Marcos Pinotti Barbosa

Acute Effects of Resistance Training with Local Vibration

The aim of this study was to verify the acute effects of the application of local vibration on upper limbs during resistance training on the number of maximum repetitions, metabolic and hormonal responses. 32 volunteers performed a maximum voluntary contraction test during a lat pulldown exercise. After the test, all volunteers underwent one conventional resistance training session and one resistance training session with local vibration. In both interventions, volunteers performed 4 sets with the highest possible number of repetitions of the lat pulldown exercise at 55% of maximum voluntary contraction. During the vibratory resistance training intervention, vibration was locally applied (20-Hz and 12-mm). During the conventional resistance training, volunteers performed the same procedures without vibration. Blood samples were taken at each experimental session before and 5 min after the end of each intervention. No significant differences were observed in number of maximum repetitions between the series of vibratory and conventional training. Serum testosterone, cortisol and lactate were significantly increased after 2 interventions. Vibratory resistance training induced greater increases in testosterone and lactate concentrations. No significant changes were found in creatine kinase, creatinine or urea concentration. These data indicate that local vibration increases the metabolic and anabolic response to the resistance training, without changing the training volume.

The assessment of the thermal necrosis due a drilling dental process with or without irrigation

The main objective of this work is to present a methodology to assess the thermal necrosis in a dental model due a drilling process with and without water irrigation. An experimental methodology, using an infrared thermography camera, was used to measure the rate of temperature change during the drilling in a pig mandible. The finite element method is used with the ANSYS program to compare the results with the experimental model. A simplified model was analyzed in a transient thermal process. Using appropriated boundary conditions, successful numerical results could be used as an alternative to the in-vivo models.

Mathematical and Computational Aspects in Partial Ventriculectomy

In order to verify if the partial ventriculectomy (Batista procedure) is still in use in some countries, as well as to verify if there are reports of mathematical aspects in literature that may be useful to achieve better results when using this procedure, a detailed bibliographic research has been done. As a result, it was verified that several works from renowned researchers in this area report how important it is to state a way to calculate precisely the dimensions of the cardiac slice to be removed in this procedure, pointing out that this may reduce the chances of later complications, thereby increasing its success rate. In many of these works, it is also pointed out the necessity of preserving the ventricular apex. It is concluded that the real possibility of improvements for the efficiency for this surgical procedure exists, and it is presented in a simple mathematical model, which is able to identify with relative accuracy the dimensions of the cardiac slice to resect, which can be improved over time and computationally implemented to automate this surgical protocol step.

Mathematical model for partial ventriculectomy

This paper presents a determining mathematical model of the slice to be removed from the human heart patients with Dilated Cardiomyopathy in the surgical process called Partial Ventriculectomy or Batista surgery. The model is based on the use of techniques of integral and differential calculus for determining the left ventricle surface area of patients with and without the disease, and calculating of the occurred surface change. As a result, we obtain a simple model for determining a ventricular surface area and presenting a form to determine the ellipse -shaped slice dimensions to be removed.

Efeito da aplicação de vibração mecânica sobre a impulsão vertical

Several studies have indicated that vibratory training can contribute to the development of muscle strength and sports performance. The aim of this study was to investigate the effect of mechanical vibration application in the direction of the result of muscle forces vector addition on vertical jump. Eighteen volunteers performed vertical jump test 20 s before and after the application of mechanical vibration of 20 Hz and 6 mm amplitude in the direction of the result of muscle forces vector addition. The same volunteers were used as control group by performing the vertical jump test without pre- and post-test vibration application. The vibratory training caused an significantly increase of 8,5% at vertical jump height while jump height did not vary significantly in the control experiment. These data suggest that the application of mechanical vibration in the direction of muscle forces vector addition can increase the performance in vertical jumps.

Aperfeiçoamento em prótese intraluminal sem sutura, para substituição segmentar da aorta: comunicação breve

OBJECTIVE: To report on an improved model of intraluminal sutureless prosthesis for partial aortic replacement. METHOD: A grooved multidrilled plastic ring was employed to facilitate the intraoperative handcrafting of the vascular prosthesis and its sutureless intraluminal fixation to the aorta. A 42 years old male patient with type A Dissecting Aneurysm was treated by the Bentall - De Bono technique using a valved and ringed bovine vascular prosthesis which was implanted in the aortic annulus with interrupted sutures and tied distally inside the aorta. RESULTS: The improved ringed vascular prosthesis simplified the sutureless intraluminal anastomosis procedure. The postoperative evolution was uneventfull and the patient remains asymptomatic one year after the operation. CONCLUSION: The improved ringed vascular prosthesis simplified the intraluminal sutureless procedure for treatment of dissecting aneurysm of the aorta.