An interventional study of CONTROL and Whey Protein Concentrate in Resistance Training and Muscle Damage, sponsored by University of Limerick. Completed at 1 site in Ireland. Open to male participants aged 18 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-01-31.
Sponsored by University of Limerick · Not applicable, Interventional, and Basic science
The focus is performance nutrition. Resistance exercise can induce low level muscle damage in conjunction with impaired contractile function. Milk-derived proteins contain, or induce, bioactive properties that assist muscle recovery and restore/improve muscle function. The aim of the research is the recovery of muscle function following resistance exercise.
In this study, the investigators propose to undertake a comparison of the ingestion of two milk-derived protein-based recovery drinks on muscle function after resistance exercise compares to an isonitrogenous, non-essential amino acid control.
Study Design: A block randomised design of 3 groups of resistance-exercise trained (RET) men
Participants: 24 young, healthy, resistance exercise trained, males aged 18 - 35 years.
Recovery drinks; CONTROL - an isonitrogenous, non-essential amino acid solution; PROTEIN - a milk-based whey protein concentrate (WPC), WPC-80; HYDROLYSATE - a hydrolysed derivative of WPC-80.
Day 1, Pre-screening consisting of:
Day 2 - 8: Participants will be "free-living" during this time. Participants will record dietary intake under the guidance of a qualified dietitian and sports nutritionist.
Day 9 and 10: Participants will complete two familiarisation sessions to the resistance exercise and muscle function testing procedures.
A single blood sample (5ml) will be drawn following o/n fast on each day. On day 2 participants will drink a metered dose of deuterated water (around 200ml) containing deuterium. A saliva sample will be taken before and after consuming this bolus.
Day 11-17. During this experimental phase diet is prescribed and provided. The diet is based on habitual food intake standardized to body mass.
Day 11: O/n fasted blood, saliva and 1st micro-biopsy of muscle obtained; Muscle function measured prior to and upon completion of a prescribed bout of resistance exercise training (RET); The recovery drink (0.33 g protein/kg body mass) is ingested; 3 hours following completion of RET a 2nd micro-biopsy of muscle is obtained.
Day 12: O/n fasted blood and saliva is obtained Muscle function measured and recovery drink (0.33 g protein/kg body mass) consumed.
Day 13: O/n fasted blood and saliva is obtained Muscle function measured followed by the 2nd RET bout and recovery drink (0.33 g protein/kg body mass) consumed.
Day 14: O/n fasted blood and saliva is obtained Muscle function measured and recovery drink (0.33 g protein/kg body mass) consumed.
Day 15: O/n fasted blood and saliva is obtained Muscle function measured followed by the 3rd RET bout and recovery drink (0.33 g protein/kg body mass) consumed.
Day 16 O/n fasted blood, saliva and 3rd micro-biopsy of muscle obtained Muscle function measured and recovery drink (0.33 g protein/kg body mass) consumed.
Day 17: O/n fasted blood and saliva is obtained Muscle function measured
Exclusion Criteria:
Intervention: Dietary Supplement: Non-essential amino acids A group of subjects ingesting a liquid beverage (per kilogram body mass: 0.33g non-essential amino acids dissolved in water ) prior to completion of a prescribed resistance exercise training (RET) session. Muscle Contractile Function to be conducted prior to and following the RET session by laboratory-based ergometry. Muscle Protein Synthesis induced by RET to be measured by deuterium incorporation in to skeletal muscle sampled by microbiopsy.
Dietary Supplement: CONTROL
Intervention: Dietary Supplement: Whey Protein Concentrate A group of subjects ingesting a liquid beverage (per kilogram body mass: 0.33g of Whey Protein Concentrate dissolved in water ) prior to completion of a prescribed resistance exercise training (RET) session. Muscle Contractile Function to be conducted prior to and following the RET session by laboratory-based ergometry. Muscle Protein Synthesis induced by RET to be measured by deuterium incorporation in to skeletal muscle sampled by microbiopsy.
Dietary Supplement: Whey Protein Concentrate
Intervention: Dietary Supplement: Whey Protein Hydrolysate A group of subjects ingesting a liquid beverage (per kilogram body mass: 0.33g of Whey Protein Hydrolysate dissolved in water ) prior to completion of a prescribed resistance exercise training (RET) session. Muscle Contractile Function to be conducted prior to and following the RET session by laboratory-based ergometry. Muscle Protein Synthesis induced by RET to be measured by deuterium incorporation in to skeletal muscle sampled by microbiopsy.
Dietary Supplement: Whey Protein Hydrolysate
Food grade mixture of non-essential amino acids in powdered form, flavoured and instantised to be dissolved in water. Supplied by Carbery Food Ingredients Limited, Ballineen, Ireland. Product Reference Number 10955
Whey protein concentrate in powdered form, flavoured and instantised to be dissolved in water. Supplied by Carbery Food Ingredients Limited, Ballineen, Ireland. Trade name of product is Carbelac80 Instant Product Reference Number 10431
Also known as: Carbelac80 Instant
Whey protein concentrate hydrolysate (degree of hydrolysate 27%) in powdered form, flavoured and instantised to be dissolved in water. Supplied by Carbery Food Ingredients Limited, Ballineen, Ireland. Product Reference Number 10468
Change in Muscle Contractile Function
Maximal Voluntary Contract (MVC) of Knee Extensor Muscle measured by laboratory-based ergometry
Time frame: Day 9, 10, 11, 12, 13, 14, 15, 16 and 17
Change in Muscle Protein Synthesis
The fractional rate of muscle protein synthesis (MPS) measured by deuterium incorporation into skeletal muscle sampled by microbiopsy
Time frame: Day 11 and 16
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University of Limerick