KIN 405 Lecture 5

# 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.
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
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
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
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
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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