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12. Effects of 4 Weeks of β-Alanine Supplementation on Swim-Performance Parameters in Water Polo Players.

Author

Pinheiro Brisola, Gabriel Motta, Milioni, Fabio, Papoti, Marcelo, and Moura Zagatto, Alessandro

Subjects
ALANINE, AQUATIC sports, CONFIDENCE intervals, EXERCISE tests, HEALTH outcome assessment, PLACEBOS, ERGOGENIC aids, BODY movement, RANDOMIZED controlled trials, BLIND experiment
Abstract

To investigate whether 4 wk of β-alanine supplementation enhances parameters related to water polo performance. Methods Twenty-two highly trained male water polo players of national level were randomly assigned to receive 28 d of either β-alanine or a placebo (4.8 g/d of the supplement in the first 10 d and 6.4 g/d in the final 18 d). The participants performed 30-s maximal tethered swimming (30TS), 200-m swimming (P200m), and 30-s crossbar jumps (30CJ) before and after the supplementation period. Results The β-alanine group presented significant increases in 30TS for mean force (P = .04; Δ = 30.5% ± 40.4%) and integral of force (P = .05; Δ = 28.0% ± 38.0%), as well as P200m (P = .05; Δ = -2.2% ± 2.6%), while the placebo group did not significantly differ for mean force (P = .13; Δ = 24.1% ± 33.7%), integral of force (P = .12; Δ = 24.3% ± 35.1%), or P200m (P = .10; Δ = -1.6% ± 3.8%). However, there was no significant group effect for any variable, and the magnitude-based-inference analysis showed unclear outcomes between groups (Cohen d ± 95%CL mean force = 0.16 ± 0.83, integral of force = 0.12 ± 0.84, and P200m = 0.05 ± 0.30). For 30CJ the results were similar, with improvements in both groups (placebo, Δ = 14.9% ± 14.1%; β-alanine, Δ = 16.9% ± 18.5%) but with no significant interaction effect between groups and an unclear effect (0.14 ± 0.75). Conclusion Four weeks of β-alanine supplementation does not substantially improve performance of 30TS, P200m, or 30CJ in highly trained water polo athletes compared with a control group. [ABSTRACT FROM AUTHOR]

Published
2017
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16. Influence of β-alanine supplementation associated with high-intensity interval training in the repeated sprints performance

Author

Milioni, Fabio, Universidade Estadual Paulista (Unesp), and Zagatto, Alessandro Moura [UNESP]

Subjects
β-Alanine, Acid-base balance, β-Alanina, Carnosine, Fadiga muscular, Carnosina, Equilíbrio ácido-base, Muscle fatigue
Abstract

