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Low-frequency fatigue is fibre type related and most pronounced after eccentric activity in rat medial gastrocnemius muscle.
- Source :
-
Pflugers Archiv : European journal of physiology [Pflugers Arch] 2003 Nov; Vol. 447 (2), pp. 239-46. Date of Electronic Publication: 2003 Sep 24. - Publication Year :
- 2003
-
Abstract
- Effects of fibre type composition and type of contraction on low-frequency fatigue (LFF) were investigated in isolated rat medial gastrocnemius (GM) muscle. Fast oxidative or fast glycolytic GM muscle parts of anaesthetised male Wistar rats (n=18) were activated selectively by maximal electrical stimulation of the nerve after selective cutting of sub-branches. LFF was induced by a series of 40 isometric, concentric or eccentric contractions. Post exercise (55 min), the force-frequency curves differed significantly from the pre-exercise curves. Decreased forces were exerted mainly at the lower frequencies. This effect was significantly greater for glycolytic than oxidative muscle parts and following eccentric compared to isometric and concentric exercise. Seventy minutes following eccentric exercise, the relative values of the 60:200 Hz force ratios for the oxidative compared to the glycolytic parts were 65.6+/-2.2% and 43.6+/-4.6% (mean+/-SE) of the pre-fatigue values (=100%), respectively. In conclusion, for conditions of identical activation, eccentric exercise led to significantly more LFF than isometric and concentric exercise. In addition, and independent of the exercise type, fast glycolytic muscle parts were more susceptible to LFF than fast oxidative muscle parts.
- Subjects :
- Animals
Electric Stimulation
Glycolysis
Isometric Contraction physiology
Male
Muscle Fibers, Skeletal metabolism
Muscle, Skeletal metabolism
Oxidation-Reduction
Rats
Rats, Wistar
Recovery of Function
Time Factors
Muscle Contraction physiology
Muscle Fatigue physiology
Muscle Fibers, Skeletal physiology
Muscle, Skeletal physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0031-6768
- Volume :
- 447
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Pflugers Archiv : European journal of physiology
- Publication Type :
- Academic Journal
- Accession number :
- 14508688
- Full Text :
- https://doi.org/10.1007/s00424-003-1172-2