In arm wrestling, there are four muscles primarily used :Biceps:brachii: Pronator teres: Pectoralis major: Flexor carpi ulnas

Other muscles such as the Deltoid latissimus dorsii and theTriceps brachii are also used.

Forearm muscles are generally thought to the most important withupper arm and chest providing strength as well.

In this lab, we recorded and examined the activity in theBiceps brachii and the Pronator teres musclesduring a simulated arm wrestling match and a real arm wrestlingmatch.

This requires 2 subjects, one with electrodes attached to theirbiceps brachii and pronator teresmuscles. Once the 2 subjects were chosen, electrodeswere placed and correct lead wires attached to one of thevolunteers.

Before recording begins, the 2 subjects get into correct armwrestling position – arms should be ~ perpendicular to the tablewith elbows resting on the table (this is the neutral position).NOTE: Onlysubject 1 was attached to the EMGunit

(a)Subject 1 “winning” muscle activity/Subject 2 “losing” muscleactivity: Recording begins and Subject 1 slowlymoved from the neutral position pushing Subject 2’s arm towards thetabletop (~ halfway) holding this position for 4 sec. then relaxingand returning to the neutral position for 4 sec.

(b)Subject 1 “losing” muscle activity/Subject 2 “winning” muscleactivity. Subject 2 now pushed Subject 1’s armtowards the tabletop (again, ~ halfway) and held the position for 4sec. before relaxing and returning to the neutral position.

DATA AND ANALYSIS:

The absolute integer value of electricalactivity for each muscle type in the winning and losing positionswas measured and added to Table 1.

(Don’t forget to add the appropriate title)

Table 1: (add title here)

Muscle	Absolute integer value for Subject 1 in the “winning”position	Absolute integer value for Subject 1 in the “losing”position
Biceps brachii	0.620 mV	0.425 mV
Pronator teres	1.895 mV	0.235 mV

1) Which muscle is more active in the “winning” position(remember that muscle exertion is minimal in this part of the lab)?Explain from the data why you chose that musclegroup.

2) Which muscle is more active in the “losing” position (again,remember that muscle exertion is minimal in this part of the lab)?Explain from the data why you chose that musclegroup

In this part of the lab, again only one of thesubjects had the electrodes placed on their muscles

Electrode and lead placement – same as inPart I

Procedure:

Before recording, the subjects were ready for the match and inthe neutral position. The match was over when the subject pinstheir opponent’s arm to the table (or if the subject’s arm ispinned to the table).

PART II: DATA AND ANALYSIS

The volunteer that was attached to theelectrodes LOST the armwrestle. The data for their muscle activity in the 2opposing muscles is recorded in Table 2. (don’t forget to add thetable title)

Table2:

Muscle	Absolute Integer for Subject 1 in the losingposition
Biceps brachii	3.456 mV
Pronator teres	2.322 mV

For the next part of the lab, subtract the mock arm wrestle datafrom Table 1 from the real arm wrestle data in Table 2 to obtainthe delta change in muscle activity for Table 3:

Table3:

Muscle	1) Delta change in muscle activity in the losingposition
Biceps brachii
Pronator teres

(3) Based on the above data, which muscle is the most active interms of winning and losing an arm wrestling match? Is there adifference between the results for the “fake” arm wrestling and thereal arm wrestling? Explain your answers.

Answer rating: 100% (QA)

Table 1 Muscle activity in winning and losing positions Muscle Absolute integer value for ... View the full answer