title: Concurrent Training Decreases Cortisol but Not Zinc Concentrations: Effects of Distinct Exercise Protocols.
abstract: Objectives. To investigate the effects of distinct concurrent training (CT) protocols on zinc and cortisol concentrations and test the correlation between these blood variables. Methods. Samples of serum zinc and cortisol were assessed from 10 male subjects (27.1 ± 4.8 years old; BMI 25.38 ± 0.09) before and immediately after each study session: control (CS = no exercises), concurrent training 1 (CT1 = indoor cycling + strength training), and concurrent training 2 (CT2 = strength training + indoor cycle) with five days of interval between each. Results. There were no significant changes in zinc concentrations after the CS (Δ% = 8.45; p = 0.07), CT1 (Δ% = 4.77; p = 0.49), and CT2 (Δ% = -2.90; p = 0.12) sessions. Cortisol levels showed significant decrease after CS (Δ% = -6.02; p = 0.00), CT1 (Δ% = -26.32; p = 0.02), and CT2 (Δ% = -33.57; p = 0.05) sessions. There was a significant correlation between the variables only at CS (zinc post versus cortisol pre: r = 0.82 and cortisol post: r = 0.82). Conclusions. CT decreases cortisol concentrations regardless of the sequence performed. No changes were found in zinc concentrations after the study sessions. The reduction in serum cortisol concentrations appear to occur by a mechanism independent of the zinc status.
authors.affiliation: Research Group in Physical Exercise and Health Promotion, Physical Education Department, Castelo Branco University, Avenida Santa Cruz, 1631 Realengo, 21710-250 Rio de Janeiro, RJ, Brazil; Laboratory of Human Kinetics, The Federal University of State of Rio de Janeiro (LABIMH/UNIRIO), Brazil.
authors.forename: Guilherme
authors.initials: G
authors.lastname: Rosa
authors.affiliation: Research Group in Physical Exercise and Health Promotion, Physical Education Department, Castelo Branco University, Avenida Santa Cruz, 1631 Realengo, 21710-250 Rio de Janeiro, RJ, Brazil; Research Institute of Brazilian Army Physical Capacitation (IPCFEx), RJ, Brazil.
authors.forename: Marcos de Sá Rego
authors.initials: Mde S
authors.lastname: Fortes
authors.affiliation: Research Group in Physical Exercise and Health Promotion, Physical Education Department, Castelo Branco University, Avenida Santa Cruz, 1631 Realengo, 21710-250 Rio de Janeiro, RJ, Brazil; Laboratory of Human Kinetics, The Federal University of State of Rio de Janeiro (LABIMH/UNIRIO), Brazil; Physical Education College of the Brazilian Army (EsEFEx), RJ, Brazil.
authors.forename: Danielli B
authors.initials: DB
authors.lastname: de Mello