Abstract
The objective of the study was to investigate the chronic effect of low frequency whole body vibration (WBV) on isometric and eccentric strength of knee extensors with different force exertion capacity. It was hypothesized that (1) four-week WBV intervention with the low frequency domain would enhance muscle strength and (2) the improvement would be more pronounced in the weaker muscle. To test our hypothesis twenty patients with acute stroke were recruited. Ten patients were randomly assigned to vibration and the remaining ten patients served for control.The patients in the vibration group received WBV with 20 Hz frequency three times per week standing on a vibration platform in half squat position meanwhile flexing and extending the joints and placing the weight from one leg to the other. Knee extensor strength was determined under isometric and eccentric contraction before and after WBV intervention. Myoelectrical activity (EMG) of the vastus lateralis muscle was also measured.Significant improvement was revealed in the vibration group only. The maximum isometric torque and EMG activity increased significantly for both paretic and non-paretic leg, but the improvement was threefold greater in the vibration group. No significant alteration was found in rate of torque development. Maximum eccentric torque and EMG increased significantly for the paretic leg only. Mechanical work enhanced significantly in the paretic side only.The results of our study indicate that the selection of the effective vibration frequency depends upon the physical condition of neuromuscular system. Low vibration frequency intervention can increase the strength in weak muscles due to neuromuscular impairment and restricted physical activity.
| Original language | English |
|---|---|
| Pages (from-to) | 172-182 |
| Number of pages | 11 |
| Journal | Acta Physiologica Hungarica |
| Volume | 97 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jun 1 2010 |
Fingerprint
Keywords
- chronic effect
- EMG
- isometric and eccentric contraction
- knee extensor strength
- knee extensors
- patients with stroke
- vastus lateralis muscle
- whole body vibration
ASJC Scopus subject areas
- Physiology (medical)
Cite this
Low resonance frequency vibration affects strength of paretic and non-paretic leg differently in patients with stroke. / Tihanyi, J.; Di Giminiani, R.; Tihanyi, T.; Gyulai, G.; Trzaskoma, L.; Horváth, M.
In: Acta Physiologica Hungarica, Vol. 97, No. 2, 01.06.2010, p. 172-182.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low resonance frequency vibration affects strength of paretic and non-paretic leg differently in patients with stroke
AU - Tihanyi, J.
AU - Di Giminiani, R.
AU - Tihanyi, T.
AU - Gyulai, G.
AU - Trzaskoma, L.
AU - Horváth, M.
PY - 2010/6/1
Y1 - 2010/6/1
N2 - The objective of the study was to investigate the chronic effect of low frequency whole body vibration (WBV) on isometric and eccentric strength of knee extensors with different force exertion capacity. It was hypothesized that (1) four-week WBV intervention with the low frequency domain would enhance muscle strength and (2) the improvement would be more pronounced in the weaker muscle. To test our hypothesis twenty patients with acute stroke were recruited. Ten patients were randomly assigned to vibration and the remaining ten patients served for control.The patients in the vibration group received WBV with 20 Hz frequency three times per week standing on a vibration platform in half squat position meanwhile flexing and extending the joints and placing the weight from one leg to the other. Knee extensor strength was determined under isometric and eccentric contraction before and after WBV intervention. Myoelectrical activity (EMG) of the vastus lateralis muscle was also measured.Significant improvement was revealed in the vibration group only. The maximum isometric torque and EMG activity increased significantly for both paretic and non-paretic leg, but the improvement was threefold greater in the vibration group. No significant alteration was found in rate of torque development. Maximum eccentric torque and EMG increased significantly for the paretic leg only. Mechanical work enhanced significantly in the paretic side only.The results of our study indicate that the selection of the effective vibration frequency depends upon the physical condition of neuromuscular system. Low vibration frequency intervention can increase the strength in weak muscles due to neuromuscular impairment and restricted physical activity.
AB - The objective of the study was to investigate the chronic effect of low frequency whole body vibration (WBV) on isometric and eccentric strength of knee extensors with different force exertion capacity. It was hypothesized that (1) four-week WBV intervention with the low frequency domain would enhance muscle strength and (2) the improvement would be more pronounced in the weaker muscle. To test our hypothesis twenty patients with acute stroke were recruited. Ten patients were randomly assigned to vibration and the remaining ten patients served for control.The patients in the vibration group received WBV with 20 Hz frequency three times per week standing on a vibration platform in half squat position meanwhile flexing and extending the joints and placing the weight from one leg to the other. Knee extensor strength was determined under isometric and eccentric contraction before and after WBV intervention. Myoelectrical activity (EMG) of the vastus lateralis muscle was also measured.Significant improvement was revealed in the vibration group only. The maximum isometric torque and EMG activity increased significantly for both paretic and non-paretic leg, but the improvement was threefold greater in the vibration group. No significant alteration was found in rate of torque development. Maximum eccentric torque and EMG increased significantly for the paretic leg only. Mechanical work enhanced significantly in the paretic side only.The results of our study indicate that the selection of the effective vibration frequency depends upon the physical condition of neuromuscular system. Low vibration frequency intervention can increase the strength in weak muscles due to neuromuscular impairment and restricted physical activity.
KW - chronic effect
KW - EMG
KW - isometric and eccentric contraction
KW - knee extensor strength
KW - knee extensors
KW - patients with stroke
KW - vastus lateralis muscle
KW - whole body vibration
UR - http://www.scopus.com/inward/record.url?scp=77954484947&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77954484947&partnerID=8YFLogxK
U2 - 10.1556/APhysiol.97.2010.2.3
DO - 10.1556/APhysiol.97.2010.2.3
M3 - Article
VL - 97
SP - 172
EP - 182
JO - Physiology International
JF - Physiology International
SN - 2498-602X
IS - 2
ER -