32
Rev.05.15
two types. Studies on the distribution of fibers in the muscle mass have highlighted
the close relation between the motoneuron (tonic or phasic) and the functional
characteristics of the fibers it innervates and, moreover, they have shown how a
specific motor activity (particularly sports) can bring about a functional adaptation
of fibers and a change in their metabolic characteristics.
Motor unit type
Contraction type
Contraction frequency
Tonic ST
Slow contraction I
0 - 50 Hz
Phasic FT
Fast contraction II
50 - 70 Hz
Phasic FTb
Fast contraction II b
80 - 120 Hz
Stimulation intensity
The current intensity necessary to obtain a muscular contraction is personal and
depends on the position of the electrodes, the underlying adipose tissue, sweating,
the presence of hair on the treatment field, etc.. Therefore, the same current
intensity may generate different feelings according to different persons, days and
sides of the body. During the same working session, it will be necessary to regulate
the intensity in order to obtain the same level of contraction because of the
accommodation phenomenon. The current intensities recommended in the
different phases are proposed as indicative values, and each person should modify
these levels according to his/her personal needs.
- Moderate intensity. The muscle does not tire, not even during prolonged
treatments. The contraction induced is tolerable and pleasant. This is the first level
on the graphic representation of intensity.
- Intermediate intensity. The muscle is visibly contracted but the stimulation does not
cause the movement of the joints. This is the second level on the graphic
representation of intensity.
- Elevated intensity. The muscle is contracted substantially. The muscular contraction
will cause the extension or bending of the limb if this is not blocked. This is the third
level on the graphic representation of intensity.
- Maximum intensity. The muscle is contracted maximally. This is an intense
treatment that should be performed only after having executed different
applications at lower intensity.
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