Muscle lactic acid content

Meat and other animal products are even less acidic (pH = 6.6-7.2) than fresh vegetables. Immediately after slaughter, glycogen in muscles is broken down and the acidity of meat increases somewhat due to a temporary increase in lactic acid content (pH of about 5.8, see Section 2.4.5.1.5), but never reaches the acidity of very addic food (pH < 4.0). 

Olycogenolysia and Increase in Lactic Acid Content of Blood.— This is accompanied by a corresponding breakdown of muscle glycogen. The excess lactic acid is resynthesised to glycc en in the liver, and in turn serves to raise the level of blood sugar. Thus, adrenaline injection causes a mobilisation of carbohydrate in the blood, and may be described as a glucokinetic hormone. 

The method is based on precise determinations of local impedance values in tissue surrounding the tip of a needle (Kalvoy et al. 2009). Such impedance spectra allow determination of the tissue type and thereby an anatomical positioning of the needle. In some clinical applications, the separation of fat and muscle is, for instance, crucial. For clinical use, sufficient spatial resolution is obtained cause of the small sensitivity zone. A needle may be a solid needle or a cannula for simultaneous infusion or biopsy taking. The method requires a needle with an insulated shaft and a conducting tip in galvanic contact with the tissue. The method may also be applied in further characterization of tissue state, for example, oxygenation, content of substances such as lactic acid, and so on. 

He worked on the sources of energy for muscular contraction, a continuation of his first interest in muscle creatine. Phosphagen had been recently discovered. Einar Lundsgaard had just shown that muscle poisoned with iodoacetic acid was able to perform a certain amount of work without liberation of lactic acid. Using muscles with low carbohydrate content, Ochoa was able to demonstrate the muscle s ability to perform work using sources of energy different from those then known. It was an important piece of work on a topic of great interest at the time. 

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