Vitamin D Supplementation Does Not Enhance Gains in Muscle Strength and Lean Body Mass or Influence Cardiorespiratory Fitness in Vitamin D-Insufficient Middle-Aged Men Engaged in Resistance Training

Overview

Journal Nutrients

Date 2024 Oct 16

PMID 39408324

Authors

Lauri Savolainen

Saima Timpmann

Martin Mooses

Evelin Maestu

Luule Medijainen

Mart Lellsaar

Kristi Tiimann

Anneli Piir

Mihkel Zilmer

Eve Unt

Vahur Oopik

Affiliations

Soon will be listed here.

Abstract

Background: This study checked whether vitamin D (Vit-D) supplementation improves the efficacy of resistance training (RT) in terms of increasing muscle strength and lean body mass (LBM), and influencing cardiorespiratory fitness (VOmax) in Vit-D-deficient middle-aged healthy men.

Methods: Participants ( = 28) were quasi-randomly assigned to one of two groups, which, in a double-blind manner, supplemented their diet daily with either Vit-D (8000 IU; VD) or placebo (PLC) during participation in a 12-week supervised RT program.

Results: During the intervention, serum Vit-D concentrations increased 2.6-fold ( < 0.001) in the VD group, while no changes occurred in the PLC group. Muscle strength gains ( < 0.001) as measured in seven exercises performed on RT equipment and increases ( < 0.001) in LBM were similar in the two groups. Total fat mass, percent total fat, and percent android fat decreased ( < 0.05) to a similar extent in both groups, but there was no change in VOmax in either group.

Conclusions: In conclusion, in healthy Vit-D-insufficient middle-aged men engaged in resistance training, Vit-D supplementation increases serum 25(OH)D levels but does not enhance gains in muscle strength and LBM, or decreases in fat mass and fat percentage, and does not affect cardiorespiratory fitness.

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