![]() So, the longer you hold a position, there will be a series of fibers that were initially activated that will need to relax, and new fibers will be activated,” Gagliardi explains. “Your body is going to signal or activate the right amount of fibers for what you’re asking those fibers to do. Instead, your fibers divvy up the work - some fibers work while the others rest, and then they swap places. Anytime you contract your muscles, your nervous system sends chemical messengers to the target muscle (or muscles) via nerve cells known as motor neurons, which tell the muscle fibers to contract.īut all the muscle fibers in a given muscle or muscle group don’t contract at the same time. To understand how fatigue plays a role, we first need to look at what goes on inside your body when your muscles contract.Ĭontracting a muscle seems simple on the surface, but there’s actually a lot of activity going on inside your body to make that action possible. One of the most common reasons for muscle shakes is fatigue. “If a client said was happening when they’re not working out, I would send them to their doctor,” says Christopher Gagliardi, certified strength and conditioning specialist, ACE-certified personal trainer and ACE resource center manager.īut if your shakes are limited to your workout sessions, rest assured there are three common - and perfectly normal - causes for them. ![]() We’ll come to the first question in a moment, but to answer the second question, muscle shakes during exercise aren’t something you need to worry about - unless it persists outside of the gym. ![]() ![]() Why do our muscles shake? And should we be worried when it happens? We’ve all felt it at one time or another: That trembling, shaky feeling in your muscles when your workout gets tough, or you’ve been holding a pose ( like a plank) for too long. ![]()
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