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A low carbohydrate diet affects autonomic modulation during heavy but not moderate exercise

Lima-Silva, Adriano Eduardo; Bertuzzi, Rômulo Cássio de Moraes; Pires, Flavio de Oliveira; Fronchetti, Lenise; Gevaerd, Monique S.; De-Oliveira, Fernando R.
Fonte: SPRINGER Publicador: SPRINGER
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
56.33%
The aim of this study was to examine the effects of low carbohydrate (CHO) availability on heart rate variability (HRV) responses during moderate and severe exercise intensities until exhaustion. Six healthy males (age, 26.5 +/- 6.7 years; body mass, 78.4 +/- 7.7 kg; body fat %, 11.3 +/- 4.5%; (V) over dotO(2max), 39.5 +/- 6.6 mL kg(-1) min(-1)) volunteered for this study. All tests were performed in the morning, after 8-12 h overnight fasting, at a moderate intensity corresponding to 50% of the difference between the first (LT(1)) and second (LT(2)) lactate breakpoints and at a severe intensity corresponding to 25% of the difference between the maximal power output and LT(2). Forty-eight hours before each experimental session, the subjects performed a 90-min cycling exercise followed by 5-min rest periods and subsequent 1-min cycling bouts at 125% (V) over dotO(2max) (with 1-min rest periods) until exhaustion, in order to deplete muscle glycogen. A diet providing 10% (CHO(low)) or 65% (CHO(control)) of energy as carbohydrates was consumed for the following 2 days until the experimental test. The Poicare plots (standard deviations 1 and 2: SD1 and SD2, respectively) and spectral autoregressive model (low frequency LF, and high frequency HF) were applied to obtain HRV parameters. The CHO availability had no effect on the HRV parameters or ventilation during moderate-intensity exercise. However...

Adjuncts to Physical Training of Patients With Severe COPD: Oxygen or Noninvasive Ventilation?

BORGHI-SILVA, Audrey; MENDES, Renata Goncalves; TOLEDO, Andreza Cristina; SAMPAIO, Luciana Maria Malosa; SILVA, Tatiane Patrocinio da; KUNIKUSHITA, Luciana Noemi; SOUZA, Hugo Celso Dutra de; SALVINI, Tania F.; COSTA, Dirceu
Fonte: DAEDALUS ENTERPRISES INC Publicador: DAEDALUS ENTERPRISES INC
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.25%
BACKGROUND: Previous studies have shown positive effects from noninvasive ventilation (NIV) or supplemental oxygen on exercise capacity in patients with COPD. However, the best adjunct for promoting physiologic adaptations to physical training in patients with severe COPD remains to be investigated. METHODS: Twenty-eight patients (mean +/- SD age 68 +/- 7 y) with stable COPD (FEV(1) 34 +/- 9% of predicted) undergoing an exercise training program were randomized to either NIV (n = 14) or supplemental oxygen (n = 14) during group training to maintain peripheral oxygen saturation (S(pO2)) >= 90%. Physical training consisted of treadmill walking (at 70% of maximal speed) 3 times a week, for 6 weeks. Patients were assessed at baseline and after 6 weeks. Assessments included physiological adaptations during incremental exercise testing (ratio of lactate concentration to walk speed, oxygen uptake [(V) over dot(O2)], and dyspnea), exercise tolerance during 6-min walk test, leg fatigue, maximum inspiratory pressure, and health-related quality of life. RESULTS: Two patients in each group dropped out due to COPD exacerbations and lack of exercise program adherence, and 24 completed the training program. Both groups improved 6-min walk distance...

Avaliação de força muscular em pacientes pediátricos com asma persistente grave; Muscle strength evaluation in pediatric patient whit severe persistent asthma

