Commentaries on Viewpoint: Physiology and fast marathons Santos-Concejero, Jordan; González-Mohíno, Fernando; González-Ravé, José María ...
Journal of applied physiology (1985),
04/2020, Volume:
128, Issue:
4
Journal Article
O objetivo deste estudo foi investigar os efeitos do estresse termico no desempenho de corrida de jogadores profissionais de futebol. Os dados de desempenho da corrida foram monitorados em vinte e ...tres jogadores da categoria masculina durante o Campeonato Brasileiro de Futebol, Serie B - 2021. Os resultados mostram que as distancias totais percorridas nos jogos, distancias percorridas em sprint (> 25,2 km/h), numero de sprints, numero de acoes em alta aceleracao (2,5-6,0 m/s.sup.2) e alta desaceleracao (-2,5 a -6 m/s.sup.2), assim como PlayerLoad, nao sofreram alteracoes significativas se comparado as condicoes de estresse termico baixo vs. moderado vs. alto. Por outro lado, os jogadores percorreram menores distancias totais em alta (i.e., 14,4-19,8 km/h) e muito alta velocidade (i.e., 19,8-25,2 km/h) em jogos realizados sob condicoes de estresse termico alto e moderado em comparacao abaixo. Diante disto, podemos concluir que os jogadores tendem a exercer menores esforcos fisicos de corrida em alta velocidade quando jogam em contexto de alto e moderado estresse termico. Portanto, a comissao tecnica pode definir estrategias para aumentar a capacidade fisica dos jogadores para enfrentar estes jogos ou organizar a equipe para que a reducao das distancias percorridas nao seja prejudicial ao estilo de jogo da equipe. Palavras-chave: GPS. Desempenho fisico. Fator contextual. Ciencia do esporte. The aim of this study was to investigate the effects of heat stress on the running performance of professional football players. Running performance data were monitored in twenty-three male players during the 2021 Brazilian Football Championship, Serie B. The results show that the total distances covered in games, distances covered in sprints (> 25.2 km/h), number of sprints, number of actions with high acceleration (2.5-6.0 m/s.sup.2), high deceleration (-2.5 to -6 m/s.sup.2), as well as PlayerLoad, did not undergo significant changes when comparing low vs. moderate vs. high heat stress conditions. On the other hand, players covered lower total distances at high (i.e., 14.4-19.8 km/h) and very high speed (i.e., 19.8-25.2 km/h) in games played under high and moderate heat stress conditions compared to low heat stress. We can conclude that players tend to exert less physical effort in high-speed running when playing in high and moderate heat-stress conditions. Therefore, the coaching staff can devise strategies to enhance the players' physical capacity to cope with these games or organize the team in a way that the reduction in distances covered does not negatively impact the team's playing style. Key words: GPS. Physical performance. Contextual factors. Sport science.
En los últimos años ha habido un gran aumento de práctica de deportes de resistencia como la carrera de fondo, practicada mayormente por adultos de entre 35 y 55 años. La mayoría de esta población no ...ha realizado práctica deportiva anterior y se enfrenta a este deporte sin la prescripción adecuada, exponiéndose a diversos riesgos para su salud. El objetivo de este estudio es analizar el perfil sociodemográfico del corredor veterano, así como los beneficios y los riesgos de esta práctica deportiva. Cerca del 50% de los corredores sufren lesiones todos los años, en muchos casos asociadas al volumen de entrenamiento. Otros riesgos de naturaleza cardiovascular como la fibrilación auricular pueden estar relacionados con los años de entrenamiento y competición de alta intensidad. También, la carrera de resistencia puede exponer a los corredores a riesgos psicosociales como la adicción negativa el deporte. Aunque siempre los beneficios de este deporte superan los riesgos. Tanto la determinación del estado de salud previo como la adecuada prescripción del entrenamiento son dos elementos esenciales en la gestión de los riesgos a los que se ven expuestos los corredores veteranos.
Palabras Clave: Corredores, veteranos, riesgos, resistencia.
Abstract. In recent years there has been a great increase in the practice of endurance sports such as long-distance running, cycling, triathlon, etc., practiced mainly by adults between 35 and 55 years of age. The majority of this population has not practiced sports before and is associated with habits that are harmful to health. They face this practice without any prior study and if prescribed by professionals, this being a risk with undesirable consequences. In this article, the profile of this type of brokers and their characteristics, benefits and risks are determined. Competition should be an expendable consequence of the love of endurance running as an instrument to improve health, however, when competition is the cause of adherence to this sport, the runner may be exposed to risks even in the psychosocial.
