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Dan Robbins EMG Plantar Flexors
Transcript of Dan Robbins EMG Plantar Flexors
D.Robbins and M. Goss-Sampson
Background to Vibration
Novel training method – with long history
Charcot Marie 1880 .
Kellogg's Chair 1896 .
Vibrating Belt 1928 .
Background to the study
Increases in the strength and power of various muscles have been reported, but...
What influences the strength/power increases?
Are these changes muscle specific?
Ten healthy male subjects:
(age 27 +/- 5 years, height 1.78 +/- 0.04 m, weight 75.75 +/- 11.9 kg)
6 alternating sets of heel raises for 15 seconds with either no vibration (NVIB) or vibration (VIB).
All heel raise exercises were performed on a Power Plate pro6 (Power Plate International Ltd) whole body vibrating platform (40 Hz 1.9 mm vertical displacement)
3D motion tracking of vertical ankle displacement at 20Hz (Oqus3, Qualysis) with synchronised surface EMG (Delsys Inc. Boston, MA, USA).
No significant differences were observed in range of motion
(NVIB: 0.082 +/- 0.02 m, VIB: 0.079 +/- 0.002 m)
or in the time taken to complete each heel raise
(NVIB 1.96 +/- 0.02 s, VIB: 1.96 +/- 0.0 2 s)
Whole body vibration in the absence of additional resistance results in significant changes in sEMG amplitudes of soleus in healthy populations
Whole body vibration in the absence of additional resistance does not affect sEMG frequencies.
Whole body vibration in the absence of additional resistance does not affect the timing of muscle activity.
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A non significant increase in the median frequency was seen in both the lateral gastrocnemius (105 +/- 7 to 111 +/- 7 Hz) and in the soleus muscle (102 +/- 7.5 to 105 +/- 7.5 Hz) during the vibration conditions.