Barros, Fabiane Villa Adala
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 17/03/2010 Português
Relevância na Pesquisa
36.25%
Parece ser consenso na literatura que as crianças asmáticas apresentam capacidade física reduzida, mas existem poucos estudos comparando a capacidade aeróbia de crianças asmáticas com não asmáticas. Além disto, estudos com pacientes pneumopatas crônicos têm demonstrado que eles apresentam fraqueza da musculatura periférica que parece contribuir para a redução na capacidade de exercício. Até o presente momento desconhecemos estudos que tenham avaliado força muscular periférica em crianças asmáticas. Em vista disto, o objetivo deste estudo foi avaliar a força e a resistência muscular periférica assim como a capacidade aeróbia em crianças com asma persistente leve e grave. Foram avaliadas 60 crianças com idade entre 8 e 15 anos, divididas em 3 grupos: asma persistente leve (APL), asma persistente grave (APG) e não asmáticas (controle) (n=20 cada). Estudo transversal e controlado que avaliou a força (teste de 1RM) e a resistência muscular periférica (teste com 50% de 1RM), a capacidade aeróbia máxima (VO2pico), a função pulmonar e fatores de saúde relacionados à qualidade de vida. A força e a resistência muscular foram avaliadas utilizando os exercícios de leg-press (perna), chest-press (peitorais) e remada (dorsais). Nossos resultados mostraram que os 3 grupos eram similares com relação à idade e IMC (p>0...

Efeito do exercício físico na inflamação pulmonar e na resposta imunológica sistêmica em pacientes com asma persistente moderada ou grave; Effect of exercise on pulmonary inflammation and systemic immune response in patients with moderate or severe persistent asthma

Mendes, Felipe Augusto Rodrigues
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 17/10/2013 Português
Relevância na Pesquisa
36.19%
A asma é uma doença pulmonar inflamatória crônica com alta prevalência e que leva a importantes danos funcionais à saúde e à qualidade de vida do paciente. A fisiopatologia da asma é caracterizada por intensa imunorregulação e o exercício físico pode ter um papel importante nesta resposta inflamatória devido a seus efeitos imunorreguladores. Objetivo: Avaliar o efeito de um programa de treinamento físico aeróbio na inflamação sistêmica e pulmonar, no controle clinico e fatores de saúde relacionados à qualidade de vida controle clínico de pacientes adultos com asma persistente moderada ou grave. Métodos: Foram estudados 58 adultos asmáticos divididos aleatoriamente nos grupos controle (GC; n=28) e treinado (GT; n=30) e 16 indivíduos não asmáticos (GNA). Os pacientes do GC foram submetidos a um programa educacional e a um programa de exercícios respiratórios, enquanto os pacientes do GT foram submetidos a todos os procedimentos do grupo controle e a um programa de condicionamento físico aeróbio. A resposta imune foi avaliação pelo perfil plasmático das citocinas Th1 (fator de necrose tumoral, interleucina-6 (IL-6), IL-8), Th2 (IL-4, IL- 5), regulatórias (IL-10) e quimiocinas (MCP-1, IP-10, MIG, RANTES) tanto cronicamente como após uma sessão de exercício. Antes e após a intervenção todos os pacientes realizaram uma prova de função pulmonar...

Efeito do treinamento físico aeróbio na hiperresponsividade brônquica e no processo inflamatório pulmonar  de pacientes com asma moderada a grave; Effect of aerobic training on bronchial hyperresponsiveness and pulmonary inflammation in patients with moderate to severe asthma

França Pinto, Andrezza
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 27/05/2014 Português
Relevância na Pesquisa
36.21%
Introdução: A asma é caracterizada por um processo inflamatório crônico que está associado ao desenvolvimento da hiperresponsividade brônquica (HRB). O exercício físico regular proporciona inúmeros benefícios aos pacientes com asma porém, os efeitos do treinamento físico na HRB permanecem pouco compreendidos. Objetivo: Avaliar o efeito do treinamento físico aeróbio na hiperresponsividade brônquica, inflamação pulmonar, controle clínico e fatores relacionados à qualidade de vida de pacientes adultos com asma persistente moderada a grave. Métodos: Cinquenta e oito adultos com asma moderada a grave foram divididos aleatoriamente, em dois grupos: Controle (GC, n=28) e Treinado (GT, n=30). Os pacientes do GC foram submetidos a um programa educacional e a um programa de exercícios respiratórios, enquanto os pacientes do GT foram submetidos a todos os procedimentos do GC e a um programa de condicionamento físico aeróbio. A hiperresponsividade brônquica foi avaliada através do teste de broncoprovocação inespecífica com histamina antes e após a intervenção. Nestas ocasiões, todos os pacientes também realizaram, análise do escarro induzido e da fração exalada de óxido nítrico, espirometria, teste ergoespirométrico e responderam aos questionários de controle clínico...

