Different types of muscle fibers in your calf muscles don't affect how much they grow from lifting heavy or light weights, because both the mostly slow-twitch and mixed fiber muscles grew about the...

After eight weeks of strength training, different calf muscles grow at the same rate regardless of whether they are made up of slow-twitch or mixed muscle fibers. This means you don't need to change your workout routine based on your muscle fiber type to get the best results.

When people do strength training, the outer calf muscle grows more than the inner calf muscles, no matter how they lift weights. This shows that some muscles naturally grow faster than others.

When untrained young men lift weights until they can't lift anymore, their calf muscles grow bigger by 7-14%, no matter how heavy the weights are. This shows that pushing hard is what makes muscles grow, not how heavy the weight is.

When guys who work out a little bit lift heavy weights (85% of their max), their triceps muscles grow faster and more reliably than when they lift light weights (30% of their max)—so how heavy you lift might change when your muscles start getting bigger.