Medical Express

ISSN (print): 2318-8111

ISSN (online): 2358-0429

Author's Articles

11 result(s) for: Vitor E. Valenti

Cardiovascular responses induced by acute video game boxing performance in healthy women

Luciano Moreira de Souza; Raquel Annoni; Luiz Carlos de Abreu; Vitor E. Valenti; Erica E. Valenti; Fernando R. Oliveira; Rodrigo D. Raimundo; Sidney Benedito Silva

MEDICALEXPRESS 2014;1(3):153-157 - ORIGINAL RESEARCH

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BACKGROUND: Previous studies suggested that some interactive video games induce cardiovascular responses. However, some different styles of video games have not been investigated.
OBJECTIVE: We aimed to evaluate cardiovascular responses induced by video game boxing performance in healthy women.
METHOD: We evaluated ten female sedentary volunteers, aged 20.9 ± 1.4 years, weight 58.7 ± 8.0 kg, height 163.2 ± 5.4cm. All subjects were weighed and measured. Their heart rate, blood pressure and lactate levels were recorded before and after video game performance. The volunteers played a Sony video game (Nintendo® Wii) by using the boxing method, in which all volunteers played for 10 minutes without interruption. At the end of the game the volunteers were reassessed using the same parameters mentioned above.
RESULTS: At the end of the video game boxing performance we observed highly significant increases of lactate production (p < 0.0035) and the double product (heart rate vs. systolic blood pressure) was also higher (p < 0.0001). Both parameters indicate that the performance increased demands of the cardiovascular system.
CONCLUSION: We conclude that a ten-minute video game boxing performance induces cardiovascular responses similar to aerobic exercise. This may be a practical form of exercise, but care should be exercised concerning subjects with cardiovascular disorders.



Keywords: Video Games; Lactic Acid; Physiology, Cardiovascular; Oxygen Consumption.

Pain assessment in patients with adolescent idiopathic scoliosis at different stages of disease evolution

Alberto Ofenhejm Gotfryd; Fernando José Franzin; Patricia Rios Poletto; Luiz Carlos de Abreu; Vitor E. Valenti; Luciano Miller Reis Rodrigues

MEDICALEXPRESS 2014;1(4):170-173 - ORIGINAL RESEARCH

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OBJECTIVE: The correlation between pain complaints and the severity of the spinal curvature in adolescent idiopathic scoliosis remains controversial. The aim of this study was to evaluate the presence and intensity of back pain in adolescent idiopathic scoliosis patients at different stages of the disease.
METHODS: Sixty-four individuals participated in this study with scoliotic curves (Cobb angles) between 20 and 90 degrees. Patients were divided into four groups according to the scoliotic curves: Group 1 (with 20 to 45 degrees) Group 2 (curves greater than 45 degrees before surgery), Group 3 (curves greater than 45 degrees one year after posterior spinal arthrodesis with pedicle screws) and Group 4 (healthy adolescents between 11 and 18 years of age; control group).
RESULTS: The scores obtained from the pain domain of the SRS-30 questionnaire (specifically developed for the assessment of adolescent scoliosis) were significantly worse for patients with scoliosis, regardless of the evolutionary phase of the disease. Patients who underwent surgical treatment presented statistically better results one year after surgery than did the group of patients with moderate Cobb angles.
CONCLUSION: Patients with adolescent idiopathic scoliosis had a higher intensity of back pain than healthy individuals. Pain was reduced one year after spinal arthrodesis.



Keywords: scoliosis; adolescent; pain.

Short term exposure to cigarette smoke on general activity and anxiety

Vitor E. Valenti; Rodrigo Y. Taniguchi; Carlos A. Lazarini; Luiz Carlos de Abreu; Flávia C. Goulart

MEDICALEXPRESS 2014;1(4):180-183 - ORIGINAL RESEARCH

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OBJECTIVE: Sidestream cigarette smoke differs from mainstream smoke because it presents more intense effects. We aimed to evaluate the performance of rats exposed to short term sidestream cigarette smoke during open field and elevated plus-maze tests.
METHOD: Cigarette exposure was carried out during 5 days. The rats were exposed to the cigarette smoke during one hour. Elevated plus-maze and open field tests were applied according to previous studies. During the open field test we measured the time spent stopped, raising and the number of times that the rat intercepted each cross (locomotion). We examined the number of entries in the open and closed arms and the time spent in the closed and open arms during elevated plus-maze test.
RESULTS: Control group presented significantly higher values regarding locomotion and raising during the open field test. No difference was noted between the groups regarding the elevated plus-maze test.
CONCLUSION: Sidestream cigarette smoke exposure for short term on rats affects their performance during the open field test.



