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INTRODUCTION When a muscle undergoes an unfused tetanus, it may display a decline in force following the initial rise. This effect, known as sag, occurs independent of fatigue and its presence or absence is regularly used to distinguish fast from slow motor units . Its use has been further expanded to distinguish fast fatigable from fast fatigue-resistant motor units . Despite its great utility, the precise mechanism responsible for sag is unknown. It is understood that in a series offatcat:u3y657h4rfevbiygxhvxqoalsy