﻿ Human ear is sensite to sound intensity ranging from db? - ThatsAnswer.COM

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• Answer: One method is to monitor the heart rate of the individual undertaking the exercise. There are suggested ranges of heart rate for people of differing ages and for differing intensities of exercise. The method for estimating these is outlined below.

Another simple guideline for estimating exercise intensity is based on heart recovery rate once exercising has finished and states that 5 minutes after exercise has finished, your heart rate should have fallen below 120 beats per minute. If it has not, then the exercise has been too intense for your current level of aerobic fitness and it is suggested that you reduce the intensity until your fitness improves.

Broadly there are two zones of heart rates:
1. The fat burning zone
2. The cardio zone

The exact bounds of these zones varies from person to person, but an estimate can be made based on age.

In this example it is assumed that the person is a 25 year old with a resting heart rate (RHR) of 60 beats per minute (BPM).

To estimate your maximum heart rate (MHR), use the following equation:

MHR = 217 - (0.85 x age) = 196 BPM.

To find your resting heart rate, it can be measured directly. This would normally be done first thing in a morning when you wake up (before getting out of bed and before drinking anything containing caffeine).

In order to find the range of heart rates corresponding with the exercise zones, it is necessary to find your heart rate reserve (HRR):

HRR = maximum heart rate - resting heart rate.

In our example:
HRR = 196 - 60 = 136 BPM

In general the "fat burning" or low intensity zone is equal to approximately 60-70 % of your heart rate reserve plus your resting heart rate.

RHR + (0.6 x HRR) <= Fat burning zone >= RHR + (0.7 x HRR)

In our example:

60 + (0.6 x 136) = 142 BPM
60 + (0.7 x 136) = 155 BPM

This means that if your heart rate is in the range 142 to 155 BPM, your exercise intensity is in the fat burning zone (assuming you are 25 and have a resting heart rate of 60 BPM).

In general the "cardio" zone is equal to approximately 70-80 % of your heart rate reserve plus your resting heart rate.

RHR + (0.7 x HRR) <= cardio zone >= RHR + (0.8 x HRR)

In our example:

60 + (0.7 x 136) = 155 BPM
60 + (0.8 x 136) = 169 BPM

This means that if your heart rate is in the range 155 to 169 BPM, your exercise intensity is in the cardio zone (assuming you are 25 and have a resting heart rate of 60 BPM).

If your heart rate is higher than this then you are working outside the most effective cardio exercise zone.

When the heart rate of the individual is in the fat burning zone (more correctly it is this zone that trains your body to be more efficient at metabolising fat as a source of fuel) the majority of energy expanded during the exercise is used burning fat (as the name suggests).

This exercise tends to be of lower intensity (e.g. a fast / brisk walk or slow jog).

The cardio or aerobic exercise zone improves the bodies cardio-vascular system, making the transfer of blood around the body and oxygen and waste gasses to and from the lungs more efficient. This tends to occur during higher intensity exercise where the heart rate is higher (e.g. during moderate to fast jogging).

In this region the majority of calories burned during exercise are carbohydrates. However it is suggested that exercise at this intensity can boost the metabolic rate for a period upto 24 hours after the exercise has finished and as such you will be burning more calories than normal even after the exercise has finished.
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# Human ear is sensite to sound intensity ranging from db?

• The human is is not sensitive to sound intensity (energy), but the human ear is sensitive to sound pressure or to sound pressure level (SPL).It is ranging from 20 micropascals to 150 pascals, that is a SPL of 0 dB (threshold of hearing) to 137.5 dB (threshold of pain).Scroll down to related links and look at "Table of Sound Levels and corresponding Sound Pressure".

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• Answer: The human is is not sensitive to sound intensity (energy), but the human ear is sensitive to sound pressure or to sound pressure level (SPL).It is ranging from 20 micropascals to 150 pascals, that is a SPL of 0 dB (threshold of hearing) to 137.5 dB (threshold of pain).Scroll down to related links and look at "Table of Sound Levels and corresponding Sound Pressure".
• Answer: Acoustic power per area
W/m2 = Watts per square meter
• Answer: My sources tell me that it is in fact legal.
• Answer: A dangerous sound level is defined as above 85db to cause hearingdamage. Long term exposure to 80 db can also damage hearing.
• Answer: the average age is 14-18 or 14-17. other age ranges include 15-17 15-18 15-19 15-20 and 14-20, but the average is 14-18
• Answer: The US agency OSHA sets guidelines for workplaces that limit the intensity of sounds and their duration. A very loud sound (over 130 decibels) will cause pain. A lower volume (115 to 120 db) can damage human hearing organs almost immediately. Even lower levels, from 85 to 100 decibels, may cause injury with prolonged exposure. Sounds above 75 db can disrupt concentration or sleep (this is equal to a phone dial tone or city traffic).
It should be noted that much "heavy metal rock music" is amplified to a volume (over 120 decibels, up to 150 decibels) that is considered injurious, possibly causing hearing loss over time.