Keywords: tobacco; anxiety; rats.

Cardiac autonomic responses induced by auditory stimulation with music is influenced by affinity

Bruna de O. Plassa; Réveni C. Milan; Heraldo L. Guida; Luiz Carlos de Abreu; Rodrigo D. Raimundo; Luana A. Gonzaga; Vitor E. Valenti

MEDICALEXPRESS 2014;1(4):206-210 - ORIGINAL RESEARCH

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INTRODUCTION: We aimed to evaluate the effects of musical auditory stimulation on cardiac autonomic regulation in subjects who enjoy and who do not enjoy the music.
METHOD: The study was performed in young women (18-27 years old) divided in two groups (1) volunteers who enjoyed the music and (2) volunteers who did not enjoy the music. Linear indices of heart rate variability were analyzed in the time domain. The subjects were exposed to a musical piece (Pachelbel: Canon in D Major) during 10 minutes. Heart rate variability was analyzed at rest with no music and during musical auditory stimulation.
RESULTS: In the group that enjoyed the music the standard deviation of normal-to-normal R-R intervals (SDNN) was significantly reduced during exposure to musical auditory stimulation. We found no significant changes for the other linear indices. The group composed of women who did not enjoy the music did not present significant cardiac autonomic responses during exposure to musical auditory stimulation.
CONCLUSION: Women who enjoyed the music presented a significant cardiac autonomic response consisting of a reduction in heart rate variability induced by the musical auditory stimulation. Those who did not enjoy the musical piece presented no such response.



Keywords: Hearing; Autonomic nervous system; Cardiovascular physiology.

High intensity exercise training worsens alveolar destruction in pulmonary emphysema rats

Viviani Barnabé; Fernanda D.T. Lopes; Beatriz M. Saraiva-Romanholo; Clarice O. Rosa; Rogerio Pazetti; Vitor E. Valenti; Milton de Arruda Martins

MEDICALEXPRESS 2014;1(5):227-232 - ORIGINAL RESEARCH

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OBJECTIVE: Investigation of standard intensities of physical exercise is important to better comprehend and develop rehabilitation programs for emphysema. We aimed to evaluate the effects of different intensities (moderate and high-intensity) of physical exercise on the development of a protease-induced (papain intratracheal instillation) emphysema in rats.
METHODS: Male Wistar rats were randomly separated into five groups that received intratracheal instillation of papain solution or vehicle: (i) papain high intensity exercise, (ii) papain moderate exercise, (iii) saline high intensity exercise, (iv) saline sedentary and (v) papain sedentary. Forty days after intratracheal instillation, the exercise groups were submitted to an exercise-training protocol on a treadmill during 10 weeks, 5 days/week, at 0.9 km/h (Papain and saline high exercise), or at 0.6 km/h (papain moderate exercise).We measured respiratory system elastance and resistance, the collagen fiber lung parenchyma, and the pulmonary mean linear intercept.
RESULTS: All animal groups that received papain instillation presented higher alveolar wall destruction compared to animals that received only saline solution. The papain high intensity exercise group presented higher values of mean linear intercept compared to emphysema groups that were trained at a moderate intensity or not submitted to exercise.
CONCLUSION: High intensity exercise training worsened alveolar destruction in an experimental model of emphysema in rats when compared to moderate intensity exercise, or to no exercise.



Keywords: Emphysema; Pulmonary Disease; Chronic Obstructive; Exercise; Rats.

Responses of the geometric indices of heart rate variability to the active orthostatic test in women

Luiz Carlos de Abreu; Adriano L. Roque; Bianca C.R. de Castro; Ana C. Amorim de Souza; Luiz Carlos M. Vanderlei; Lucas L. Ferreira; Rodrigo D. Raimundo; Fernando L.A. Fonseca; Vitor E. Valenti; José R. Cisternas

MEDICALEXPRESS 2014;1(6):351-355 - ORIGINAL RESEARCH

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OBJECTIVES: The effects of the orthostatic test on the cardiovascular system have been investigated, but there are no data on the behavior of the geometric indices of heart rate variability. We evaluated the effects of the active orthostatic test on the geometric indices of heart rate variability in women.
METHOD: The study was performed on 12 healthy women between ages 18 and 30. For the analysis of heart rate variability, heart rate was recorded beat-to-beat. The RR intervals were transformed into geometric figures, and from these we calculated the triangular index, the triangular interpolation of RR intervals, the SD1, SD2 indexes and the SD1/SD2 ratio, which were obtained from the Poincaré plot. Visual analysis of the plot was also performed. For the test, participants quickly stood up from a seated position in 3 seconds or less, and remained standing still for 15 minutes. Heart rate variability samples were collected at four moments: rest, 0-5 minutes, 5-10 minutes and 10-15 minutes at standing position.
RESULTS: The triangular index, the triangular interpolation of RR intervals, the SD1 and SD2 indices were reduced (p < 0.05) at 10-15 minutes after the volunteers stood up from seated position. The SD1/SD2 ratio was decreased at 0-15 minutes after the subjects changed from seated to orthostatic position.
CONCLUSION: The geometric indices of heart rate variability decreased in response to the active orthostatic test in healthy women.