Submitted by FABIO MILIONI (fmilioni@yahoo.com.br) on 2018-10-02T18:52:19Z No. of bitstreams: 1 Tese Doutorado Final.pdf: 5513111 bytes, checksum: 185eb55afcd55e67724ab68aa2e03ab4 (MD5) Rejected by Lucilene Cordeiro da Silva Messias null (lubiblio@bauru.unesp.br), reason: Solicitamos que realize uma nova submissão seguindo as orientações abaixo: 1 - Favor inserir a ficha catalográfica no corpo do texto, pois é um item obrigatório. Agradecemos a compreensão on 2018-10-03T13:15:00Z (GMT) Submitted by FABIO MILIONI (fmilioni@yahoo.com.br) on 2018-10-03T14:12:34Z No. of bitstreams: 1 Tese Doutorado - Fabio Milioni.pdf: 5835160 bytes, checksum: d954dcaaa0c0bc020baceb52b0107786 (MD5) Approved for entry into archive by Lucilene Cordeiro da Silva Messias null (lubiblio@bauru.unesp.br) on 2018-10-03T17:15:10Z (GMT) No. of bitstreams: 1 milioni_f_dr_bauru.pdf: 5480525 bytes, checksum: 6ac2fa2e539201d14af3503b4de493a1 (MD5) Made available in DSpace on 2018-10-03T17:15:10Z (GMT). No. of bitstreams: 1 milioni_f_dr_bauru.pdf: 5480525 bytes, checksum: 6ac2fa2e539201d14af3503b4de493a1 (MD5) Previous issue date: 2018-08-20 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) O objetivo da presente tese foi verificar a influência da suplementação de β-Alanina associado ao treinamento intervalado de alta intensidade (HIIT) na performance de sprints repetidos. Participaram do estudo conduzido em caráter randomizado e duplo-cego, 20 jovens saudáveis alocados em dois grupos (Gβ [n = 10] – 6,4 g.dia-1 de β-Alanina; GP [n = 10] – 6,4 g.dia-1 de dextrose - placebo). Os participantes foram avaliados em três momentos distintos, previamente ao início, após quatro semanas de HIIT sem suplementação e após 6 semanas de suplementação + HIIT. As avaliações foram compostas por teste incremental até exaustão (TINC); séries de 12 sprints repetidos (RSA); e teste de tempo limite até exaustão a 115% da velocidade máxima atingida no TINC (TLIM). Previamente e imediatamente após TINC e RSA foram realizadas avaliações neuromusculares compostas por saltos verticais máximos, contrações isométricas máximas de extensão de joelho e estimulação elétrica periférica. O HIIT foi composto de dez corridas de 1 min a 90% da velocidade máxima atingida no TINC, com 1 min de recuperação passiva entre as corridas e frequência de 3 sessões semanais. Previamente ao início da suplementação + HIIT e ao final da intervenção, os participantes foram submetidos a biópsias musculares para determinação do conteúdo de carnosina intramuscular, capacidade de tamponamento in vitro e conteúdo de proteínas/enzimas chaves. Após a intervenção, ambos os grupos melhoraram o metabolismo oxidativo (i.e., consumo máximo de oxigênio), entretanto, somente o Gβ melhorou significativamente o conteúdo de carnosina intramuscular e as variáveis do RSA além de apresentar atenuação da fadiga neuromuscular induzida pelo RSA. Não foram verificadas diferenças significativas na capacidade anaeróbia, capacidade de tamponamento in vitro e conteúdo de proteínas/enzimas chaves. Dessa forma, a associação entre suplementação de β-Alanina e HIIT proporcionou melhora significativa do desempenho de sprints repetidos. The aim of the present thesis was to verify the influence of β-Alanine supplementation associated with high intensity interval training (HIIT) on the performance of repeated sprints. The study was conducted in a randomized, double-blind design and 20 healthy young men were allocated in two groups (Gβ [n = 10] - 6.4 g.day-1 of β-Alanine; GP [n = 10] - 6.4 g.day-1 of dextrose – placebo). The participants were evaluated at three different moments, prior to beginning, after four weeks of HIIT without supplementation and after 6 weeks of supplementation + HIIT. The evaluations were composed by incremental test until exhaustion (TINC); set of 12 repeated sprints (RSA); and time-to-exhaustion test at 115% of the maximum velocity achieved in TINC (TLIM). Previously and immediately after TINC and RSA, neuromuscular evaluations were performed, consisting of maximum vertical jumps, maximal voluntary isometric contractions of knee extension and peripheral electrical stimulation. The HIIT was composed by ten runs of 1-min at 90% of the maximum velocity achieved in TINC, with 1-min of passive recovery between runs and frequency of 3 sessions per week. Prior to the initiation of supplementation + HIIT and at the end of the intervention, the participants underwent muscle biopsies to determine intramuscular carnosine content, muscle buffer capacity in vitro and key protein/enzyme content. After the intervention, both groups improved oxidative metabolism (i.e., maximal oxygen uptake), however, only Gβ significantly improved the intramuscular carnosine content and the RSA variables; in addition to presenting attenuation of the neuromuscular fatigue induced by the RSA. No significant differences were observed in anaerobic capacity, muscle buffer capacity in vitro and key protein/enzyme content. Thus, the association between β-Alanine supplementation and HIIT provided significant improvement in repeated sprints performance. 2016/02683-6

Published
2018

18. Dynamic Changes of Performance Fatigability and Muscular O2 Saturation in a 4-km Cycling Time Trial.

Author

AZEVEDO, RAFAEL A., MILIONI, FABIO, MURIAS, JUAN M., BERTUZZI, ROMULO, and MILLET, GUILLAUME Y.

