ipl-logo

Skeletal Muscle Lab Report

1876 Words8 Pages

Introduction The objective of this experiment was to look at and measure a muscle contraction, as well as to understand how fatigue affects muscle strength. Humans are made up of multiple different types of muscle, one of which is skeletal muscle. Skeletal muscle is a collection of muscle fibers that position and move the skeleton (Silverthorn & Ober, 2016). The muscles are then arranged into motor units, which are made up of a motor neuron and all the muscle fibers that are controlled by that motor neuron (Silverthorn & Ober, 2016). These motor units act in an all-or-none manner to create a contraction (tension in the muscle). Therefore, to create varied types of contractions with different forces and lengths, the muscle is made up of different …show more content…

As the force increases the amplitude of the EMG activity also appears to increase. The corresponding table of values (Table 1) is located beneath the figure, showing that increase of force during the trials results in an increased EMG activity. In Figure 2, the effect of prolonged contractions is shown by the decrease in both muscle force and EMG activity for the dominant hand. The maximum muscle force of the dominant hand is 34.03 kg, while the half-max fatigue time is 15.995 seconds. Next, Figure 3 shows the EMG activity and force of the grip strength for the non-dominant hand. It is shown that as the force increases the amplitude of the EMG activity also appears to increase. Underneath Figure 3, is Table 2 corresponding values of absolute integral of EMG activity and the absolute integral of the area under the force curve. Figure 4 shows the effect of a prolonged contraction on the non-dominant hand. The maximum muscle force of the non-dominant is 33.519kg, while the half-max fatigue time for the non-dominant hand is 15.062 …show more content…

After a prolonged contraction, there is a decrease in muscle force and EMG activity. Discussion To begin, the EMG intensity was shown to increase as the force that was applied increased in the dominant hand. This trend was also seen in the non-dominant hand. From the data, one can see that as the force increases the EMG activity increases. This must mean that they are directly proportional to each other. In contrast to the literature values (Incelet al., 2002) the values obtained for the non-dominant hand were slightly higher than those of the dominant hand. However, this may be due to the subject’s initial grip strength for the dominant hand was lower and the amount of strength increased each trial was lower. Whereas, for the non-dominant, the difference in strength was increased by a greater amount for each trial. In other words, the increased amount of strength in each trial was relative to the first trial done on each hand. Therefore, if they started lower they will finish lower in comparison if they started at a higher grip

Show More
Related
723 Words | 3 Pages

Hoehn). An antagonist is a muscle that reverses, or opposes, the action of another muscle. A synergist is a muscle that aids the action of a prime mover by effecting the same movement or by stabilizing joints across which the prime which the prime mover acts, preventing undesirable movements. The sliding filament model of contraction states that during contraction the thin filaments slide past the “thick ones so that the actin and myosin filaments overlap to a greater degree” (Marieb & Hoehn). When the nervous system stimulates muscle fibers, the myosin heads on the thick filaments latch onto myosin-binding sites on actin in the thin filaments, and the sliding begins.

Read More
748 Words | 3 Pages

The demographics of the participants were six subjects male and female whose ages ranged from 19 to 22. All six participants were hooked up in attached to the electroids, goniometer, biopac and computer. And there were five trials conducted for each subject. A second person with tap the participant on the tendon around the knee that activates the reflex and the computer picks up both the moment of impact of the knee from the hammer, the moment of contraction, and the moment of movement. The numbers given to us by the computer is it in calculated in subtracted by each other in order to find both the premotor and motor times all in

Read More
1093 Words | 5 Pages

Shoulder strength was measured by a shoulder Nottingham Mecmesin Myometer (measures isometric muscle strength) at the five shoulder planes previously mentioned (forward flexion, abduction in scapular plane, abduction in

Read More
140 Words | 1 Pages

Concurrently, the patients recovered grip strength and could perform high-energy activities.

