A comparison of the relaxation rate of Gastrocnemii: effect of fasting in frog and uromastix. | [International Journal of Biology and Biotechnology • 2004]

Author(s):

1. A. Anwar: Neuromuscular Unit, Department of Physiology, University of Karachi, Karachi, Pakistan

2. M. A. Azeem: Neuromuscular Unit, Department of Physiology, University of Karachi, Karachi, Pakistan

3. A. Erum: Neuromuscular Unit, Department of Physiology, University of Karachi, Karachi, Pakistan

4. A. Sadaf: Neuromuscular Unit, Department of Physiology, University of Karachi, Karachi, Pakistan

Abstract:

Generally, fasting animals show impaired skeletal muscle performance in terms of decreased (Olasunkanmi et al., 2002) or increased (Lynelle et al., 2001) relaxation rate. In order to determine whether this observation mainly depends on the type of animal model, the gastrocnemius muscles of non-fasting and fasting (10 days). Frogs and Uromastrix were used to tetanize them with continuous stimuli. Fasting has been found to reduce the relaxation rate of Uromastix gastrocnemii, while in frogs it is enhanced. However, on continuining the tetanic simulation the relaxation rate declined gradually in both the Frog and Uromastix. Further, the effect of fasting on the initial decline in relaxation rate on continuous tetanic simulation has been found to increase after fasting in Frog’s gastrocenemii and decrease in Uromastix gastrocnemii. On the basis of obtained results it was concluded that the effect of fasting on skeletal muscle relaxation rate differs in different animals probably depending on their muscles architecture and physiology.

Page(s): 405-411

DOI: DOI not available

Published: Journal: International Journal of Biology and Biotechnology, Volume: 1, Issue: 3, Year: 2004

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