Protein dose and quantity amongst elite rugby players

Kristen MacKenzie, Neil King, Nuala Byrne, Gary Slater

Research output: Contribution to conferenceAbstractResearchpeer-review

Abstract

Introduction: Optimising protein intake to promote gains in skeletal muscle mass (SMM) isconsidered important by many athletes (Phillips et al, 2007). Research has suggested thatmuscle protein synthesis may be optimised by a single 20g protein dose (approximately~0.3g·kg-1body mass) with no further stimulation at higher doses (Moore et al, 2007). Oneacute study reported enhanced muscle protein synthesis when protein was consumed afterresistance training as several small 20g doses, rather than larger, less frequent doses (Aretaet al, 2012). This study aimed to examine self-reported protein distribution and dose in elitedevelopment rugby union athletes. A secondary aim was to assess the relationship betweenprotein distribution and changes in fat-free mass (FFM) over a rugby pre-season.Methods: 25 athletes (20.5±2.3yrs; 100.2±13.3kg) completed a 7d food diary. Food portionguides and Foodworks v.6.0.2562 (2009) were used to quantify food intake. Proteindistribution scores were calculated as the number of times an eating occasion (>15 minutesapart) achieved a target amount of protein (20g or individually calculated target based on0.3g·kg-1i.e. 30.0±4.0g) averaged per day. FFM was measured by dual energy x-rayabsorptiometry.Results: The mean number of eating occasions was 5.6±1.0. The protein distribution scoresfor 20g and calculated protein target were 3.8±1.0 (68±18% of eating occasions) and 2.8±1.1(50±20% of eating occasions) respectively. 2.0±0.9 (36±16%) of all eating occasionsexceeded the calculated protein target by more than 50%. The effect of 20g proteindistribution score on changes in FFM was not significant (p=0.15); regression analysis wasimpacted by statistical power and multicollinearity.Discussion: This study provides evidence that rugby players select a meal plan that includeslarger, less frequent doses of protein. However, it is unclear whether protein distributionimpacts on chronic changes in FFM. Chronic studies monitoring associations between dietaryintake and protein distribution on changes in FFM or SMM pose several methodological andanalytical challenges. Acute studies may assist by clarifying the optimal protein distributionand protein doses for changes in indicators of SMM synthesis. Further research is warrantedto assess the impact of protein dose and distribution, with consideration of other dietary intakevariables, on chronic changes in body composition amongst rugby union athletes.
Original languageEnglish
Publication statusPublished - 30 Jun 2013
Externally publishedYes
EventEuropean Congress of Sports Science 2013 - Barcelona, Spain
Duration: 26 Jun 201328 Jun 2013
Conference number: 18
http://www.sport-science.org/index.php?option=com_content&view=article&id=432&Itemid=124 (2013 Barcelona, ESP )

Conference

ConferenceEuropean Congress of Sports Science 2013
CountrySpain
CityBarcelona
Period26/06/1328/06/13
Internet address

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Football
Proteins
Eating
Athletes
Fats
Skeletal Muscle
Diet Records
Muscle Proteins
Body Composition
Research

Cite this

MacKenzie, K., King, N., Byrne, N., & Slater, G. (2013). Protein dose and quantity amongst elite rugby players. Abstract from European Congress of Sports Science 2013, Barcelona, Spain.
MacKenzie, Kristen ; King, Neil ; Byrne, Nuala ; Slater, Gary. / Protein dose and quantity amongst elite rugby players. Abstract from European Congress of Sports Science 2013, Barcelona, Spain.
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abstract = "Introduction: Optimising protein intake to promote gains in skeletal muscle mass (SMM) isconsidered important by many athletes (Phillips et al, 2007). Research has suggested thatmuscle protein synthesis may be optimised by a single 20g protein dose (approximately~0.3g·kg-1body mass) with no further stimulation at higher doses (Moore et al, 2007). Oneacute study reported enhanced muscle protein synthesis when protein was consumed afterresistance training as several small 20g doses, rather than larger, less frequent doses (Aretaet al, 2012). This study aimed to examine self-reported protein distribution and dose in elitedevelopment rugby union athletes. A secondary aim was to assess the relationship betweenprotein distribution and changes in fat-free mass (FFM) over a rugby pre-season.Methods: 25 athletes (20.5±2.3yrs; 100.2±13.3kg) completed a 7d food diary. Food portionguides and Foodworks v.6.0.2562 (2009) were used to quantify food intake. Proteindistribution scores were calculated as the number of times an eating occasion (>15 minutesapart) achieved a target amount of protein (20g or individually calculated target based on0.3g·kg-1i.e. 30.0±4.0g) averaged per day. FFM was measured by dual energy x-rayabsorptiometry.Results: The mean number of eating occasions was 5.6±1.0. The protein distribution scoresfor 20g and calculated protein target were 3.8±1.0 (68±18{\%} of eating occasions) and 2.8±1.1(50±20{\%} of eating occasions) respectively. 2.0±0.9 (36±16{\%}) of all eating occasionsexceeded the calculated protein target by more than 50{\%}. The effect of 20g proteindistribution score on changes in FFM was not significant (p=0.15); regression analysis wasimpacted by statistical power and multicollinearity.Discussion: This study provides evidence that rugby players select a meal plan that includeslarger, less frequent doses of protein. However, it is unclear whether protein distributionimpacts on chronic changes in FFM. Chronic studies monitoring associations between dietaryintake and protein distribution on changes in FFM or SMM pose several methodological andanalytical challenges. Acute studies may assist by clarifying the optimal protein distributionand protein doses for changes in indicators of SMM synthesis. Further research is warrantedto assess the impact of protein dose and distribution, with consideration of other dietary intakevariables, on chronic changes in body composition amongst rugby union athletes.",
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MacKenzie, K, King, N, Byrne, N & Slater, G 2013, 'Protein dose and quantity amongst elite rugby players' European Congress of Sports Science 2013, Barcelona, Spain, 26/06/13 - 28/06/13, .

