Menstrual cycle alters training strain,monotony, and technical training length in young     

Gislaine Cristina-Souza  Ana C. Santos-Mariano  Carla C. Souza-Rodrigues  Raul Osiecki  Sandro F. Silva  Adriano E. Lima-Silva 《Journal of sports sciences》2019,37(16):1824-1830

The menstrual cycle (MC) phases carry to several psychophysiological alterations; however, no study has investigated the impact of MC phases on training load or technical training. In the present study, we investigated the effect of the follicular phase (FP), ovulatory phase (OP), and luteal phase (LP) on training load and technical training in young athletes. Twelve female athletes performed regular daily training sessions with the rating of perceived exertion (RPE) and duration being registered every session. Training impulse (TRIMP), monotony and strain were calculated. MC symptoms, RPE, and duration were also measured during technical training, which was carried out on a specific day during each phase. The TRIMP was not affected by MC phases during regular training (p > .05), but training monotony and strain were higher in FP compared to OP (p < .05). During the technical training, MC phases did not affect RPE (p > .05), but the session was longer in both FP and LP, compared to OP (p < .05). MC symptoms were exacerbated in FP compared to both OP and LP (p < .05). These findings suggest that MC disorders were elevated during FP, which indicate that monitoring MC phases might provide important feedbacks for programming training and expected results during competitions.  相似文献   

Acute and chronic effect of sodium bicarbonate ingestion on Wingate test performance: a systematic review and meta-analysis     

João Paulo Lopes-Silva  Reid Reale  Emerson Franchini 《Journal of sports sciences》2019,37(7):762-771

The aim of this study was to perform a systematic review and meta-analysis on the acute and chronic effects of sodium bicarbonate (NaHCO₃) ingestion on Wingate performance. Following a search through PubMed, Scopus and Web of Science, 9 studies were found meeting inclusion criteria (6 acute and 3 chronic). Random-effects meta-analysis of standardized mean difference (SMD) for peak and mean power was performed. Study quality was assessed using the QualSyst. Results of the meta-analysis showed that acute ingestion of NaHCO₃ did not improve Wingate test peak (weighted average effect size Hedges’s g = 0.02, 95%CI: – 0.19 to 0.23, P = 0.87) or mean power (weighted average effect size Hedges’s g = 0.15, 95%CI: ?0.06 to 0.36, P = 0.92). However, chronic ingestion of NaHCO₃ improved Wingate test peak (weighted average effect size Hedges’s g = 1.21, 95%CI: 0.83 to 1.42, P = 0.001) and mean power (weighted average effect size Hedges’s g = 1.26, 95%CI: 0.96 to 1.56, P = 0.001). Quality assessment of selected articles was classified as strong. This meta-analysis provides evidence that chronic, but not acute, ingestion of NaHCO₃ increases both Wingate test peak and mean power.  相似文献   

Predicting centre of mass horizontal speed in low to severe swimming intensities with linear and non-linear models     

Kelly de Jesus  Helon Vicente Hultmann Ayala  Leandro dos Santos Coelho  João Paulo Vilas-Boas  Ricardo Jorge Pinto Fernandes 《Journal of sports sciences》2019,37(13):1512-1520

We aimed to compare multilayer perceptron (MLP) neural networks, radial basis function neural networks (RBF) and linear models (LM) accuracy to predict the centre of mass (CM) horizontal speed at low-moderate, heavy and severe swimming intensities using physiological and biomechanical dataset. Ten trained male swimmers completed a 7 × 200 m front crawl protocol (0.05 m.s^?1 increments and 30 s intervals) to assess expiratory gases and blood lactate concentrations. Two surface and four underwater cameras recorded independent images subsequently processed focusing a three-dimensional reconstruction of two upper limb cycles at 25 and 175 m laps. Eight physiological and 13 biomechanical variables were inputted to predict CM horizontal speed. MLP, RBF and LM were implemented with the Levenberg-Marquardt algorithm (feed forward with a six-neuron hidden layer), orthogonal least squares algorithm and decomposition of matrices. MLP revealed higher prediction error than LM at low-moderate intensity (2.43 ± 1.44 and 1.67 ± 0.60%), MLP and RBF depicted lower mean absolute percentage errors than LM at heavy intensity (2.45 ± 1.61, 1.82 ± 0.92 and 3.72 ± 1.67%) and RBF neural networks registered lower errors than MLP and LM at severe intensity (2.78 ± 0.96, 3.89 ± 1.78 and 4.47 ± 2.36%). Artificial neural networks are suitable for speed model-fit at heavy and severe swimming intensities when considering physiological and biomechanical background.  相似文献   

