Laboratory versus field testing in cricket bowling: a review of current and past practice in modelling techniques     

Elliott B  Alderson J 《Sports biomechanics / International Society of Biomechanics in Sports》2007,6(1):99-108

In cricket bowling, the reconstruction of elbow angle data is of utmost importance to the bowling versus throwing argument. This paper reviews system and modelling errors inherent in three-dimensional reconstruction processes with respect to the elbow extension tolerance set by the International Cricket Council. An understanding of these factors will enable more informed decisions about the choice of in-field versus laboratory testing in the calculation of elbow extension during bowling in cricket. Although there is a paucity of objective data related to in-field and laboratory testing, biomechanists must be guided by the greater accuracy of opto-reflective than video-based systems and so testing, at least for the present, should be conducted in a laboratory setting.  相似文献   

“The Fishes and the Poet's Hands”: Frank Yerby,A Black Author in White America     

Bruce A. Glasrud  Laurie Champion 《Journal of American culture (Malden, Mass. : 2003)》2000,23(4):15-21

  相似文献   

Performance Technology and Magic     

Lindsay Robinson 《Performance Improvement》1994,33(1):3-3

  相似文献   

Self concept: Multidimensional construct exploration     

Rebecca R. Delugach  Bruce A. Bracken  Mary Jo Bracken  Michelle C. Schicke 《Psychology in the schools》1992,29(3):213-223

  相似文献   

Cardiorespiratory and perceptual responses of two interval training and a continuous training protocol in healthy young men     

João Pedro Araújo Naves  Ana Cristina Silva Rebelo  Lucas Raphael Bento E Silva  Maria Sebastiana Silva  Rodrigo Ramirez-Campillo  Robinson Ramírez-Vélez 《European Journal of Sport Science》2019,19(5):653-660

High Intensity Interval Training (HIIT) can be performed with different effort to rest time-configurations, and this can largely influence training responses. The purpose of the study was to compare the acute physiological responses of two HIIT and one moderate intensity continuous training (MICT) protocol in young men. A randomised cross-over study with 10 men [age, 28.3?±?5.5years; weight, 77.3?±?9.3?kg; height, 1.8?±?0.1?m; peak oxygen consumption (VO₂peak), 44?±?11?mL.kg^?1.min^?1]. Participants performed a cardiorespiratory test on a treadmill to assess VO₂peak, velocity associated with VO₂peak (vVO₂peak), peak heart rate (HRpeak) and perceived exertion (RPE). Then participants performed three protocols equated by distance: Short HIIT (29 bouts of 30s at vVO₂peak, interspersed by 30s of passive recovery, 29?min in total), Long HIIT (3 bouts of 4?min at 90% of vVO₂peak, interspersed by 3?min of recovery at 60% of vVO₂peak, 21?min in total) and MICT (21?min at 70% of vVO₂peak). The protocols were performed in a randomised order with ≥48 h between them. VO₂, HRpeak and RPE were compared. VO₂peak in Long HIIT was significantly higher than Short HIIT and MICT (43?±?11 vs 32?±?8 and 37?±?8?mL.kg^?1.min^?1, respectively, P?P?P?2, HR and RPE than Short HIIT and MICT, suggesting a higher demand on the cardiorespiratory system. Short HIIT and MICT presented similar physiologic and perceptual responses, despite Short HIIT being performed at higher velocities.  相似文献   

Can we stil believe?     

W. Robinson M.A. B.Sc. D.D. 《British Journal of Religious Education》1936,3(1):14-19

  相似文献   

The study of Israel's history     

H. Wheeler Robinson D.D. 《British Journal of Religious Education》1934,1(1):31-36

  相似文献   

Jeremiah—An old testament hero     

Theodore H. Robinson Litt:D. D.D. 《British Journal of Religious Education》1934,1(2):63-71

  相似文献   

A study of the plasticity of paint     

Eugene C. Bingham  Herbert D. Bruce  Martin O. Wolbach 《Journal of The Franklin Institute》1923,195(3):303-317

  相似文献   

The relationship between shoulder alignment and elbow joint angle in cricket fast-medium bowlers     

Roca M  Elliott B  Alderson J  Foster D 《Journal of sports sciences》2006,24(11):1127-1135

The aim of this study was to examine the relationship between shoulder alignment and elbow angle during the delivery action of fast-medium bowlers. The elbow and upper trunk alignment were recorded for 13 high-performance bowlers (mean age 20 years) using a 12-camera Vicon motion analysis system operating at 250 Hz. The three highest velocity trials for "good" and "short" length deliveries were analysed. Results showed that bowlers with a more front-on shoulder alignment at back-foot impact and when the upper arm was horizontal to the ground experienced a significantly greater elbow flexion--extension range when compared with those who had a more side-on orientation at the same point in the delivery action. Bowlers with greater shoulder counter-rotation also recorded higher elbow flexion and subsequently extension during the period from upper arm horizontal to ball release. Shoulder alignment and elbow angles were similar for "short" and "good" length deliveries. It was concluded that bowlers with a more front-on shoulder orientation at back-foot impact demonstrated a higher elbow extension from upper arm horizontal to ball release and are therefore more likely to infringe International Cricket Council elbow tolerance levels, compared with those who adopt a more side-on shoulder orientation at back-foot impact.  相似文献