An elevated systolic blood pressure response at 8 minutes in full contact exercise may identify hypertensive subjects

The aim of this study was to identify hypertension (HT) in karate competitors (KCs) in high intensity exercise. Values were compared with an exercise control group (EC). The 84 subjects were randomly divided into two groups: KC and EC. Resting blood pressure (BP) was measured the day before and immediately precompetition. A further three measurements were taken postexercise for all subjects at 1-, 2-, and 8- minute intervals. At rest, day one, mean BP of KC was 134/84 ± 3/2 mmHg vs. EC, 124/72 ± 1/2 mmHg and on day 2, was 141/79 ± 3/2 mmHg vs. EC, 125/72 ± 1/2 mmHg, respectively. Eight minutes postcompetition, BP of KCs was 140/77 ± 2/1 mmHg vs. EC 135/75 ± 2/1 mmHg. High blood pressure (HBP) was recorded in 60.5% of KCs on day 2, and essential HT that required medical therapy was subsequently diagnosed in 5% of KCs. Five percent of EC also had HBP, but subsequent medical examination reported normal values.

Low-frequency electrical stimulation combined with a cooling vest improves recovery of elite kayakers following a simulated 1000-m race in a hot environment

This study compared the effects of a low-frequency electrical stimulation (LFES; Veinoplus® Sport, Ad Rem Technology, Paris, France), a low-frequency electrical stimulation combined with a cooling vest (LFESCR) and an active recovery combined with a cooling vest (ACTCR) as recovery strategies on performance (racing time and pacing strategies), physiologic and perceptual responses between two sprint kayak simulated races, in a hot environment (∼32 wet-bulb-globe temperature). Eight elite male kayakers performed two successive 1000-m kayak time trials (TT1 and TT2), separated by a short-term recovery period, including a 30-min of the respective recovery intervention protocol, in a randomized crossover design. Racing time, power output, and stroke rate were recorded for each time trial. Blood lactate concentration, pH, core, skin and body temperatures were measured before and after both TT1 and TT2 and at mid- and post-recovery intervention. Perceptual ratings of thermal sensation were also collected. LFESCR was associated with a very likely effect in performance restoration compared with ACTCR (99/0/1%) and LFES conditions (98/0/2%). LFESCR induced a significant decrease in body temperature and thermal sensation at post-recovery intervention, which is not observed in ACTCR condition. In conclusion, the combination of LFES and wearing a cooling vest (LFESCR) improves performance restoration between two 1000-m kayak time trials achieved by elite athletes, in the heat.

Los diferentes tipos de láser y sus aplicaciones en podología

Los diferentes tipos de láseres, sobre todo el láser de diodo, irrumpen en la terapéutica podológica para proporcionar una alternativa más de tratamiento en muchas patologías que son el día a día de las consultas. El buen manejo y el conocimiento de sus características son requisitos imprescindibles para no tener efectos secundarios indeseados y poder llevar a cabo tratamientos poco dolorosos, minimizando el tiempo total, y muchas veces proporcionando una solución a diversas patologías.

Revisión sistemática: programas de ejercicio en rehabilitación cardiaca intrahospitalaria versus rehabilitación cardiaca en casa para pacientes con evento coronario agudo

El objetivo de la rehabilitación cardiaca es lograr que los pacientes con enfermedades cardiacas, reanuden su vida activa y productiva; logrando un óptimo estado físico, psicosocial y vocacional. Los programas de ejercicio, son parte básica de la rehabilitación cardiaca. Existen muchos tipos de programas de actividad física, que varían entre programas de ejercicio en casa no supervisados, hasta programas intrahospitalarios altamente supervisados.

Variação diurna e resposta da cinética do VO2 de ciclistas durante exercício muito intenso

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Exercício físico e menopausa

A deficiência de estrógenos, as alterações do perfil lipídico, o ganho de peso e o sedentarismo são considerados os principais fatores para a maior prevalência de hipertensão arterial em mulheres na menopausa. Na tentativa de reduzir a incidência da hipertensão arterial nessa população, diversas abordagens têm sido empregadas, porém a maioria dos trabalhos mostra que, nesse momento, a mudança de estilo de vida parece ser a melhor estratégia para o controle da hipertensão arterial e de seus fatores de risco nessa fase de vida da mulher - entre elas a prática de atividade física regular. O exercício físico contínuo, no qual a intensidade é mantida constante (leve/moderada), tem sido empregado na maioria dos trabalhos dentro da área de Saúde, com evidentes efeitos benéficos sobre as doenças cardiovasculares e endócrino-metabólicas. A prescrição do exercício contínuo caracteriza-se por atividades de pelo menos 30 minutos, três dias por semana, numa intensidade de 50 a 70% da frequência cardíaca máxima. O exercício físico intermitente caracteriza-se por alterações em sua intensidade durante a realização do treinamento, podendo variar de 50 a 85% da frequência cardíaca máxima, durante dez minutos. Atualmente, o exercício físico intermitente tem sido também empregado como forma de treinamento físico em diversas clínicas de controle de peso e em treinamentos personalizados, o que é devido ao menor tempo de execução do exercício físico intermitente. Além disso, trabalhos mostram que as adaptações metabólicas e o condicionamento físico são similares aos observados no exercício contínuo, que exigem maior tempo de execução para obter as mesmas adaptações celulares. Assim, essa revisão abordou a importância do exercício físico no controle da pressão arterial bem como os principais estudos conduzidos em modelos experimentais de menopausa e em mulheres, relacionando a hipertensão arterial e os mecanismos envolvidos em sua gênese e as perspectivas futuras.