Keywords: Autonomic Nervous System; Cardiovascular System; Nonlinear Dynamics; Physiology.

Cardiac autonomic modulation adjustments in isometric exercise

Ana Márcia dos Santos António; Marco Aurélio Cardoso; Joice A. T. do Amaral; Luiz Carlos de Abreu; Vitor E. Valenti

MEDICALEXPRESS 2015;2(1):M150102 - REVIEW

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OBJECTIVE: Isometric exercise is characterized by promoting an overload on the cardiovascular system due to pulsatile contraction followed by a significant increase in muscle blood flow. The hemodynamic responses during exercise and during recovery from endurance exercise are well documented. However, there are few studies with hard data regarding the influence of isometric exercise on autonomic control, which can be obtained by analysis of heart rate variability. Thus, the object of this study was to analyze reports on cardiac autonomic regulation in isometric exercise.
METHODS: The articles used in this study were selected fromPubmed, PEDro,Medline, Lilacs and SciELO. The search wasmade by crossing the following keywords: isometric exercise, autonomic nervous system, cardiovascular system, and heart rate variability, which were defined based on descriptors of Health Headings (MeSH).
RESULTS: The search provided 17 articles in isometric exercise autonomic modulation characterized by decreased vagalmodulation followedby increased sympatheticmodulation and its reversal shortly after the endof the activity.
CONCLUSION: During isometric exercise, increased sympathetic modulation and reduced vagal modulation of the sinus node have been reported.



Keywords: Autonomic Nervous System; Exercise; Cardiovascular System.

Symbolic analysis of heart rate variability and its interaction with p-value of normality tests applied on RR intervals

Andrey A. Porto; Celso Ferreira; Luiz Carlos de Abreu; David M. Garner; Luana Gonzaga; Vitor E. Valenti

MEDICALEXPRESS 2016;3(2):M160204 - ORIGINAL RESEARCH

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OBJECTIVE: A previous study suggested that the p-value of normality test applied to RR intervals is an index able to quantify Heart Rate Variability (HRV) through correlation of traditional time and frequency domain indices. We investigate the association between the p-value of normality test applied in RR intervals and symbolic analysis of HRV.
METHOD: We evaluated 32 healthy women between 18 and 30 years old. RR intervals were used for HRV analysis and we performed symbolic analysis, where RR intervals are joined by symbols. Sets of three consecutive symbols (RR intervals) were grouped into four types of clusters, as follows: 1. Three equal symbols (zero variation); 2: two equal, one divergent symbol (one variation); 3. Three different symbols monotonically ascending or descending (two like variations); 4. Three different symbols, forming a peak or a trough (two unlike variations). Frequency of occurrence of each type of cluster was calculated. Normality tests were applied to all RR intervals and the p-value was calculated. We computed the correlations between the p-value of normality test and symbolic analysis of HRV.
RESULTS: Correlation coefficients between the p-value of normality test from Kolmorogov-Smirnov test and the four types of clusters showed no correlation for any of them. Likewise, the correlation coefficient index between the p-value of normality test calculated from the Shapiro-Wilk test and symbolic analysis produced no significant results for any of the four types of clusters.
CONCLUSION: There was no significant correlation between the p-value of normality test and HRV symbolic analysis. The physiological significance of this result is that the PNT is not related to chaotic behavior of HRV.



Keywords: Autonomic nervous system; Cardiovascular system; Cardiovascular physiology; Gaussian distribution.

