Because of the intermittent cooling, continuous measurement over the investigation areas was not possible. There were therefore margins of variation in the length of the 4- to 5-min intervals between the measurements by which latency and regression times were defined. However, the protracted gradual administration of the local anaesthetic made the latency times so long that the range of error remained insignificant. The beginning and end of total voluntary motor blockade could always be recorded without measurements (cessation and recommencement of voluntary movements).
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