• Female and male athletes seem to respond to training in a comparable manner. As the quantity or intensity of training increases, aerobic capacity (V02max) shoots upward, body fat tends to decrease, and performance improves, regardless of gender. In spite of these parallel responses, males frequently achieve better performance times than similarly trained females. Part of the reason for this is that males routinely engage in a perfectly legal, natural form of 'blood doping'. The key male sex hormone - testosterone - promotes the production of haemoglobin, the oxygen-carrying protein found inside red blood cells, and testosterone also increases the concentration of red cells in the blood. The key female sex hormone, oestrogen, has no such effect. As a result, each litre of male blood contains about 150-160 grams of haemoglobin, compared to only 130-140 grams for females. The bottom line is that each litre of male blood can carry about 11 per cent more oxygen than a similar quantity of female blood.
• The "typical" young untrained male will have an absolute VO2 max of 3.5 liters/min, while the typical same-age female will be about 2 liters/min. This is a 43% difference, much of which is due to the fact that males are bigger, on average, than females. Humans are all rather geometrically similar, so heart size scales in proportion to lean body size . If we divide VO2 by bodyweight, the difference is diminished (45 ml/min/kg vs 38 ml/min/kg) to 15 to 20%, but not eliminated.
• The key male sex hormone, testosterone, also stimulated muscle mass development, while the principal female hormone, oestrogen, tended to enhance the accumulation of fat. (-__- how unfair. grr.)
• Some scientists have speculated that key differences in muscle composition or metabolism might also slow females down a bit. However, recent tests have determined that male and female runners have about the same percentages of 'fast-twitch' and 'slow-twitch' muscle fibres, and other research has documented that 'fuel burning' (actually, the rates of fat and carbohydrate oxidation) is very similar in males and females. That means that when just two things (percent body fat and V02max) are equalised between the sexes, the running performances of similarly trained males and females become pretty much the same.

Another amusing fact stumbled upon:

Are Men Sweatier than Women? YES!! hahahaa.

On an absolute basis, and per kg bodyweight, women have lower sweat rates than men. However, because of their higher body surface area to volume ratio, they dissipate heat equally well. Men have an advantage in evaporative cooling, but women have an advantage in radiant cooling, so they come out even.

Sources:

http://www.pponline.co.uk/encyc/0240.htm

http://home.hia.no/~stephens/gender.htm

p.s. lol, as you can tell, im bored and absolutely refuse to do my hw :P

p.p.s. the above is why you shouldn't complain about having to do harder PFT. if women had less fat, we would have to do it too XD AND guys get muscle more easily, which is bluddy lucky la! ><>