Influence of 5-week whole body vibration training on motor unit contractile properties in the rat medial gastrocnemius muscle

• Autorzy: Lochynski D. , Celichowski J. , Kaczmarek D. , Krutki P.
• Języki publikacji: EN

Abstrakty

EN

The aim of the study was to determine the effect of the whole body vibration training on motor unit contractile properties in rat medial gastrocnemius.Two groups of Wistar rats trained 30 s (V30, n=4) or 4 × 30 s (V120, n=4) daily, 5 days weekly, for 5 weeks on vibratory platform (Power Plate®, USA, 2 mm vibration at 50 Hz) were compared to the control group (C, n=10). The employed vibration excited motor units through the stretch refl ex loop. Functional isolation of units was achieved by electrical stimulation of thin fi laments of the ventral roots. A total of 267 motor units were studied (56 in V30, 69 in V120, and 142 in C). They were classifi ed into: fast fatigable (FF), fast resistant to fatigue (FR) and slow (S) types.In the V30 and V120 group, no changes in the distribution of motor unit types were noted. For both groups the specifi c and the only change was a signifi cant increase in the twitch and maximal tetanus force in FF motor units. Additionally, for V120 group an increase in maximal tetanus force of S units was noted. For V120 group the contraction and relaxation times shortened in fast motor units and FF motor units became also less resistant to fatigue. It is shown that only a little increased daily physical activity induced by vibration considerably infl uences motor unit properties and FF motor units seem to be the most sensitive to vibratory stimulus.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2009
• Tom: 69
• Numer: 3
• Opis fizyczny: p.327-328

Twórcy

autor

Lochynski D.

• Department of Neurobiology, University School of Physical Education in Poznan, Poznan, Poland

autor

Celichowski J.

• Department of Neurobiology, University School of Physical Education in Poznan, Poznan, Poland

autor

Kaczmarek D.

• Department of Neurobiology, University School of Physical Education in Poznan, Poznan, Poland

autor

Krutki P.

• Department of Neurobiology, University School of Physical Education in Poznan, Poznan, Poland