Subjects
*SKELETAL muscle physiology, *ISOMETRIC exercise, *CYCLING, *EXERCISE, *FATIGUE (Physiology), *MUSCLE contraction, *OXYGEN in the body, *BODY movement, *DESCRIPTIVE statistics
Abstract

Exercise intensity variations throughout a cycling time trial (TT) might be influenced by subject's functional state. Purpose: The current study characterized the performance fatigability etiology, immediately after exercise cessation, and its relation to the dynamic changes in muscle O2 saturation (SmO2) at different TT phases. Methods: Twelve males performed three separated TT of different distances, in a crossover counterbalanced design, until the end of the fast-start (FS, 827 ± 135 m), even-pace (EP, 3590 ± 66 m), or end-spurt (ES, 4000 m) TT phases. Performance fatigability was characterized by using isometric maximal voluntary contractions (IMVC), whereas the maximal voluntary activation (VA) and contractile function of knee extensors (e.g., peak torque of potentiated twitches [TwPt]) were evaluated using electrically evoked contractions performed before and immediately after each exercise bouts. SmO2, power output (PO), and EMG were also recorded. Results: Immediately after the FS phase, there were lower values for IMVC (−23%), VA (−8%), and TwPt (−43%) (all P < 0.001), but no further changes were measured after EP (IMVC, −28%; VA, −8%; TwPt, −38%). After the ES phase, IMVC (−34%) and TwPt (−59%) further decreased compared with the previous phases (P < 0.05). There were lower SmO2 and higher EMG/PO values during FS and ES compared with EP phase. Conclusion: FS and EP phases had similar performance fatigability etiology, but ES showed further impairments in contractile function. This later finding might be due to the abrupt changes in SmO2 and EMG/PO because of the high exercise intensity during the ES, which elicited maximal decline in contractile function at the finish line. [ABSTRACT FROM AUTHOR]

Published
2021
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19. Time Course of Recovery after Cycling Repeated Sprints.

Author

MILIONI, FABIO, AZEVEDO, RAFAEL A., ZAGATTO, ALESSANDRO M., and MILLET, GUILLAUME Y.

Subjects
*MUSCLE fatigue, *COOLDOWN, *NEUROPHYSIOLOGY, *NEUROMUSCULAR system, *CYCLING, *KNEE joint, *BODY movement, *SPRINTING, *TIME, *MUSCLE contraction, *RANGE of motion of joints
Abstract

Purpose: The present study investigated the recovery of performance and neuromuscular fatigue after cycling repeated sprints. Methods: Ten participants performed two sessions of repeated sprints (one session: 10 × 10-s sprints, 30-s recovery) separated by 24 h (R24-S1 and R24-S2) and two sessions separated by 48 h (R48-S1 and R48-S2). The recovery condition (i.e., 24 or 48 h) was randomized and separated by 1 wk. All sessions were performed on a recumbent bike, allowing minimal delay between sprints termination and neuromuscular measurements. Neuromuscular function of knee extensors (neuromuscular assessment [NMA]) was assessed before sessions (presession), after the fifth sprint (midsession), and immediately after (postsession). Before sessions, baseline NMA was also carried out on an isometric chair. The NMA (bike and chair) was composed of maximal voluntary contraction (MVC) of knee extension and peripheral neuromuscular stimulation during the MVC and on relaxed muscle. Results: The sprints performance was not significantly different between sessions and did not presented significant interaction between recovery conditions. MVC was significantly lower at R24-S2 compared with R24-S1 (−6.5% ± 8.8%, P = 0.038) and R48-S2 (−5.6% ± 8.2%, P = 0.048), whereas resting potentiated high-frequency doublet (Db100) was lower at R24-S2 compared with R24-S1 (−10.4 ± 8.3, P = 0.01) (NMA on chair). There were significant reductions in MVC (>30%, P < 0.001) and Db100 (>38%, P < 0.001) from pre- to postsession in all sessions, without significant interactions between recovery conditions (NMA on bike). Conclusion: Cycling repeated sprints induce significant fatigue, particularly at the peripheral level, which is fully restored after 48 h, but not 24 h, of recovery. One versus two days of recovery does not affect neuromuscular fatigue appearance during cycling repeated-sprint sessions. [ABSTRACT FROM AUTHOR]

