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What kind of contraction are the quadriceps going through in order to walk?
Wiki User
∙ 16y ago
Isotonic contractions during the entire motion of walking. They are undergoing isotonic concentric to extend the knee to reach out for the next step. Than after the foot lands on the ground the hamstrings contract, but the quadriceps perform isotonic eccentric contraction to help control the movement in order to prepare for the next step.
Wiki User
∙ 16y ago
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Is walking downhill a concentric or eccentric contraction of your quadriceps muscle?
Every step, whether going uphill, downhill, or on flat land, involves both an eccentric and concentric contraction.The eccentric contraction occurs when the quadriceps muscles lengthen as they load. In order for your quadriceps to lengthen, the knee must bend. Thus, the eccentric contraction in the walking motion occurs just after you step. This is perhaps more obvious with running than walking. After the foot touches the ground, the quadriceps is loaded eccentrically by the weight of the body as the knee bends.The concentric contraction of the quadriceps occurs then when the muscle shortens, as you push off from your foot. Again, this is probably more obvious with a running motion than walking motion. After the weight of your body has shifted onto the foot that is currently in contact with the ground (with your knee bent), your quadriceps contracts concentrically as the knee unbends and you lift your own body weight.So walking, even downhill, still involves both eccentric and concentric contractions. Walking (and running) downhill can lead to fatigue in your quadriceps due to the greater eccentric loading that occurs when going downhill. The range of muscle motion can be greater and your body is coming from "higher" up (its previous elevation on the hill), which can increase the load as well. As compared with concentric contractions, eccentric contractions can cause more damage to the muscle.
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The quadriceps are bigger because it controls your thighs so it must be bigger in order to lift your leg. As where your biceps is a muscle that controls your arm and also has a muscle to help it move. So the quadriceps are bigger and stronger.
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Muscles on one side of the joint have to relax in order for the muscles on the other side of the joint to contract. Example would be the quadriceps would have to relax and lengthen in order for the hamstrings to flex.
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