UMass Amherst KIN 100 - Ex Phys Lab 6 (5 pages)

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Ex Phys Lab 6



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Ex Phys Lab 6

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Pages:
5
School:
University of Massachusetts Amherst
Course:
Kin 100 - Introduction to Kinesiology
Introduction to Kinesiology Documents

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Emily Weimer Laboratory 6 Muscle Strength Endurance Fatigue Introduction The focus of this lab was to analyze the relationships between muscle strength force endurance and fatigue These variables were studied while engaging in isometric exercises Muscular strength is directly related to the cross sectional area of the muscle Thus having larger muscles will result in more muscular strength and ultimately producing more force When studying muscular strength in an individual it is also to note that training status gender age genetics illness and injury play roles in influencing strength Increasing muscular force can be done through resistance training Resistance training results in an increase in sarcomeres which results in greater force generation from the muscles Muscular endurance refers to the ability of a muscle or muscle group to sustain a force for a prolonged period of time Muscular strength looks at how much force whereas muscular endurance looks at how long Muscular fatigue happens at the end of muscular endurance referring to the decline in maximal force production during both short term high intensity exercise or long term submaximal exercise The muscular contractions that happen in the body allow for exercise to take place These contractions are the generator of muscular force They are dependent on the number of attached cross bridges and the regulation of actin and myosin across these bridges These contractions are also based on the rate at which they are recruited the number of motor units recruited and the size of the muscle In order for motor units to fire they require action potentials Action potentials work in an all or nothing fashion meaning that if the action potential is weak the motor unit will not fire at all When performing an easy task fewer motor units will be recruited than if the task was more difficult When firing motor units smaller units are first activated followed by larger motor units if necessary to produce a greater force Lastly



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