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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/
__________________________________________________ ______________________
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For information and archives: http://isb.ri.ccf.org/biomch-l
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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
---------------------------------------------------------------