Protein requirements in individuals who participate in endurance-based exercise training have been suggested to be greater than the current recommended dietary allowance (RDA). Our recent study using the minimally invasive indicator amino acid oxidation (IAAO) technique have suggested that protein requirements in young men are at least 30% higher than the recommended protein intake. The present study will investigate the impact of protein sufficiency on protein metabolism and performance during intensified training periods as a means to further our understanding of the nutritional requirements for the endurance athlete.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Enrollment
12
test drink which contains low amount of amino acids (0.14 g/kg/day)
test drink which contains moderate amount of amino acids (0.40 g/kg/day)
test drink which contains high amount of amino acids (1.03 g/kg/day)
the diet containing 0.8 g protein /kg/day
Goldring Centre For High Performance Sport
Toronto, Ontario, Canada
Change in 24h whole body protein balance
Protein balance (mg/kg/d; protein synthesis - protein breakdown) will be measured using \[15N\]Glycine method on day 1 and day 4 to determine the change over the intensified training period to compare between protein levels
Time frame: Difference between day 1 and day 4 whole body protein balance
Change from baseline physical performance (5 km time trial) 5days after the beginning of training
Before and after 4 days of intensified training period, Duration (seconds) for completing 5-km running on treadmill will be measured.
Time frame: 5days after the beginning of training
change from baseline Physical performance (muscle strength) 5days after the beginning of training
Maximal strength will be assessed by a maximal isometric voluntary contraction (MVC), which will be tested for the knee-extensors using a custom-made knee-extension apparatus after 4 days intensified training.
Time frame: 5days after the beginning of training
change from baseline Physical Performance (muscle power) 5days after the beginning of training
Peak lower body power will be measured by force platform after 4days-intensified training.
Time frame: 5days after the beginning of training
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