Large asymmetric hypertrophy of rectus abdominis muscle in professional tennis players

[EN] PURPOSE: To determine the volume and degree of asymmetry of the musculus rectus abdominis (RA) in professional tennis players. METHODS: The volume of the RA was determined using magnetic resonance imaging (MRI) in 8 professional male tennis players and 6 non-active male control subjects. RESULTS: Tennis players had 58% greater RA volume than controls (P = 0.01), due to hypertrophy of both the dominant (34% greater volume, P = 0.02) and non-dominant (82% greater volume, P = 0.01) sides, after accounting for age, the length of the RA muscle and body mass index (BMI) as covariates. In tennis players, there was a marked asymmetry in the development of the RA, which volume was 35% greater in the non-dominant compared to the dominant side (P<0.001). In contrast, no side-to-side difference in RA volume was observed in the controls (P = 0.75). The degree of side-to-side asymmetry increased linearly from the first lumbar disc to the pubic symphysis (r = 0.97, P<0.001). CONCLUSIONS: Professional tennis is associated with marked hypertrophy of the musculus rectus abdominis, which achieves a volume that is 58% greater than in non-active controls. Rectus abdominis hypertrophy is more marked in the non-dominant than in the dominant side, particularly in the more distal regions. Our study supports the concept that humans can differentially recruit both rectus abdominis but also the upper and lower regions of each muscle. It remains to be determined if this disequilibrium raises the risk of injury.

Charging The Net: Social Activism in Women's Professional Tennis

This dissertation is an analysis of social activism within women’s professional tennis. In the 46 years since the women known as the Original 9 began protesting against the pay inequality between men’s and women’s tennis, subsequent cohorts of women have brought different issues and concerns to women’s tennis, expanding its scope and efforts.  Using qualitative research, including interviews with former players and press conference participation at tournaments to access current players, this study shows the lineage of social activism within women’s tennis and the issues, expressions, risks and effects of each cohort. Intersectionality theoretically frames this study, and analyses of performativity appears regularly. Each generational cohort is a chapter of this study. The Original 9 of the Movement Cohort fought for equal prize money. The Bridge Cohort, the era of Evert and Navratilova, continued the Movement Cohort’s push for equal prize money; however, they also ushered in identity politics (including gender, sexuality, and nationality, but with the notable exception of race). The Professional Cohort, the current era, followed the Bridge Cohort and is characterized by its focus on corporatization and mass-marketing. As such, there is a focus among the players on individualism which can seem like a lack of social activism is occurring. However, race, neglected during the Bridge Cohort, emerged during the Professional Cohort. The individualism of this cohort made space for Blackness to show unapologetically, though, within certain constraints. Finally, a few players are working on social justice issues in society at large, as well as trying to institute change within women’s tennis. These players make up the Post-Professional Cohort (or, as Pam Shriver from the Bridge Cohort calls them, “Bridge Throwbacks”).  This study shows the evolution of social activism within women’s tennis, as it reflects larger social change. Though bound together as one unified body, the social activism engaged in by each generation focused on different issues, making each generational cohort distinct from the whole of women’s professional tennis.

Talent Identification and Development in Tennis

Accurately identifying individuals at a young age who are most likely to excel in a given sport remains a pursuit for coaches, parents and national governing bodies worldwide. In a sport such as tennis, the financial investment needed to support a player’s development is substantial, although this is offset by the vast sums of money that are on offer for those few elite players who reach the very top of the game. As such, tennis can be considered to represent a high risk, high reward venture, where the value of being able to better identify those who are likely to ‘make it’ takes on extra emphasis. The debate surrounding the timeless ‘nature versus nurture’ conundrum rumbles on and shows no sign of abating. The relative contribution that deliberate practice (Starkes & Ericsson, 2003) as opposed to genetics (Tucker & Collins, 2011) play in the development of champions remains a contentious issue. Popular texts such as ‘Bounce’ (Syed, 2010) and communications intended specifically for tennis coaches (Roetert, Kovacs & Crespo, 2009) have served to engage a wider community in the debate. It is the intention of this short article to summarize the key points emerging from this body of work and to offer some guidance to coaches moving forward.

Iliopsoas and gluteal muscles are asymmetric in tennis players but not in soccer players

