Urinary excretion of nitrogen in response to high protein diet Protein-rich diets are acidogenic due to the release of excessive non-carbonic acids (e.g., sulfuric anions), which are produced by the metabolism of protein [11, 13]. It is known AZD6738 mw that the activity of branched-chain ketoacid

dehydrogenase is increased in response to a high protein intake [23]. This enzyme facilitates the oxidation and subsequent excretion of the increased amino group. Protein nitrogens are mainly excreted as urea nitrogen via the kidneys [24]. Urinary urea excretion has been shown to increase in response to an elevated dietary protein intake in resistance exercisers, suggesting that amino acid oxidation was increased [7]. On the other hand,

the concentrations of urea in plasma and urine also increases during exercise and remains high for some time later, also in proportion to exercise intensity and duration [25]. In this study, the level of urea in plasma was within the normal range but elevated in 25% of the participants. The levels of UUN Alvespimycin molecular weight were twice as high as the recommended reference range. This result can provide an evidence to assume that elevated excretion of UUN might be due to the high rates of protein catabolism that follow high protein intake. Based on these Epigenetics inhibitor results from increased UUN and creatinine, it is ascertained that dietary protein consumed by the high-intensity resistance exerciser might be mainly

used as the substrates which is needed to release energy and/or to repair muscle mass during exercise. Urinary excretion of calcium in response to high protein diet Urinary calcium excretion is ultimately affected by dietary calcium intake. However, high protein intake could not be completely excluded from influence on urinary calcium excretion. The amount of dietary protein as well as the amount of dietary calcium affects urinary calcium excretion [26]. It has been reported that the increases in urinary calcium excretion followed by high protein intake are similar to increases Inositol monophosphatase 1 in urinary calcium excretion followed by high dietary calcium intake and independent of the level of dietary calcium [27]. A high-protein diet promotes renal calcium excretion by directly inhibiting renal tubular calcium re-absorption to maintain acid-base homeostasis [28–30]. In the previous interventional study, high protein diet significantly increased urinary calcium excretion in both human and animal model [14, 31]. In the study of Wagner et al. [14], the urinary calcium excretion of the group received a high protein diet (2.0 g/kg BW/day) was almost two times higher than that of low protein diet group (0.5 g/kg BW/day). However, although protein intakes (4.3 g/kg BW/day) in this study subjects were twice higher than the amount in Wagner et al.