Concurrent Validity and Reliability of Alternative Computer Game for the Coincidence-Anticipation Timing Task     

Tânia Brusque Crocetta  Regiani Guarnieri  Thaís Massetti  Talita Dias da Silva  Renata Thaís de Almeida Barbosa  Jennifer Yohanna Ferreira de Lima Antão 《Measurement in physical education and exercise science》2019,23(2):169-185

The coincidence-anticipation timing (CAT) task assesses one facet of cognitive and motor performance and is used to understand the human visuo-motor system involved in intercepting the moving object. To assess the test–retest reliability and the concurrent validity in the Bridge Games package (Bridge) developed to assess the CAT task, the scores of 224 healthy subjects (M = 52.2, SD = 19.5 years old) were measured using the Bridge and the ‘gold standard’ Bassin Anticipation Timer (Bassin). A mean block of absolute, constant, and variable errors was calculated. Reliability and validity were expressed using intraclass correlation coefficients (ICC_2,k), standard error of measurement, minimal detectable change, and Pearson’s correlation. Reliability was good to excellent for all blocks (.73 ≤ ICC ≤ .88), and the validity was good to excellent when compared using Pearson’s correlation coefficient, suggesting that the two tests may have similar properties. Bridge is an alternative to existing clinical tests for the CAT task.  相似文献   

Resistance training prescription with different load-management methods improves phase angle in older women     

Alex S. Ribeiro  Brad J. Schoenfeld  Mariana F. Souza  Crisieli M. Tomeleri  Analiza M. Silva  Denílson C. Teixeira 《European Journal of Sport Science》2017,17(7):913-921

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Hydroethanolic Extract of Grape Peel from Vitis labrusca Winemaking Waste: Antinociceptive and Anti-Inflammatory Activities     

Cristiana F. G. Silva  Victor Fattori  Caroline R. Tonetti  Marcos A. S. Ribeiro  Ricardo L. N. Matos  Jssica B. Carra  Eduardo C. Meurer  Elisa Y. Hirooka  Janice A. Rafael  Sandra R. Georgetti  Marcela M. Baracat  Waldiceu A. Verri  Jr  Nilton S. Arakawa 《Food Technology and Biotechnology》2022,60(1):21

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Learning through chemistry simulations: an analysis of cognitive skill levels     

da Silva  Renan Amorim  de Vasconcelos  Flávia Cristina Gomes Catunda 《Education and Information Technologies》2022,27(5):6967-6987

Education and Information Technologies - This paper presents an analysis of cognitive skill levels expressed in high school students’ performance using laboratory simulations. We address...  相似文献   

Improving OER descriptions to enhance their availability,reuse, and enrichment     

Herrera-Cubides  Jhon Francined  Gaona-Garc&#;a  Paulo Alonso  Montenegro-Mar&#;n  Carlos Enrique  S&#;nchez-Alonso  Salvador 《Education and Information Technologies》2022,27(2):1811-1839

Education and Information Technologies - Nowadays, information and communication technologies (ICTs) and virtual training have increased the use of educational resources. This growth use has...  相似文献   

Correction to: Teaching and learning in a multilingual Europe: findings from a cross-European study     

Dockrell  J. E.  Papadopoulos  T. C.  Mifsud  C. L.  Bourke  L.  Vilageliu  O.  Bešić  E.  Seifert  S.  Gasteiger-Klicpera  B.  Ralli  A.  Dimakos  I.  Karpava  S.  Martins  M.  Sousa  O.  Castro  S.  Knudsen  H. B. Søndergaard  Donau  P.  Haznedar  B.  Mikulajová  M.  Gerdzhikova  N. 《European Journal of Psychology of Education - EJPE》2022,37(2):321-323

European Journal of Psychology of Education - A Correction to this paper has been published: https://doi.org/10.1007/s10212-021-00539-z  相似文献   

Lessons from the famous 17th-century paradox of the Chevalier de Méré     

José Daniel López-Barrientos  Eliud Silva  Enrique Lemus-Rodríguez 《Teaching Statistics》2023,45(1):36-44

We take advantage of a combinatorial misconception and the famous paradox of the Chevalier de Méré to present the multiplication rule for independent events; the principle of inclusion and exclusion in the presence of disjoint events; the median of a discrete-type random variable, and a confidence interval for a large sample. Moreover, we pay tribute to our original bibliographic sources by providing two computational tools to facilitate the students' insights on these topics.  相似文献