12.2.2.2 Type of establishment of the electrical stimulation wave
According to Weiss’ law 𝑄𝑖𝑡+
therefore 𝐼𝑡 𝑖𝑡+
therefore (𝐼 𝑖 𝑡
with 𝑖 = rheobase
𝑖 is a current which resists the stimulation current 𝐼
If the stimulation current 𝐼 has a value lower than 𝑖 (i.e. the rheobase), it cannot be used because it cannot
change the resting potential by accumulating electrical charges in the excitable membrane (Fig. 1).
Analysis of the dierent ways to establish the stimulation current
The pulse times t1, t2 and t3 cannot be used since during these periods 𝐼𝑖.
Rheobase
Fig. 1
Fig. 2
Only one way of establishing the electrical stimulation wave is eective immediately, which is vertical
(Fig. 2).
In this case, there is no delay in its ecacy and the duration of the electrical wave is further reduced by it.
The stimulation current established vertically with
a value higher than 𝑖, the rheobase, instantaneously
produces an accumulation of charges modifying the
resting potential.
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