title: Dynamic measures of skeletal muscle dialysate and plasma amino acid concentration in response to exercise and nutrient ingestion in healthy adult males.
abstract: Nutrient stimulation of muscle protein synthesis (MPS) is regulated by the change in extracellular essential amino acid (EAA) concentration. In vivo microdialysis (MD) is a minimally invasive sampling technique, capable of sampling solute in the interstitial space of a target tissue. In a contralateral limb design (REST vs. EX), this study utilised in vivo MD to examine the change in skeletal muscle dialysate amino acid concentration following ingestion of whey protein isolate (WPI) and flavoured water (CON). Four male subjects undertook unilateral, concentric lower limb knee extensor resistance exercise (RE) on two occasions. After RE, an MD catheter (CMA 63) was inserted into m. vastus lateralis of the exercise and resting leg and sampled serially over 7 h. Following a 2.5 h equilibration period subjects consumed either 0.55 g/kg WPI or CON. Peak plasma EAA (2656 ± 152 µM) preceded the peak in dialysate EAA (2345 ± 164 µM) by 30 min in response to WPI ingestion; however, the post-prandial elevation in dialysate EAA extended beyond that of the plasma. This resulted in no difference in the dialysate EAA area under the curve (ΔAUC270) relative to plasma in response to WPI ingestion [220 ± 29 vs. 206 ± 7.9 mmol min/L (p = 0.700)]. A bout of unilateral lower limb RE had no effect of the subsequent dialysate amino acid concentration in response to either WPI or CON ingestion. These data represent a novel report describing the time course and magnitude of change in skeletal muscle dialysate concentration of key nutrient regulators of MPS sampled by in vivo MD, in response to nutrient ingestion with and without RE.
authors.affiliation: Department of Physical Education and Sport Sciences, University of Limerick, Limerick, Ireland. will.mccormack@ul.ie.
authors.forename: William G
authors.initials: WG
authors.lastname: McCormack
authors.affiliation: Graduate Entry Medical School (GEMS), University of Limerick, Limerick, Ireland.
authors.forename: John P
authors.initials: JP
authors.lastname: Cooke
authors.affiliation: Graduate Entry Medical School (GEMS), University of Limerick, Limerick, Ireland.
authors.forename: William T
authors.initials: WT
authors.lastname: O'Connor
authors.affiliation: Department of Physical Education and Sport Sciences, University of Limerick, Limerick, Ireland.|Centre for Interventions in Infection, Inflammation and Immunity (4i), University of Limerick, Limerick, Ireland.
authors.forename: Philip M
authors.initials: PM
authors.lastname: Jakeman
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000601:Amino Acids, Essential / Q000097:blood / Q000493:pharmacokinetics*; D019540:Area Under Curve; D015992:Body Mass Index; D015314:Dialysis Solutions / Q000737:chemistry; D006801:Humans; D008297:Male; D017551:Microdialysis; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism; D055070:Resistance Training; D000067816:Whey Proteins / Q000008:administration & dosage / Q000378:metabolism*
chemical_list: D000601:Amino Acids, Essential; D015314:Dialysis Solutions; D000067816:Whey Proteins
keywords: Microdialysis; Resistance exercise; Skeletal muscle; Whey protein