Published
2021
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20. Periodized Training in Mice: Comparisons between Constant and Undulating Load Models.

Author

Dellavechia de Carvalho, Carlos, Kalva-Filho, Carlos Augusto, Milioni, Fabio, Paulo Loures, João, Siqueira Serrano, Vitor, Ramos Silva, Adelino Sanchez, and Papoti, Marcelo

Subjects
ANAEROBIC threshold, MICE
Abstract

The purpose of this study was to compare the effects of undulating (UL) and constant load (CL) training models applied in Swiss mice. Twenty male mice were divided into 3 groups: (a) Control Group [CON; n=6]; (b) Undulating Group [ULG; n=7]; and (c) Constant Load Group [CLG; n=7]. Both training periods lasted 8 wks, 5 d·wk-1, as prescribed in accordance with maximal speed reached during the incremental test (MaxS). The ULG trained through sessions classified as Endurance 1 (60 min at 40% MaxS), Endurance 2 (30 min at 60% MaxS), Endurance 3 (4 x 5 min at 100% MaxS), and Anaerobic (10 x 1 min at 120% MaxS). All sessions for CLG consisted of a 60-min duration at 60% of MaxS. Both training models induced positive adaptations until the 4th wk of training. However, these adaptations were not maintained during the last 4 wks, declining MaxS in relation to baseline. The CLG was able to accomplish only 69% of proposed training volume. However, the ULG was able to accomplish 94% of the proposed volume. Comparing the reasons for sessions failure, CLG presented higher number of dropouts related to unsatisfactory running (P-value = 0.008) and exhaustion (P-value = 0.001), while the ULG quit the sessions mainly due to injuries (P-value = 0.003). These results demonstrate that independently of the training model used, positive adaptations were induced up to the 4th-wk of training with high intensity sessions producing the larger amount of dropouts due primarily to injuries. [ABSTRACT FROM AUTHOR]

Published
2020

27. Futsal match-related fatigue affects running performance and neuromuscular parameters but not finishing kick speed or accuracy

Author

Milioni, Fabio, Vieira, Luiz H P, Barbieri, Ricardo A, Zagatto, Alessandro M, Nordsborg, Nikolai Baastrup, Barbieri, Fabio A, Dos-Santos, Júlio W, Santiago, Paulo R P, Papoti, Marcelo, Milioni, Fabio, Vieira, Luiz H P, Barbieri, Ricardo A, Zagatto, Alessandro M, Nordsborg, Nikolai Baastrup, Barbieri, Fabio A, Dos-Santos, Júlio W, Santiago, Paulo R P, and Papoti, Marcelo

Abstract

Purpose: The aim of the present study was to investigate the influence of futsal match-related fatigue on running performance, neuromuscular variables, and finishing kick speed and accuracy. Methods: Ten professional futsal players participated in the study (age: 22.2 ± 2.5 years) and initially performed an incremental protocol to determine maximum oxygen uptake ([Formula: see text]: 50.6 ± 4.9 mL.kg(-1).min(-1)). Next, simulated games were performed, in four periods of 10 min during which heart rate and blood lactate concentration were monitored. The entire games were video recorded for subsequent automatic tracking. Before and immediately after the simulated game, neuromuscular function was measured by maximal isometric force of knee extension, voluntary activation using twitch interpolation technique, and electromyographic activity. Before, at half time, and immediately after the simulated game, the athletes also performed a set of finishing kicks for ball speed and accuracy measurements. Results: Total distance covered (1st half: 1986.6 ± 74.4 m; 2nd half: 1856.0 ± 129.7 m, P = 0.00) and distance covered per minute (1st half: 103.2 ± 4.4 m.min(-1); 2nd half: 96.4 ± 7.5 m.min(-1), P = 0.00) demonstrated significant declines during the simulated game, as well as maximal isometric force of knee extension (Before: 840.2 ± 66.2 N; After: 751.6 ± 114.3 N, P = 0.04) and voluntary activation (Before: 85.9 ± 7.5%; After: 74.1 ± 12.3%, P = 0.04), however ball speed and accuracy during the finishing kicks were not significantly affected. Conclusion: Therefore, we conclude that despite the decline in running performance and neuromuscular variables presenting an important manifestation of central fatigue, this condition apparently does not affect the speed and accuracy of finishing kicks.

Published
2016

28. Associações entre, índices fisiológicos e fadiga neuromuscular com padrões de deslocamento e desempenho do chute de finalização no futsal

Author

Milioni, Fabio [UNESP], Universidade Estadual Paulista (Unesp), Papoti, Marcelo [UNESP], and Santiago, Paulo Roberto Pereira [UNESP]

Subjects
Transmissão neuromuscular, Fadiga, Aptidão física do atleta, Jogadores de futebol, Fisiologia, Capacidade aeróbia, Futebol de salão, Biomecânica, Fisiology
Abstract

Made available in DSpace on 2014-08-13T14:50:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-03-31Bitstream added on 2014-08-13T18:00:03Z : No. of bitstreams: 1 000767464.pdf: 1967408 bytes, checksum: 8a93f2d4e4bb98001a0c9acb86203057 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) O objetivo do presente estudo foi investigar as possíveis associações entre parâmetros fisiológicos e neuromusculares, com padrões de deslocamento e o desempenho do chute de finalização no futsal. Para isso foram realizados 3 estudos. Nos estudos 1 e 2, atletas amadores de futsal realizaram o Running Anaerobic Sprint Test (RAST) e o Protocolo de Lactato Mínimo. Em diferentes dias participaram de dois jogos de futsal simulados. Durante os jogos as concentrações sanguíneas de lactato ([Lac]), percepção subjetiva de esforço (PSE) e frequência cardíaca (FC) foram monitoradas, e as simulações filmadas para posterior rastreamento do deslocamento dos jogadores. No estudo 3, atletas profissionais de futsal realizaram teste incremental para a determinação do limiar anaeróbio e consumo máximo de oxigênio. Em seguida foram realizados três jogos simulados monitorados quanto à [Lac] e FC e filmados integralmente para posterior rastreamento do deslocamento dos jogadores. Os parâmetros neuromusculares foram avaliados por meio da eletromiografia de superfície, contrações isométricas voluntárias máximas e da utilização da técnica de Twitch Interpolation. Para análise estatística foram utilizados testes t de Student para amostras dependentes, análise de variância ANOVA - one way, além de Correlações de Pearson para verificação de possíveis associações entre as diversas variáveis investigadas. O nível de significância foi assumido como 95% em todos os casos. Foram verificadas associações positivas dos índices aeróbios, com o desempenho durante sprints repetidos, contribuição energética do sistema alático e variáveis provenientes do rastreamento e apesar de queda significativa da performance dos padrões de deslocamento e dos parâmetros neuromusculares, não foi verificado diminuição do desempenho dos chutes de finalização. Tais resultados evidenciam a necessidade de desenvolvimento do sistema aeróbio... The aim of the present study was to investigate possible associations between physiological and neuromuscular parameters with time-motion patterns and performance of shooting in futsal. Three studies were performed. In studies 1 and 2, amateur futsal athletes performed the Running Anaerobic Sprint Test (RAST) and the lactate minimum protocol. On different days participated in two simulated games of futsal. During the games the blood lactate concentrations ([Lac]), perceived exertion (RPE) and heart rate (HR) were monitored and recorded for subsequent tracking of time-motion players. In study 3, professional futsal athletes performed an incremental test for determining the anaerobic threshold and maximal oxygen uptake. Then was performed three simulated games monitored for [Lac] and HR and recorded entirely for later tracking of the time-motion players. Neuromuscular parameters were evaluated by surface electromyography, maximal isometric voluntary contractions and the Twitch Interpolation Technique. For statistical analysis were used Student's t test for dependent samples, ANOVA - one way and Pearson’s correlation test to investigate possible associations between the variables investigated. The significance level was assumed as 95% in all cases. Were verified positive associations of aerobic indexes, with the performance during repeated sprints, the energy contribution of alactic system and variables from the tracking, despite a significant drop in performance of time-motion analysis and neuromuscular parameters, has not been verified decrease in performance of the finishing kicks. These results highlight the need for development of the aerobic system for amateur futsal players to mitigate the drop in performance, however it is likely that for higher level players, neuromuscular factors are determinants during intermittent high-intensity efforts. Furthermore, the fall of neuromuscular performance, although it affects the time-motion...

