Effects of progressive weight lifting training on motor unit contractile properties

• Autorzy: Lochynski D. , Kaczmarek D. , Mrowczynski W. , Celichowski J.
• Języki publikacji: EN

Abstrakty

EN

Strength training increases muscle strength and contractile speed. The purpose of the study was to examine basic motor unit (MU) contractile properties of medial gastrocnemius muscle after 5 week progressive strength training in adult rats. Three and half mo rats were randomly assigned to the two groups: untrained control and progressive weight lifting (PWL). Conditioned by food reward PWL rats performed “squat-rise to toes-squat” type exercises 5 days/week in the custom made apparatus, which intensity grew from 70 up to 85% of one-repetition maximum during applied training period. MUs were functionally isolated by ventral root filament splitting, and classified according to the fatigue index and “sag” property into slow (S), fast resistant to fatigue (FR) and fast fatigable (FF). For analysis, the peak force of the maximum tetanic contraction and the peak force and the contraction and relaxation times of the twitch were studied. The peak tetanus force increased in S and FR MUs. The twitch contraction time was shortened and the twitch-to-tetanus force ratio decreased in FF and FR MUs. These initial data indicate that a short-term PWL increases force of S and FR MUs and speed of contraction of fast MUs within fast-twitch skeletal muscle.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2013
• Tom: 73
• Numer: Suppl.1
• Opis fizyczny: p.34

Twórcy

autor

Lochynski D.

• Department of Neurobiology, University School of Physical Education, Poznan, Poland
• Department of Motor Rehabilitation, University School of Physical Education, Poznan, Poland

autor

Kaczmarek D.

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

autor

Mrowczynski W.

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

autor

Celichowski J.

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