LABORATORY REPORT Activity 2: Twitch Contractions and Summation Name: Ruthann Baker Instructor: Date: March 9, 2014 PREDICTIONS Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases: force of contraction increases and then decreases at longer lengths 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. Dependent Variable ….. Contraction force 2. Independent Variable... stimulation voltage 3.
LABORATORY REPORT Activity: Recruitment and Isotonic and Isometric Contractions Name: Carolyn Chrzastowski Instructor: Professor Waite Date: 07.19.2015 Predictions When the arm goes from resting to flexing, the amplitude and frequency of sEMG spikes will increase During flexion, the amplitude and frequency of sEMG spikes will ___ during extension. be greater than Recruitment of motor units will be greatest when the load is 20 pounds Materials and Methods Comparison of motor unit activation during muscle tone and concentric and eccentric isotonic contractions Dependent Variable amplitude and frequency of sEMG spikes Independent Variable muscle movement Controlled Variables total number of motor units
LABORATORY REPORT Activity: Name: Instructor: Date: Twitch Contractions and Summation Predictions Effect of Muscle Fiber Length on Contraction 1. As muscle fiber length increases contraction force decreases 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 Dependent Variable contraction force Independent Variable stimulation voltage Controlled Variables temperature, frequency of stimulation, muscle fiber length Effect of Muscle Length on Contraction Dependent Variable contraction force Independent Variable muscle fiber length Controlled Variables temperature, stimulation voltage, frequency of stimulation Effect of Stimulation Frequency on Contraction Dependent Variable contraction force Independent Variable frequency of stimulation Controlled Variables temperature, stimulation voltage 4. What structure was stimulated to cause a muscle contraction? The motor unit was stimulated 5.
No change 6. Did the functional residual capacity increase, decrease, or not change with exercise? decrease 7. Did the minute ventilation increase, decrease, or not change with exercise? increase See Table 3: Lung Capacities and Minute Ventilation See Graph: Comparison of Resting and Exercising Lung Capacities and Minute Ventilation DISCUSSION 1.
BIOS 255 Week 4 Lab: #7 Effect of Exercise on Arterial Pressure and Vascular Resistance LABORATORY REPORT Activity 7: Effect of Exercise on Arterial Pressure and Vascular Resistance PREDICTIONS 1. During exercise: MAP will increase 2. During exercise: CO will increase 3: During exercise: SVR will decrease MATERIALS AND METHODS 1. Dependent Variable: heart rate (HR), stroke volume (SV), blood pressure (BP) 2. Independent Variable: level of activity 3.
Definition- Refers to the amount of force a muscle can produce with a single maximal effort. Size of muscle cells and the ability of nerves to activate them are related to muscle strength. Test- Chin ups test, doing certain amounts of chin ups in 1 minute’s time. This test shows how much chin ups are sportiest capable of doing. Compare against Public Service test- Public services have common strength test, which tests the same muscle group, which is upper muscles.
To make sure she is only breathing in and out of her mouth RESULTS See Table 2: Average Breathing Rates and Lung Volumes See Graph: Comparison of Resting and Exercising Lung Volumes and Breathing Rate 1. Did the breathing rate increase, decrease, or not change with exercise? Increase 2. Did the tidal volume increase, decrease, or not change with exercise? Increase 3.
Obtain your Maximum Heart Rate (MHR) by subtracting your age from 220. | | | | Example220 – 21 = 199 220-18=202 | Your Information220 - ____ = ____ (your MHR) | | | 1. 2. Subtract your resting heart rate (RHR) that you calculated in Part II above from the maximum heart rate (MHR) that you just determined in Step 1. | | | | Example199 - 70 (RHR) = 129 202-70=132 | Your Information(MHR – RHR = ____)____ - ____ = _____ | | | 3.
These processes are also known as cold working. In our lab, we showed how cold working will increase the strength of a metal material by inducing plastic deformation on a steel sample and an aluminum sample using an MTI tensile testing machine. INTRODUCTION Work Hardening Work hardening is defined as the phenomenon that occurs when a metal is strained beyond the yield point. Increasing stress is required to produce additional plastic deformation causing the metal to become stronger and more difficult to deform. If true stress is plotted against true strain, the rate of strain hardening tends to become almost uniform, that is, the curve becomes almost a straight line .
P2 Fitness test for the main components of fitness There are 8 components of fitness which are, cardiovascular endurance, strength, muscular endurance, flexibility, speed, reaction time, agility and coordination. 1. Cardiovascular endurance This is also known as an aerobic endurance or stamina, which is the ability to repeat an activity for a length of time without becoming tired. A fitness test for this component is the cooper or bleep test. Cooper Test/Beep test Cardiovascular endurance can tested for by using various maximal tests which test your limit of endurance in some exercise .