BACKGROUND To compare the relationship of skeletal muscle mass with bone mineral content in an ethnically diverse group of 6 to 18 year old boys and girls. METHODS 175 healthy children (103 boys; 72 girls) had assessments of body mass, height, and Tanner stage. Whole body bone mineral content, non-bone lean body mass (nbLBM), skeletal muscle mass, and fat mass were assessed using dual-energy ...

It is known that the catabolism of branched-chain amino acids (BCAAs) in skeletal muscle is suppressed under normal and sedentary conditions but is promoted by exercise. BCAA catabolism in muscle tissues is regulated by the branched-chain α-keto acid (BCKA) dehydrogenase complex, which is inactivated by phosphorylation by BCKA dehydrogenase kinase (BDK). In the present study, we used muscle-spe...

Skeletal muscle has high energy requirement and alterations in metabolism are associated with pathological conditions causing muscle wasting and impaired regeneration. Congenital muscular dystrophy type 1A (MDC1A) is a severe muscle disorder caused by mutations in the LAMA2 gene. Leigh syndrome (LS) is a neurometabolic disease caused by mutations in genes related to mitochondrial function. Skel...

Abstract: The human body metabolic regulatory system is very complex, containing thousands of metabolites involved in biochemical reactions. Glucose metabolism is one of the key procedures maintaining daily energy balance. Mobility of glucose is implemented by glucose transporters with different transporting characteristics locally, which are distributed in cells of brain, liver, pancreas, kidn...

Long-duration spaceflight results in muscle atrophy and a loss of bone mineral density. In skeletal muscle tissue, acute exercise and protein (e.g., essential amino acids) stimulate anabolic pathways (e.g., muscle protein synthesis) both independently and synergistically to maintain neutral or positive net muscle protein balance. Protein intake in space is recommended to be 12%-15% of total ene...

Much of Bob Boutilier's research characterised the subcellular, organ-level and in vivo behavioural responses of frogs to environmental hypoxia. His entirely integrative approach helped to reveal the diversity of tissue-level responses to O(2) lack and to advance our understanding of the ecological relevance of hypoxia tolerance in frogs. Work from Bob's lab mainly focused on the role for skele...

The force-frequency characteristics and maximal relaxation rate of the adductor pollicis muscle were measured before and after 48 hours of intravenous loading with glucose (104.5 kJ (25 kcal)/kg/24 h) and potassium (20 mmol(mEq)/500 ml glucose) in eight undernourished patients about to undergo surgery. Both variables of skeletal muscle performance, which were depressed when compared with data f...

metabolic myopathies are genetically inherited disorders of muscle energy production that result in skeletal muscle dysfunction. they are a large group of diseases with diverse inborn errors of metabolism, in particular muscle energy production, and including disorders of glycogen (lysosomal and non-lysosomal glycogenoses), lipid (disorders of fatty acid b-oxidation, primary carnitine deficienc...

When a skeletal muscle is actively stretched, its force is substantially greater than the force obtained for a muscle contracting purely isometrically [1]. This phenomenon has been observed for more than fifty years, is an accpeted property of skeletal muscle contraction, and has been termed force enhancement [2]. When performing experiments on force enhancement in human skeletal muscles, we ob...

Skeletal muscle can maintain ATP concentration constant during the transition from rest to exercise, whereas metabolic reaction rates may increase substantially. Among the key regulatory factors of skeletal muscle energy metabolism during exercise, the dynamics of cytosolic and mitochondrial NADH and NAD+ have not been characterized. To quantify these regulatory factors, we have developed a phy...