Skip navigation

Effects of beef protein supplementation in male elite triathletes: a randomized, controlled, double-blind, cross-over study

Effects of beef protein supplementation in male elite triathletes: a randomized, controlled, double-blind, cross-over study

Valenzuela, Pedro L., Montalvo, Zigor, Mata, Fernando, González, Manuela, Larumbe-Zabala, Eneko and Naclerio, Fernando ORCID: 0000-0001-7405-4894 (2020) Effects of beef protein supplementation in male elite triathletes: a randomized, controlled, double-blind, cross-over study. Journal of the American College of Nutrition. ISSN 0731-5724 (Print), 1541-1087 (Online) (In Press) (doi:https://doi.org/10.1080/07315724.2020.1727377)

[img] PDF (Author's Accepted Manuscript)
26902 NACLERIO_Effects_Of_Beef_Protein_Supplementation_In_Male_Elite_Triathletes_(AAM)_2020.pdf - Accepted Version
Restricted to Repository staff only until 18 March 2021.

Download (667kB) | Request a copy
[img] PDF (Acceptance Email)
26902 NACLERIO_Acceptance_Email_2020.pdf - Additional Metadata
Restricted to Repository staff only

Download (73kB) | Request a copy

Abstract

Objective:
Beef protein extracts are growing in popularity in recent years due to their purported anabolic effects as well as to their potential benefits on hematological variables. The present randomized, controlled, double-blind, cross-over study aimed to analyze the effects of beef protein supplementation on a group of male elite triathletes (Spanish National Team).

Methods:
Six elite triathletes (age, 21 ± 3 years; VO2max, 71.5 ± 3.0 ml·kg·min-1) were randomly assigned to consume daily either 25 g of a beef supplement (BEEF) or an isoenergetic carbohydrates (CHO) supplement for 8 weeks, with both conditions being separated by a 5 week washout period. Outcomes, including blood analyses and anthropometrical measurements, were assessed before and after each 8-week intervention.

Results:
No effects of supplement condition were observed on body mass nor on skinfold thicknesses, but BEEF induced significant and large benefits over CHO in the thigh crosssectional area (3.02%, 95%CI=1.33 to 4.71 %; p=0.028, d=1.22). Contrary to CHO, BEEF presented a significant increase in vastus lateralis muscle thickness (p=0.46), but differences between conditions were not significant (p=0.173, d=0.87). Although a significantly more favorable testosterone-to-cortisol ratio (TCR) was observed for BEEF over CHO (37%, 95% CI=5 to 68 %; p=0.028, d=1.29), no significant differences were found for the hematological variables (i.e., iron, ferritin, red blood cell count, hemoglobin or hematocrit).

Conclusion:
Beef protein supplementation seems to facilitate a more favorable anabolic environment (i.e., increased TCR and muscle mass) in male elite triathletes, with no impact on hematological variables.

Item Type: Article
Uncontrolled Keywords: nutrition, supplement, endurance, muscle mass, anabolism
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Faculty / Department / Research Group: Faculty of Education, Health & Human Sciences
Faculty of Education, Health & Human Sciences > Department of Life & Sports Sciences
Last Modified: 31 Mar 2020 15:58
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/26902

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics