Cardiorespiratory and metabolic determinants during moderate and high resistance exercise intensities until exhaustion using dynamic leg press: comparison with critical load

Autor(es)

Arakelian, V. M. ^{[1, 2, 3]} ; Goulart, C. L. ^[2] ; Mendes, R. G. ^[2] ; Caruso, F. C. ^[2] ; Baldissera, V. ^[3] ; Arena, R. ^[4] ; Borghi-Silva, A. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Programa Posgrad Interunidades Bioengn, Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Fisioterapia, Lab Fisioterapia Cardiopulm, Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, Dept Ciencias Fisiol, Lab Fisiol Exercicio, Sao Carlos, SP - Brazil

^[4] Univ Illinois, Dept Phys Therapy, Chicago, IL - USA

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Medical and Biological Research; v. 51, n. 11 2018.
• Citações Web of Science: 1

Resumo

The objective of this study was to assess cardiovascular, respiratory, and metabolic responses during a commonly used dynamic leg press resistance exercise until exhaustion (TEx) at different intensities and compare with critical load (CL). This was a prospective, cross-sectional, controlled, and crossover study. Twelve healthy young men (23±2.5 years old) participated. The subjects carried out three bouts of resistance exercise in different percentages of 1 repetition maximum (60, 75, and 90% 1RM) until TEx. CL was obtained by means of hyperbolic model and linearization of the load-duration function. During all bout intensities, oxygen uptake (VO2), carbon dioxide production (VCO2), ventilation (VE), and respiratory exchange ratio (RER) were obtained. Variations (peak-rest=Δ) were corrected by TEx. In addition, systolic and diastolic blood pressure (SBP and DBP), blood lactate concentration [La-] and Borg scores were obtained at the peak and corrected to TEx. CL induced greater TEx as well as number of repetitions when compared to all intensities (P<0.001). During CL, Borg/TEx, ΔSBP/TEx, ΔDBP/TEx, and [La-] were significantly lower compared with 90% load (P<0.0001). In addition, VO2, VCO2, VE, and RER were higher during CL when compared to 90 or 75%. TEx was significantly correlated with VO2 on CL (r=0.73, P<0.05). These findings support the theory that CL constitutes the intensity that can be maintained for a very long time, provoking greater metabolic and ventilatory demand and lower cardiovascular and fatigue symptoms during resistance exercise. (AU)

• Processo FAPESP: 09/01842-0 - Análise dos ajustes centrais e metabólicos periféricos durante o exercício físico dinâmico versus resistido em pacientes com DAC: efeitos de um programa de treinamento resistido baseado na determinação do limiar anaeróbio por diferentes metodologias
• Beneficiário: Audrey Borghi Silva
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 18/03233-0 - Estudo da interação cardiorrespiratória e da oferta de oxigênio periférica e cerebral como moduladores da capacidade de exercício durante a aplicação do binível na coexistência da DPOC-ICC
• Beneficiário: Cássia da Luz Goulart
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto