Factors Affecting Response Question & Answer Guide (With Explanation)
This question focuses on applying theory to practical scenarios.
What This Question Is About
This question relates to factors affecting response and requires a structured academic response.
How to Approach This Question
Focus on explaining concepts clearly and supporting them with examples.
Key Explanation
This topic involves factors affecting response. A strong answer should include explanation, application, and examples.
Original Question
Factors Affecting HR Response: e.g. AGE • Maximum attainable HR decreases with age. • Age-predicted Maximum Heart Rate: • HRmax = 220-age • (SD 10pbm) • The magnitude of the HR response is related to age, body position, fitness level, type of physical activity, presence of disease, medications, blood volume & environmental conditions. (2) Stroke volume (SV) • Volume of blood ejected per heart beat • i.e. difference btw end-diastolic volume (EDV) and end-systolic volume (ESV) • EDV is determined by (i) HR, (ii) filling pressure and (iii) ventricular compliance • ESV depends on (i) contractility and (ii)afterloads • A greater preload (filling pressure) increases SV • A greater afterload (ventricular outflow resistance) decreases SV • SV at rest generally varies between 60 and 100ml/beat • During exercise, SV increases to around 100 – 120ml with work rate until it reaches nearly maximum at around 50% of aerobic capacity ↳ VO z Max. (3) Cardiac Output (CO) • Cardiac Output (CO) = Stroke volume (SV) x Heart rate (HR) • CO Increase linearly with increased work rate • 5L/min resting to 20L/min during exercise rate • At exercise intensity up to 50% VO2max, the CO increase is facilitated by increases in HR and SV. • Thereafter, the increase results almost solely from the continued increase in HR. Stroke volume Heart (4) Blood Flow (BF) • At rest, 15 – 20 % of CO is distributed to the skeletal muscles. • With exercise, myo explain the above to me with example
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