RESUMO
The aim of this study was to determine the effect of endurance training individually guided by objective (Heart Rate Variability-HRV) or self-report measure of stress (DALDA-questionnaire) in comparison to predefined endurance training prescription for improving endurance performance in recreational runners. After a 2-week preliminary baseline period to establish resting HRV and self-reported measure of stress, thirty-six male recreational runners were randomly assigned to HRV-guided (GHRV; n = 12), DALDA-guided (GD; n = 12) or predefined training (GT; n = 12) prescription groups. Before and after 5-weeks of endurance training, participants performed a track field peak velocity (Vpeak_TF), time limit (Tlim) at 100% of Vpeak_TF and 5 km time-trial (5 km TT) tests. GD lead to higher improvements in Vpeak_TF (8.4 ± 1.8%; ES = 1.41) and 5 km TT (-12.8 ± 4.2%; ES = -1.97), than GHRV (6.6 ± 1.5% and -8.3 ± 2.8%; ES = -1.20; 1.24) and GT (4.9 ± 1.5% and -6.0 ± 3.3%; ES = -0.82; 0.68), respectively, with no differences for Tlim. Self-report measures of stress may be used to individualize endurance training prescription on a daily basis leading to better performance enhancement, which may be used with HRV for a holistic understanding of daily training-induce adaptations.
Assuntos
Treino Aeróbico , Resistência Física , Humanos , Masculino , Teste de Esforço , Frequência Cardíaca/fisiologia , Resistência Física/fisiologia , AutorrelatoRESUMO
This study aimed to examine which variable, between the peak running velocity determined on the track field (V peak_TF) and critical speed (CS), is the best predictor of the 5-km running performance in recreational runners. Twenty-five males performed three tests to determine the V peak_TF, CS, and 5-km running performance on the track field, with a minimal interval of 48 h between each test. The V peak _TF protocol started with a velocity of 8 kmâ h-1, followed by an increase of 1 kmâ h-1 every 3 min until volitional exhaustion, which was controlled by sound signals, with cones at every 25 m indicating when the participants were required to pass the cone's position to maintain the required velocity. The participants performed three time trials (TTs) (1: 2,600 m; 2: 1,800 m; and 3: 1,000 m) on the same day, with a 30-min rest period to determine the CS through the combinations of three (CS1,2,3) and two TTs (CS1,2, CS1,3, and CS2,3). The 5-km running performance time was recorded to determine the test duration, and the mean velocity (MV) was calculated. There was a significant difference observed between the V peak_TF and the MV 5-km running performance. However, no differences were found between the CS values and the MV 5-km running performance. A correlation was observed between the V peak_TF (R = -0.90), CS1,2,3 (R = -0.95), CS1,3 (R = -0.95), and the 5-km running performance time. Linear regression indicated that the V peak_TF (R 2 = 0.82), CS1,2,3 (R 2 = 0.90), and CS1,3 (R 2 = 0.90) significantly predicted the 5-km running performance time. The CS results showed a higher predictive power for the 5-km running performance, slightly better than the V peak_TF. Also, CS1,2,3 and the CS1,3 presented the highest predictive power for the 5-km running performance of recreational runners.
RESUMO
The purpose of this study was to investigate the effects of chronic beetroot juice (BRJ) supplementation on 10-km running performance in recreational runners. In a double-blind, placebo-controlled, crossover-designed study, 14 male recreational runners (age, 27.8 ± 3.4 years) performed three 10-km running tests, at baseline and under the conditions of BRJ supplementation and placebo (PLA). Supplementation was administered for 3 days, and on the days of the assessments, the ingestion occurred 2 h before the test and consisted of a dose of 420 mL of BRJ in natura (8.4 mmol inorganic nitrate (NO3-)·day-1) or PLA with depleted NO3- (0.01 mmol NO3-·day-1). The mean velocity (MV) was calculated, and the following variables were determined: maximal heart rate, maximal rating of perceived exertion, blood glucose concentration (analyzed before and after the test), and lactate peak. There was no main effect between conditions regarding 10-km running time performance (BRJ: 50.1 ± 5.3 min; PLA: 51.0 ± 5.1 min; P = 0.391) and total MV (BRJ: 12.1 ± 1.3 km·h-1; PLA: 11.9 ± 1.2 km·h-1; P = 0.321) or in the other analyzed variables. The time to complete the first half of the test (5 km) was statistically lower in the BRJ group than in the PLA group (P = 0.027). In conclusion, chronic supplementation with BRJ increased MV in the first half of the test and improved the final test times of 10 of the 14 runners, although we did not find a statistically significant difference in the performance of the 10-km run.
Assuntos
Beta vulgaris , Suplementos Nutricionais , Sucos de Frutas e Vegetais , Contração Muscular , Músculo Esquelético/fisiologia , Resistência Física , Raízes de Plantas , Corrida , Administração Oral , Adulto , Biomarcadores/sangue , Glicemia/metabolismo , Brasil , Estudos Cross-Over , Método Duplo-Cego , Frequência Cardíaca , Humanos , Ácido Láctico/sangue , Masculino , Fatores de Tempo , Adulto JovemRESUMO
RESUMO: a inclusão de alunos com deficiência é prevista em lei e manter boas estruturas físicas e pedagógicas na escola é um ponto fundamental para que o acesso possa acontecer. A Educação Física faz parte desta inclusão e pode proporcionar grandes melhoras na qualidade de vida de alunos com deficiência. Este estudo teve como objetivo compreender as percepções do aluno com deficiência a respeito das aulas de Educação Física. Para isso foi realizada uma pesquisa de natureza qualitativa utilizando para coleta de dados uma entrevista semiestruturada a qual foi gravada, transcrita e posteriormente analisada. A amostra foi constituída de 20 alunos com deficiência matriculados em escolas regulares da cidade de Santos Dumont - MG. A partir das entrevistas, destacou-se a percepção do aluno com deficiência a respeito da Educação Física escolar; o entendimento deles quanto ao conceito de qualidade de vida; as melhoras proporcionadas na qualidade de vida através da Educação Física; as facilidades e as dificuldades nas aulas; e as questões concernentes à relação aluno/professor e aluno/aluno. Os resultados dessa pesquisa podem auxiliar a comunidade escolar e o professor de Educação Física a melhorarem a inclusão nas escolas regulares. Além disso, as percepções dos alunos com deficiência sobre as aulas podem ajudar o professor na busca de um ambiente melhor com aulas que atendam a todos e proporcionem uma melhor qualidade de vida.
ABSTRACT: The inclusion of disabled students is based on the law and the adaptation of physical and pedagogical structure at school represents a key point in order to make the access happen. Physical education is a part of the social inclusion and can provide great improvements in quality of life of students with disabilities. This research aimed to verify the perception of the student with disabilities on physical education classes. Therefore, a qualitative research was carried out, using a semi structured interview to collect data. The interviews were recorded, transcribed and analyzed. The sample was constituted by 20 students with disabilities enrolled in general schools at Santos Dumont, Minas Gerais. From the interviews, we highlighted the perceptions of students with disabilities on physical education at school; their understanding about the concept of quality of life; the improvements provided in the quality of life through physical education; successes and difficulties in class; and issues concerning the relationship student/ teacher and student/student. The results of this research can help the educational community and the physical education teacher to improve the quality of inclusion in general schools. In addition, perceptions of students with disabilities about the lessons can help the teacher in the search for a better environment with classes that meet everyone's needs and provide a better of quality of life.