[quote]wushu_1984 wrote:
PLEASE IGNORE IF NOT A NERD:
Some super nerdage:
3.0lbs per inch gives {Height, BMI}:
{5’4",33}, {5’8",31}, {6’,29.3}, {6’4",27.8}
Average for 13 BMI’s between 5’4 to 6’4" = 30.22
[/quote]
Wushu, I like your rule, especially the thought of aiming for “obesity” as a goal.
Upping the nerdage level a bit (fair warning!)…
I’ve wondered before about the various lbs/inch values people toss around, like 3 lbs per each inch of your height vs. 5-10 lbs per inches of height difference when comparing people. Wushu’s comparison to 3 lbs/in shows his BMI rule is not too different but has some different trend with height.
Specifically, the rules agree for a 5’10" height, where both say 210 lbs is “big”. Wushu’s rule says your weight should scale like height squared to keep the same look, and at 5’10" and 210 lbs, that translates into 6.0 lbs/inch.
On the other hand, a physicist can’t help but say “consider the spherical human”, and define a “Body Sphericity Index”:
BSI = Mass (kg) / (Height (m))^3 or
BSI = 27700 * Weight (lbs) / (Height (inches))^3
If you shrink someone keeping all proportions the same, they’ll have the same BSI. (And if they are spherical, BSI = 524).
If I pick BSI = 17 as the cutoff for “bigness”, this matches Wushu’s rule and the 3 lbs/inch rule for a 5’10" guy. But changes in height translate into 9.0 lbs/inch.