Based on changes in amplitude and frequency of sEMG, did motor unit activation increase, decrease, or stay the same with increasing muscle load? The motor unit activation increased with muscle load based on the changes in amplitude and frequency of sEMG because the motor units which are activated are contracting at a greater frequency. 8. Do you think that the force of isometric contraction increased, decreased, or stayed the same as muscle load increased? The force of the isometric contraction increased as the muscle load increased.
400mV 2. What is the maximum force generated at the threshold stimulus? 0.084gf 3. How does increasing voltage above threshold stimulus affect force development? When the stimulas voltage is increased an increase within the entire muscle begins to take place.
LABORATORY REPORT Activity 2: Twitch Contractions and Summation PREDICTIONS Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases: Contraction Force Increases. Effect of Stimulation Frequency on Contraction 2. As the frequency of stimulation increases, the force of contraction: Increases. MATERIALS AND METHODS Measurement of Threshold Stimulus 1.
Which of the types of stretching techniques is seldom recommended in sedentary individuals due to the potential for causing muscle soreness? a. ballistic b. static c. PNF d. strength 35. Body composition refers to the different types of tissues that make up your body. The primarily include: a. muscles and bones b. tendons and ligaments c. skin and fat d. all of these 36. Fast-twitch muscle fibers are more useful in long-term endurance activities such as running or swimming a.
Unit 2 Acute response to exercise is short term effects that exercise has on the body. Musculoskeletal response An acute response of the musculoskeletal system during exercise includes an increase in blood supply. The short term effects on your muscles increases the temperature therefore there is more activation energy so chemical reactions are used by the musculoskeletal system and the metabolic activity increases. As the oxygen demand increases, more oxygenated blood needs to be supplied to the muscles so vasodilatation occurs so more blood can pass through the arteries. This affected me during the bleep test because vasodilation allows more oxygenated blood to travel to the actively respiring muscle tissues.
During exercise your heart will rise and then level off, depending on your level of fitness. A person’s working HR displays the intensity of their workout. A trained athlete can work for longer periods of time at a higher level whereas an untrained athlete’s HR would level off in a smaller period of time and less intensity. Stroke Volume is the amount of blood pumped by the left ventricle in each beat, measured in mls/beat. As intensity during exercise increases so does SV.
Bones respond to lifting, making them stronger and then helping to prevent osteoporosis. Your metabolic rate increases, as lifting builds muscle, and muscle burns more calories than fat. When you lift, it rips little strands of muscle tissue, and the muscles grow back bigger and stronger. This makes me stronger, and able to do more things in my life. As result of being stronger, I am able to increase my performance in sports.
Case Study Questions: 1.) Explain the renin-angiotensin-aldosterone system. When the kidneys sense decreased profusion pressure, they try to increase this pressure by increasing blood volume through the renin-angiotension-aldosterone system. Once the decreased pressure is sensed renin is released, which increases conversion of angiotension to angiotension I. Angiotension I is in turn converted to angiotension II by the angiontension converting enzyme (ACE). Angiotension II causes vasoconstriction, which raises the blood pressure.
The purpose of this phase is to generate a training base or foundation from which to build upon. The basic strength phase involves moderate volume and high intensity. The number of repetitions decreases from the hypertrophy phase, but the percentage of 1-RM increases during this phase. The power phase involves low volume and high to very high intensity. The purpose of this phase is to recruit the fast twitch muscle fibers.
A primary headache is not an indication for a specific disease usually. The chemical activity in the brain, nerves, blood vessels around one’s skull, the muscles of the head and neck or a mixture of these factors can act as agents for such headaches. Some people are genetically probable to have