UMass Amherst KIN 470 - Lab 1 Handout - Wingate-1_adjusted (6 pages)

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Lab 1 Handout - Wingate-1_adjusted



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Lab 1 Handout - Wingate-1_adjusted

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Pages:
6
School:
University of Massachusetts Amherst
Course:
Kin 470 - Exercise Physiology

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LABORATORY 1 Anaerobic Power and the Anticipatory Response to Exertion IMPORTANT TERMS 1 2 3 Mean anaerobic power Peak anaerobic power Specificity IMPORTANT CONCEPTS 1 2 3 4 5 Resting physiology and anticipation of impending physical exertion Determining the capacities of lower limb musculature for generating power using the Wingate Test Relationship of length and intensity of exercise and the contribution of the major energy systems Units of measurement for anaerobic power Concept of specificity in regards to testing and performance INTRODUCTION During any form of physical activity ATP is simultaneously produced from the three energy systems That is all three energy systems contribute in some manner to mechanical work The three major energy systems are 1 2 3 ATP PCr system Glycolytic energy system Aerobic energy system During high intensity short duration activities maximal muscle contractions are performed which recruit high conduction velocity motor units that typically innervate fast contracting glycolytic muscle fibers Due to their high concentrations of glycolytic enzymes and relatively few mitochondria these fibers tend to produce lactic acid Lactate is produced regardless of the amount of oxygen available The proportion of contribution of each energy system varies with both intensity and duration of exercise We know that all out efforts lasting less than 10 seconds use primarily the ATP PCr system to provide ATP while all out efforts lasting from 10 60 seconds utilize anaerobic glycolysis to provide ATP increasing contribution from glycolysis as exercise time increases from 10 to 60 seconds This principle should be remembered when employing tests to evaluate anaerobic power for a particular sport or event When evaluating the maximal capacity of the various energy systems there are two considerations that must not be overlooked 1 2 The test should be performed at a maximum effort For example an incremental max VO 2 test measures the maximal capacity of the aerobic energy system as the participant is pushed to a maximal level of oxygen consumption During the final stages of the incremental test the participant is sustaining a level of exercise that represents the maximal capacity of the aerobic of the aerobic energy system The duration of the test should be sufficient to allow maximal contribution from the desired energy system An incremental exercise test to exhaustion provides little insight to the maximal capacity of either the ATP PCr or glycolytic energy systems To properly evaluate the capacity of the anaerobic energy system a maximal effort should be elicited over a period of 30 60 seconds Both running and cycling anaerobic tests have been proposed but the Wingate Test a cycle ergometer protocol is most commonly used The advantage of the Wingate test is that since it is conducted on a cycle ergometer power can be measured in precise units Further the Wingate test allows for evaluation of both the ATP PCr and glycolytic energy systems



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