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CompletedNCT06129513Updated Nov 13, 2023

The Effect of a Plant-blend Protein Isolate on Post-exercise Myofibrillar Protein Synthesis

An interventional study of Bilateral resistance exercise and Whey protein in Muscle Metabolism, sponsored by University of Exeter. Completed at 1 site in United Kingdom. Open to participants aged 18 Years to 40 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2023-11-13.

Sponsored by University of Exeter · Not applicable, Interventional, and Basic science

From the registry’s dates

  • Registered 1 year 6 months after the study started (first participant enrolled Feb 2022, registered Sep 2023).
Phase
Not applicable
Study type
Interventional
Enrollment
10
Allocation
Randomized
Ages
18 Years to 40 Years
Sex
All
01

Study summary

Dietary protein ingestion is required to maximise the anabolic response during the recovery from resistance exercise. Whey protein is considered the optimal dietary strategy to maximise post-exercise muscle protein synthesis, but animal-protein production and consumption is associated with growing environmental and ethical concerns. Plant-based protein sources are considered of lesser anabolic quality than isonitrogenous boluses of animal-derived protein attributed to, at least in part, deficiencies in key essential amino acid. Blending different protein sources may overcome amino acid deficiencies and potentiate the post-exercise anabolic response. In the present study the investigators assessed the post-exercise muscle protein synthetic response following the ingestion of a novel plant-based protein isolate when compared with an isonitrogenous bolus of whey protein in healthy young, resistance trained women and men.

02

Conditions studied

  • Muscle Metabolism

Keywords

  • Myofibrillar Protein Synthesis
  • Resistance Exercise
  • Plant Protein
  • Stable Isotopes
03

In context

Lead sponsor

University of Exeter is the lead sponsor of 138 studies on the registry; 25 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 40 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • BMI between 18 - 30
  • Resistance trained (>3 times per week structured resistance exercise training for at least 3 months)

Exclusion criteria

Exclusion Criteria:

  • Any metabolic impairment
  • Any cardiovascular impairment
  • Smoking
  • Lactose intolerance
  • Allergies to products containing dairy, meat or nuts
  • Prescribed intake of over the counter pharmaceuticals
05

Study design

Phase
Not applicable
Primary purpose
Basic science
Allocation
Randomized
Intervention model
Crossover assignment
Masking
Double (Participant, Investigator)
Enrollment
10 participants (actual)

Study arms

  • Active comparator
    Whey protein isolate

    Following a bout of bilateral resistance exercise, participants will ingest 32 g protein from whey protein isolate

    Behavioral: Bilateral resistance exercise · Dietary Supplement: Whey protein

  • Experimental
    Plant-blend isolate

    Following a bout of bilateral resistance exercise, participants will ingest 32 g protein from a novel plant-blend protein isolate

    Behavioral: Bilateral resistance exercise · Dietary Supplement: Plant-blend protein

Interventions

  • BehavioralBilateral resistance exercise

    A bout of bilateral resistance exercise consisting of barbell back squat, leg leg press and leg extension

  • Dietary supplementWhey protein

    Following execution of bilateral resistance exercise, participants will ingest 32 g protein from whey protein isolate

  • Dietary supplementPlant-blend protein

    Following execution of bilateral resistance exercise, participants will ingest 32 g protein from plant-blend protein isolate

06

What researchers measure

Primary outcomes

  1. Post-exercise myofibrillar protein synthesis following protein ingestion

    The fractional synthetic rate of myofibrillar proteins

    Time frame: 4 hours

Secondary outcomes

  1. Post-exercise myofibrillar protein synthesis during the early postprandial period

    The fractional synthetic rate of myofibrillar proteins

    Time frame: 2 hours

  2. Post-exercise myofibrillar protein synthesis during the late postprandial period

    The fractional synthetic rate of myofibrillar proteins

    Time frame: 2 hours

  3. Plasma amino acid response

    Post-exercise and postprandial change in plasma amino acid concentrations and availability

    Time frame: 4 hours

  4. Serum insulin response

    Post-exercise and postprandial change in serum insulin concentrations

    Time frame: 4 hours

07

Study locations

1 site
  • University of Exeter
    Exeter, United Kingdom
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Nov 13, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT06129513
Lead sponsor
University of Exeter
Responsible party
Sponsor
First posted
Nov 13, 2023
Start date
Feb 24, 2022
Primary completion
Oct 31, 2022
Completion
Oct 31, 2022
Last update
Nov 13, 2023

Oversight

FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Nov 2023. You cannot join it, but the record below documents what was studied.

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