Glycogen depletion patterns in the muscle of standardbred trotters after exercise of varying intensities and durations.
Abstract: The glycogen depletion patterns in the gluteus muscle of Standardbred horses were studied under different trotting intensities. After racing significant glycogen depletion was found in all Type I and IIA fibres and in a varying percentage of Type IIB fibres, depending on the individual horse. When horses performed exercise over a short distance (5 to 8 km) at three different speeds, glycogen depletion was difficult to detect for the faster speeds (10 and 8 m/sec) but notably involved a major proportion of Type I fibres at the slowest speed (6 m/sec). When exercise was prolonged over a greater distance a larger proportion of Type IIA fibres were depleted at faster speeds (8 m/sec) than at slower speeds over the same distance. However, when slow trotting was continued over even greater distances, a gradual increase in the percentage of glycogen depleted Type IIA fibres was noticed. Very significant glycogen depletion in all three fibre types was seen in all horses where a near maximal exercise tolerance test was performed 3 h after the longest and slowest exercise run. In a further study of glycogen depletion, during a near maximal exercise tolerance test on a graded treadmill with consecutively increasing velocity, depletion was seen in a proportion of all three fibre types with the highest proportion being Type I and the lowest Type IIB.
Publication Date: 1986-11-01 PubMed ID: 3803363DOI: 10.1111/j.2042-3306.1986.tb03697.xGoogle Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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This research article investigates how the glycogen stores in the muscles of Standardbred trotting horses deplete at varying levels of exercise intensity and duration. The researchers find that both the type of muscle fibre and the intensity and duration of the exercise impacts the rate of glycogen depletion.
Glycogen Depletion in Type I and IIA Fibres
- The research showed that after a race, all of the Type I and IIA fibres in the muscles of the horses showed significant glycogen depletion. This was also observed to some extent in Type IIB fibres, though the extent of depletion in these fibres varied between individual horses.
- For quicker speeds during short distances (5 to 8 km), glycogen depletion was less clear, particularly in the fastest trotting speeds of 10 and 8 m/sec. However, at slower trotting speeds of 6 m/sec, the researchers found that a significant amount of the glycogen in Type I fibres had been depleted.
Glycogen Depletion under Prolonged and Intense Exercise
- When horses were made to exercise over greater distances, glycogen in Type IIA fibres began to deplete more rapidly at higher speeds. This was not the case at slower speeds over the same distance.
- However, even at slower speeds, when the distances trotted were further increased, there was a gradual increase in glycogen depletion in Type IIA fibres.
Maximal Exercise Tolerance Test Results
- The research also observed very significant glycogen depletion in all three fibre types (Type I, IIA, and IIB) when a near maximal exercise tolerance test was undertaken three hours after the longest and slowest exercise run.
- During a similar maximal exercise tolerance test on a treadmill, which gradually increased the speed of exercise, the glycogen depletion was evident in all three fibre types, with the most significant depletion seen in Type I fibres and the least in Type IIB fibres.
In all, these findings point to the unique ways in which different types of muscle fibres react to varying intensity and duration of trotting exercise in terms of glycogen depletion.
Cite This Article
APA
Valberg S.
(1986).
Glycogen depletion patterns in the muscle of standardbred trotters after exercise of varying intensities and durations.
Equine Vet J, 18(6), 479-484.
https://doi.org/10.1111/j.2042-3306.1986.tb03697.x Publication
Researcher Affiliations
MeSH Terms
- Animals
- Female
- Glycogen / metabolism
- Horses / metabolism
- Male
- Muscles / metabolism
- Physical Exertion
Citations
This article has been cited 2 times.- Yamano S, Kawai M, Minami Y, Hiraga A, Miyata H. Differences in Muscle Fiber Recruitment Patterns between Continuous and Interval Exercises. J Equine Sci 2010;21(4):59-65.
- Muñoz A, Santisteban R, Rubio MD, Riber C, Agüera EI, Castejón FM. Locomotor response to exercise in relation to plasma lactate accumulation and heart rate in Andalusian and Anglo-Arabian horses. Vet Res Commun 1999 Oct;23(6):369-84.
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