Patrón de depleción glucogénica y respuesta metabólica muscular a la lidia en toros bravos

Se ha investigado el metabolismo muscular y el patrón de depleción glucogénica en 12 toros bravos tras la lidia para establecer su adaptación al ejercicio y el orden de intervención de las fibras musculares. Se obtuvieron biopsias musculares tras la lidia, en el músculo glúteo medio, a una profundidad absoluta de 50 mm, para realizar análisis histoquímicos y bioquímicos. El patrón de depleción glucogénica se evaluó mediante la tinción del ácido peryódico de Schiff, las concentraciones musculares de glucógeno y lactato se cuantificaron mediante fluorimetría y se midió el pH muscular. Durante la lidia, se produjo una intervención importante de las vías glucolíticas, con formación de lactato y acidosis muscular. El patrón de depleción glucogénica mostró un orden de contracción fibrilar I→IIA→IIB. El contenido muscular total de glucógeno tras la lidia dependió fundamentalmente del porcentaje de fibras IIB con contenido elevado en glucógeno. En resumen, durante la lidia existe un metabolismo muscular anaerobio intenso, a pesar de la intervención preferencial de las fibras I y IIA, resultados que podrían haberse debido al efecto del estrés psicológico y liberación de catecolaminas. El bajo pH tras la lidia indicaría una capacidad tamponadora reducida, posiblemente debido a la escasez de precursores energéticos e incapacidad de refosforilación del ADP.Muscle metabolism and glycogen depletion pattern were investigated in 12 4-year old bulls after bullfighting in order to establish their muscular adaptation to exercise and the order of recruitment of muscle fibers. Biopsies were taken immediately after bullfighting from the gluteus medium muscle at an absolute depth of 50 mm to perform histochemistry and biochemistry. Glycogen depletion pattern was evaluated by means of periodic acid Schiff’s stain and muscle glycogen and lactate concentrations were determined fluorometrically. Muscle pH was also determined. During bullfighting, a marked intervention of the glycolytic pathways occurred, with glycogen breakdown, lactate formation and muscle acidosis. Glycogen depletion pattern showed a recruitment order of I→IIA→IIB. Total muscle glycogen content after bullfighting was mainly dependent on the percentage of type IIB fibers with high content in glycogen. In summary, the results showed the high anaerobic metabolism during bullfighting, in spite of the main intervention of type I and IIA fibers, which could have been linked to psychological stress and catecholamines release. Furthermore, the low pH could be indicative of a reduced muscle buffer capacity, possible due to the lack of energy precursors and incapacity for ADP rephosphorilationFacultad de Ciencias Veterinaria

Differences in muscle enzyme profile and metabolic response to fighting in bulls from one to three years old

The metabolic response to exercise is partially linked to muscle enzyme profile, and both factors might be influenced by ageing. This research aims: 1) To analyze the differences in muscle characteristics of fighting bulls of different ages; and 2) To assess whether the muscle enzyme profile is affected by ageing in the same way it affects other bovine breeds. Muscle biopsies from gluteus medius and semitendinosus muscles were withdrawn immediately after bullfighting, at depths of 3 and 5 cm, from a total of 24 animals, belonging to three age groups: A (1-year-olds; n=6), B (2-year-olds; n=6) and C (3-year-olds; n=12). Muscle concentrations of glycogen, lactate, adenosin triphosphate and glucose-6-P were determined. In addition, activities of citrate synthase, 3-OH-acyl-dehydrogenase, glycogen phosphorylase, lactate dehydrogenase and hexokinase were measured. No significant differences were found between the two analyzed muscles and neither between depths for any of the muscle parameters. Group A showed lower muscle lactate accumulation, with positive correlations between oxidative and glycolytic enzymes, reflecting a balance between both metabolic pathways. Group B was the most oxidative, whereas group C was the most glycolytic. Therefore, muscle oxidative potential achieved its maximum at 2 years of age, whereas the glycolytic capacity increased progressively with ageing. These results are different from those showed by other bovine breeds, with a progressive reduction in oxidative potential from birth. In conclusion, age significantly influences metabolic response to fighting as well as muscle enzyme profile in bulls

Undiagnosed mood disorders and sleep disturbances in primary care patients with chronic musculoskeletal pain.

Objective. The study aims to determine the prevalence of undiagnosed comorbid mood disorders in patients suffering chronic musculoskeletal pain in a primary care setting and to identify sleep disturbances and other associated factors in these patients, and to compare the use of health services by chronic musculoskeletal pain patients with and without comorbid mood disorders. Design. Cross-sectional study. Subjects. A total of 1,006 patients with chronic musculoskeletal pain from a representative sample of primary care centers were evaluated. Outcome Measures. Pain was measured using a visual analog scale and the Primary Care Evaluation of Mental Disorders questionnaire was used to measure mood disorders. Results. We observed a high prevalence of undiagnosed mood disorders in chronic musculoskeletal pain patients (74.7%, 95% confidence interval [CI] 71.9–77.4%), with greater comorbidity in women (adjusted odds ratio [OR] = 1.91, 95% CI 1.37–2.66%) and widow(er)s (adjusted OR = 1.87, 95% CI 1.19–2.91%). Both sleep disturbances (adjusted OR = 1.60, 95% CI 1.17–2.19%) and pain intensity (adjusted OR = 1.02, 95% CI 1.01–1.02%) displayed a direct relationship with mood disorders. Moreover, we found that chronic musculoskeletal pain patients with comorbid mood disorders availed of health care services more frequently than those without (P < 0.001). Conclusions. The prevalence of undiagnosed mood disorders in patients with chronic musculoskeletal pain is very high in primary care settings. Our findings suggest that greater attention should be paid to this condition in general practice and that sleep disorders should be evaluated in greater detail to achieve accurate diagnoses and select the most appropriate treatment

