Alterations in Heart Rate, Blood Lactate Accumulation and Perceived Exertion at Lactate Threshold as a Consequence of Exercise Training in the Elderly

Abstract

OBJECTIVE. The purpose of this investigation was to examine the alterations in heart rate, blood lactate accumulation and perceived exertion (RPE) at lactate threshold (LT) as a consequence of exercise training in elderly. METHODS. Thirty-seven elderly aged >65 yr., served as training group (n=20) and control group (n=17). All participants performed the submaximal bench stepping test before and after the twelve-week intervention in order to determine the metabolic equivalents (METs), heart rate, lactate concentration and RPE at LT. The subjects in the training group performed the bench stepping exercise at LT for 20 minutes or more every day during the intervention. RESULTS. After the intervention, METs and heart rate at LT signifi cantly increased compared with those at baseline level in the training group (p the training group (p the training group ( <0.01), whereas neither RPE nor lactate concentration at LT changed signifi cantly. Furthermore the increase of heart rate at LT signifi cantly correlated with the increase of METs at LT or heart rate at LT for baseline level (p the increase of METs at LT or heart rate at LT for baseline level (p the increase of METs at LT or heart rate at LT for baseline level ( <0.01). CONCLUSION. The heart rate at LT may increase in association with the increase of the aerobic capacity especially in individuals with lower fi tness level and /or at the beginning of the training program, in contrast to RPE and lactate concentration at LT.

Confiabilidade de um circuito multimodal incremental na determinação do limiar anaeróbio de idosos por meio da dosagem do lactato sanguíneo

“…Nosso estudo teve a proposta pioneira de investigar as variáveis de um TEI realizado em circuito com exercícios multimodais. Similarmente, alguns trabalhos têm verificado respostas fisiológicas individuais utilizando outros exercícios e testes incrementais graduais (ALLERTON;EARNEST;JOHANNSEN, 2018;ZAGATTO et al, 2016;NAKAMURA et al, 2015;SOUZA, 2013;AYABE et al, 2006).…”

“…Diferentes pesquisadores também avaliaram intensidades de limiares (1 e 2) e identificaram reprodutibilidade e confiabilidade utilizando tipos diferentes de ergômetros ou testaram a validade de exercícios por meio da análise de correlação com protocolos padrão (cicloergômetro, esteira) (ALLERTON; EARNEST; JOHANNSEN, 2018;NAKAMURA et al, 2015;AYABE et al, 2006;MAGASSO, 2010;HOFF et. al., 2002 et al, 2000).…”