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.
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Abbreviations
- EAA:
-
Essential amino acids
- FSR:
-
Fractional synthetic rate
- LTM:
-
Lean tissue mass
- MPS:
-
Muscle protein synthesis
- MD:
-
Microdialysis
- RE:
-
Resistance exercise
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Acknowledgments
This work has been supported by an EMBARK postgraduate scholarship from the Irish Research Council for Science, Engineering and Technology (IRCSET) awarded to WGM and Higher Education Association Research Facilities Enhancement Scheme awarded to PMJ.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the University of Limerick Research Ethics Committee (ULREC Approval 09/07) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
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McCormack, W.G., Cooke, J.P., O’Connor, W.T. et al. Dynamic measures of skeletal muscle dialysate and plasma amino acid concentration in response to exercise and nutrient ingestion in healthy adult males. Amino Acids 49, 151–159 (2017). https://doi.org/10.1007/s00726-016-2343-8
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DOI: https://doi.org/10.1007/s00726-016-2343-8