Table 1.

Plasma concentration of individual branched-chain amino acids

Amino AcidConditionRestExerciseRecovery, min
BeforeDuringAfter15306090120
IsoleucinePlacebo100±398±398±392±590±585±479±475±380±4
BCAA110±2121±5155±8154±10141±9176±19209±9184±10169±8
LeucinePlacebo187±5187±6185±7176±7175±10164±6153±6148±5153±6
BCAA200±9220±14278±15277±13256±9322±28374±10340±16320±12
ValinePlacebo326±6329±9328±11313±10328±19308±10294±11283±8289±8
BCAA342±21352±18416±21422±17400±16456±27522±17552±48473±19
  • Values are means ± SE for 6 subjects in μmol/l. Plasma concentration of individual branched-chain amino acids (BCAA: isoleucine, leucine, and valine), as evaluated by comparison of corresponding areas under time-concentration curves, is significantly increased in the BCAA trial during and after exercise (P < 0.05 vs. placebo).