The measurement and interpretation of dietary protein distribution during a rugby preseason

Kristen MacKenzie, Gary Slater, Neil King, Nuala Byrne

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

Evidence suggests that increasing protein distribution may be desirable to promote muscle protein synthesis (MPS) in combination with resistance exercise. However, there is a threshold above which additional protein consumption has limited benefit for MPS and may promote protein loss due to increased oxidation. This study aimed to measure daily protein intake and protein distribution in a cohort of rugby players. Twenty-five developing elite rugby union athletes (20.5 ± 2.3 years, 100.2 ± 13.3 kg, 184.4 ± 7.4 cm) were assessed at the start and end of a rugby preseason. Using a 7-day food diary the reported daily protein intake was 2.2 ± 0.7 g·kg·day-1 which exceeds daily recommendations. The reported carbohydrate intake was 3.6 ± 1.3 g·kg·day-1 which may reflect a suboptimal intake or dietary underreporting. In general, the rugby athletes were regularly consuming more than 20 g of protein; 3.8 ± 0.9 times per day (68 ± 18% of eating occasions). In addition to documenting current dietary intakes, an excess protein estimation score was calculated to determine how frequently the rugby athletes consumed protein above a known effective dose with a margin of error. 2.0 ± 0.9 eating occasions contained protein in excess of doses (20 g) known to promote MPS. Therefore, it is currently unclear whether the consumption of regular large doses of protein will benefit rugby athletes via increasing protein distribution, or whether high protein intakes may have unintended effects including a reduction in carbohydrate and/or energy intake.

Original languageEnglish
Pages (from-to)353-358
Number of pages6
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Volume25
Issue number4
DOIs
Publication statusPublished - 1 Aug 2015

Fingerprint

Football
Dietary Proteins
dietary protein
athletes
Proteins
proteins
muscle protein
protein intake
Athletes
Muscle Proteins
protein synthesis
dosage
ingestion
strength training
carbohydrate intake
protein depletion
food records
Eating
Carbohydrates
Diet Records

Cite this

@article{aa700ed4ba204cfeb4e772ebe17c7568,
title = "The measurement and interpretation of dietary protein distribution during a rugby preseason",
abstract = "Evidence suggests that increasing protein distribution may be desirable to promote muscle protein synthesis (MPS) in combination with resistance exercise. However, there is a threshold above which additional protein consumption has limited benefit for MPS and may promote protein loss due to increased oxidation. This study aimed to measure daily protein intake and protein distribution in a cohort of rugby players. Twenty-five developing elite rugby union athletes (20.5 ± 2.3 years, 100.2 ± 13.3 kg, 184.4 ± 7.4 cm) were assessed at the start and end of a rugby preseason. Using a 7-day food diary the reported daily protein intake was 2.2 ± 0.7 g·kg·day-1 which exceeds daily recommendations. The reported carbohydrate intake was 3.6 ± 1.3 g·kg·day-1 which may reflect a suboptimal intake or dietary underreporting. In general, the rugby athletes were regularly consuming more than 20 g of protein; 3.8 ± 0.9 times per day (68 ± 18{\%} of eating occasions). In addition to documenting current dietary intakes, an excess protein estimation score was calculated to determine how frequently the rugby athletes consumed protein above a known effective dose with a margin of error. 2.0 ± 0.9 eating occasions contained protein in excess of doses (20 g) known to promote MPS. Therefore, it is currently unclear whether the consumption of regular large doses of protein will benefit rugby athletes via increasing protein distribution, or whether high protein intakes may have unintended effects including a reduction in carbohydrate and/or energy intake.",
author = "Kristen MacKenzie and Gary Slater and Neil King and Nuala Byrne",
year = "2015",
month = "8",
day = "1",
doi = "10.1123/ijsnem.2014-0168",
language = "English",
volume = "25",
pages = "353--358",
journal = "International Journal of Sport Nutrition",
issn = "1526-484X",
publisher = "Human Kinetics Publishers Inc.",
number = "4",

}

The measurement and interpretation of dietary protein distribution during a rugby preseason. / MacKenzie, Kristen; Slater, Gary; King, Neil; Byrne, Nuala.