Protein dose and quantity amongst elite rugby players. / MacKenzie, Kristen; King, Neil; Byrne, Nuala; Slater, Gary.

2013. Abstract from European Congress of Sports Science 2013, Barcelona, Spain.

Research output: Contribution to conferenceAbstractResearchpeer-review

TY - CONF

T1 - Protein dose and quantity amongst elite rugby players

AU - MacKenzie, Kristen

AU - King, Neil

AU - Byrne, Nuala

AU - Slater, Gary

PY - 2013/6/30

Y1 - 2013/6/30

N2 - Introduction: Optimising protein intake to promote gains in skeletal muscle mass (SMM) isconsidered important by many athletes (Phillips et al, 2007). Research has suggested thatmuscle protein synthesis may be optimised by a single 20g protein dose (approximately~0.3g·kg-1body mass) with no further stimulation at higher doses (Moore et al, 2007). Oneacute study reported enhanced muscle protein synthesis when protein was consumed afterresistance training as several small 20g doses, rather than larger, less frequent doses (Aretaet al, 2012). This study aimed to examine self-reported protein distribution and dose in elitedevelopment rugby union athletes. A secondary aim was to assess the relationship betweenprotein distribution and changes in fat-free mass (FFM) over a rugby pre-season.Methods: 25 athletes (20.5±2.3yrs; 100.2±13.3kg) completed a 7d food diary. Food portionguides and Foodworks v.6.0.2562 (2009) were used to quantify food intake. Proteindistribution scores were calculated as the number of times an eating occasion (>15 minutesapart) achieved a target amount of protein (20g or individually calculated target based on0.3g·kg-1i.e. 30.0±4.0g) averaged per day. FFM was measured by dual energy x-rayabsorptiometry.Results: The mean number of eating occasions was 5.6±1.0. The protein distribution scoresfor 20g and calculated protein target were 3.8±1.0 (68±18% of eating occasions) and 2.8±1.1(50±20% of eating occasions) respectively. 2.0±0.9 (36±16%) of all eating occasionsexceeded the calculated protein target by more than 50%. The effect of 20g proteindistribution score on changes in FFM was not significant (p=0.15); regression analysis wasimpacted by statistical power and multicollinearity.Discussion: This study provides evidence that rugby players select a meal plan that includeslarger, less frequent doses of protein. However, it is unclear whether protein distributionimpacts on chronic changes in FFM. Chronic studies monitoring associations between dietaryintake and protein distribution on changes in FFM or SMM pose several methodological andanalytical challenges. Acute studies may assist by clarifying the optimal protein distributionand protein doses for changes in indicators of SMM synthesis. Further research is warrantedto assess the impact of protein dose and distribution, with consideration of other dietary intakevariables, on chronic changes in body composition amongst rugby union athletes.

AB - Introduction: Optimising protein intake to promote gains in skeletal muscle mass (SMM) isconsidered important by many athletes (Phillips et al, 2007). Research has suggested thatmuscle protein synthesis may be optimised by a single 20g protein dose (approximately~0.3g·kg-1body mass) with no further stimulation at higher doses (Moore et al, 2007). Oneacute study reported enhanced muscle protein synthesis when protein was consumed afterresistance training as several small 20g doses, rather than larger, less frequent doses (Aretaet al, 2012). This study aimed to examine self-reported protein distribution and dose in elitedevelopment rugby union athletes. A secondary aim was to assess the relationship betweenprotein distribution and changes in fat-free mass (FFM) over a rugby pre-season.Methods: 25 athletes (20.5±2.3yrs; 100.2±13.3kg) completed a 7d food diary. Food portionguides and Foodworks v.6.0.2562 (2009) were used to quantify food intake. Proteindistribution scores were calculated as the number of times an eating occasion (>15 minutesapart) achieved a target amount of protein (20g or individually calculated target based on0.3g·kg-1i.e. 30.0±4.0g) averaged per day. FFM was measured by dual energy x-rayabsorptiometry.Results: The mean number of eating occasions was 5.6±1.0. The protein distribution scoresfor 20g and calculated protein target were 3.8±1.0 (68±18% of eating occasions) and 2.8±1.1(50±20% of eating occasions) respectively. 2.0±0.9 (36±16%) of all eating occasionsexceeded the calculated protein target by more than 50%. The effect of 20g proteindistribution score on changes in FFM was not significant (p=0.15); regression analysis wasimpacted by statistical power and multicollinearity.Discussion: This study provides evidence that rugby players select a meal plan that includeslarger, less frequent doses of protein. However, it is unclear whether protein distributionimpacts on chronic changes in FFM. Chronic studies monitoring associations between dietaryintake and protein distribution on changes in FFM or SMM pose several methodological andanalytical challenges. Acute studies may assist by clarifying the optimal protein distributionand protein doses for changes in indicators of SMM synthesis. Further research is warrantedto assess the impact of protein dose and distribution, with consideration of other dietary intakevariables, on chronic changes in body composition amongst rugby union athletes.

M3 - Abstract

ER -

MacKenzie K, King N, Byrne N, Slater G. Protein dose and quantity amongst elite rugby players. 2013. Abstract from European Congress of Sports Science 2013, Barcelona, Spain.