Biopac Student Lab Lesson 1: Electromyography

ELECTROMYOGRAPHY I

Standard and Integrated EMG

DATA REPORT

Student’s Name: _______________________________

Lab Section: ____________________________________

Date. _____________________________________________

Data and Calculations

Subject Profile

Name _____________________________	Height ________________________
Age ______________________________	Weight ________________________

Gender: Male or Female

A. EMG Measurements

	Forearm 1		Forearm 2
Cluster #	P-P (3 p-p)	Mean ( 40 mean)	P-P (3 p-p)	Mean ( 40 mean)
1
2
3
4

Note: Clusters are the EMG bursts associated with each clench.

B. Use the mean measurement from the table above to compute the percentage increase in EMG activity recorded between the weakest clench and the strongest clench of Forearm I.

Calculation:

Answer: _____________ %

II. QUESTIONS

C. Compare the mean measurement for the right and left maximum clench EMG cluster. Are they the same or different?

______ Same _____ Different

Which one suggests the greater clench strength?

Right _____ Left _____ Neither

Explain.

E. What factors in addition to sex contribute to observed differences in clench strength?

F. Explain the source of signals detected by the EMG electrodes.

G. What does the term “motor unit recruitment” mean?

H. Define skeletal muscle tonus.

I. Define electromyography.

End of Lesson 1 Data Report