Influência de posições do joelho no torque e atividade mioelétrica do tríceps sural na flexão plantar isométrica máxima

Baptista, Marco Túlio; Nascimento, Francisco Xavier Monteiro do; Nardes, Leandro Kegler; Matta, Thiago Torres da; Oliveira, Líliam Fernandes de

doi:10.1590/1807-55092014000200197

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…Baptista et al (15) observed the gastrocnemius activation presented 40.5% (lateral) and 31.7% (medial) higher in RMS value when knee flexion was controlled. Also, knee flexion implied to soleus an increase of 35.6% in RMS when the knee was extended.…”

Section: Resultsmentioning

confidence: 96%

Does feet position alter triceps surae EMG record during heel-raise exercises in leg press machine?

Pereira¹,

Azevedo²,

Politti³

et al. 2020

mtprehabjournal

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Background: muscle activation measured by electromyography (EMG) provides additional insight into functional differences between movements and muscle involvement. Objective: to evaluate the EMG of triceps surae during heel-raise exercise in healthy subjects performed at leg press machine with different feet positions. Methods: ten trained healthy male adults aged between 20 and 30 years voluntarily took part in the study. After biometric analyses the EMG signals were obtained using a 8-channel telemeterized surface EMG system (EMG System do Brazil, Brazil Ltda) (amplifier gain: 1000x, common rejection mode ratio >100 dB, band pass filter: 20 to 500 Hz). All data was acquired and processed using a 16-bit analog to digital converter, with a sampling frequency of 2kHz on the soleus (Sol), medial (GM) and lateral (GL) gastrocnemius muscles in both legs, in accordance with the recommendations of SENIAN. The root mean square (RMS) of the EMG amplitude was calculated to evaluate muscle activity of the three muscles. After being properly prepared for eletromyography procedures, all subjects were instructed to perform 3 sets of 5 repetitions during heel-raise exercise using the maximal load that enabled 10 repetitions on leg press 45° machine, each set being performed with one of the following feet positions: neutral (0º), internal and external rotation (both with 45° from neutral position). The tests were sequential and applied a 5-minute rest interval between sets. The order of the tests was randomized. Results: thought had been found interaction (F=0.27, P= 0.75) on RMS parameters and feet position, the values of Sol muscle were significantly (F=17.86, P= 0.003) lower compared with GL and GM muscles independently of feet position. Conclusion: The change in the feet position during the heel-rise exercise performed in the leg press does not influence the activation of the triceps surae, and the soleus is less activated than the gastrocnemius in that exercise.

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Section: Resultsmentioning

confidence: 96%

Does feet position alter triceps surae EMG record during heel-raise exercises in leg press machine?

Pereira¹,

Azevedo²,

Politti³

et al. 2020

mtprehabjournal

View full text Add to dashboard Cite

show abstract

“…Hypertrophied muscle increases its function with greater efficiency. In this case, the calf musculature has a fundamental role in the regulation of blood pressure, as it acts in the prevention of vascular diseases in the lower limbs (LL) 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Effect of high-intensity interval training on the skeletal muscle of spontaneously hypertensive rats

Aleixo

Castoldi

Souza

et al. 2021

Motriz: rev. educ. fis.

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This study aimed to evaluate the effect of High-Intensity Interval Training (HIIT) on the skeletal muscle of Spontaneously Hypertensive Rats (SHR). Method: In total, 20 male rats, SHR, 12 months old, were used, distributed into 2 groups: Control Group (C) and Training Group (HIIT). The training lasted approximately 50 minutes/day, 5 days/week, for 8 weeks. Systolic blood pressure (BP) was measured at the beginning and end of the study. Analysis: The medial gastrocnemius muscle was used to measure the smallest fiber diameter, after which the Shapiro-Wilk normality test was performed, followed by the Mann Whitney test to compare the medians and interquartile intervals (IQI) of the muscle fibers and Student t-test for performance. For analysis of BP, Analysis of Variance -ANOVA was used, followed by Tukey's post-test. All procedures adopted a significance value of 5% (p < 0.05). Results: The median values for the variable "smallest diameter" of muscle fibers were 29.48 (IQI: 9.96) µm in the C group and 33.45 (IQI: 9.44) µm in the HIIT group (p < 0.05). Also, the performance was increased in the trained animal group and blood pressure values decreased significantly at the end of the experiment (p < 0.05). Conclusion: The HIIT intensity promoted an increase in the median values of the muscle fibers and performance. Finally, a significant decrease was observed in blood pressure variation values.

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Influência de posições do joelho no torque e atividade mioelétrica do tríceps sural na flexão plantar isométrica máxima

Abstract: Rev Bras Educ Fís Esporte, (São Paulo) 2014 Infl uência de posições do joelho no torque IntroduçãoInfl uência de posições do joelho no torque e atividade mioelétrica do tríceps sural na fl exão plantar isométrica máxima CDD. 20.ed. 616.7 796.023http://dx

Cited by 2 publications

References 29 publications

Does feet position alter triceps surae EMG record during heel-raise exercises in leg press machine?

Does feet position alter triceps surae EMG record during heel-raise exercises in leg press machine?

Effect of high-intensity interval training on the skeletal muscle of spontaneously hypertensive rats

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