Efeitos de um programa de treinamento físico na capacidade física, broncoespasmo induzido pelo exercício e qualidade de vida de crianças com asma persistente moderada e grave; Effects of a physical training program on physical capacity, exercise-induced bronchoconstriction and quality of life of children with moderate and severe persistent asthma

Galvani, Adriana Fanelli
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 30/08/2004 Português
Relevância na Pesquisa
36.19%
A maioria das crianças asmáticas apresenta dispnéia ao realizar exercícios, fazendo com que elas evitem a prática esportiva e apresentem uma redução no condicionamento físico. Isto, por sua vez, restringe a sua independência física e emocional, podendo, assim, deteriorar a sua qualidade de vida. Em vista disto, o presente estudo tem por objetivo avaliar: a capacidade física, a broncoconstrição induzida pelo exercício, a qualidade de vida e a ingesta de medicamentos. Foram estudadas 38 crianças, de ambos os sexos, divididas em dois grupos: um composto de crianças com asma moderada/grave corticóide dependentes, submetidas a um programa de educação (grupo controle), e o outro constituído de crianças, de mesmas características, submetidas a um programa de educação e a um outro de treinamento físico (grupo treinado). O programa educacional para crianças e pais ou responsáveis teve duração total de quatro horas, distribuídas em duas sessões de duas horas cada. Antes do período educacional, elas foram clinicadas e medicadas por um pneumologista que adequou o tratamento medicamentoso até estabilizar o quadro clínico dos pacientes. Foram avaliados: a performance aeróbica avaliada pelo teste ergoespirométrico...

VO2 Kinetics During Heavy and Severe Exercise in Swimming

Pessoa Filho, D. M.; Alves, F. B.; Reis, J. F.; Greco, C. C.; Denadai, B. S.
Fonte: Georg Thieme Verlag Kg Publicador: Georg Thieme Verlag Kg
Tipo: Artigo de Revista Científica Formato: 744-748
Português
Relevância na Pesquisa
46.12%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); The purpose of this study was to describe the VO2 kinetics above and below respiratory compensation point (RCP) during swimming. After determination of the gas-exchange threshold (GET), RCP and VO2max, 9 well-trained swimmers (21.0 +/- 7.1 year, VO2max = 57.9 +/- 5.1 ml. kg(-1).min(-1)), completed a series of "square-wave" swimming transitions to a speed corresponding to 2.5% below (S-2.5%) and 2.5% above (S+2.5%) the speed observed at RCP for the determination of pulmonary VO2 kinetics. The trial below (similar to 2.7%) and above RCP (similar to 2%) was performed at 1.28 +/- 0.05 m.s(-1) (76.5 +/- 6.3% VO2max) and 1.34 0.05 m.s(-1) (91.3 +/- 4.0% VO2max) respectively. The time constant of the primary component was not different between the trials below (17.8 +/- 5.9 s) and above RCP (16.5 +/- 5.1 s). The amplitude of the VO2 slow component was similar between the exercise intensities performed around RCP (S-2.5% = 329.2 +/- 152.6 ml.min(-1) vs. S+2.5% = 313.7 +/- 285.2 ml.min(-1)), but VO2max was attained only during trial performed above RCP (S-2.5% = 91.4 +/- 5.9% VO2max vs. S+2.5% = 103.0 +/- 8.2% VO2max). Thus...

Effects of aerobic endurance training status and specificity on oxygen uptake kinetics during maximal exercise

