Muscle Fatigue Lab Report

The more stimuli per second, the greater the force generated by the muscle due to a

The lab chart was then stopped once the 5s contraction period had ended. Then the maximum force in Neutons (N) for that trial was calculated by the chart. The 5s MVC procedure was then repeated two more times and the MVC for each trial was calculated by the chart software and the highest MVC contraction and MVC for each trial was then identified and all the values were out into table 1.5. Then each participant 90% MVC was calculated by taking the 100% MVC and multiplying it by 0.9 which was then put into the second table, and the guideline of the participants 90% max was then put into the lab chart. The participant then prepared to hold their 90% MVC for 1 minute. With their knee already extended as far as they could without contracting with no slack in the line or chain the lab chart was started and the participant was instructed to kick out to achieve maximal force and tried to hold it for 1 minute to the best of their abilities and then relax when the minute has

I chose to track degree of fatigue because of the recurring emphasis on the importance of diet in correlation to the overwhelming lack of energy associated with the standard American diet. I hypothesise, that the ongoing sense of fatigue among American society can be combatted most efficiently through a whole food carbohydrate based diet.

The patient may move the muscle against gravity but not against resistance from the examiner

From this experiment we moved on to the strength-duration curve in exercise 3. For our nerve, the duration could not be decreased low enough as seen in Figure 3. This is could have been due to faulty use of the machinery or maybe our nerve was severed to

Muscular strength and endurance is also important to consider when looking at an individual’s overall fitness. In this lab, we performed the grip strength and it is used to assess injury or motivation. Also, it evaluates the strength the individual is using. Assessing muscular endurance is important to the clinician because it helps with exercise prescription, and it tells the clinician whether or not the individual has certain muscle weakness or imbalance that could make them more prone to

You are invited to take part in a research study. The purpose of this study is to examine the effect of one week, sport specific weight loss on the quadriceps muscle group and hand grip force production in wrestlers with 2 or more years of experience. Since the majority of wrestlers tend to wait until the week before competition to begin losing weight to be able to compete in their desired weight class, a loss of strength could follow. Research suggests this loss of weight within such a short period of time will cause a decrease in performance, and as an athlete, you want to be competing at your best at all times. You have been invited to take part in this study because you are or have been a wrestler. Ten people will be a part of

While post activation potentiation may improve mechanical output it may also induce muscle fatigue and if there could be a potential increase in mechanical power in a subsequent explosive activity[DB5] [SM6] , further research on Post Activation Potentiation is necessary ([DB7] Neale Anthony Tillin, 2009; David Docherty, 2007; Cameron J. Mitchell, 2011). Further research on post activation potentiation may be necessary as MVCs have been utilized to demonstrate PAP, but have not formally been used in contralateral limb investigations. Previous studies have had participants perform Knee Extensor MVCs for 10-seconds to induce post-activation potentiation, similarly the same duration will be performed when testing potentiation in the contralateral limb (Hamada T, 2000). Studies testing muscle fatigue effects have used contraction durations of 100-seconds, following two sets of pre-test MVCs (Halperin et al. 2014). A similar protocol will be utilized when testing fatigue effects in contralateral potentiation. It should be noted that the effects of potentiation may be limited, as some studies have concluded

Plyometric exercise protocol was the exercise used to induce muscle damage. The participants did ten sets of ten plyometric drop jumps. Following the plyometric exercise protocol, the participants drew sealed envelopes that gave them their group assignment. The participants’ EIMD were then observed and documented at 1, 24, 48, 72, and 96 hours after exercising by looking at four assessments: jump performance, isokinetic muscle strength, perceived muscle soreness, and blood markers. The researches studied the participants’ jump performance by measuring their squat and countermovement jump height with a vaned jump and reach apparatus. Isokinetic dynamometry was used to determine isokinetic muscle strength. The participants were sitting upright with their experimental leg secured to avoid any other movements besides what’s being tested. The dynamometer measured the concentric contractions at 60° and 180° s-1 through 90° range of movement. Perceived muscle soreness was measured by having the participants squat at 90° and then report their soreness on a scale of 0-10, with 0 meaning no pain and 10 meaning the worst pain ever. Blood was also tested to assess EIMD. A 6-ml venous blood sample from the antecubital vein was taken and then centrifuged for ten minutes to get a sample of the blood

Grip strength is used extensively in the hand function assessment as it is directly affected by the neural, muscular and skeletal systems. It is also used to evaluated patients with a large range of pathologies that impair the upper extremities, including rheumatoid arthritis, osteoarthritis, muscular dystrophy, tenosynovitis, stroke, and congenital malformations, (Ploegmakers, Ann, Jan, Sjoerd, & Martin, 2013) The force is most commonly measured in kilograms and pounds, but also in millilitres of mercury and in newtons using a Martin vigorimeter device (Elmed, Addison, IL) (Bautmans, Njemini, Lambert, Demanet, & Mets, 2005). According to (Brookfield, 2002) hand grip of an individual give a good representation of the overall muscular

The purpose of the experiment in lab 5 was to see how force and EMG of the muscles would be affected when the wrist angles were changed. In order to determine how much the myosin and actin were interacting and how many times the muscle cell was stimulated we had to measure the force. When the wrist was fully flexed at 90-degrees the muscle was more contracted. Therefore, causing the sarcomere to be pushed closer together and the zone of overlap to be larger. This causes the myosin and actin to be on top of each other making it more difficult to have a quality cross bridge formation. This makes it harder to stimulate the muscle. As we continued to squeeze at different angles the force would get greater as the angle became more flat. We had the

All participants in the study were both the experimental and control groups. The sessions were separated by four weeks; the sessions were randomly assigned to the participants. The testing sessions included an orientation with 1RM squat and practice of each test, followed by four conditions four weeks apart. The participants warmed up on the cycle ergometer then completed the DOMS protocol. Data was analyzed using magnitude-based inferences. Baker et.al

Lu, Chien, Chang, and Hsu had two primary purposes for their study. These purposes were to determine if an examiner’s strength have an affect on the validity of knee manual muscle testing (MMT) strength measurements using a hand-held dynamometer (HHD), and whether increasing the forces applied by an examiner using a resistance-enhanced dynamometer (RED) would positively affect measurement validity.

His performance for the Five-times-sit-to-stand test (FTSST) demonstrated a significant change week after week as shown in Figure 2, with a minimal detectable change (MDC) of over 17.5% or over 2.5 seconds for each week. And since an obvious increase in strength and ability based on the result during testing after the fourth week, a separate test was conducted without the use of his hands for support in the same chair. The result of this FTSST was recorded at 70 seconds. Now this was significant because he was not able to perform this activity since the onset of his

Patients in Group 2 (stretch kinesiatrics group) performed repetitive joint exercises for 15 minutes, using an isokinetic dynamometer (CYBEX 6000®, Lumex Inc. Ronkonkoma, NY, USA). Before starting the stretch exercise, the seat of the isokinetic dynamometer was folded to the rear; depending on the presence or absence of hip joint flexion establishment, the patients took a position somewhere between supine and the hip joint flexion position (maximum position at 30° of flexion). Since the angular velocities of joints prevent possible muscle damage resulting from long hours of joint exercises, relatively low velocities of 30 °/sec and 60 °/sec were chosen to simulate natural joint exercises. For the bending and stretching joint exercises, four