Enter your Email address:
Wolters Kluwer Health may email you for journal alerts and information, but is committed
to maintaining your privacy and will not share your personal information without
You currently have no recent searches
Gaine, P C.1; Martin, W F.1; Pikosky, M A.1; Bolster, D R.1; Maresh, C M. FACSM1; Tipton, K D.1; Wolfe, R R.1; Rodriguez, N R.1
1Departments of Kinesiology and Nutritional Sciences, University of Connecticut, Storrs, CT, and Departments of Surgery and Anesthesiology, University of Texas Medical Branch, Galveston, TX
(Sponsor: Carl M. Maresh, FACSM)
An increase in mixed muscle protein fractional synthetic rate (FSR) following a resistance training bout is well documented. However, the impact of endurance exercise on mixed muscle FSR have not been well characterized in trained athletes.
To evaluate FSR responses to a prolonged submaximal intensity run in competitive runners.
A primed, continuous infusion of [2H5]-Phenylalanine was used to measure FSR in the vastus lateralis muscle of male endurance runners (n=3, 23 yrs, 71 kg, 180 cm, 9% body fat, VO2peak 72 ± 4 ml/kg/min) on two separate occasions, at rest and following a 75 minute endurance run at 70% VO2peak. Protein intakes for subjects were determined from 3 day dietary food records (rest) and controlled feeding (postexercise) using Nutritionist Pro software. Mean FSR values at rest and postexercise were analyzed using a paired Student's t-test to evaluate rest vs. postexercise FSR responses.
Dietary protein intakes were similar between FSR assessments for each athlete and ranged from 0.9 to 1.8 g/kg/body weight. While there were no statistically significant differences between subjects for each assessment, there was an 80% increase in FSR from rest to postexercise (0.06 ± 0.01 vs. 0.11 ± 0.02 %/hr, p = 0.009).
The increase in FSR in competitive distance runners following an endurance run, was similar to, and in some cases greater than, increases previously noted after a resistance exercise bout in strength trained individuals. Future studies specifically designed to contrast effects of mode of exercise on skeletal muscle protein metabolism are warranted. Supported in part by the NCBA and the UCRF.
©2003The American College of Sports Medicine
Colleague's E-mail is Invalid
Your Name: (optional)
Separate multiple e-mails with a (;).
Thought you might appreciate this item(s) I saw at Medicine & Science in Sports & Exercise.
Send a copy to your email
Your message has been successfully sent to your colleague.
Some error has occurred while processing your request. Please try after some time.
An Existing Folder
A New Folder
The item(s) has been successfully added to "".
Login with your LWW Journals username and password.
Username or Email:
Enter and submit the email address you registered with. An email with instructions to reset your password will be sent to that address.
Link to reset your password has been sent to specified email address.
What does "Remember me" mean?
By checking this box, you'll stay logged in until you logout. You'll get easier access to your articles, collections,
media, and all your other content, even if you close your browser or shut down your
To protect your most sensitive data and activities (like changing your password),
we'll ask you to re-enter your password when you access these services.
What if I'm on a computer that I share with others?
If you're using a public computer or you share this computer with others, we recommend
that you uncheck the "Remember me" box.
Save my selection