Caputo, F.; Denadai, B.
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica Formato: 87-95
Português
Relevância na Pesquisa
46.07%
The main purpose of this study was to analyze the effects of exercise mode, training status and specificity on the oxygen uptake ((V)over dot O-2) kinetics during maximal exercise performed in treadmill running and cycle ergometry. Seven runners (R), nine cyclists (C), nine triathletes (T) and eleven untrained subjects (U), performed the following tests on different days on a motorized treadmill and on a cycle ergometer: (1) incremental tests in order to determine the maximal oxygen uptake ((V)over dot O-2max) and the intensity associated with the achievement of (V)over dot O-2max (I(V)over dot O-2max); and (2) constant work-rate running and cycling exercises to exhaustion at I(V)over dot O-2max to determine the effective time constant of the (V)over dot O-2 response (tau(V)over dot O-2). Values for (V)over dotO(2max) obtained on the treadmill and cycle ergometer [R=68.8 (6.3) and 62.0 (5.0); C=60.5 (8.0) and 67.6 (7.6); T=64.5 (4.8) and 61.0 (4.1); U=43.5 (7.0) and 36.7 (5.6); respectively] were higher for the group with specific training in the modality. The U group showed the lowest values for VO2max, regardless of exercise mode. Differences in tau(V)over dot O-2 (seconds) were found only for the U group in relation to the trained groups [R=31.6 (10.5) and 40.9 (13.6); C=28.5 (5.8) and 32.7 (5.7); T=32.5 (5.6) and 40.7 (7.5); U=52.7 (8.5) and 62.2 (15.3); for the treadmill and cycle ergometer...

Influência da música no estado de ânimo e no desempenho em exercícios

Nakamura, Priscila Missaki
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: xviii, 124 f. : il., gráfs., tabs.
Português
Relevância na Pesquisa
46.26%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Pós-graduação em Ciências da Motricidade - IBRC; É bem conhecida a influência da música no desempenho do exercício no domínio moderado e nos estados de ânimo. Poucos estudos investigaram essa relação em exercícios no domínio intenso e severo. Além disso, a audição de música é bastante disseminada entre praticantes de atividade física, os quais devem selecionar músicas de acordo com suas preferências pessoais. Entretanto, a relação entre a preferência musical e o desempenho e o estado de ânimo não está esclarecido. Desse modo, dois estudos foram propostos. O objetivo do estudo 1 foi de verificar a influência da audição da música preferida e não preferida no desempenho, nas respostas fisiológicas, na percepção subjetiva de esforço (PSE) e nos estados de ânimo em exercícios no domínio severo no cicloergômetro. O objetivo do estudo 2 foi de verificar a influência da audição da música preferida e não preferidas nas mesmas variáveis do estudo 1 em exercícios no domínio intenso no cicolergômetro. No primeiro estudo foram determinados os parâmetros da Potência Crítica (PCrit) em diferentes protocolos, Música Preferida (MP)...

Four weeks of blood flow restricted training increases time to exhaustion at severe intensity cycling exercise

Corvino,Rogério Bulhões; Oliveira,Mariana Fernandes Mendes de; Santos,Rafael Penteado dos; Denadai,Benedito Sérgio; Caputo,Fabrizio
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2014 Português
Relevância na Pesquisa
46.32%
The present study aimed to verify the effects of 4 weeks of low-intensity blood flow restricted (BFR) training on time to exhaustion (Tlim) at severe-intensity exercise. Thirteen physically active subjects (23 ± 3.4 years; 70.6 ± 7.8 kg; 170.9 ± 10 cm) were assigned to one of two groups: low-intensity interval training with (BFR, n=9) or without (CON, n=4) blood flow restricted. The interval training sessions consisted of 2 sets of 5-8 × 2-min intervals at 30% of peak power output (Ppeak) obtained during incremental exercise for LOW and BFR, separated by 1min of rest. For BFR a cuff was inflated (140-200mmHg) during the exercise bouts and deflated during rest intervals. The pressure was increased 20mmHg after three completed sessions, thus, in the last week the pressure applied was 200mmHg. Before and after 4 weeks intervention period, all subjects completed an incremental exercise until exhaustion and one-step transition to a severe-intensity work rate (110%Ppeak). The results revealed that BFR (Pre: 227 ± 44s vs. Post: 338 ± 76s), but not CON (Pre: 236 ± 24s vs. Post: 212 ± 26s), increase significantly Tlim at 110%Ppeak. It can be concluded that 4 weeks of BFR training, but not CON, increased the exercise tolerance at severe intensity domain. Therefore...