In: International Journal of Sport Nutrition and Exercise Metabolism, Vol. 25, No. 4, 01.08.2015, p. 353-358.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The measurement and interpretation of dietary protein distribution during a rugby preseason

AU - MacKenzie, Kristen

AU - Slater, Gary

AU - King, Neil

AU - Byrne, Nuala

PY - 2015/8/1

Y1 - 2015/8/1

N2 - Evidence suggests that increasing protein distribution may be desirable to promote muscle protein synthesis (MPS) in combination with resistance exercise. However, there is a threshold above which additional protein consumption has limited benefit for MPS and may promote protein loss due to increased oxidation. This study aimed to measure daily protein intake and protein distribution in a cohort of rugby players. Twenty-five developing elite rugby union athletes (20.5 ± 2.3 years, 100.2 ± 13.3 kg, 184.4 ± 7.4 cm) were assessed at the start and end of a rugby preseason. Using a 7-day food diary the reported daily protein intake was 2.2 ± 0.7 g·kg·day-1 which exceeds daily recommendations. The reported carbohydrate intake was 3.6 ± 1.3 g·kg·day-1 which may reflect a suboptimal intake or dietary underreporting. In general, the rugby athletes were regularly consuming more than 20 g of protein; 3.8 ± 0.9 times per day (68 ± 18% of eating occasions). In addition to documenting current dietary intakes, an excess protein estimation score was calculated to determine how frequently the rugby athletes consumed protein above a known effective dose with a margin of error. 2.0 ± 0.9 eating occasions contained protein in excess of doses (20 g) known to promote MPS. Therefore, it is currently unclear whether the consumption of regular large doses of protein will benefit rugby athletes via increasing protein distribution, or whether high protein intakes may have unintended effects including a reduction in carbohydrate and/or energy intake.

AB - Evidence suggests that increasing protein distribution may be desirable to promote muscle protein synthesis (MPS) in combination with resistance exercise. However, there is a threshold above which additional protein consumption has limited benefit for MPS and may promote protein loss due to increased oxidation. This study aimed to measure daily protein intake and protein distribution in a cohort of rugby players. Twenty-five developing elite rugby union athletes (20.5 ± 2.3 years, 100.2 ± 13.3 kg, 184.4 ± 7.4 cm) were assessed at the start and end of a rugby preseason. Using a 7-day food diary the reported daily protein intake was 2.2 ± 0.7 g·kg·day-1 which exceeds daily recommendations. The reported carbohydrate intake was 3.6 ± 1.3 g·kg·day-1 which may reflect a suboptimal intake or dietary underreporting. In general, the rugby athletes were regularly consuming more than 20 g of protein; 3.8 ± 0.9 times per day (68 ± 18% of eating occasions). In addition to documenting current dietary intakes, an excess protein estimation score was calculated to determine how frequently the rugby athletes consumed protein above a known effective dose with a margin of error. 2.0 ± 0.9 eating occasions contained protein in excess of doses (20 g) known to promote MPS. Therefore, it is currently unclear whether the consumption of regular large doses of protein will benefit rugby athletes via increasing protein distribution, or whether high protein intakes may have unintended effects including a reduction in carbohydrate and/or energy intake.

UR - http://www.scopus.com/inward/record.url?scp=84930622989&partnerID=8YFLogxK

U2 - 10.1123/ijsnem.2014-0168

DO - 10.1123/ijsnem.2014-0168

M3 - Article

VL - 25

SP - 353

EP - 358

JO - International Journal of Sport Nutrition

JF - International Journal of Sport Nutrition

SN - 1526-484X

IS - 4

ER -