[EN] PURPOSE: To determine the volume and degree of asymmetry of iliopsoas (IL) and gluteal muscles (GL) in tennis and soccer players. METHODS: IL and GL volumes were determined using magnetic resonance imaging (MRI) in male professional tennis (TP) and soccer players (SP), and in non-active control subjects (CG) (n = 8, 15 and 6, respectively). RESULTS: The dominant and non-dominant IL were hypertrophied in TP (24 and 36%, respectively, P<0.05) and SP (32 and 35%, respectively, P<0.05). In TP the asymmetric hypertrophy of IL (13% greater volume in the non-dominant than in the dominant IL, P<0.01) reversed the side-to-side relationship observed in CG (4% greater volume in the dominant than in the contralateral IL, P<0.01), whilst soccer players had similar volumes in both sides (P = 0.87). The degree of side-to-side asymmetry decreased linearly from the first lumbar disc to the pubic symphysis in TP (r = -0.97, P<0.001), SP (r = -0.85, P<0.01) and CG (r = -0.76, P<0.05). The slope of the relationship was lower in SP due to a greater hypertrophy of the proximal segments of the dominant IL. Soccer and CG had similar GL volumes in both sides (P = 0.11 and P = 0.19, for the dominant and contralateral GL, respectively). GL was asymmetrically hypertrophied in TP. The non-dominant GL volume was 20% greater in TP than in CG (P<0.05), whilst TP and CG had similar dominant GL volumes (P = 0.14). CONCLUSIONS: Tennis elicits an asymmetric hypertrophy of IL and reverses the normal dominant-to-non-dominant balance observed in non-active controls, while soccer is associated to a symmetric hypertrophy of IL. Gluteal muscles are asymmetrically hypertrophied in TP, while SP display a similar size to that observed in controls. It remains to be determined whether the different patterns of IL and GL hypertrophy may influence the risk of injury.

Is choking under pressure a consequence of skill-focus or increased distractibility? Results from a tennis serve task

It has been repeatedly demonstrated that athletes often choke in high pressure situations because anxiety can affect attention regulation and in turn performance. There are two competing theoretical approaches to explain the negative anxiety-performance relationship. According to skillfocus theories, anxious athletes’ attention is directed at how to execute the sport-specific movements which interrupts execution of already automatized movements in expert performers. According to distraction theories, anxious athletes are distractible and focus less on the relevant stimuli. We tested these competing assumptions in a between-subject design, as semi-professional tennis players were either assigned to an anxiety group (n = 25) or a neutral group (n = 28), and performed a series of second tennis serves into predefined target areas. As expected, anxiety was negatively related to serve accuracy. However, mediation analyses with the bootstrapping method revealed that this relationship was fully mediated by self-reported distraction and not by skill-focus.

Processo de formação de tenistas talentosos

O objetivo do presente estudo foi obter informações a respeito do processo de formação de tenistas talentosos e os consequentes fatores que contribuíram para o alcance do profissionalismo. Para tanto, se utilizou uma amostra de cinco tenistas brasileiros profissionais, caracterizados por terem pontos na ATP (Associação dos Tenistas Profissionais). A pesquisa foi constituída através de um delineamento qualitativo, que utilizou como instrumento uma entrevista composta por três perguntas abertas, elaboradas para explorar o contexto de formação do talento. Para a análise dos resultados foi utilizado o “Discurso do Sujeito Coletivo”. De acordo com os resultados, pode-se observar a importância que os professores tiveram no desenvolvimento destes tenistas talentosos, tanto na iniciação como no treinamento. No que se diz respeito ao planejamento dos treinos, o presente estudo demonstra a falta de profissionalismo nas fases iniciais do processo de formação, e a posterior preocupação apenas quando este atleta demonstra possuir algum potencial para seguir carreira profissional.

Tom Harmon and Elyse Knox Harmon with guests, 1951

(L-R: Mr. and Mrs. Jim Brown (actor), Mr. and Mrs. Bob Harmon (professional tennis player), Tom Harmon, Elyse Harmon, Kris Harmon, Mrs. William Powell ( wife of actor William Powell), Phillip Reed (actor), Dorothy Ford (actress)

Predicting shot locations in tennis using spatiotemporal data

Over the past decade, vision-based tracking systems have been successfully deployed in professional sports such as tennis and cricket for enhanced broadcast visualizations as well as aiding umpiring decisions. Despite the high-level of accuracy of the tracking systems and the sheer volume of spatiotemporal data they generate, the use of this high quality data for quantitative player performance and prediction has been lacking. In this paper, we present a method which predicts the location of a future shot based on the spatiotemporal parameters of the incoming shots (i.e. shot speed, location, angle and feet location) from such a vision system. Having the ability to accurately predict future short-term events has enormous implications in the area of automatic sports broadcasting in addition to coaching and commentary domains. Using Hawk-Eye data from the 2012 Australian Open Men's draw, we utilize a Dynamic Bayesian Network to model player behaviors and use an online model adaptation method to match the player's behavior to enhance shot predictability. To show the utility of our approach, we analyze the shot predictability of the top 3 players seeds in the tournament (Djokovic, Federer and Nadal) as they played the most amounts of games.

Analyzing and predicting events in soccer and tennis using spatiotemporal data

In this paper, we summarize our recent work in analyz- ing and predicting behaviors in sports using spatiotemporal data. We specifically focus on two recent works: 1) Predicting the location of shot in tennis using Hawk-Eye tennis data, and 2) Clustering spatiotemporal plays in soccer to discover the methods in which they get a shot on goal from a professional league.