Answered: Understand the contribution of heart…

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Understand the contribution of heart rate, stroke volume, and the a-v̄O2 difference in determining V̇ O2 max.

Lifetime Physical Fitness & Wellness

15th Edition

ISBN:9781337677509

Author:HOEGER

Publisher:HOEGER

Chapter6: Cardiorespiratory Endurance

Section: Chapter Questions

Problem 3AYK

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Describe how cardiac performance is measured in cardiac output. In your answer, be sure to describe the role of stroke volume (SV) and HR by defining each and discussing factors that influence SV in particular both during acute exercise and following chronic exercise training.
Given heart rate of 95 beats per minute, blood pressure of 125/90 mmHg, 0.2 mL O₂/mL systemic blood arterial oxygen content, 0.1 mL O₂/mL pulmonary arterial oxygen content, and 400 mL O₂/min oxygen consumption. Based on the information, calculate the i) stroke volume. and ii) total peripheral resistance. Show your work.
Calculate %HRR for an individual (63 years old) who has a heart rate of 140 during running. The resting heart rate of this individual is 60 (HRmax= 208-0.7* age).
Discuss how changes in EDV and force of contraction with exercise affect stroke volume.
Other than heart rate what are two other variables that increase with exercise and why do they increase? Possibly variables include systolic BP, Diastolic BP, MAP, R-T interval, etc.
Define preload, afterload, and contractility, and discuss the role of each in the increase in the maximal stroke volume that occurs with endurance training.
What caused the change in HR with exercise Discuss the effect of venous return and heart rate on exercise EDV
Compare heart rate during supine and seated positions. What explains any differences you might observe?
Match the pieces of the negative feedback arc that regulated the increase in stroke volume seen during exercise by Jose. Answer choices (arteriolar smooth muscle, increase in MAP, decrease in total peripheral resistance, sympathetic nervous system, hypothalamus, ventricular cardiac muscle cells, baroreceptor, afferent nerves, medulla oblongata, increase in total peripheral resistance, decrease in osmolarity of blood, SA node of heart, decrease in MAP, increase in osmolarity of blood, homunculus)
Assume that one ventricle of a child’s heart has an EDV of 90 mL, an ESV of 60 mL, and a cardiac output of 2.55 L/min. What are the child’s stroke volume (SV), ejection fraction (EF), and heart rate (HR)?a. SV = 60 mL; EF = 33%; HR = 85 bpmb. SV = 30 mL; EF = 60%; HR = 75 bpmc. SV = 150 mL; EF = 67%; HR = 42 bpmd. SV = 30 mL; EF = 33%; HR = 85 bpme. Not enough information is given to calculate these.
Explain how management of FITT variables help make progress towards gaining cardiovascular endurance?
Sue goes to the gym and after an initial warm-up, she increases her exercise level pushing herself to maximum. At this point her heart rate is 175 beats/min and her stroke volume is 135 ml/beat. What is her cardiac output now? At this point, by how many ml/min has her CO increased over her resting CO? What % increase over resting is this? (Use the following equation). amount of increase in CO in ml/min % increase = _____________ X 100% original CO (resting) ml/min What term is used to describe this increase in CO?