Post-tetanic responses in creatine-depleted rat EDL muscle.
The total creatine content of rat extensor digitorum longus (EDL) muscles is reduced from 26.7 mumol X g-1 to 5.2 mumol X g-1 after 4 weeks on a diet containing beta-guanidinopropionate. The resting muscles of these animals contain only 5% of the normal creatine phosphate and about 30% of the normal adenosine triphosphate (ATP). Isometric twitch and brief tetanic responses are not significantly different from normal. However, following a 1-second tetanus, the normal twitch potentiation (+80%) is reversed in depleted muscles (-40%). The initial suppression lasts 1-2 seconds and is followed by a small delayed potentiation (+25%). Relaxation rate, which is normally increased following a tetanus, is considerably reduced in depleted muscles. Reversal of potentiation appears to be due to a suppression of twitch activation. The suppression may result from a transient fall in delta GATP, which is thought to be a critical parameter in the uptake of Ca++ by the sarcoplasmic reticulum (SR).
D000818:Animals; D002245:Carbon Dioxide / Q000494:pharmacology; D003401:Creatine / Q000172:deficiency*; D004558:Electric Stimulation; D007537:Isometric Contraction; D008297:Male; D009119:Muscle Contraction; D009126:Muscle Relaxation; D009132:Muscles / Q000187:drug effects / Q000378:metabolism / Q000473:pathology / Q000502:physiology*; D009929:Organ Size; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values
D002245:Carbon Dioxide; D003401:Creatine