 First proposed in 1950, Spitzer resistivity stated that the electrical resistance of a plasma was reduced as the temperature increased, meaning the heating rate of the plasma would slow as the devices improved and temperatures were pressed higher.Calculations demonstrated that the resulting maximum temperatures while staying within "q" > 1 would be limited to the low millions of degrees.Artsimovich had been quick to point this out in Novosibirsk, stating that future progress would require new heating methods to be developed.