Bio 226 Isotonic and Isometric Contractions Assignment

Recruitment and Isotonic and Isometric Contract
OBJECTIVES AND REVIEW › PRE-LAB QUIZ › PRE-LAB REPORTING › DATA CO




Laboratory Report
Activity: Recruitment and Isotonic a

Name: Tyler Prichard


Instructor: Vikash Patel


Date: 05.24.2024



Predictions
1. When the arm goes from resting to flexing, the am
increase
2. During flexion, the amplitude and frequency of sE
be greater than
3. Recruitment of motor units will be greatest when t
20 pounds

Materials and Methods
Comparison Of Motor Unit Activation During Conc

1. Dependent Variable: amplitude and frequency of s
2. Independent Variable: muscle movement
3. Controlled Variables: total number of motor units p
condition

Recruitment During Isometric Contractions
1. Dependent Variable: amplitude and frequency of s
2. Independent Variable: muscle load
3. Controlled Variables: total number of motor units p
physical condition
4. What does the acronym sEMG stand for?

, Surface Electromyography


5. During a muscle contraction, what is recorded on a
Amplitude and frequency of sEMG spike



6. Spike numbers were measured during a ____msec
200




Results
Table 3: Muscle Tone (Resting

Amplitude (mV)

! Rest Concentric (5 lb) Eccent

Raw Subject 1 0.11 0.43 0.
Data
2 0.12 0.42 0.
3 0.13 0.48 0.

Average 0.12 0.44 0.


sEMG Amplitudes and Frequencies at Rest and Du
Amplitude (mV)
0.5

0.4

0.3

0.2

0.1

0

Rest Concentric Eccentric
Isotonic Isotonic
Contraction Contractions




Frequency (spikes number per 0.2 sec time period)
25

20

15