AUTHOR=Roth Christian , Rettenmaier Lukas , Behringer Michael 

TITLE=Corrigendum: High-Protein Energy-Restriction: Effects on Body Composition, Contractile Properties, Mood, and Sleep in Active Young College Students

JOURNAL=Frontiers in Sports and Active Living

VOLUME=Volume 3 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2021.762606

DOI=10.3389/fspor.2021.762606

ISSN=2624-9367

ABSTRACT=Background: It is often advised to ensure a high-protein intake during energy-restricted
diets. However, it is unclear whether a high-protein intake is able to maintain muscle
mass and contractility in the absence of resistance training.
Materials and Methods: After 1 week of body mass maintenance (45 kcal/kg),
28 male college students not performing resistance training were randomized to
either the energy-restricted (ER, 30 kcal/kg, n = 14) or the eucaloric control group
(CG, 45 kcal/kg, n = 14) for 6 weeks. Both groups had their protein intake
matched at 2.8 g/kg fat-free-mass and continued their habitual training throughout
the study. Body composition was assessed weekly using multifrequency bioelectrical
impedance analysis. Contractile properties of the m. rectus femoris were examined with
Tensiomyography and MyotonPRO at weeks 1, 3, and 5 along with sleep (PSQI) and
mood (POMS).
Results: The ER group revealed greater reductions in body mass (1 −3.22 kg vs.
1 1.90 kg, p < 0.001, partial η² = 0.360), lean body mass (1 −1.49 kg vs. 1 0.68 kg, p
< 0.001, partial η² = 0.152), body cellmass (1 −0.85 kg vs. 1 0.59 kg, p < 0.001, partial
η² = 0.181), intracellular water (1 −0.58 l vs. 1 0.55 l, p < 0.001, partial η² = 0.445) and
body fat percentage (1 −1.74% vs. 1 1.22%, p < 0.001, partial η² = 433) compared to
the CG. Contractile properties, sleep onset, sleep duration as well as depression, fatigue
and hostility did not change (p > 0.05). The PSQI score (1 −1.43 vs. 1 −0.64, p =
0.006, partial η² = 0.176) and vigor (1 −2.79 vs. 1 −4.71, p = 0.040, partial η² =
0.116) decreased significantly in the ER group and the CG, respectively.
Discussion: The present data show that a high-protein intake alone was not able
to prevent lean mass loss associated with a 6-week moderate energy restriction in
college students. Notably, it is unknown whether protein intake at 2.8 g/kg fat-free-mass
prevented larger decreases in lean body mass. Muscle contractility was not negatively
altered by this form of energy restriction. [TRUNCATED]