The peripheral vascular response to severe exercise in untethered dogs before and after complete heart block

Vatner, Stephen F.; Higgins, Charles B.; White, Saxon; Patrick, Thomas; Franklin, Dean
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /09/1971 Português
Relevância na Pesquisa
46.19%
The peripheral vascular response to severe exercise was studied in 11 healthy conscious dogs instrumented with Doppler ultrasonic flow probes on the mesenteric, renal, and iliac arteries, and miniature pressure gauges in the aorta. The response to severe exercise was restudied in six of these dogs after recovery from a second operation producing complete heart block by the injection of formalin into the atrioventricular (AV) node. Three of these dogs also exercised while their ventricles were paced at rates of 100/min and 200/min. The untethered normal dogs ran at speeds of 15-25 miles/hr behind a mobile recording unit for a distance averaging 1.5 miles, while continuous measurements of arterial blood pressure and blood flow were telemetered and recorded on magnetic tape. Severe exercise in normal dogs increased heart rate from 84 to 259/min, arterial pressure from 89 to 140 mm Hg, flow resistance in the mesenteric and renal beds by 59 and 52% respectively, and iliac blood flow 479% above control, while mesenteric and renal blood flows remained constant and iliac resistance decreased by 73%.

Left Ventricular Response to Severe Exertion in Untethered Dogs

Vatner, Stephen F.; Franklin, Dean; Higgins, Charles B.; Patrick, Thomas; Braunwald, Eugene
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /12/1972 Português
Relevância na Pesquisa
36.27%
The left ventricular response to severe exercise was studied by telemetering direct measurements of left ventricular diameter (D) and pressure (P) and aortic blood flow from healthy dogs running at speeds up to 30 mph in the field. Severe exercise increased cardiac output from 101 to 478 ml/kg per min, heart rate from 95 to 297 beats/min, stroke volume from 31 to 44 ml, left ventricular isolength (iso) systolic pressure from 120 to 186 mm Hg, left ventricular end diastolic pressure from 6 to 18 mm Hg, and left ventricular end diastolic diameter from 58.9 to 60.1 mm, while end systolic diameter decreased from 53.0 to 52.2 mm. Two indices of myocardial contractility, (dP/dt)/P increased from 37 to 92 sec−1, while dD/dt, the velocity of myocardial fiber shortening at isolength, rose from 54 to 119 mm/sec. All of these changes were statistically significant. When, in resting dogs, heart rate was first raised to exercise levels by electrical stimulation, severe exercise subsequently increased left ventricular end diastolic diameter more profoundly, from 55.7 to 59.7 mm, while end systolic diameter remained constant and the increases in left ventricular pressure, (dP/dt)/P and velocityiso were roughly comparable to those occurring during exercise in spontaneous rhythm. After propranolol...

Severe Exercise and Exercise Training Exert Opposite Effects on Human Neutrophil Apoptosis via Altering the Redox Status

Syu, Guan-Da; Chen, Hsiun-ing; Jen, Chauying J.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 09/09/2011 Português
Relevância na Pesquisa
46.16%
Neutrophil spontaneous apoptosis, a process crucial for immune regulation, is mainly controlled by alterations in reactive oxygen species (ROS) and mitochondria integrity. Exercise has been proposed to be a physiological way to modulate immunity; while acute severe exercise (ASE) usually impedes immunity, chronic moderate exercise (CME) improves it. This study aimed to investigate whether and how ASE and CME oppositely regulate human neutrophil apoptosis. Thirteen sedentary young males underwent an initial ASE and were subsequently divided into exercise and control groups. The exercise group (n = 8) underwent 2 months of CME followed by 2 months of detraining. Additional ASE paradigms were performed at the end of each month. Neutrophils were isolated from blood specimens drawn at rest and immediately after each ASE for assaying neutrophil spontaneous apoptosis (annexin-V binding on the outer surface) along with redox-related parameters and mitochondria-related parameters. Our results showed that i) the initial ASE immediately increased the oxidative stress (cytosolic ROS and glutathione oxidation), and sequentially accelerated the reduction of mitochondrial membrane potential, the surface binding of annexin-V, and the generation of mitochondrial ROS; ii) CME upregulated glutathione level...

