Exercise dependence?
Well some studies just make you go “eh?”
Researchers have hypothesized differences in exercise dependence and drive for muscularity between bodybuilders and power lifters, while others have not found the predicted differences. This study assessed 146 weight lifters (bodybuilders, n=59; power lifters, n=47; fitness lifters, n=40) on the Exercise Dependence Scale, Bodybuilding Dependence Scale, and the Drive for Muscularity Scale. Results showed that bodybuilders and power lifters were significantly higher than fitness lifters on EDS Total, 7 EDS scales, and the 3 BDS scales. In contrast, power lifters were found to be significantly higher on DMS Total and DMS Behavior scales than bodybuilders. The regression results suggest that exercise dependence may be directly related to the drive for muscularity.
First of all it is surprising that there are three scales:
- Exercise Dependence;
- Bodybuilding Dependence; and
- Drive for Muscularity.
So the more muscular you want to be, the more addicted you are to exercise. No real surprise, but it does make you think about how much exercise is driven by body image…. It is like Keith Thomas said about body image, in the context of Americans, but I think it is generally true about Britain too:
American popular culture, more than any other, is obsessed with body shape and images on American websites are generally representations of the website owner’s ideal or of people in progress along a before and after sequence. One of the most popular search terms which brings people to my website is ‘ideal male body shape’, but they’ll be disappointed to find uninspiring but honest pictures of me there – plus a critical discussion of the recent obsession with male body shape.
I am all for looking good but surely there is more to it …… like health?
March 9th, 2010 at 9:16 pm
Square area dependence on diagonal exercise?
Square diagonal increased by 20%, in how many % increased his area?
I know the answer, and it is 44%, but have no idea how to begin.
March 10th, 2010 at 2:18 am
If the linear dimension is increased by 20% length of lines are increased to 1.2 times the previous length.
Area changes in proportion to the square of the change in linear length.
A square of length 1.2 would have an area of (1.2)^2 = 1.44, reflecting that a change of 20% in length causes a change of 44% in area.
References :
retired math teacher
March 10th, 2010 at 2:20 am
Since the side of a square with diagonal d is d/√2, the Area A = d²/2.
If you increase the diagonal by 20%, the new diagonal is 1.20d and so the
new Area = (1.2d)² / 2 = 1.44(d²/2) = 1.44 A, which is 44% more thatn the original area A.
The general principle is that a change in a linear dimension results in the square of that factor in a quadratic dimension. For cubes, you woulod cube to find change in volume from a change in a linear measurement.
I have outlined the details for the square so that you can see how that happens in more detail.
References :
March 10th, 2010 at 2:22 am
Let the diagonal of a square = X
Let Y = the length of one side
Formula for the diagonal
Y^2 + Y^2 = X^2
Y^2 = X^2 / 2
Y^2 also happens to be the area, so the area of the square is:
X^2 / 2
(1.2 * X)^2 / 2 = (1.44 * X^2) / 2
so
Increasing X by 20% increases the area by 44%
References :