Morphologic and morphometric study of the musculus obliquus dorsalis of the dog

In the present investigation, the dorsal oblique muscle of the right ocular globe was removed from six adult dogs weighing 40-50 kg and analyzed by light microscopy. Muscle samples were taken from the central portion of the muscle belly, subsequently ultrafrozen, cut and stained with m-ATPase at pH 4.6. Fibers were classified as type I or type II according to their reaction to the m-ATPase and detailed morphologic and morphometric studies were made. The muscles showed two clearly distinct layers, a central layer and a peripheral layer, mainly composed of type II fibers. The fibers in the central layer were larger in size than those in the peripheral layer. The peculiar stratigraphy of the dorsal oblique muscle should be taken into account when performing analyses of this muscle and investigating the significance of the fiber types it contains.En el presente trabajo se han extraído, de los globos oculares derechos, de seis perros adultos de 40-50 kilogramos de peso, los músculos oblicuos dorsales y analizados con microscopia de luz. Las muestras musculares para su análisis se tomaron de la porción central del vientre muscular y fueron ultracongeladas, cortadas y teñidas por la técnica de m-ATPasa a pH 4,6. Las fibras se clasificaron en tipo I y tipo II en virtud a su reacción frente a la m-ATPasa, realizándose un detallado estudio morfológico y morfométrico. Los músculos presentaron dos estratos netamente diferenciados, uno central y otro periférico, compuestos mayoritariamente por fibras tipo II. Las fibras del estrato central presentaron un mayor tamaño que las correspondientes del estrato periférico. La peculiar estratigrafía del músculo oblicuo dorsal debería tenerse en consideración al analizar este músculo e investigar el significado de los tipos fibrilares que contien

Patrón de depleción glucogénica y respuesta metabólica muscular a la lidia en toros bravos

Se ha investigado el metabolismo muscular y el patrón de depleción glucogénica en 12 toros bravos tras la lidia para establecer su adaptación al ejercicio y el orden de intervención de las fibras musculares. Se obtuvieron biopsias musculares tras la lidia, en el músculo glúteo medio, a una profundidad absoluta de 50 mm, para realizar análisis histoquímicos y bioquímicos. El patrón de depleción glucogénica se evaluó mediante la tinción del ácido peryódico de Schiff, las concentraciones musculares de glucógeno y lactato se cuantificaron mediante fluorimetría y se midió el pH muscular. Durante la lidia, se produjo una intervención importante de las vías glucolíticas, con formación de lactato y acidosis muscular. El patrón de depleción glucogénica mostró un orden de contracción fibrilar I→IIA→IIB. El contenido muscular total de glucógeno tras la lidia dependió fundamentalmente del porcentaje de fibras IIB con contenido elevado en glucógeno. En resumen, durante la lidia existe un metabolismo muscular anaerobio intenso, a pesar de la intervención preferencial de las fibras I y IIA, resultados que podrían haberse debido al efecto del estrés psicológico y liberación de catecolaminas. El bajo pH tras la lidia indicaría una capacidad tamponadora reducida, posiblemente debido a la escasez de precursores energéticos e incapacidad de refosforilación del ADP.Muscle metabolism and glycogen depletion pattern were investigated in 12 4-year old bulls after bullfighting in order to establish their muscular adaptation to exercise and the order of recruitment of muscle fibers. Biopsies were taken immediately after bullfighting from the gluteus medium muscle at an absolute depth of 50 mm to perform histochemistry and biochemistry. Glycogen depletion pattern was evaluated by means of periodic acid Schiff’s stain and muscle glycogen and lactate concentrations were determined fluorometrically. Muscle pH was also determined. During bullfighting, a marked intervention of the glycolytic pathways occurred, with glycogen breakdown, lactate formation and muscle acidosis. Glycogen depletion pattern showed a recruitment order of I→IIA→IIB. Total muscle glycogen content after bullfighting was mainly dependent on the percentage of type IIB fibers with high content in glycogen. In summary, the results showed the high anaerobic metabolism during bullfighting, in spite of the main intervention of type I and IIA fibers, which could have been linked to psychological stress and catecholamines release. Furthermore, the low pH could be indicative of a reduced muscle buffer capacity, possible due to the lack of energy precursors and incapacity for ADP rephosphorilationFacultad de Ciencias Veterinaria