The Lactate Minimum Test protocol provides valid measures of cycle ergometer VO2 peak

Aim. The aim of the present study was to investigate the validity of the Lactate Minimum Test (LMT) for the determination of peak VO2 on a cycle ergometer and to determine the submaximal oxygen uptake (VO2) and pulmonary ventilation (VE) responses in an incremental exercise test when it is preceded by high intensity exercise (i.e., during a LMT).Methods. Ten trained male athletes (triathletes and cyclists) performed 2 exercise tests in random order on an electromagnetic cycle ergometer: 1) Control Test (CT): an incremental test with an initial work rate of 100 W, and with 25 W increments at 3-min intervals, until voluntary exhaustion; 2) LMT: an incremental test identical to the CT, except that it was preceded by 2 supramaximal bouts of 30-sec (similar to120% VO(2)peak) with a 30-sec rest to induce lactic acidosis. This test started 8 min after the induction of acidosis.Results. There was no significant difference in peak VO2 (65.6+/-7.4 ml.kg(-1).min(-1); 63.8+/-7.5 ml.kg(-1).min(-1) to CT and LMT, respectively). However, the maximal power output (POmax) reached was significantly higher in CT (300.6+/-15.7 W) than in the LMT (283.2+/-16.0 W).VO2 and VE were significantly increased at initial power outputs in LMT.Conclusion. Although the LMT alters the submaximal physiological responses during the incremental phase (greater initial metabolic cost), this protocol is valid to evaluate peak VO2, although the POmax reached is also reduced.

Efeito da associação de furosemida e fenilbutazona sobre variáveis hidroeletrolíticas de cavalos antes e após a corrida

The objective of this study was to verify the effects of furosemide and phenylbutazone association on fluid and electrolyte balance characteristics of horses before and after a race. Nineteen horses were divided into three groups according to treatment protocols. The first group (five animals - control) was not medicated. A second group (seven animals) was treated with furosemide (1mg/kg, intramuscular up to four hours before the race). A third group (seven animals) received furosemide (1mg/kg) and phenylbutazone (4.4 mg/kg), both intramuscular, up to four hours before race. Blood samples were collected before, immediately after and two hours after a race to evaluate the plasma osmolality and sodium, potassium and chloride concentrations. The use of furosemide and furosemide plus phenylbutazone up to four hours before the race altered (P<0.05) the plasma osmolality but did not change (P>0.05) the sodium, potassium and chloride concentrations. It was not possible to determine an antagonist effect of phenylbutazone on furosemide, based on fluid and electrolyte balance. Due to the high intensity exercise, the increase in plasma osmolality and potassium concentration was attributed to the race effect.

La suplementación pre-ejercicio con carbohidrato de alta concentración perjudica el rendimiento en el ejercicio de alta intensidad en bicicleta

Objectives. To evaluate the effects of pre-exercise high concentration carbohydrate supplementation on performance, cardiovascular, metabolic and hormonal responses during high intensity cycling exercise. Method. Seven male cyclists (28.7 ± 5.4 years; 65.2 ± 4.7 kg body weight), who performed two continuous exercise trials under placebo (PLA) or carbohydrate (CHO) ingestion at a work rate of 80% VO 2max until exhaustion, participated in the study. The cyclists received 5 ml.kg-1 of a maltodextrin solution diluted at a concentration of 10% (CHO) or placebo (PLA) at 60, 45 and 30 min pre-exercise. Results. A 5.4% reduction in the time to exhaustion was observed in the CHO trial compared to the PLA trial. In both trials, glucose and lactate levels were higher in the post-trial condition compared to pre-exercise values (p < 0.05). Free fatty acid levels were lower in the CHO group than in the PLA group both before and after the trial (p < 0.05). Insulinemia was higher during the pre-trial in the CHO group (42.7 ± 3.6 μU.ml-1) compared to the PLA condition (11.8 ± 3.3 μU.ml-1) (p < 0.05), and even decreased to 23.8 ± 5.1 μU.ml-1 during exercise after CHO intake (p < 0.05). No significant differences in plasma cortisol were observed between the two trials (p > 0.05). Conclusions. Pre-exercise high concentration CHO supplementation resulted in impaired performance in high intensity cycling exercise and decreased free fatty acid levels. © 2010 Revista Andaluza de Medicina del Deporte.

Efeito de dois programas de treinamento físico sobre a função autonômica cardíaca e nível de atividade física na vida diária em pacientes portadores de doença pulmonar obstrutiva crônica (DPOC)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência do treinamento físico de alta intensidade sobre o metabolismo de ratos espontaneamente hipertensos (SHR)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Eletroforetograma das proteínas do soro de equinos submetidos a diferentes protocolos de exercícios

Pós-graduação em Medicina Veterinária - FMVZ

Análise da cinética de remoção de lactato em atletas de canoagem slalom

The aim of this study was to verify the kinetics of lactate production and removal in slalom kayak athletes, K1 category, during official competition. Eight male athletes (22,6 ± 4,3 years) participated of the study. For the analysis of lactate, 25µL of capillary blood were collected. The kinetics of lactate removal was performed before the warm-up (Pre), just after the competitors exit from the river (Post 0'), 5 (Post 5'), and 20 (Post 20') minutes. The results demonstrated a significant increase in lactate concentrations (9.8 mmol/l, 9.4 mmol/l and 6.6 mmol/l) at 0', 5' and 20' post respectively, with values of P<0.01. The findings indicate that after 20 minutes the values of lactate reduced significantly (P<0.05) compared to Pre exercise, suggesting that the athletes would indicate good metabolic conditions for the second turn of the race.

Efeito da suplementação com vitamina E sobre os metabolismos oxidativo e cardíaco em equinos submetidos a exercício de alta intensidade

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Administração de maltodextrina em cavalos submetidos a teste de exercício progressivo e a exercícios sequenciais de alta intensidade e curta duração em esteira

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)