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Anunciacao P.G.,State University Londrina | Casonatto J.,North Parana University | Polito M.D.,State University Londrina
International SportMed Journal | Year: 2011

Background: There is little information about heart rate variability (HRV) in the context of studies involving post-exercise hypotension, principally resistance exercise. Research question: This study aimed to verify the responses of blood pressure (BP) after resistance exercise performed at three different intensities with the same volume. Type of study: The type of study design used to answer the question was transversal. Methods: Ten non-hypertensive men randomly performed three sessions of resistance exercises at different intensities (40, 60 and 80% 1RM) with the same volume. BP and heart rate variability (HRV) were monitored for 60min after interventions. Results: The results were expressed as mean and standard deviation. The diastolic BP remained low in the average monitoring period in the intensities of 40% (rest=68.2±7.5; post=56.5±6.5 mmHg; p=0.0001), 60% (rest=68.0±5.0; post=56.6±6.3 mmHg; p=0.0001) and 80% 1RM (rest=69.6±8.0; post=58.8±7.4 mmHg; p=0.0001). The same was true for the mean BP at the intensities of 40% (rest=86.5±5.8; post=76.1±6.3 mmHg; p=0.0001), 60% (rest=86.3±5.6; post=76.8±7.1 mmHg; p=0.0001) and 80% 1RM (rest=87.6±5.4; post=78.6±7.01 mmHg; p=0.0001). Although the average systolic BP of the post-exercise monitoring period was very similar across exercise intensities, these values were statistically lower than those at rest only at 40% 1RM (rest=123.2±8.9; post=115.3±10.0 mmHg; p=0.04). HRV showed greater sympathetic activation after the exercise session regardless of intensity. Conclusion: There aren't differences in the responses of BP after exercise at different intensities and same workload. Thus resistance exercise at any of these three intensities can promote BP reductions in non-hypertensive individuals. The execution of resistance exercise at light intensities may be interesting for exercise prescription in non-hypertensive subjects, because there are sufficient strength gains related to health, besides providing greater adherence to exercise practice.


Costa J.B.Y.,University of Londrina | Anunciacao P.G.,University of Londrina | Ruiz R.J.,University of Londrina | Casonatto J.,North Parana University | Polito M.D.,University of Londrina
International SportMed Journal | Year: 2012

Background: The consumption of a dose of caffeine (CAF) may attenuate post-exercise hypotension. Research question: The purpose was to verify the effect of a dose of CAF on systolic (SBP) and diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR) and heart rate variability (HRV) after a session of aerobic exercise in normotensive individuals. Type of study: Randomized controlled study. Methods: Ten healthy, physically active men (24.4 ± 4.5yrs; 74.3 ± 11.8kg; 172.8 ± 8.6m; 36.8 ± 5.7ml.kg -1.min -1) were randomly submitted to two experimental protocols in distinct days, in a cross-over double-blind design, with the ingestion of 4mg.kg -1 of CAF or placebo and performance of an aerobic exercise in a cycle ergometer at 60% VO 2peak. SBP, DBP, MAP, HR and HRV components were assessed at the pre-exercise rest period, 60 min after substance ingestion and during 60min post-exercise. Results: At the post-ingestion period, there were reductions on basal HR on both sessions and mean rises of 5mmHg on SBP, of 7-8mmHg on DBP and of 6-7mmHg on MAP on the caffeine session. After exercise, there were reductions of 5-7mmHg on SBP, significant on the 30 th and 40 thmin, on the placebo session. During the caffeine session, maintenance of raised HR levels, no difference in relation to the pre-exercise period for SBP and MAP, and higher blood pressure compared to the placebo session. HRV was altered in each session; however there were no differences between the experimental sessions. Conclusion: The ingestion of a 4mg.kg -1 dose of CAF apparently does not significantly interfere on the cardiovascular behaviour after a session of aerobic exercise.


