Hello my name is Steven committee and I’ll be presenting on the validity of surface electromyography as an indication of forearm muscle fatigue surface electromyography EMG allows one to record the activity of a muscle in a non-invasive reproducible way EMG also allows for the recording of sequencing of muscle activations relative to each other muscle fatigue is an exercise induced.
Decline in maximal voluntary muscle force despite maximal effort which is a normal response to sustain such physical ever with these pieces of.
In mind the purpose of this experiment.
Was to document the effects of fatigue on the forearm muscles during isometric contraction measured in amplitude my hypothesis was that EMG signal will increase as the subjects hand becomes more fatigued the eight subjects in the.
Study consisted of five males and three females all first-year Regius DPT students between the ages of 22 and 30 years old for the study a surface EMG was conducted on the muscle belly of the forum extensors and forearm flexors maximum grip tests were taken in standard position subjects were then asked to.
Maintain 25% of their maximum grip force for as long as possible while two testers measured EMG and force values every 15 seconds.
Until a subject could not maintain 25% peak grip force EMG readings were then plotted over time as expected EMG values seen in Figure two and three showed it steady increase over time and force values seen in figure four should have studied decrease over time this is attributed to an increase in muscle motor unit recruitment as the four muscles could not sustain 25% of maximum.
Grip force for such a prolonged period of time it’s important to note that our EMG graphs showed a steep.
Decrease at about 210 seconds and 285 seconds this was due to.
One or more subjects finishing test at these time points therefore decreasing the main um G value significantly.
However there is still a steady increase in EMG values between zero seconds and 210 seconds 210 seconds in two hundred eighty.
Five seconds and 285 seconds and.
450 seconds the steady increase supports my initial hypothesis muscular fatigue shows relevance in the clinic since the understanding of muscular fatigue is the basis of neuromuscular overload and adaptation which is necessary for successful rehabilitation and the training of patients muscular fatigue therefore defines.
The limits of human performance in any task from activities of daily living to high-performance sports thank you very much for listening to my presentation I would like to open the floor to any questions.