Published
2014

32. Preliminary results on organization on the court, physical and technical performance of Brazilian professional futsal players: comparison between friendly pre-season and official match

Author

Vieira, Luiz Henrique Palucci, primary, Doğramaci, Sera N., additional, Barbieri, Ricardo Augusto, additional, Milioni, Fabio, additional, Moura, Felipe Arruda, additional, Andrade, Vitor Luiz de, additional, Cesar, Guilherme Manna, additional, and Santiago, Paulo Roberto Pereira, additional

Published
2016
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35. Efeito das cargas de treinamento sobre parâmetros fisiológicos de futebolistas

Author

Campos, Eduardo Zapaterra, Milioni, Fabio, Zanuto, Everton Alex Carvalho, Almeida, Pablo Barreto, Gobbi, Ronaldo Bucken, Andrade, Vitor Luiz de, Balikian Junior, Pedro, Papoti, Marcelo, Universidade Estadual Paulista (UNESP), and Universidade de São Paulo (USP)

Subjects
Treinamento, Anaerobic Threshold, Soccer, Training, Futebol, Limiar Anaeróbio
Abstract

O objetivo desse estudo foi verificar os efeitos de três semanas de treinamentos com intensidades monitoradas sobre a capacidade aeróbia de futebolistas profissionais. Quatorze futebolistas integrantes de equipe da primeira divisão do Campeonato Brasileiro de 2010, foram avaliados pré e pós três semanas de treinamento. O limiar anaeróbio (LAn) foi determinado pelo método bi-segmentado, para isso quatro esforços submáximos de 800 metros com intensidades de 10, 12, 14 e 16 km/h foram aplicados. Trinta três sessões de treinamentos foram quantificadas em zonas de acordo com frequência cardíaca referente ao LAn (FC LAn): Z1 - 10% abaixo, Z2 - 90-100% e Z3 - acima da FC LAn. Durante os treinamentos os jogadores permaneceram 31,17±14,86%, 42,96±14,90% e 25,87±16,67% em Z1, Z2 e Z3, respectivamente. Não foram encontradas diferenças significativas no LAn (pré = 13,29 ± 0,71 km∙h-1; pós=12,85 ± 0,90 km∙h-1), percepção subjetiva de esforço correspondente ao LAn (pré = 11,53 ± 1,45 u.a; pós=11,23 ± 1,53 u.a) e FC LAn (pré = 166,64 ± 10,69 bpm; pós = 174,50 ± 10,89 bpm), indicando que três semanas de treinamento são insuficiente para gerar adaptações positivas no LAn de futebolistas. The aim of this study was to investigate the effects of three weeks of training with intensity monitored on the aerobic capacity of professional soccer players. Fourteen players, members of a first division Brazilian Championship team in 2010, aged 22.78 ± 3.06 years were evaluated pre and post three weeks of training. The anaerobic threshold intensity LAn was determined by bi-segmented method, for this four submaximal efforts of 800 meters with intensities 10, 12, 14 and 16 km/h were applied. Thirty three training sessions were quantified in zones according to heart rate related to the LAn (FC LAn): Z1 - 10% below, Z2 - 90-100% and Z3 - above the FC LAn. During training participants remained 31.17 ± 14.86%, 42.96% and 25.87 ± 14.90 ± 16.67% in Z1, Z2, and Z3 respectively. There were no significant differences in the LAn (pre = 13,29 ± 0,71 km∙h-1; post = 12,85 ± 0,90 km∙h-1), perceived exertion (pre = 11,53 ± 1,45 u.a; post = 11,23 ± 1,53 u.a) and FC LAn (pre = 166,64 ± 10,69 bpm; post = 174,50 ± 10,89 bpm) between conditions before and after training, indicating that three weeks of training are insufficient to generate positive changes in soccer players LAn.

