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1 2 . e l e c t r O t H e r a P y t H e O ry
100 EN WIRELESS PROFESSIONAL
12.2.2.2 type of establishment of the electrical stimulation wave
According to Weiss’ law
𝑄 = 𝑖𝑡 + 𝑞
therefore
𝐼 𝑡 = 𝑖𝑡 + 𝑞
therefore
(𝐼 − 𝑖) 𝑡 = 𝑞
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 different ways to establish the stimulation current
The pulse times t1, t2 and t3 cannot be used since during these periods
𝐼 < 𝑖
.
Rheobase
Fig. 1
Fig. 2
Only one way of establishing the electrical stimulation wave is effective immediately, which is vertical
(Fig. 2).
In this case, there is no delay in its efficacy 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.