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View Full Version : Re: Recording Time for Occupational EMG



Linh Bui
12-04-1998, 05:27 AM
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
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