9 votes
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Is there an optimal body fat percentage?

Currently I am not aware of any scientifically based recommendations for levels of healthy body fat. There are empirical observations and actuarial tables/considerations, but there hasn't been a ...
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  • 6,540
8 votes
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Does having more muscles influence blood pressure measurement?

There is evidence that a muscular arm will produce a higher systolic reading if the wrong sized cuff is applied. There are two measurements in a blood pressure reading, the systolic and the diastolic....
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  • 6,540
7 votes
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Are medical units pertaining to blood-tests, etc. standard/universal? Or vary from country to country?

While the measured quantities are the same across border, both names and units can vary. The main difference is often the unit used for the concentration of each analyte : either mass per volume or ...
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  • 241
7 votes
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Markings on a 3ml syringe

Minim (unit): Part of the Apothecary system. It is rarely used anymore(some countries and areas still use the apothecary system) and is a alternative to the drop(which was formerly the smallest unit ...
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  • 2,952
7 votes

Does BMR adjust and decrease in response to calorie restriction diets?

First of all, the 1000-2500 calorie statement from the answer to this question is not due to formula inaccuracies (only 0.5% of the variation were attributed to that), but is the actual measured BMR ...
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  • 781
5 votes
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Is there a medical term for the thickness of the human torso, as measured from its back to its front?

Sagital abdominal diameter is measured: after a normal expiration while in the supine position with bent knees on a firm examination table and without clothes in the measurement area (Fig. 1)... at ...
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  • 2,424
5 votes
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Wrist Blood Pressure Monitor Accuracy?

Take both to your doctor's office the next time and compare them to the manual cuff. There are many models that can be calibrated that way. Not all models are as accurate as others. This article ...
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  • 5,694
4 votes
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Does BMR adjust and decrease in response to calorie restriction diets?

Yes it can. As a general statement, I'm not sure how much it can go down before it's a problem, which is what I think you are asking as your second question. Starving to death might be seen as this ...
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  • 1,836
3 votes
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Melanocyte count in our skin

The count of melanocytes per square mm depends on the body region and 1500 seems to be the upper limit. Interestingly in different races, the number of melanocytes is THE SAME. Quoting from:...
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  • 354
2 votes
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Why is blood glucose measured using molar concentration internationally?

Short answer Using mmol/L helps with revealing some useful relationships between groups of analyzed substances while using mg/dL might obscure those relationships. Long anwer I wasn't able to find ...
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2 votes
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Could sleep apena outcomes be improved by adding sensors to measure the location and movement of the jaw?

There are specialists who do different degrees of positional assessments - specifically orthodontists, dentists, or maxillofacial surgeons (usually those who specialize in TMJ). Also, some practicing ...
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  • 5,694
2 votes

Could sleep apena outcomes be improved by adding sensors to measure the location and movement of the jaw?

As I pointed out in the comments under your other related question, mandibular advancement devices are not a new idea. From my experience as a diagnosed sufferer of chronic OSA (Obstructive Sleep ...
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  • 5,872
2 votes

What are normal values for EMG/nerve conduction studies?

This paper might be of interest to you (1) They have attempted to summarize together a table of the values for the common upper and lower limb nerves including both sensory and motor. It is quite ...
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1 vote

Why are health/epidemiology measures usually multiplied by 1,000, 10,000, 100,000, etc.?

Just for convenience, like you point out. The same thing is done in nearly every science, often by changing the SI units scale. We talk about weights of humans in kilograms, but measure drug doses in ...
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1 vote
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What (if any) are the measurement units for neurotransmitters?

These substances are measured in mass concentration (Example: Dopamine), that is, mass per volume. The standard SI unit for this is mg/ml, but I've also seen ng/ml or other units. This is because ...
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  • 6,596
1 vote

gauge R&R of time varying data: how to discriminate between equipment variation and actual signal variation?

If you measure only your heart rate, you can only provide measures of the "population" of your own heart rate. You should not take a sample from one individual as indicative of the population of all ...
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  • 121
1 vote

Unit of the daily recommended amount of calories

That figure is in kilocalories. A human needs about 2000 kilocalories per day. Sometimes a kilocalorie is described as a "big calories or a "Calorie", but to me that's more confusing than helpful.
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  • 211
1 vote

What level of alcohol in food is dangerous for children?

Google "alcohol content of bread" and you'll see: 1.9% Alcohol. However, during the baking process, most of the alcohol in the dough evaporates into the atmosphere. This is basically the same ...
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1 vote

Who decides the "normal" values for blood count?

Generally these decisions are "made" by work groups of specialists in the field. Your question is very general. There are so many measurements that can be done from blood samples that there is no way ...
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  • 431
1 vote

How many mL of blood is typically drawn for a HIV blood test?

HIV blood tests (for antigens and antibodies) are, at least where I practice, 4mL. However, if your doctor wants other blood tests she might add 1-2 vials of the same size. Depends on the organisation ...
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1 vote

Normal resting heart rate and how to measure it

You must consider here why you want to measure your resting heart rate. While one may argue whether you should measure it in the morning while you are still in bed or after you have eaten breakfast, ...
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