Published
2013

38. Energy Systems Contribution in the Running-based Anaerobic Sprint Test.

Author

Milioni, Fabio, Moura Zagatto, Alessandro, Barbieri, Ricardo Augusto, Andrade, Vitor Luiz, Dos Santos, Julio Wilson, Gobatto, Claudio Alexandre, Da Silva, Adelino S. R., Pereira Santiago, Paulo Roberto, and Papoti, Marcelo

Subjects
*ENERGY metabolism, *EXERCISE physiology, *GLYCOGEN, *LACTATES, *OXIDATION-reduction reaction, *PHOSPHORYLATION, *PROBABILITY theory, *RUNNING, *STATISTICAL significance, *COOLDOWN, *BODY movement, *OXYGEN consumption, *EXERCISE intensity, *DESCRIPTIVE statistics
Abstract

The aims of the present study were to verify the contributions of the energy systems during repeated sprints with a short recovery time and the associations of the time- and power-performance of repeated sprints with energetic contributions and aerobic and anaerobic variables. 13 healthy men performed the running-based anaerobic sprint test (RAST) followed by an incremental protocol for lactate minimum intensity determination. During the RAST, the net energy system was estimated using the oxygen consumption and the blood lactate responses. The relative contributions of oxidative phosphorylation, glycolytic, and phosphagen pathways were 38, 34, and 28 %, respectively. The contribution of the oxidative pathway increased significantly during RAST especially from the third sprint, at the same time that power- and time-performances decreases significantly. The phosphagen pathway was associated with power-performance (peak power = 432 ± 107 W, r = 0.65; mean power = 325 ± 80 W, r = 0.65; minimum power =241 ±77 W, r = 0.57; force impulse= 1 846±478N-s, r = 0.74; p<0.05). The time-performance (total time = 37.9 ± 2.5 s; best time = 5.7 ± 0.4 s; mean time = 6.3 ± 0.4 s; worst time = 7.0 ± 0.6 s) was significantly correlated with the oxidative phosphorylation pathway (0.57 < r > 0.65; p < 0.05) and glycolytic pathway (0.57 < r > 0.58; p < 0.05). The oxidative pathway appears to play an important role in better recovery between sprints, and the continued use of the glycolytic metabolic pathway seems to decrease sprint performances. Finally, the phosphagen pathway was linked to power production/maintenance. [ABSTRACT FROM AUTHOR]

Published
2017
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43. Tracking futsal players with a wide-angle lens camera: accuracy analysis of the radial distortion correction based on an improved Hough transform algorithm

Author

Vieira, Luiz H. P., Pagnoca, Emilio A., Milioni, Fabio, Barbieri, Ricardo A., Menezes, Rafael P., Alvarez, Luis, Déniz, Luis G., Santana-Cedrés, Daniel, and Santiago, Paulo R. P.