Colognesi G.O.,North Parana University | dos Santos L.F.,North Parana University | Gomez R.J.H.C.,State University Londrina | Roig S.M.,North Parana University | Suguimoto H.H.,North Parana University
Agrociencia | Year: 2015

The use of residues from dairy industry is interesting because of the ease of acquisition and a relatively low cost. The objective of this study was to analyze ethanol production by the Saccharomyces fragilis varying the concentration of cheese whey powder (CWP) solution, initial pH and inoculum concentration using a factorial design technique; besides, semi-batch operations to add lactose was investigated. Statistical analysis was performed by ANOVA (p≤0.05). The concentrations of CWP solution and initial pH were significant in the fermentation medium for ethanol production. The optimum conditions were CWP solution 15 %, pH 5.0, inoculum concentration 5 % and a fermentation time of 18 h, and ethanol production reached 7.6 % (v/v). Additionaly, semi-batch operations performed to add lactose also modified the ethanol yield (10.67 % v/v). This would be the first time that a high ethanol production rate was obtained from S. fragilis using cheese whey powder solution and a factorial design technique.


Martignago C.C.S.,North Parana University | Oliveira R.F.,North Parana University | Pires-Oliveira D.A.A.,North Parana University | Oliveira P.D.,North Parana University | And 3 more authors.
Lasers in Medical Science | Year: 2014

Low-level laser therapy treatment (LLLT) is widely used in rehabilitation clinics with the aim of accelerating the process of tissue repair; however, the molecular bases of the effect of LLLT have not been fully established. The aim of the present study was to evaluate the influence of the exposure of different doses of LLLT on the expression of collagen genes type I alpha 1 (COL1α1) and vascular endothelial growth factor (VEGF) in the fibroblast cells of mice (L929) cultivated in vitro. Fibroblast cells were irradiated with a Gallium-Arsenide laser (904 nm) every 24 h for 2 consecutive days, stored in an oven at 37 °C, with 5 % CO2 and divided into 3 groups: G1—control group, G2—irradiated at 2 J/cm2, and G3—irradiated at 3 J/cm2. After irradiation, the total RNA was extracted and used in the complementary DNA (cDNA) synthesis. The gene expression was analyzed by real-time polymerase chain reaction. The cells irradiated in G2 exhibited a statistically significant growth of 1.78 in the expression of the messenger RNA (mRNA) of the COL1α1 gene (p = 0.036) in comparison with G1 and G3. As for the VEGF gene, an increase in expression was observed in the two irradiated groups in comparison with the control group. There was an increase in expression in G2 of 2.054 and G3 of 2.562 (p = 0.037) for this gene. LLLT (904 nm) had an influence on the expression of the genes COL1α1 (2 J/cm2) and VEGF (2 e 3 J/cm2) in a culture of the fibroblast cells of mice. © 2014, Springer-Verlag London.


Martignago C.C.S.,North Parana University | Oliveira R.F.,North Parana University | Pires-Oliveira D.A.A.,North Parana University | Oliveira P.D.,North Parana University | And 3 more authors.
Lasers in Medical Science | Year: 2014

Low-level laser therapy treatment (LLLT) is widely used in rehabilitation clinics with the aim of accelerating the process of tissue repair; however, the molecular bases of the effect of LLLT have not been fully established. The aim of the present study was to evaluate the influence of the exposure of different doses of LLLT on the expression of collagen genes type I alpha 1 (COL1α1) and vascular endothelial growth factor (VEGF) in the fibroblast cells of mice (L929) cultivated in vitro. Fibroblast cells were irradiated with a Gallium-Arsenide laser (904 nm) every 24 h for 2 consecutive days, stored in an oven at 37 °C, with 5 % CO2 and divided into 3 groups: G1-control group, G2-irradiated at 2 J/cm2, and G3-irradiated at 3 J/cm2. After irradiation, the total RNA was extracted and used in the complementary DNA (cDNA) synthesis. The gene expression was analyzed by real-time polymerase chain reaction. The cells irradiated in G2 exhibited a statistically significant growth of 1.78 in the expression of the messenger RNA (mRNA) of the COL1α1 gene (p = 0.036) in comparison with G1 and G3. As for the VEGF gene, an increase in expression was observed in the two irradiated groups in comparison with the control group. There was an increase in expression in G2 of 2.054 and G3 of 2.562 (p = 0.037) for this gene. LLLT (904 nm) had an influence on the expression of the genes COL1α1 (2 J/cm2) and VEGF (2 e 3 J/cm2) in a culture of the fibroblast cells of mice. © 2014 Springer-Verlag London.

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