, exhibiting a breaking point representing the attenuation of the increase in [HHb] and the onset of a plateau-like response. 3 , 4 Because of its relationship with whole-body physiological responses, the [HHb] breaking point ([HHb]BP) has been compared with exercise intensity thresholds. 3 , 5 , 6 Some
Tiago Turnes, Rafael Penteado dos Santos, Rafael Alves de Aguiar, Thiago Loch, Leonardo Trevisol Possamai and Fabrizio Caputo
Erin Calaine Inglis, Danilo Iannetta, Daniel A. Keir and Juan M. Murias
” is a key element in predicting performance and assessing training effectiveness. 1 Among the indices thought to reflect this important boundary are the respiratory compensation point (RCP) and the near-infrared spectroscopy-derived muscle deoxyhemoglobin ([HHb]) break point ([HHb] BP ) of ramp
Jerónimo Aragón-Vela, Yaira Barranco-Ruiz, Cristina Casals-Vázquez, Julio Plaza-Díaz, Rafael A. Casuso, Luis Fontana and Jesús F. Rodríguez Huertas
thresholds. It has been reported that an electromyographic (EMG) break point, named surface EMG fatigue threshold (EMG FT ), appears during incremental effort exercises that involve large muscle masses, such as running or cycling ( Lucía, Sánchez, Carvajal, & Chicharro, 1999 ). This break point is the result
Nels Popp, Jason Miller and Marion Hambrick
The United States Tennis Association is the National Governing Body for tennis in the U.S. and is comprised of three major divisions: (a) professional tennis, (b) player development, and (c) community tennis. The USTA’s signature event and primary source of income is the U.S. Open tennis tournament. The organization currently faces several challenges, including two issues which have received significant media attention. The USTA currently lags behind several other nations in developing elite young players, despite the U.S. having large participant numbers. Also, financially-speaking, the U.S. Open is a highly successful event, but its largest show court lacks a roof, which has proven costly as several championship events have been postponed due to weather. The challenge of this case study is for students to develop a strategic plan for how the USTA can best use their resources to grow tennis in the United States.
Daniel A. Gruber
This article presents a case study of the developments in media gatekeeping in the last 10 years, focusing on the launch of the Tennis Channel and the ascendance of ESPN as the major network for professional tennis in the United States. The U.S. broadcast networks NBC and CBS have ceded the exclusive television rights for 2 of the Grand Slam tournaments (Wimbledon, U.S. Open) to ESPN for the first time in over 40 years. Meanwhile, the Tennis Channel, despite its independence from the media conglomerates, has carved out a niche for fans with its extensive global coverage of tournaments and for advertisers with its lucrative audience demographics. This change in dominance after the broadcast networks reigned for over 4 decades underscores the globalization of the sport and the abundance of early-round tournament matches available to fans. Organizational theories are used to analyze what has occurred and to predict what will happen next for tennis media gatekeeping in the United States.
Justin W.Y. Lee, Ming-Jing Cai, Patrick S.H. Yung and Kai-Ming Chan
eccentric hamstring strength. 15 Their results show that the Nordic break-point angle that measured from a video-based motion analysis was related to eccentric hamstring peak torque (intraclass correlation coefficient [ICC] = .97, r = −.81, r 2 = .66, P < .001). However, a simple, accurate field
Emma Sconce, Paul Jones, Ellena Turner, Paul Comfort and Philip Graham-Smith
Hamstring injury-risk assessment has primarily been investigated using isokinetic dynamometry. However, practical issues such as cost and availability limit the widespread application of isokinetics for injury-risk assessment; thus, field-based alternatives for assessing eccentric hamstring strength are needed.
The aim of this study was to investigate the validity of the angle achieved during Nordic hamstring lowers (break-point angle) as a field-based test for eccentric hamstring strength.
Sixteen male (n = 7) and female (n = 9) soccer players (mean ± SD age 24 ± 6 y, height 1.77 ± 0.12 m, and body mass 68.5 ± 16.5 kg) acted as subjects for the study.
Main Outcome Measures:
The authors explored relationships between the Nordic break-point angle (the point at which the subject can no longer resist the increasing gravitational moment during a Nordic hamstring lower) measured from video and isokinetic peak torque and angle of peak torque of right- and left-knee flexors.
The results revealed a meaningful relationship between eccentric knee-flexor peak torque (average of right and left limbs) and the Nordic break-point angle (r = −.808, r 2 = 65%, P < .00001). However, there was a weak relationship observed (r = .480, r 2 = 23%, P = .06) between break-point angle and the angle of peak torque (average of right and left limbs).
The results suggest that the break-point angle achieved during Nordic hamstring lowers could be used as a field-based assessment of eccentric hamstring strength.
Yara Fidelix, Mara C. Lofrano-Prado, Leonardo S. Fortes, James O. Hill, Ann E. Caldwell, João P. Botero and Wagner L. do Prado
respiratory curves by 2 independent investigators and identified as the break point linearity between carbon dioxide production and oxygen consumption ( V ˙ O 2 ) ( V ˙ -slope), at which point the curve of oxygen ventilatory equivalent ( V ˙ E / V ˙ O 2 ) and fraction exhaled have reached their lowest values
Adam Cohen and Calvin Nite
experiences leading toward less desirable teaching outcomes. As intergroup tensions seemed to mount to a breaking point, the instructor intervened and played a mediating role in easing group tensions. While the instructor’s efforts seemed to be effective, intergroup tensions were noticeable throughout the