Sensibilidade interoceptiva e respostas psicofisiológicas ao exercício submaximo

Farias Junior, Luiz Fernando de
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Educação Física; Movimento Humano, Cultura e Educação, Saúde e Desempenho Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Educação Física; Movimento Humano, Cultura e Educação, Saúde e Desempenho
Tipo: Dissertação Formato: application/pdf
Português
Relevância na Pesquisa
36.2%
The complex human behavior related to exercise involves cognitive, physical and emotional processing. The recent theories about exercise s intensity regulation have highlighted the role played by psychophysics aspects in controlling exercise s intensity. In this regard, recent evidences have shown that there is variability in human capacity in perceiving interoceptives clues. Thus, subjects more sensitive show higher physiological arousal to physical and/or emotional stress, and sensations with higher intensity. In fact, studies have evidenced that interoceptive feedback modifies behavior in exercise with free load. However, exercise recommendations are based in a constant load standard. Therefore, we aimed to analyze the influence of interoceptive sensibility on psychophysics responses during dynamic exercise performed with constant load. Twenty-four adult males were allocated into two groups accordingly with their interoceptive sensibility: high sensibility (n=11) and low sensibility (13). They underwent to an incremental test (IT) and then randomly to two sections of moderate and severe exercise intensity for 20 minutes. Heart rate (HR), rating of perceived exertion (RPE), affective feelings (AF), alert state (AS), and percentage of associative thoughts were collect during exercise. A two-way ANOVA with repeated measures was used to assess differences between psychophysics responses. There were differences between group in RPE...

Investigation of the incidence and type of injuries associated with high-speed treadmill exercise testing

Franklin, S.; Barakzai, S.; Courouce-Malblanc, A.; Dixon, P.; Nankervis, K.; Perkins, J.; Roberts, C.; Vanerck-Westergren, E.; Allen, K.
Fonte: Equine Veterinary Journal Ltd Publicador: Equine Veterinary Journal Ltd
Tipo: Artigo de Revista Científica
Publicado em //2010 Português
Relevância na Pesquisa
46.22%
REASONS FOR PERFORMING STUDY: During the past 20 years, treadmill exercise testing has played an important role in both the study of equine exercise physiology and the investigation of poor athletic performance. However, it has been suggested that some trainers and veterinarians may be reluctant to refer horses for treadmill exercise testing because of fears that horses may be at increased risk of musculoskeletal injury during treadmill exercise. OBJECTIVE: To investigate the incidence and types of injuries sustained by horses undergoing treadmill exercise. METHODS: Data were collated from 9 centres in the UK, France and Belgium, and the prevalence and types of injury were established. RESULTS: A total of 2305 records were reviewed, with 2258 horses performing treadmill exercise. There was an overall injury rate of 5.4%. However, the majority of injuries sustained were minor in nature (4.7%). Only 13 horses (0.6%) sustained major injuries in association with treadmill exercise. These included 5 cases of severe exercise-induced myopathy, 4 fractures (of which 1 was catastrophic), 2 tendon injuries, 1 case with undiagnosed severe lameness and 1 with marked exacerbation of a previously diagnosed lameness. Two other major incidents were reported but were not directly associated with treadmill exercise (one had iliac thrombosis and one collapsed and died as a result of a pulmonary embolism). CONCLUSIONS: This study confirms that the majority of horses undergo treadmill exercise without incident. The majority of injuries that did occur were minor in nature and the incidence of major injuries was similar to that reported during competition elsewhere. POTENTIAL RELEVANCE: Treadmill exercise is a safe procedure and does not appear to pose an increased risk of injury in comparison with overground exercise.; S. H. Franklin...

The slope of the VO2 slow component is associated with exercise intolerance during severe-intensity exercise