Chaotic analysis of heart rate dynamics after an exercise with flexible pole

Ana M. S. Antonio; David M. Garner; Rodrigo D. Raimundo; Luiz Carlos de Abreu; Marcelo T. Navega; Vitor E. Valenti

MEDICALEXPRESS 2016;3(5):M160505 - ORIGINAL RESEARCH

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INTRODUCTION: Exercises with a flexible pole have been applied in clinical practice for upper limb rehabilitation. Nevertheless, its acute effects on cardiac autonomic regulation are unclear.
OBJECTIVE: To evaluate the acute effects of exercise with flexible pole on complex behavior of heart rate variability (HRV).
METHOD: We investigated 32 healthy female volunteers aged between 18 and 25 years who performed a session of exercise with a flexible pole. HRV was analyzed 10 minutes before and 10 minutes immediately after the exercise.
RESULTS: Exercises with a flexible pole did not significantly change time and frequency domain indices of HRV. Non-linear analysis of HRV through the Higuchi Fractal Dimension was not significantly changed during recovery from exercise compared to the control reading at rest.
CONCLUSION: Exercises with the flexible pole were unable to acutely change chaotic behavior of heart rate dynamics. This is advantageous for assessments of levels of rehabilitative treatment required in such patients; and their susceptibility to dynamical diseases.



Keywords: Autonomic Nervous System; Higuchi Fractal Dimension Rehabilitation Medicine.

Higuchi Fractal Analysis of Heart Rate Variability is Sensitive during Recovery from Exercise in Physically Active Men

Rayana L. Gomes; Luiz Carlos M. Vanderlei; David M. Garner; Franciele M. Vanderlei; Vitor E. Valenti

MEDICALEXPRESS 2017;4(3):M170302 - ORIGINAL RESEARCH

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OBJECTIVE: Nonlinear techniques to assess heart rate variability (HRV) have received much recent attention. We aimed to evaluate nonlinear HRV responses during recovery from exercise through the novel algorithm Higuchi Fractal Dimension.
METHOD: We examined 35 healthy male volunteers aged between 18 and 35 years old. For the training of exercise intensity we used 60% of Vmax determined through a progressive test using the Conconi threshold. HRV was analyzed 10 minutes before and 10 minutes after exercise. We analyzed the geometric indices of HRV (SD1, a measure of short-term HRV and SD2, a measure of long-term HRV) and applied the Higuchi Fractal Dimension to RR intervals.
RESULTS: During recovery from exercise the Poincaré plot indices SD1 and SD1/SD2 decreased while SD2 and SD2/SD1 increased (p<0.0001) compared to control at rest. All parameters of Higuchi Fractal Dimension analysis were lowered after exercise compared to control at rest (p<0.0001).
CONCLUSION: Physical exercise acutely decreased the chaotic behavior of HRV as measured through the Higuchi Fractal Dimension analysis. Physiologically, this indicates that we detected complex changes in HRV immediately after exercise.



Keywords: Cardiovascular system; Autonomic Nervous System; Physical Exercise; Nonlinear Dynamics; Higuchi Fractal Dimension.

Involvement of rest diastolic arterial pressure in autonomic heart rate recovery from exercise in normotensive men

Rayana L. Gomes; Luiz Carlos M. Vanderlei; Franciele M. Vanderlei; David M. Garner; Rodrigo D. Raimundo; Luiz Carlos de Abreu; Vitor E. Valenti

MEDICALEXPRESS 2017;4(6):M170604 - ORIGINAL RESEARCH

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OBJECTIVE: Rest arterial pressure has been shown to be associated with cardiovascular mortality. Autonomic heart rate control during recovery from exercise is estimated to detect changes in cardiovascular system, which may lead to cardiovascular diseases. We assessed the involvement of rest diastolic arterial pressure (DAP) on heart rate dynamics after exercise in normotensive physically active men.
METHOD: We evaluated healthy physically active men aged 18 to 22 years old divided into two unequal groups: G1- rest DAP between 80 and 90 mmHg (N=11) and G2- rest DAP < 80mmHg (N=24). Volunteers performed physical exercise on a treadmill with intensity equivalent to 60% of Vmax. Heart rate recovery in the first (HRR1) and third (HRR3) minute after exercise were measured and heart rate variability (HRV) was examined in the time and frequency domain. Additionally, we performed the quantitative analysis of the Poincaré plot. HRV was recorded in the following phases: the 10-minute period before exercise, during exercise and the 60 minute period after exercise.
RESULTS: We found no significant difference between G1 and G2 concerning HRV changes during exercise. The G2 group exhibited a delayed recovery of SDNN, RMSSD, RRTri, LF, HF, LF/HF, SD1 and SD2 indices during recovery from exercise. HRR1 and HRR3 was greater in the G2 group.
CONCLUSION: Normotensive physically active men with DAP between 80 and 90 mmHg presented faster heart rate recovery and an accelerated recovery of heart rate autonomic control after aerobic exercise.



Keywords: Arterial Pressure; Autonomic Nervous System; Cardiovascular Physiological Phenomena; Cardiovascular system.