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1. Changes in the levels of phosphocreatine (PCr) and ATP during relaxation after tetanic contraction have been observed and compared with the heat + work production during the same period.

2. The results were the same using 2 sec or 15 sec tetani and using 15 or 30 Hz stimulation.

3. During relaxation the mean chemical change (of ATP + PCr) was -0·105 ± 0·078 µmol/g muscle (n = 53). This change is less than would be required to explain the heat + work produced.

4. The PCr split during both 2 sec and 15 sec tetani (up to the last stimulus) was less than would be required to explain the heat + work produced. This confirms previous experiments.

5. It is concluded that the discrepancy between chemical change and heat + work production does not diminish during relaxation but actually increases.