Barbosa, L. F.; Greco, C. C.; Denadai, B. S.
Fonte: Akademiai Kiado Rt Publicador: Akademiai Kiado Rt
Tipo: Artigo de Revista Científica Formato: 517-523
Português
Relevância na Pesquisa
36.21%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); The aim of this study was to analyze the relationship between the slope of the VO2 slow component (VO(2)sc) and exercise tolerance (tlim) during constant-work-rate (CWR) exercise performed within the severe intensity domain. Fifteen active subjects (VO(2)max - 41.2 +/- 5.1 ml.kg(-1).min(-1)) performed the following tests: 1) an incremental test to determine the VO(2)max and the work rate associated with the VO(2)max (IVO(2)max) and; 2) two CWR transitions at 95% of the IVO(2)max to determine the slope of the VO2 slow component and the tlim. Three tlims were obtained: tlim1 = CWR1; tlim2 = CWR2; and tlim1+ 2 = (CWR1 + CWR2) / 2. There was no significant difference between the VO(2)max (3271.7 +/- 410.7 mL.min(-1)) and VO(2)peak obtained during the CWR tests (CWR1 = 3356.3 +/- 448.8 mL.min(-1), CWR2 = 3362.2 +/- 393.4 mL.min(-1), p > 0.05). Significant correlations (p < 0.05) were found among the VO(2)sc kinetics and tlim1 (r = -0.53), tlim2 (r = -0.49) and tlim1+2 (r = -0.55). Thus, exercise tolerance during CWR performed within the severe intensity domain is partially explained by the slope of the VO2 slow component.

Four weeks of blood flow restricted training increases time to exhaustion at severe intensity cycling exercise; Quatro semanas de treinamento com restrição de fluxo sanguíneo aumenta o tempo de exaustão em exercício severo no ciclismo

Corvino, Rogério Bulhões; State University of Santa Catarina; Oliveira, Mariana Fernandes Mendes de; State University of Santa Catarina. Federal University of Santa Catarina.; Santos, Rafael Penteado dos; State University of Santa Catarina; Denadai, Ben
Fonte: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil Publicador: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; "Avaliado por Pares",; Original paper; Avaliado por Pares; Artigos Originais Formato: application/pdf
Publicado em 01/08/2014 Português
Relevância na Pesquisa
46.32%
http://dx.doi.org/10.5007/1980-0037.2014v16n5p570 The present study aimed to verify the effects of 4 weeks of low-intensity blood flow restricted (BFR) training on time to exhaustion (Tlim) at severe-intensity exercise. Thirteen physically active subjects (23 ± 3.4 years; 70.6 ± 7.8 kg; 170.9 ± 10 cm) were assigned to one of two groups: low-intensity interval training with (BFR, n=9) or without (CON, n=4) blood flow restricted. The interval training sessions consisted of 2 sets of 5-8 × 2-min intervals at 30% of peak power output (Ppeak) obtained during incremental exercise for LOW and BFR, separated by 1min of rest. For BFR a cuff was inflated (140-200mmHg) during the exercise bouts and deflated during rest intervals. The pressure was increased 20mmHg after three completed sessions, thus, in the last week the pressure applied was 200mmHg. Before and after 4 weeks intervention period, all subjects completed an incremental exercise until exhaustion and one-step transition to a severe-intensity work rate (110%Ppeak). The results revealed that BFR (Pre: 227 ± 44s vs. Post: 338 ± 76s), but not CON (Pre: 236 ± 24s vs. Post: 212 ± 26s), increase significantly Tlim at 110%Ppeak. It can be concluded that 4 weeks of BFR training, but not CON...

Oxygen consumption in the severe exercise intensity domain during incremental and square-wave test modes; Consumo de oxigênio no domínio de intensidade severo durante teste incremental e retangular

Moura, Rodrigo Ferreira de; UNESP - Rio Claro; Kokubun, Eduardo; UNESP - Rio Claro
Fonte: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil Publicador: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; "Avaliado por Pares",; ; Avaliado por Pares Formato: application/pdf; application/pdf
Publicado em 18/07/2008 Português
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45.97%
http://dx.doi.org/10.5007/1980-0037.2008v10n3p289Incremental tests are commonly used to predict metabolic responses during square-wave mode exercises. However, in some cases the predicted and observed results may be not similar. Main objective: To verify the hypothesis that, at certain intensities in the severe domain, VO2 determined during the incremental test is lower than that observed at these workloads using the square-wave test. Methodological proceedings: Eight physically active males (21.5 ± 4 years, 73.7 ± 5.3 kg and 180.8 ± 4.1 cm) performed: 1) an incremental test on cycle ergometer to determine the VO2 of the intensities (VO2INC); 2) a square-wave test at three severe intensities (Light (L), Medium (M) and Heavy (H)) to determine the critical power (CP) and to compare the VO2 (VO2RET) observed with the VO2INC; 3) a square-wave test at CP intensity to compare the time response of VO2 with P, M and L, at four different sample times. Results: The VO2INC at L intensity underestimated the VO2RET (3.2 ± 0.5 vs. 3.8 ± 0.6 l.min-1). No differences were observed at the other intensities (M: 3.5 ± 0.5 vs. 3.6 ± 0.5 l.min-1; H: 3.7 ± 0.5 vs. 3.4 ± 0.6 l.min-1; CP: 2.7 ± 0.5 vs. 3.0 ± 0.6 l.min-1). The VO2 at CP was lower at all times...

