A Rat Model of Progressive Isometric Strength Training

This study presents an isometric model of strength resistance training in rats. Seven rats were trained for five weeks with increasing load, once a day for six days per week while seven rats served as control group. Mechanical strength of the hindlimb muscle group was measured on anaesthetised rats...

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Bibliographic Details
Published in:Archives of physiology and biochemistry 1999, Vol.107 (2), p.144-151
Main Authors: Lac, G., Cavalie, H.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Hindlimb - physiology
Isometric Contraction
Male
Muscle Fibers, Skeletal - ultrastructure
Muscle, Skeletal - physiology
Muscle, Skeletal - ultrastructure
Organ Size
Physical Conditioning, Animal - physiology
Rats
Rats, Wistar
Space life sciences
Striated muscle. Tendons
Tetany - physiopathology
Vertebrates: osteoarticular system, musculoskeletal system
Weight-Bearing
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Summary:This study presents an isometric model of strength resistance training in rats. Seven rats were trained for five weeks with increasing load, once a day for six days per week while seven rats served as control group. Mechanical strength of the hindlimb muscle group was measured on anaesthetised rats with a force transducer linked to the Achilles tendon after electrical stimulation of the sciatic nerve. Training resulted in a 74 ± 2% strength gain in experimental (E) vs control (C) rats and in a reduction of fatigability with no change in gastrocnemius, soleus and extensor digitorum longus weights. The fibres composition of the gastrocnemius showed a 50% increase of IIA fibres and a 17% fall of IIB fibres. Consequently, this new model of isometric training is suitable for physiological studies.
ISSN:1381-3455
1744-4160
DOI:10.1076/apab.107.2.144.4337