ArticleActa veterinaria Scandinavica2014
Muscle fibre type distribution of the thoracolumbar and hindlimb regions of horses: relating fibre type and functional role.
Article in Acta veterinaria Scandinavica, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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10 citing papers in PubMed, 29 citations in OpenAlex.
- Histological properties of the distal sesamoidean impar ligament in racing Thoroughbreds and Quarter horses.Canadian journal of veterinary research = Revue canadienne de recherche veterinaire · 2026Article
- Electromyography of the Multifidus Muscle in Horses Trotting During Therapeutic Exercises.Frontiers in veterinary science · 2022Article
- Muscle Fibre Architecture of Thoracic and Lumbar Longissimus Dorsi Muscle in the Horse.Animals : an open access journal from MDPI · 2021Article
- Article
- Clinical assessment and grading of back pain in horses.Journal of veterinary science · 2020Article
- Identification and Functional Annotation of Genes Related to Horses' Performance: From GWAS to Post-GWAS.Animals : an open access journal from MDPI · 2020Article
- The Effect of Kinesiotape on Flexion-Extension of the Thoracolumbar Back in Horses at Trot.Animals : an open access journal from MDPI · 2020Article
- Parameters and functional analysis of the deep epaxial muscles in the thoracic, lumbar and sacral regions of the equine spine.Journal of anatomy · 2018Article
- The effect of rider weight and additional weight in Icelandic horses in tölt: part I. Physiological responses.Animal : an international journal of animal bioscience · 2017Article
- Structural and functional characteristics of the thoracolumbar multifidus muscle in horses.Journal of anatomy · 2017Article
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Authors and funding
5 authors at 3 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundAlthough the majority of equine muscles have a mixed fibre type distribution indicative of diverse functional roles, the predominance of a fibre type can indicate the primary function of a muscle. The deep epaxial musculature has an important role in core spinal stability in humans, reflected as a predominantly muscle fibre type (MFT) I or postural fibre type. The fibre type of the deep epaxial musculature has not been determined in horses. The objective of the study was to determine the MFT distribution in selected muscles of thoracolumbar and hindlimb region of horses. This included deep epaxial and hypaxial muscles that were hypothesised to have a postural stabilising role. A second objective was to examine differences in MFT distribution between horses bred for endurance (Arabian) and sprinting (Quarter horse). Muscle biopsy samples were obtained from selected thoracolumbar and hind limb muscles of 5 Quarter horses, 4 Arabians, and 2 Thoroughbreds. The myosin heavy chain distribution was determined by gel electrophoresis. Mann-Whitney rank test was used to compare the proportional MFT and differences between breeds.
resultsMm. sacrocaudalis dorsalis medialis and diaphragm had the highest proportion of MFT-I. The remaining deep epaxial muscles and the hypaxial muscle m. psoas minor had approximately equal MFT I and II proportions. Mm. psoas major, iliocostalis, longissimus dorsi and the hind limb muscles contained mostly MFT-IIX. The fibre type distribution was similar between Arabians and Quarter horses, although Quarter horses had more MFT-IIX fibres in psoas major (P = 0.02) while Arabians had more MFT-I fibres in m. longissimus dorsi (P = 0.03).
conclusionsThe fibre type distribution of the deep epaxial muscles, mm psoas minor and diaphragm varied from approximately equal MFT-I and II proportions to predominantly MFT-I suggesting a postural stabilising role possibly important in core spinal stability. In contrast the fibre type proportions of mm psoas major, iliocostalis, longissimus dorsi and the hind limb muscles were mainly MFT-II suggesting a locomotory role. Knowledge of fibre type distribution in such a clinically important area can direct diagnosis, prevention and treatment of muscular or neuromotor dysfunction.
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