Protein Book.. надеюсь автора представлять не надо?
Транспорт
The intestine has a variety of amino acid transporters, each of which can only cany
specific amino acids (transporters often carry more than one amino acid). For example,
one transporter (called the L transporter) transports leucine along with other neutral
amino acids. Another (called the B transporter) transports threonine and the neutral
amino acids.
However, since there can be competition between amino acids for transport, it is
occasionally theorized or argued that consuming very large amounts of a single amino acid
could impair the intake of other AAs. Whether or not this actually occurs with anything
but the most extreme diet or supplement regimens is debatable. However, because of the
potential for transporter competition, certain AA supplements must often be taken by
themselves to avoid competition with other AAs carried by the same transporter.
Скорость абсорбции
In a somewhat related vein, studies looking at amino acid infusion suggest that skeletal
muscle can handle far more protein than the estimated maximum in terms of stimulating
protein synthesis. In one study, protein synthesis rates were examined at different rates of
infusion and the maximum response occurred at a rate of 150 mg/kg/h (39). This equates
to a dietary intake of 288 g/day or 2.88 g/kg for a 100 kg athlete; this would require a
protein digestion speed of roughly 12 g/h over a 24-hour span to achieve. That speed of
digestion is higher than any of the values listed in Table 2 above. From a physiological
standpoint, it seems highly unlikely that skeletal muscle would be able to respond to a
larger amount of protein than can be physiologically digested per day.
примечание насчет исследования по скорости абсорции
These measurements should be considered as the roughest estimates as the studies used
indirect measurements of protein digestion
Сообщение отредактировал AlexT: 21 Февраль 2013 - 04:19
that's what I'm talking about...