Dear Kieran A. Coghlan
After read with very interest the article of Hodges “A comparison of computer-based methods for the determination of onset of muscle contraction using electromyography” I saw your matlab function what is very nice indeed (thank you for sharing) however I saw that the combination of parameters used in the article also account for the cutoff frequency used in the low pass filtering. According to Hodges “The criteria that most accurately identified the onset of EMG (25 ms/3 SD/50 Hz, 50 ms/1 SD/50 Hz, 10 ms/1 SD/ 500 Hz) resulted from the most appropriate combinations of the positive and negative influences of each of the parameters.” But in this function it seems that you don’t use a low pass filter cutoff frequency (is not an argument). Perhaps this information about low pass filter should be in the function or an option (low pass filter) could be added to the function so the raw data can be filtered before calculating the EMG onset and offset.
Kind regards,
Armindo Marques
Comment only
19 Oct 2007
EMGONOFF
Finds the "on" and "off" indicies of a single raw surface EMG burst (muscle contraction).
J B
For loops need vectorizing
3
13 May 2007
EMGONOFF
Finds the "on" and "off" indicies of a single raw surface EMG burst (muscle contraction).
Joe Chang
4
11 Feb 2007
EMGONOFF
Finds the "on" and "off" indicies of a single raw surface EMG burst (muscle contraction).
Comment only