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Old 11-03-2010, 04:01 PM   #12
monkeydharma
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Join Date: Apr 2010
Location: Sierra Nevadas
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Rowenna, I just ran across your post...

I bought a different model (same brand) and the booklet with it states for hydration:

Age________Female_____Male
newborn___75%________80%
1-5________65%________65%
10-16______60%________60%
17-39______50%________60%
40-59______47%________55%
60+________45%________50%

For Bone Mass, it has this:

FEMALES: age 20-29 normal= 6.2-7%
FEMALES: age 30-39 normal= 6-6.8%
FEMALES: age 40-49 normal= 5.6-6.4%
FEMALES: age 50-59 normal= 5.2-6%
FEMALES: age 60-69 normal= 4.9-5.7%

MALES: age 20-29 normal= 7.6-8.4%
MALES: age 30-39 normal= 7.4-8.2%
MALES: age 40-49 normal= 7-7.8%
MALES age 50-59 normal= 6.6-7.4%
MALES age 60-69 normal= 6.3-7.1%


For those who were denigrating the use of the various figures, they can be of use depending on your health situation.

Body Fat % - obvious. When one diets WITHOUT exercise, they lose both fat, muscle mass and possibly bone density (depending on the diet type). Ideally your BF% should be going down as you diet, showing that you are exercising sufficiently to maintain muscle/bone mass.

Hydration % - while this is a relative from person to person, it can have importance. A lower % here can mean thicker blood, which can be problematic if you have a weak heart (as I do). Also water retention fluctuates a lot more than weight does, so comparing this figure can indicate if a weight gain/loss is actually water retention/loss instead of fat. I can 'gain' a pound or two, and realize it was because I retained water from having bacon at breakfast and ham at dinner - I didn't actually gain any real weight at all.

Bone Mass: this number can vary significantly between individuals. It's importance is that it doesn't go DOWN while you are dieting. While it isn't a direct bone density reading, you can infer bone density health by this figure, as denser bones are heavier (which provides a larger figure). Particularly with older dieters, calcium, vitamin D & exercise will help prevent osteoporosis. If this figure persistently goes down over time, then it makes sense to consult a doctor; if it goes UP, then I'd say kudos are in order for strengthening your bones. The figures given I suspect are just a generic range for health bones within age brackets.

Body Mass Index: I think we all know the use here. For height, weight and age, it gives you a general indication of how healthy your body size is. It has obvious limits - a weight trainer can have an 'overweight' BMI when he is obviously in good physical shape; a person can have a BMI in normal range, and have an extremely high body fat %, making them unhealthy. But for an average person who exercises moderately, it gives a quick idea of how you stand against the actuarial tables for longer life.
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