# propose an efficient synthesis for the following transformation:

Question 1

Question 2

Question 3

Tachycardia is defined as more than how many beats per minute?

A) 90

B) 100

C) 120

D) 140

The heart is very important organ responsible for pumping blood throughout the body. The heart must beat at a normal rate in order to supply adequate amount of oxygenated blood to the other organs. Tachycardia occurs when the heart pumps blood at an abnormal rate.

Question 4

Is 70 max heart rate normal with vigorous exercise?

There is not a single number or a narrow range of heart rate that can be designated as the “correct” one for vigorous exercise, since an appropriate intensity can vary from person to person. However, there are some guidelines to gauge safe exercising.

Answer to question 1

Answer to question 2

Answer to question 3

The correct is B. 100

The heart beats and pumps blood at a normal range of 60-100 beats per minute. Any faster than this can be considered as tachycardia. This fast and irregular rhythm can go up to extreme levels of 400 beats per minute which is no longer efficient in delivering oxygenated blood.

Answer to question 4

This question first requires some mathematical background to elaborate on “normal” heart rates. Since an appropriate heart rate range can vary between people, one way to start is by determining a maximal heart rate (MHR), which can be considered the ‘upper limit’ of how hard to work during vigorous exercise. The American Council on Exercise notes that the formula of 220 minus age has been widely used, but is subject to error, so a more accurate method is to use 208 – (0.7 x age). Once this number is determined for the MHR, calculating Heart Rate Reserve (HRR) can be used to provide a range for vigorous exercise. Heart Rate Reserve is calculating by subtracting the resting heart rate from the MHR. For example, someone with a MHR of 190 beats per minute (bpm) and a resting heart rate of 80 bpm would have a HRR of 110. There are various ways to define intensity, but one way that the American College of Sports Medicine defines vigorous exercise is at 60% or more of someone’s HRR. After calculating this, it’s then necessary to add the resting heart rate back in, to arrive at an approximate heart rate where anything at or above it would be vigorous. In our same example, 60% of 110 is 66, and adding the resting heart rate of 80 bpm back in gives a heart rate of 146 bpm. Based on this, it is very unlikely that this process would give a number as low as 70 bpm for a vigorous intensity heart rate. In addition, the range for a normal resting heart rate is between 60 to 100 beats per minute, and heart rate increases with the intensity of exercise. Therefore, someone with a heart rate of only 70 bpm during vigorous exercise would be an unusual occurrence and the abnormally low heart rate may signal an underlying cardiac condition. Medical disclaimer: The information on this site is for educational purposes only and is not a substitute for professional medical advice.

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