HEART RATE AND LOWER LIMB MUSCLE ACTIVITY ON CYCLE ERGOMETER

Paulo Rui De Oliveira,Bruno Mazziotti Oliveira Alves,Edgar Ramos Vieira,Robson Dias Scoz,Thiago Rosa De Mesquita,Cesar Ferreira Amorim,Rubens Alexandre Da Silva Junior

doi:10.1590/1517-8692202026062019_005

Abstract

ABSTRACT Introduction: Muscle activity in the pedal stroke movement on a cycle ergometer can be measured by surface electromyography, as an effective and improved method for studying muscle action and objectively determining the different action potentials of the muscles involved in specific movements. Heart rate behavior is an important factor during exercise with load. Objective: To identify heart rate behavior and pattern of muscle activity of the rectus femoris and vastus medialis in healthy subjects in the pedaling dynamic at different loads, submaximal test, on an instrumented cycle ergometer. Methods: 20 healthy adults were evaluated. Heart rate measurement was performed, together with electromyographic analysis, in the time domain, of the rectus femoris and vastus medialis muscles during incremental exercise of the lower limbs on the cycle ergometer. Results: Heart rate behavior presented significant difference for p≥0.05 in relation to increased loads. The EMG signal intensity from the vastus medialis muscle (normalized RMS value) in each quadrant of the pedaling cycle showed significant difference for p≥0.05 in relation to quadrants I, II and IV and significant difference for p≥0.05 in relation to quadrants III and IV. In the rectus femoris (RF) muscle, there was significant difference for p≥0.05 in relation to quadrants I, II and IV and significant difference for p≥0.05 in relation to quadrants I, II and III. Conclusion: An increase in heart rate proportional to the increase in load was observed, as well as an increase in the amplitude of the electromyographic signal proportional to the increase in load. It was possible to identify the pattern of muscle activation in the studied quadrants during pedal stroke movements, independent of load. Level of evidence III; Study of non-consecutive patients; without uniform application of the “gold” standard reference.

Highlights

Muscle activity in the pedal stroke movement on a cycle ergometer can be measured by surface electromyography, as an effective and improved method for studying muscle action and objectively determining the different action potentials of the muscles involved in specific movements
The objective of the present study was to identify the heart rate behavior and pattern of muscle activity of the rectus femoris and vastus medialis in healthy individuals in the pedaling dynamics at different loads, submaximal test, in the instrumented ergometer cycle, with the hypothesis of increasing the amplitude of the electromyographic signal of the vastus medialis and rectus femoris muscles, proportional to the increase in load. This is an observational cross-sectional study, in which heart rate and electromyographic signals from the rectus femoris and vastus medialis muscles of the dominant lower limb of healthy individuals were evaluated during the cycle of pedaling at different loads
Hug e Dorel[29], in the comparison between groups, it showed significant differences for the magnitude of the EMG signal, when compared by quadrants of the pedal. This data could be observed in this study, since the vastus medialis muscle had a greater activity in the first quadrant and the rectus femoris, had a greater activity in the fourth quadrant of the pedal

Summary

Introduction

Muscle activity in the pedal stroke movement on a cycle ergometer can be measured by surface electromyography, as an effective and improved method for studying muscle action and objectively determining the different action potentials of the muscles involved in specific movements. Objective: To identify heart rate behavior and pattern of muscle activity of the rectus femoris and vastus medialis in healthy subjects in the pedaling dynamic at different loads, submaximal test, on an instrumented cycle ergometer. Heart rate measurement was performed, together with electromyographic analysis, in the time domain, of the rectus femoris and vastus medialis muscles during incremental exercise of the lower limbs on the cycle ergometer. Scientific evidence points out that exercising physical activity and physical fitness exercises are factors that contribute to the improvement and / or maintenance of human health, indicating that its regularity and adequate dosage provide benefits for physical and mental health, for people in all the ages It is an important and determining factor in physical and psychological health. The exercise bike is generally used as a form of aerobic exercise for weight loss, cardiac rehabilitation and exercise testing[7]

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Conclusion