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Nutr Health. 2019 Mar 26:260106019838365. doi: 10.1177/0260106019838365. [Epub ahead of print]

Effects of higher habitual protein intake on resistance-training-induced changes in body composition and muscular strength in untrained older women: a clinical trial study.

Author information

1
1 Federal Institute of Science and Technology of Mato Grosso, Cuiabá, Mato Grosso, Brazil.
2
2 Physical Education and Sport Center, Londrina State University, Londrina, PR, Brazil.
3
3 Faculty of Physical Education, University of Campinas - Unicamp, Brazil.

Abstract

BACKGROUND::

Aging is accompanied by progressive and accentuated decline in muscular strength and skeletal muscle mass, affecting health and functional autonomy. Both resistance training (RT) and diet are strategies that may contribute to improvement in the health of the elderly.

AIM::

The purpose of this study was to evaluate the effects of higher habitual protein intake on RT-induced changes in body composition and strength in untrained postmenopausal women.

METHODS::

Seventy older women were submitted to an RT program. Body composition, muscular strength, and dietary intake (24 h dietary recall) were performed pre- and post-intervention. To verify different intervention effects according to protein intake of the participants, the sample was separated into tertiles according to protein intake: low, moderate, and high protein intake.

RESULTS::

A time vs. group interaction ( p < 0.05) was observed, with high protein intake presenting greater increases compared with low protein intake, for skeletal muscle mass (5.3% vs. 1.3%), lower limb lean soft tissue (4.9% vs. 1.4%), upper lean soft tissue (4.9% vs. 1.2%), preacher curl (24% vs. 15.2%), and total strength (16.4% vs. 11.7%). A time vs. group interaction ( p < 0.05) was observed, with high protein intake presenting greater increases compared with moderate protein intake, for skeletal muscle mass (5.3% vs. 3.2%). In all groups, a main effect of time ( p < 0.05) was observed for knee extension and chest press.

CONCLUSIONS::

We conclude that intake of >1.0 g/kg/day of protein promotes gains in skeletal muscle mass and muscular strength after RT in untrained older women.

KEYWORDS:

Strength training; aging; dietary intake; hypertrophy; resistance training

PMID:
30909813
DOI:
10.1177/0260106019838365

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