Dr. Stacy Sims

So men have around 100% more aromatized testosterone as compared to women. So this increases the carrying capacity of oxygen, which means it goes to the muscles, can deliver more fuel to the muscles to be able to contract better. have more power and more strength.

So men have around 100% more aromatized testosterone as compared to women. So this increases the carrying capacity of oxygen, which means it goes to the muscles, can deliver more fuel to the muscles to be able to contract better. have more power and more strength.

Not that they breathe more. When we're talking about oxygen carrying capacity, this is... The amount that you're taking into the lungs, how it transfers to the red cells to then be able to go to the working muscles to give the muscles the available fuel to do a contraction. So it's not a respiratory rate. It's the ability for you to breathe in and how fast that can be conducted to the muscle.

Not that they breathe more. When we're talking about oxygen carrying capacity, this is... The amount that you're taking into the lungs, how it transfers to the red cells to then be able to go to the working muscles to give the muscles the available fuel to do a contraction. So it's not a respiratory rate. It's the ability for you to breathe in and how fast that can be conducted to the muscle.

It's more of a power and speed factor. Okay.

It's more of a power and speed factor. Okay.

Yep.

Yep.

So when we're looking at, I guess, world records, right, that have been kept, and we see there's a gender gap there. And this is slowly closing in the endurance world, but that has to do with muscle morphology with regards to being able to go long and slow.

So when we're looking at, I guess, world records, right, that have been kept, and we see there's a gender gap there. And this is slowly closing in the endurance world, but that has to do with muscle morphology with regards to being able to go long and slow.

When we're looking at the sprint capacity, where we have to have a quick transference of oxygen and quick muscle contraction, that gap isn't closing. And that is because we have smaller, long, smaller heart. We have less blood volume. We have less red cells. So the overall capacity for quickly developing power and speed is at a smaller, I guess it's a limited capacity in women versus men.

When we're looking at the sprint capacity, where we have to have a quick transference of oxygen and quick muscle contraction, that gap isn't closing. And that is because we have smaller, long, smaller heart. We have less blood volume. We have less red cells. So the overall capacity for quickly developing power and speed is at a smaller, I guess it's a limited capacity in women versus men.

So we're looking at resistance training itself. We see that women relative to men can accommodate and develop muscle just as well as men in the lower body, but upper body, not so much.

So we're looking at resistance training itself. We see that women relative to men can accommodate and develop muscle just as well as men in the lower body, but upper body, not so much.

Yeah, because your forces are going to be in a more linear fashion. So you have more even distribution of the force through the knee. But for women, as you're going to describe, our hips are wider. So we have more of an angle to the knee. And the forces aren't distributed evenly when we land. So when we look at that, as well as the quad dominance that develops for women.

Yeah, because your forces are going to be in a more linear fashion. So you have more even distribution of the force through the knee. But for women, as you're going to describe, our hips are wider. So we have more of an angle to the knee. And the forces aren't distributed evenly when we land. So when we look at that, as well as the quad dominance that develops for women.

So that means that we use our front muscles of our legs, our quads, a lot more than our hamstrings, our posterior chain. So we don't use our glutes and our hamstrings by default as well as men do. We're being pulled forward more and we put more emphasis on the front of our body because the quads tend to take the bulk of the muscle work that we're trying to do.

So that means that we use our front muscles of our legs, our quads, a lot more than our hamstrings, our posterior chain. So we don't use our glutes and our hamstrings by default as well as men do. We're being pulled forward more and we put more emphasis on the front of our body because the quads tend to take the bulk of the muscle work that we're trying to do.

Unless we're really trying to train hamstrings and glutes to fire, which isn't the default for women's bodies because center of gravity again is lower and you tend to lean forward. So when we're looking at ACL injury, again, it comes down to one, training stress, two, mechanics.

Unless we're really trying to train hamstrings and glutes to fire, which isn't the default for women's bodies because center of gravity again is lower and you tend to lean forward. So when we're looking at ACL injury, again, it comes down to one, training stress, two, mechanics.