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For anaerobic running (sprinting) use of glycogen as a substrate for energy will result in a high concentration of hydrogen ions and blood lactate. Although you may hear that blood lactate is responsible for "locking up" during these events, it is actually the [H+] that lowers the Ph of the blood and in turn causes your body to start protecting itself by blocking actin from attaching to myosin, thereby preventing muscle contraction.

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13y ago
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13y ago

well they "rip" and then you should let them be for a day to recover and when they do the rips heal and get bigger also, thus increasing the size and ability of the muscle

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Q: What causes the leg muscles to lock during running?
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