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. 1989 Apr 15;259(2):589–592. doi: 10.1042/bj2590589

A gated 31P-n.m.r. study of bioenergetic recovery in rat skeletal muscle after tetanic contraction.

R A Challiss 1, M J Blackledge 1, E A Shoubridge 1, G K Radda 1
PMCID: PMC1138549  PMID: 2719669

Abstract

1. Gated 31P-n.m.r. spectra were obtained from the ankle flexor muscles of the rat at various times after 3 s isometric tetanic contraction. This allowed the time course of changes in phosphocreatine (PCr), Pi and free ADP concentrations and intracellular pH to be monitored in skeletal muscle in vivo with 1 s time resolution. 2. ATP concentration did not change significantly, either during the recovery from a 3 s tetanus or during the overall protocol. 3. The calculated rate of recovery of ADP towards pre-stimulation levels was very rapid (t1/2 less than 5 s). The rate of Pi disappearance (t1/2 = 14 s) was more rapid than the rate of PCr synthesis (t1/2 = 24 s), resulting in a significant transient decrease in n.m.r.-visible PCr + Pi between 25 and 45 s after tetanic contraction. 4. The rates of PCr, Pi and ADP recovery are higher than those previously reported for recovery from steady-state exercise in humans or twitch isometric contraction in animals.

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Selected References

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