Effects of previous severe exercise on two and three parameter critical power modeling; Efeito do exercício prévio severo no modelo de potência crítica de dois e três parâmetros

Nakamura, Fabio Yuzo; Universidade Estadual de Londrina; Massaru Okuno, Nilo; Universidade Estadual de Londrina; Ferreira Infante Rosa, Camila; Universidade Estadual de Londrina; Serpeloni Cyrino, Edilson; Universidade Estadual de Londrina; Simões, Herbe
Fonte: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil Publicador: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; "Avaliado por Pares",; Avaliado por Pares; Descritiva Formato: application/pdf; application/pdf
Publicado em 05/09/2007 Português
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56.26%
The purpose of this study was to apply the two and three-parameter critical power model equations after depletion of a fi xed amount of anaerobic work capacity (AWC), followed by a short rest period. Sixteen subjects underwent: (1) two practice trials for ergometer familiarization to severe exercise; (2) 4-5 exercise bouts on different days for the estimation of critical power (CP) and AWC using the two and three parameter models; (3) the same procedures as described in stage 2 were repeated after 30 s recovery from 180 s of exercise completed at an intensity that would have elicited exhaustion in around 300 s. The CP2parameter (130-174 W versus 131-170 W) and CP3parameter (108 versus 100 W) estimated after prior severe exercise followed by a short rest period remained stable compared to the fatigue-free tests. The AWC2parameter was reduced in response to prior severe exercise. The AWC3parameter was not signifi cantly reduced. The correlations between CP2parameter derived from the same equation with and without prior AWC2parameter reduction were strong (r = 0.97-0.99, P < 0.001). The correlation was merely moderate (r = 0.62, P = 0.01) when CP3parameter was analyzed. It can be concluded that the two-parameter critical power model provides a coherent mathematical description of the reduced mechanical output induced by a prior fatiguing task...

DNA damage induced by exercise in middle gluteal muscle of thoroughbreds horses

Boffi,FM; Muriel,MG; López,RA; Ferreira,V; Seoane,A; Picco,SJ
Fonte: BAG. Journal of basic and applied genetics Publicador: BAG. Journal of basic and applied genetics
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2007 Português
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It is well known that two classical consequences of severe exercise are soreness and stiffness. Both consequences develop in the days following severe exercise. The objective of the present work was to establish the association between DNA damage, the energetic metabolism and the effects of the generation of oxygen free radicals in middle gluteal muscle of horses, measured after a severe exercise bout on a treadmill. Four thoroughbreds, ranging in aged from 3 to 4 years old were used for this study. The test consisted in warming-up, severe exercise, and cooling down. Venous blood samples were withdrawn via a catheter from the jugular vein before and at 5 min, 30 min, 45 min and 24 h post-exercise. Muscle biopsy samples were obtained from the middle gluteal muscle before and at 45 min and 24 h after exercise. All statistical analyses were performed using Student's t-tests for unpaired data. ATP concentration significantly decreased (p< .05) after 45 min of severe exercise and subsequently increased by 24 h. Plasma CK activity increased significantly (p< .05) after 45 min and 24 h of exercise. Both free MDA and protein-bound MDA concentrations significantly increased (p< .001) after 45 min of exercise, and both of them returned almost to the pre-exercise values after 24 h of exercise. The percentage of TUNEL positive cells increased significantly (p< .001) so as the plasma hypoxanthine and uric acid level during exercise. It was strongly suggested that the generation of free radicals was developed during exercise. The mechanism of exercise-induced myopathy could be the cell membrane damage by lipid peroxidation and DNA fragmentation in the working muscle cells by free radicals generation.