Table
3.
Evidence for Motor Unit Firing Frequency.
Author
Participants
Vibration Method (type)
Exercise
Type
Frequency
(Hz)
Amplitude
(mm)
Duration
Results
Bongiovanni and Hagbarth,
1990
5
H ♀
(♂, ♀ = NR)
Direct
vibration dorsiflexor muscles
SS
150
1.5
20-25
s
Vibration had no effect on firing
frequency of non-fatiguing muscle, however vibration caused an increase
in EMG, force and firing frequency during fatiguing isometric
maximal voluntary contractions.
Griffin
et al., 2001
7
H (3♂, 4♀)
Direct
Vibration triceps &
biceps brachii
Isometric
110
3
2
s
every 10 s
The firing frequency of the triceps significantly increased when vibration was
applied during 20% MVC
H = Healthy; SS = Static squat; MVC
= Maximal voluntary contraction