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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 7
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: Brazilian Journal of Medical and Biological Research; v. 51, n. 11 2018.
Web of Science Citations: 1
Abstract

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)

FAPESP's process: 09/01842-0 - Analysis of central and peripheral muscle metabolism and adjustments on dynamic versus resistance exercise in coronary arterial disease patients: effects of resistance physical training program based on anaerobic threshold by different methodologies
Grantee:Audrey Borghi Silva
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 18/03233-0 - Study of cardiorespiratory interaction and the supply of peripheral and cerebral oxygen as modulators of exercise capacity during bilevel application in the coexistence of COPD-CHF
Grantee:Cássia da Luz Goulart
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)