Keywords: Runners, veterans, risk, endurance.
Letter to the editor Mooses, Martin; Mooses, Kerli; Haile, Diresibachew W ...
Journal of sports sciences,
01/2016, Volume:
34, Issue:
1
Journal Article
Peer reviewed
Santos-Concejero and Tucker argued in their letter to the editor that in our study the running economy in achieving superior performance was overlooked due to some methodological aspects. Having ...given the remarks of Santos-Concejero and Tucker appropriate consideration, in this letter to the editor, we argue that our paper does not downplay the influence of running economy on the determinants of the East African running phenomenon, but rather adds novel insights into the interaction between running economy, maximal oxygen uptake and performance.
The article is addressing the problem of running technique as a major factor of improving running performance. A short retrospective review showed that the main obstacle in developing a proper and ...efficient running technique was the absence of a commonly accepted concept, model of the efficient running technique, which, in its turn, did not allow the development of an efficient method of teaching. The author, based on his own studies in this field, is proposing a very specific way of solving this problem by using gravity as the major source of running movement with the rest of the factors just assisting it.
Off-road running continues to grow in popularity, with differing event categories existing, and terminologies are often used interchangeably and without precision. Trail running, mountain running, ...skyrunning, fell running, orienteering, obstacle course racing and cross-country running all take place predominantly in off-road terrain. Ultramarathon running refers to any running event over marathon distance conducted in any terrain and surface. Although some overlap may exist between these running events, mainly through the common denominator of off-road terrain, distinct features need to be recognised. As scientific interest in these activities grows, it becomes important to clarify these terms and develop a universal language for discussing these events. Similarly, off-road running athletes are generally not properly defined within the scientific literature, which makes intra- and inter-study comparisons difficult. The current position statement of the Ultra Sports Science Foundation highlights the different off-road running events and recommends clear reference to distance, surface, elevation change and altitude, type of event (continuous vs. staged), type of support, name and year of the event, governing body, and guidance on terminology. We further recommend to describe off-road running athletes by basic data, physiological determinants, training and competition characteristics in the scientific literature in order to facilitate and guide further research and practice.
Category:
Sports
Introduction/Purpose:
It is well established that elevated vertical loadrates on footstrike are a risk factor for developing running injuries. Overstriding, or increased foot and ...tibial angles at footstrike, has been theorized to increase loading rate. Thus, it is often suggested that runners shorten their stride to reduce their injury risk. However, the relationship between landing alignment and loadrates has not been well established in current literature. Thus, we aimed to investigate the relationship between sagittal plane foot angle (FA) and tibial angle (TA) with vertical loadrates in both healthy and injured forefoot (FFS) and rearfoot strike (RFS) runners. It was hypothesized that as FA and TA increased, loadrate would increase for all runners.
Methods:
This is an ongoing study with 52 healthy runners (35 RFS, 17 FFS) and 24 injured runners (14 RFS, 10 FFS) for a total of 76 runners (51 M, 25 F; age34.3±11.4 yrs). Vertical average loadrate (VALR) and vertical instantaneous loadrate (VILR) were obtained while running at 2.68 m/s on an instrumented treadmill. All runners reported 0/10 pain during the assessment. Sagittal plane FA and TA at footstrike were measured from video recording using an open-source program. Positive FA designated RFS. Positive TA was defined as ankle anterior to the knee. Between-group differences were evaluated using paired two-tailed t-tests. Correlation coefficients (r) were computed for FA and TA with VALR and VILR (p=0.05; trend: p =0.10).
Results:
Healthy RFS - FA and TA were negatively correlated with VALR and VILR. Injured RFS – There was a trend toward negative correlation between TA and both VALR and VILR. Healthy FFS – TA was negatively correlated with both loadrates. Injured FFS – There were no significant correlations. Correlation coefficients, slopes, and p values are presented in Table 1. VALR and VILR were higher in RFS vs FFS runners (56±20 vs 40±10, 69±25 vs 54±12 BW/s, p<0.01), but were not significantly different for healthy vs injured runners (52±19 vs 56±26, 63±21 vs 67±27 BW/s, p=0.4).
Conclusion:
In contrast to current thought, preliminary results suggest that increasing FA and TA at footstrike are associated with decreasing vertical loadrates. This relationship was strongest for FA in the healthy RFS runners and weakest for FA in both the healthy and injured FFS runners. With increased FA, load attenuation may be due to increased eccentric activity of the tibialis anterior as well as increased knee flexion excursion and eccentric quadriceps activity with increased TA.
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