![]() ![]() On the other hand, smaller tissues with disorganized collagen fibrils have been associated with higher injury risk, such as the development of tendinopathies ( 1). Larger tissues with more densely packed collagen fibrils have a greater capacity to withstand force, and thereby exert greater injury protection ( 4). Literature suggests that ligaments and tendons are similar to muscle in being dynamic structures that respond to mechanical loading with tissue hypertrophy ( 1– 3). This information may support further investigations, and identification of key AAs that may support exercise in the synthesis of collagen. Although there were several differences in the bioavailability of hydrolysed compared to non-hydrolysed proteins, this only reached statistical significance within the dairy proteins, but not for collagen proteins.Ĭonclusions: The intake of collagen proteins result in higher plasma peaks of glycine, whilst the intake of dairy proteins result in higher plasma peaks of leucine. Results: In general, protein intake was associated with a similar increase in total and collagen specific AAs, except for collagen proteins being a superior source of glycine (683 ± 166 μmol/L) compared to 260 ± 65 μmol/L for dairy proteins ( P < 0.0001), whilst dairy proteins were a superior source of leucine (267 ± 77 μmol/L) compared to 189 ± μmol/L for collagen proteins ( P < 0.04). Total AA, essential AA and collagen specific AAs were analyzed for maximum concentration, timing of peak, and area under the curve. Blood samples were drawn every 20 min for a total of 180 min, for analysis of plasma AA concentrations. Methods: A 20 g serve of various dairy and collagen proteins, and a 300 mL serve of bone broth were consumed by healthy, recreationally active males after an overnight fast. Objectives: The aim of the current study was to characterize blood AA concentrations in response to consumption of collagen and dairy protein sources specifically, maximum concentrations, the timing of maximum concentration, and total (area under the curve) exposure above baseline. However, little is currently known about the bioavailability of these AAs in blood after the consumption of various collagen and diary protein sources: such information is needed to develop potentially useful dietary and supplement intake strategies. Introduction: Recent evidence suggests that the consumption of essential amino acids (AA) and/or those abundantly present in collagen may have the capacity to influence the synthesis of new collagen in ligaments and tendons, when tissue perfusion is optimized (e.g., during exercise). 3High Performance Unit, Swimming Australia, Brisbane, QLD, Australia.2Australian Institute of Sport, Australian Sports Commission, Canberra, ACT, Australia.1Mary Mackillop Institute for Health Research, Australian Catholic University, Melbourne, VIC, Australia. ![]()
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