Controlled Variables undefined; undefined; undefined Effect of Stimulation Frequency on Contraction 1. Dependent Variable undefined 2. Independent Variable undefined 3. Controlled Variables undefined; undefined 4. What structure was stimulated to cause a muscle contraction?
At a stimulation frequency of 15 Hz how many stimuli were there per second? There are 15 pulses (stimuli) per second. Results Table 4: Measurement of Threshold Stimulus Force (gf)(Motor neuron 1) 100 mV 0 Voltage (mV) 300 mV 0 200 mV 0 400 mV 0.080 500 mV 0.080 Effect of Stimulation Value on Twitch Contraction Force 1. What is the threshold stimulus? 400mV 2.
Did the inspiratory reserve volume increase, decrease, or not change with exercise? decrease 5. Did the inspiratory capacity increase, decrease, or not change with exercise? increase 6. Did the functional residual capacity increase, decrease, or not change with exercise?
LABORATORY REPORT Activity: Recruitment and Isotonic and Isometric Contractions Predictions When the arm goes from resting to flexing, the amplitude and frequency of sEMG spikes will During flexion, the amplitude and frequency of sEMG spikes will ___ during extension. Recruitment of motor units will be greatest when the load is Materials and Methods Comparison of motor unit activation during muscle tone and concentric and eccentric isotonic contractions Dependent Variable Independent Variable Controlled Variables Recruitment during isometric contractions Dependent Variable Independent Variable Controlled Variables 4. What does the acronym sEMG stand for? 5. During a muscle contraction, what is recorded on a sEMG?
The following graph illustrates the relationship between Maximum weight held at it’s related angle in upright and horizontal positions. It can be seen from the graph that both positions follow the same trend between maximum weight and its angle. As the angle increases, greater weight can be held. However, the value of the weights are greater in body its upright position. Experiment 2: To explore the force-velocity relationship, experiment 2 was conducted in two parts: In part A this relationship was investigated during maximal muscle contractions and in part B it was observed during a multi-joint and multi muscle activity while exercising on a wattbike.
Elasticity; The ability to be able to return to normal shape. While contraction is taking place the muscular system performs 3 functions; Motion, Heat Production and Maintenance of posture. Motion; The ability of being able to move e.g. walking or running. However, with motion you must know about levers.
The first part of the procedure is to investigate a = F/m by holding F constant This investigation involving the Atwood machine will investigate the different aspects of a = F/m. The first part of the procedure holds m constant while studying the relationship of F to a by altering the F of the system. Looking at the equation a = F/m, acceleration and force should be directly proportional to one another. F=ka and a=F/k. The second part of the procedure holds F constant and investigates the relationship of a to m by altering the total mass of the system.
How do the concepts intensity, duration and frequency apply to stretching programs? 9. Describe a stretching exercise that would be effective at stretching the muscles listed below. * Sternocleidomastoid * Trapezius * Deltoid (Anterior and Posterior Heads) * Latissimus Dorsi * Pectoralis Major * Triceps * Iliopsoas * Abdominals (rectus abdominus) * Abdominals (internal and external obliques) * Erector Spinae * Gluteus Maximus * Quadriceps * Hamstrings * Tibialis Anterior * Gastrocnemius * Soleus 10. Briefly explain what is meant by Proprioceptive Neuromuscular Facilitation (PNF) stretching.