Move more, sleep better: Study finds physical activity lengthens REM latency
The study found that physical activity lengthened REM latency—that is, the time it takes to enter the REM stage. This may ...
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Agonist and antagonist muscle pairs
In an antagonistic muscle pair as one muscle contracts the other muscle relaxes or lengthens. The muscle that is contracting is called the agonist and the muscle that is relaxing or lengthening is ...