Faculty of Applied Health Sciences | their fingers spread out like a fan..
> University of Waterloo, Waterloo, | There were the beef luggers,... and
> Ontario, CANADA N2L 3G1 | that wore out the most powerful men
> . | in a few years.
> Voice: (519) 888-4567 Ext 3069 |
> Fax: (519) 746-6776 | The Jungle by Upton Sinclair 1905
> E-mail: wells@healthy.uwaterloo.ca | (Set in Chicago Meatpacking plants)
> http://www.ahs.uwaterloo.ca/~wells/
> __________________________________________________ ______________________
>
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> To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
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> ---------------------------------------------------------------
>
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> Hi,
> EMG can be used for a number of purposes in occupational settings
> including determining the activation (RMS) distibution of activation
> (APDF), rest time (EMG "Gaps") or fatigue (MnPF/MdPF or its change over
> time). My question is:
>
> "How long need one record surface EMG for a given measurement precision"?
>
> The literature seems to indicate three types of study;
> 1)Isometric, isotonic contractions. Time needed < 1sec?
> 2)Cyclic "stereotypic motion", e.g. gait, grasp. Time needed eg. 1-10
> cycles, strides or repetitions?
> 3)"Real work" with multiple activities and tasks. Time defined
> using sampling methodology or full day recording?
>
> Situation 2) probably corresponds to many laboratory simulations of
> occuaptional activity, often with multiple conditions. The answer
> also seems to depend on the EMG variable of interest.
>
> Our review of literature found that very few reserchers give reasons for
> the time of recording and/or the number of trials used. The few exceptions
> are in the gait literature. What is your experience and what documentation
> are you aware of?
> Thank you
> R
>
>
> __________________________________________________ _______________________
> Richard Wells | Of the butchers and floorsmen...
> Department of Kinesiology | their knuckles were swollen so that
> Faculty of Applied Health Sciences | their fingers spread out like a fan..
> University of Waterloo, Waterloo, | There were the beef luggers,... and
> Ontario, CANADA N2L 3G1 | that wore out the most powerful men
> . | in a few years.
> Voice: (519) 888-4567 Ext 3069 |
> Fax: (519) 746-6776 | The Jungle by Upton Sinclair 1905
> E-mail: wells@healthy.uwaterloo.ca | (Set in Chicago Meatpacking plants)
> http://www.ahs.uwaterloo.ca/~wells/
> __________________________________________________ ______________________
>
> ---------------------------------------------------------------
> To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
> For information and archives: http://isb.ri.ccf.org/biomch-l
> ---------------------------------------------------------------
>
---------------------------------------------------------------
To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
For information and archives: http://isb.ri.ccf.org/biomch-l
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