KIN 405 Lecture 5 - Assessment of Cardiorespiratory Fitness...

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Assessment of Cardiorespiratory Fitness Review Cardiovascular Anatomy and Physiology as necessary “Physical fitness is the ability to perform occupational, recreational and activities of daily living without undue fatigue.”
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VO 2max : the most valid measure of cardiorespiratory system func9oning What is Maximal Aerobic Power or VO 2max ? Maximal amount of oxygen that can be consumed per unit time by an individual during activity of continued to exhaustion Maximal amount of oxygen that CR system (heart, lungs & blood) can transport to working muscles AND ability for muscles to utilize the oxygen.
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VO 2max Upper limit for energy production by the aerobic system during endurance events àฏ greater VO 2max indicates high capacity to take up O 2 and produce • VO 2max is limited by the CR system to transport O 2 to the muscle
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Why train to increase VO 2max ? Aerobic training will induce metabolic & physiological adaptations to increase VO 2max , such as: Improved muscle energy production with increased , energy-based enzymes etc Improved cardio-respiratory adaptations Improved overall function in clinical populations
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Assessing Cardiorespiratory Fitness: Assessing VO 2 max & VO 2 peak
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Direct Determina>on of VO 2 max Fick’s Equation: Q = VO 2 / ( a – v) O 2 difference VO 2 = C ardiac Output x (a – v) O 2 difference Where: a = arterial oxygen content v = mixed venous oxygen content
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Indirect Es>mate of VO 2 max Open Circuit Spirometry: Inhale room air (known composition) Exhale through receptacle (volume), composition of expired gases determined VO 2 = (amount of O 2 inspired) – (amount of O 2 expired) VO 2 = (V I STPD * F I O 2 ) – (V ESTPD * F E O 2 )
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Importance of determining VO 2max during incremental exercise test (GXT) Used to : Classify CR fitness – best indicator of fitness (stress testing – heart, lungs, circulation) Assess and accurately prescribe exercise in clinical settings (exercise consultants) Set realistic goals As a to evaluate progress of exercise program Assess training status or demonstrate a training effect (coaches) Assess energy expenditure at different settings
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Determina>on of Maximal Oxygen Uptake During GXT In general: Start at rest and record HR, VO 2 , Work Rate Incremental increases in work rate every while maintaining pedaling frequency (rpm) Continue to increase until reach exhaustion Testing only for VO 2 is measured as: mL O 2 /kg BW/min or L/min
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METs 1 Metabolic Equivalent (MET) = 3.5 ml of oxygen/ kilogram BW / minute - An estimate of resting oxygen uptake - Activities can be described in multiples of 1 MET
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Procedures for Administering a Graded Exercise Test Give client instructions at least one day before. See procedures in text – regular and clinical** BE AWARE OF ALL INDICATORS FOR STOPPING A TEST p.70 Keep an eye on your participant at all times!!!
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  • Fall '12
  • MarinaMourtzakis

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