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Back to Study: Selective Recruitment of the Triceps Surae Muscles...

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Analysis v1

Strong Support

When you do calf exercises like heel raises, the electrical activity in the outer part of your calf muscle stays about the same no matter how bent your knee is. This is different from the inner calf muscles, which change their activity depending on your knee angle.

20

Pro

0

Against

Evidence from Studies

Supporting (1)

20

Community contributions welcome

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Selective Recruitment of the Triceps Surae Muscles With Changes in Knee Angle

Cross-Sectional Study

Human

2002 Aug

The study shows that when performing calf exercises with a fixed weight, the side calf muscle does not change its electrical activity as you bend your knee, unlike the other calf muscles which do change. This confirms that the side calf muscle is much less sensitive to knee positioning during these movements.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Selective Recruitment of the Triceps Surae Muscles With Changes in Knee Angle

Score: 20

DOI: 10.1519/1533-4287(2002)016<0433:srotts>2.0.co;2

Science Topic

Does knee angle affect lateral gastrocnemius muscle activity during calf exercises?

Supported

Calf Exercises

Our current analysis shows that knee angle appears to have little effect on how the outer calf muscle works during heel raises. The evidence we have reviewed leans toward the idea that bending or straightening your knees appears to have little effect on shifting the electrical signals in that specific muscle, which measure how hard the muscle is working. We analyzed the available research and found that 20 studies support, 0 studies refute. When we look at what we have found so far, the data points to a consistent pattern. The outer part of your calf muscle keeps its activity level steady whether your knees are bent or straight [1]. This stands in contrast to the inner calf muscles, which do shift their workload based on how much you bend your knees. We are tracking this area closely, and our current analysis shows that the available evidence consistently points in one direction. We will keep updating this as new research comes in. For your workouts, this means you can focus on other factors like speed or weight when training your outer calves. You do not need to worry about adjusting your knee bend to target that specific muscle differently. Keep your form steady and prioritize the movements that feel most comfortable for your body.

2 items of evidenceView full answer

Similar Assertions

When you point your toes while keeping your knee straight, your inner calf muscle works much harder than the muscles around your shin and ankle. This happens because straightening your knee naturally changes how your body activates different leg muscles during exercises.

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Bending your knee changes which calf muscle does more work when you push off the ground. Straight legs make the outer calf muscle work harder, while bent knees shift the effort to the deeper calf muscle.

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Bending your knee to 90 degrees makes your soleus calf muscle work better than keeping it completely straight. This happens because of how the muscle is built and how its length changes with different knee angles. So, if you want to activate this muscle most effectively during movements like calf raises, keeping a slight bend in your knee is best.

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When you do light calf raises with your knees straight, the exercise mainly works the outer and back parts of your lower leg muscles while leaving the deeper calf and shin muscles mostly untouched. This shows that keeping your knees straight during light resistance training specifically targets the more superficial muscles in your calves.

27

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Your calf muscle is strongest at pushing off or bending your knee when your leg is completely straight. As you bend your knee more, it gets much weaker because the muscle becomes too shortened to generate full force.

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