Abstract

AbstractThe aim of this study was to assess the applicability and reliability of a single wide-angle lens GoPro®camera for tracking and kinematics analysis of futsal players. An official game of a Brazilian professional team in the quarter-final round of the 2013 São Paulo futsal league was recorded by four digital video cameras (30 Hz; 720 × 480) placed at the highest points of the court (40 × 20 m; FIFA standard). We compared tracking performed with three cameras equipped with conventional lenses to a GoPro®camera with a wide-angle lens with a 170° field of view. Manual and automatic tracking of players trajectories (n = 5; 23.20 ± 2.39 years) during competition and in a controlled environment were performed. We found that the root-mean-square error calculated to determine the position on the court based on images captured with a GoPro®camera was 0.32 m and for the velocity was 0.71 m s−1. A 5-min excerpt of the game showed an average difference of 2.11% between the total distance covered obtained by tracking with the GoPro®with radial distortion correction (438.97 ± 164.65 m), and cameras with conventional lenses (449.54 ± 170.92 m). Temporal correlation analysis confirmed the great similarity between the reconstructed trajectories obtained by these cameras (r = 0.99 for movements on both xand yaxes). We showed that a single GoPro®Hero3+ can provide reliable kinematic analysis of computational tracking based on videogrammetry for futsal, using the Hough transform and division model technique for radial distortion correction.

Published
2017
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44. Five Weeks of Sprint Interval Training Improve Muscle Glycolytic Content and Activity But Not Time to Task Failure in Severe-Intensity Exercise.

Author

Araujo Bonetti DE Poli R, Murias JM, Antunes BM, Marinari G, Dutra YM, Milioni F, and Zagatto AM

Subjects
Humans, Male, Young Adult, L-Lactate Dehydrogenase metabolism, Glycogen Phosphorylase metabolism, Adult, Glycogen metabolism, Muscle, Skeletal metabolism, Muscle, Skeletal physiology, High-Intensity Interval Training methods, Glycolysis physiology, Phosphofructokinases metabolism, Hexokinase metabolism
Abstract

Purpose: This study examined the impact of a 5-wk sprint interval training (SIT) intervention on time to task failure (TTF) during severe-intensity constant work rate (CWR) exercise, as well as in glycolytic enzymatic content and activity, and glycogen content., Methods: Fourteen active males were randomized into either a SIT group ( n = 8) composed of 15 SIT sessions over 5 wk, or a control group ( n = 6). At pretraining period, participants performed i) ramp incremental test to measure the cardiorespiratory function; ii) CWR cycling TTF at 150% of the power output (PO) at the respiratory compensation point (RCP-PO) with muscle biopsies at rest and immediately following task failure. After 5 wk, the same evaluations were repeated (i.e., exercise intensities matched to current training status), and an additional cycling CWR matched to pretraining 150% RCP-PO was performed only for TTF evaluation. The content and enzymatic activity of glycogen phosphorylase (GPhos), hexokinase (HK), phosphofructokinase (PFK), and lactate dehydrogenase (LDH), as well as the glycogen content, were analyzed. Content of monocarboxylate transporter isoform 4 (MCT4) and muscle buffering capacity were also measured., Results: Despite improvements in total work performed at CWR posttraining, no differences were observed for TTF. The GPhos, HK, PFK, and LDH content and activity, and glycogen content also improved after training only in the SIT group. Furthermore, the MCT4 concentrations and muscle buffering capacity were also improved only for the SIT group. However, no difference in glycogen depletion was observed between groups and time., Conclusions: Five weeks of SIT improved the glycolytic pathway parameters and total work performed; however, glycogen depletion was not altered during CWR severe-intensity exercise, and TTF remained similar., (Copyright © 2024 by the American College of Sports Medicine.)

Published
2024
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