Local vibration inhibits H-reflex but does not compromise manual dexterity and does not increase tremor
MetadataShow full item record
The present work aimed at investigating the effects of local vibration on upper limb postural and kinetic tremor, on manual dexterity and on spinal reflex excitability. Previous studies have demonstrated a decrease in spinal reflex excitability and in force fluctuations in the lower limb but an increase in force fluctuation in the upper limbs. As hand steadiness is of vital importance in many daily-based tasks, and local vibration may also be applied in movement disorders, we decided to further explore this phenomenon. Ten healthy volunteers (26 ± 3 years) were tested for H reflex, postural and kinetic tremor and manual dexterity through a Purdue test. EMG was recorded from flexor carpi radialis (FCR) and extensor digitorum communis (EDC). Measurements were repeated at baseline, after a control period during which no vibration was delivered and after vibration. Intervention consisted in holding for two minutes a vibrating handle (frequency 75 Hz, displacement ∼7 mm), control consisted in holding for two minutes the same handle powered off. Reflex excitability decreased after vibration whilst postural tremor and manual dexterity were not affected. Peak kinetic tremor frequency increased from baseline to control measurements (P = 0.002). Co-activation EDC/FCR increased from control to vibration (P = 0.021). These results show that two minutes local vibration lead to a decrease in spinal excitability, did not compromise manual dexterity and did not increase tremor; however, in contrast with expectations, tremor did not decrease. It is suggested that vibration activated several mechanisms with opposite effects, which resulted in a neutral outcome on postural and kinetic tremor.
Human Movement Science;
Budini F, Laudani L, Bernardini S, Macaluso A (2017) 'Local vibration inhibits H-reflex but does not compromise manual dexterity and does not increase tremor', Human Movement Science, 55 (Oct 17), pp.221-228
This article was published in Human Movement Science on 01 September 2017 (online), available at http://dx.doi.org/10.1016/j.humov.2017.08.018
- Sport Research Groups 
Showing items related by title, author, subject and abstract.
Effect of whole body vibration frequency on neuromuscular activity in ACL-deficient and healthy males Giombini, A.; Menotti, F.; Laudani, Luca; Piccinini, A.; Fagnani, F.; Di Cagno, A.; Macaluso, A.; Pigozzi, F. (Termedia Publishing, 2015-07)Whole-body vibration (WBV) has been shown to enhance muscle activity via reflex pathways, thus having the potential to contrast muscle weakness in individuals with rupture of the anterior cruciate ligament (ACL). The present ...
Stathopoulou, Olympia (Cardiff Metropolitan University, 2017-06-01)This study examined the prospect of using three different mixing techniques using Plaster of Paris (Dental SP) and whether or not one would be revealed to have greater strength than the others. This project was carried ...
A comparison of the accuracy of three types of 3 dimensional scanners for recording patients' study models and the ease of use of each scanner. Alimohamed, Francis (Cardiff Metropolitan University, 2005)Statement of problem: Dental study models are classed as a patient's dental record and as a result, they need to be retained for a minimum amount of time for medico-legal purposes. With the ever-increasing dental care, the ...