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Skeletal muscle protein turnover in ...

Pikosky, Matthew A.

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Skeletal muscle protein turnover in runners and endurance-trained adults consuming the RDA for protein.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Skeletal muscle protein turnover in runners and endurance-trained adults consuming the RDA for protein./
Author:	Pikosky, Matthew A.
Description:	166 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3752.
Contained By:	Dissertation Abstracts International64-08B.
Subject:	Health Sciences, Nutrition. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3101708

Skeletal muscle protein turnover in runners and endurance-trained adults consuming the RDA for protein.
Pikosky, Matthew A.

Skeletal muscle protein turnover in runners and endurance-trained adults consuming the RDA for protein. - 166 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3752.

Thesis (Ph.D.)--The University of Connecticut, 2003.

Dietary protein needs of physically active individuals are a highly debated topic. However, the relationship between endurance exercise, protein intake, and skeletal muscle protein metabolism has received little attention in the scientific literature. This investigation consists of two studies which provide insight to this area. In the first investigation, five male runners participated in a randomized, crossover design diet intervention, where they consumed either a low (0.8 g/kg; LP), moderate (1.8 g/kg; MP), or high (3.6 g/kg; HP) protein diet for 4 weeks. Diets were isocaloric, with carbohydrate, fat and protein approximating 60%, 30%, 10%; 55%, 30%, 15; and 40%, 30%, 30% for LP, MP, and HP respectively. Mixed muscle protein fractional synthetic and breakdown rates (FSR/FBR) were assessed at week 4 following a 75 min run at 70% VO2peak using primed continuous infusions of [<super>2</super>H5]phenylalanine (FSR) and [<super>15</super>N]phenylalanine (FBR). Postexercise FSR was significantly higher for LP and MP compared to HP. Preliminary findings demonstrated a trend for postexercise FBR to decrease with increasing protein intake, thereby resulting in a less negative NET balance (FSR-FBR). This is the first study to demonstrate that dietary protein intake can impact protein utilization postexercise in the fasted state.Subjects--Topical Terms:

1017801
Health Sciences, Nutrition.

Skeletal muscle protein turnover in runners and endurance-trained adults consuming the RDA for protein.
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035 $a (UnM)AAI3101708
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100 1 $a Pikosky, Matthew A. $3 1945340
245 1 0 $a Skeletal muscle protein turnover in runners and endurance-trained adults consuming the RDA for protein.
300 $a 166 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3752.
500 $a Adviser: Nancy Rodriguez.
502 $a Thesis (Ph.D.)--The University of Connecticut, 2003.
520 $a Dietary protein needs of physically active individuals are a highly debated topic. However, the relationship between endurance exercise, protein intake, and skeletal muscle protein metabolism has received little attention in the scientific literature. This investigation consists of two studies which provide insight to this area. In the first investigation, five male runners participated in a randomized, crossover design diet intervention, where they consumed either a low (0.8 g/kg; LP), moderate (1.8 g/kg; MP), or high (3.6 g/kg; HP) protein diet for 4 weeks. Diets were isocaloric, with carbohydrate, fat and protein approximating 60%, 30%, 10%; 55%, 30%, 15; and 40%, 30%, 30% for LP, MP, and HP respectively. Mixed muscle protein fractional synthetic and breakdown rates (FSR/FBR) were assessed at week 4 following a 75 min run at 70% VO2peak using primed continuous infusions of [<super>2</super>H5]phenylalanine (FSR) and [<super>15</super>N]phenylalanine (FBR). Postexercise FSR was significantly higher for LP and MP compared to HP. Preliminary findings demonstrated a trend for postexercise FBR to decrease with increasing protein intake, thereby resulting in a less negative NET balance (FSR-FBR). This is the first study to demonstrate that dietary protein intake can impact protein utilization postexercise in the fasted state.
520 $a In the second study, the impact of 6-weeks of endurance training on FSR and FBR was examined in 12 untrained individuals fed eucaloric diets containing 0.8 g protein /kg/d. Subjects were divided into an egg and no egg group to examine the impact of protein source on protein utilization. Resting FSR and FBR significantly increased and NET balance became more negative (p < 0.05) following 4 weeks of training (p < 0.05). After a 45min run at 65% VO 2max, FBR significantly increased compared to rest (p < 0.05). Consumption of the egg based diet did not significantly impact protein metabolism with the exception of the egg group demonstrating a significantly higher FBR postexercise compared to the no egg group (p < 0.05). These findings are the first to demonstrate that routine endurance training significantly impacts skeletal muscle protein metabolism at rest and following a single exercise session. The impact of dietary protein source on these parameters was less clear and warrants further investigation.
590 $a School code: 0056.
650 4 $a Health Sciences, Nutrition. $3 1017801
650 4 $a Health Sciences, Recreation. $3 1018003
650 4 $a Biology, Animal Physiology. $3 1017835
690 $a 0570
690 $a 0575
690 $a 0433
710 2 0 $a The University of Connecticut. $3 1249323
773 0 $t Dissertation Abstracts International $g 64-08B.
790 1 0 $a Rodriguez, Nancy, $e advisor
790 $a 0056
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3101708