Read More
1142 Words | 5 Pages

50% of Maximum Handgrip Strength: 3. Isometric Endurance Time: Left Hand = 47.5 lbs / 21.6 kg Left Hand = 24 seconds Right Hand = 50 lbs / 22.8 kg Right Hand = 9 seconds Experiment #2: Vertical Jump Power 1. Standing Reach: 88 in / 223.5 cm

Read More
984 Words | 4 Pages

Based on the results from both studies, the muscle spasm theory is unfavorable in explaining

Read More
681 Words | 3 Pages

This can be achieved either by applying external force (passively) or by moving a body (or a limb) (actively). When a limb moves ballistic, rapid, forceful, the achievable range may exceed that achieved by slow to moderate movement. Exercises that are performed rapidly by concentric contractions of the antagonist muscle group refer to the dynamic stretching (DS) training. The speed of this form of stretching ranges from slow (low momentum) to ballistic stretching (BS) (high momentum) (11). Ballistic stretching uses muscle contractions to force muscle elongation

Read More
795 Words | 4 Pages

Foam rolling, a means of self myofacial release, has been hypothesized to aid in the recovery of DOMS and restore normal muscular function. This experiment sought to examine the rehabilitation effects of foam rolling on DOMS by looking for improvements in muscle soreness, voluntary and evoked contractions, vertical jump and

Read More
1442 Words | 6 Pages

Therefore, relaxation of muscles is essential because it leads to increase the supply of blood for metabolisms. Another change is the vascular resistance of the skeletal muscles. The resistance of skeletal muscles leads to build up of

Read More
879 Words | 4 Pages

Chest breathing increases the susceptibility of developing trigger points in the scalene muscles. The scalene muscles plays a role in elevation of the first two ribs during upper chest breathing. This muscle has the potential to influence carpal tunnel syndrome due

Read More
2340 Words | 10 Pages

“This test measures muscular endurance of the upper body, primarily the pushing muscles” (Clark, Sutton, & Lucett, 2014). In the push-up position, Jon’s ankles, knees, hips, shoulders, and head are in a straight line. Jon also can lower his body to touch where a partner’s closed fist placed under his chest would

Read More
738 Words | 3 Pages

The muscle and skeletal system work together to produce movement. An example of movement is the bones and muscles in the arm that help lift up an object. Tendons are fibrous tissue that connects adjacent bones to a muscle. A tendon is located at the top joint of a bone. Whereas the other bone is attached to the adjacent bone.

Read More
525 Words | 3 Pages

Speed of muscles exercise is extremely important when trying to achieve maximum results. One of the often-neglected aspects of speed is the pause, for example for bench-pressing it has been shown that a pause of four seconds while the muscle is contracted has an improved effect in muscle power. In order to develop maximum strength research shows that slow-speed lifting done with heavy weights has a distinct advantage over high-speed lifting. By slowing down the movement there is an increase in duration of the stimulus and the level of tension on the muscle; this increases the development of the muscle muss.

Read More
763 Words | 4 Pages

1.1 Force – Velocity Relationship Considering the mathematical equation for power (Power = Force x Velocity), it is clear that the two primary components that impact an athletes ability to generate HPO are their ability to generate high levels of force rapidly and express high contraction velocities (Kawamori, Haff 2004). The Force-Velocity Curve (fig 1) depicts the inverse relationship between the force a muscle can generate and the velocity at which it contracts. As the velocity of the of the movement increases, the amount of force that can be generated by a concentric muscle action decreases (Haff, Nimphius 2012a).

Read More
1028 Words | 5 Pages

First of all the heart rate, blood pressure and temperature were measured (all before exercise). Then the subjects then walked up and down the stairs five times each. The heart rate, blood pressure and temperature of the subjects were then recorded straight after the exercise after each two minutes until the resting rate for all three was reached. This exercise was repeated but prolonged to walking up and down the stairs then times.

Read More

More about Skeletal Muscle Lab Report

Open Document