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1.
J Bodyw Mov Ther ; 39: 156-161, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38876620

RESUMO

BACKGROUND: The core musculature gets activated by feed forward fashion during the movement of upper extremity, as in kinetic chain of throwing, shoulder muscle contributes larger dynamic balance and also in reversed manner. Aim of the current study was to associate the strength of core and the dynamic balance of throwing hand in cricket fast bowlers. METHODS: 72 subjects were initially screened for eligibility, and ultimately, 55 male participants from various cricket coaching academies, aged 19.1 ± 2.6 on average, were included. The mean BMI of the participants was 20.9. The assessments included the Modified Upper Quarter Y Balance Test (mUQYBT)- Medial (M), Supero-Lateral reach (SL), Infero-Lateral reach(IL) along with Core measures- 600 Abdominal flexion test (600 AFT), right side plank test (RSP), Left side plank test (LSP), Beiring Sorenson test (BST), all of which were successfully completed. RESULTS: Based on our findings, we observed a mild positive correlation between the values of mUQYBT and core measures. We employed Pearson's coefficient to evaluate the association, and the R2 values were utilized to quantify the amount of variability. The resulting scores were RSP to SL (r = 0.38, R2 = 0.14), LSP to SL (r = 0.43, R2 = 0.19), LSP to RSP (r = 0.790, R2 = 0.62), BSP to Composite score (r = 0.29, R2 = 0.08), SL to 600 AFT* (r = 0.231, R2 = 0.05) and BMI to IL* (r = -0.107, R2 = 0.01). CONCLUSION: In conclusion, a positive correlation was exhibited between dynamic balance and core strength in healthy cricket fast bowlers. Educating bowlers on proper movement techniques and prescribing targeted exercises can enhance dynamic balance, reducing the risk of injuries.


Assuntos
Críquete , Força Muscular , Equilíbrio Postural , Humanos , Masculino , Estudos Transversais , Críquete/fisiologia , Força Muscular/fisiologia , Adulto Jovem , Equilíbrio Postural/fisiologia , Adolescente , Adulto , Extremidade Superior/fisiologia , Músculo Esquelético/fisiologia
2.
Sensors (Basel) ; 24(11)2024 May 24.
Artigo em Inglês | MEDLINE | ID: mdl-38894175

RESUMO

Motion Capture (MoCap) has become an integral tool in fields such as sports, medicine, and the entertainment industry. The cost of deploying high-end equipment and the lack of expertise and knowledge limit the usage of MoCap from its full potential, especially at beginner and intermediate levels of sports coaching. The challenges faced while developing affordable MoCap systems for such levels have been discussed in order to initiate an easily accessible system with minimal resources.


Assuntos
Desempenho Atlético , Humanos , Desempenho Atlético/fisiologia , Críquete/fisiologia , Captura de Movimento
3.
PLoS One ; 19(6): e0302647, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38857238

RESUMO

The primary aim of this study was to present the physical profile of female cricketers. Secondary, was to assess any differences between playing standard (professional vs. non-professional) and position (seam bowler vs. non-seam bowler). Fifty-four female cricketers (professional seam bowler [n = 16]; professional non-seam bowler [n = 17]; non-professional seam bowler [n = 10]; non-professional non-seam bowler [n = 11]) undertook a battery of physical and anthropometric assessments during the off-season period. Participant's physical profile was assessed via the broad jump, countermovement jump, isometric mid-thigh pull (IMTP), 20 m sprint, run-2 cricket specific speed test, and Yo-Yo Intermittent Recovery Test Level-1 (Yo-Yo-IR1). The sum-of-eight skinfold measurement was also recorded for professional cricketers only. Differences between playing standard and position were assessed with a two-way ANOVA. Seam bowlers possessed a significantly (p < 0.04) greater stature and had a higher body mass than non-seam bowlers. Non-seam bowlers recorded significantly (p < 0.01) further broad jump, higher normalised peak vertical force during the IMTP, and ran greater distances during the Yo-Yo-IR1. Professional cricketers produced significantly further run distances for the Yo-Yo-IR1 and faster run-2 times for the dominant turning side than non-professional cricketers. This study provides valuable insights into the physical profile of female cricketers across playing standards and positions which practitioners can use to direct and enhance training outcomes.


Assuntos
Desempenho Atlético , Críquete , Humanos , Feminino , Críquete/fisiologia , Desempenho Atlético/fisiologia , Adulto , Adulto Jovem , Corrida/fisiologia , Atletas
4.
J Sports Sci ; 42(8): 708-719, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38861612

RESUMO

This study aimed to investigate inter- and intra-athlete technique variability in pre-elite and elite Australian fast bowlers delivering new ball conventional swing bowling. Ball grip angle and pelvis, torso, shoulder, elbow, wrist, upper arm, forearm, and hand kinematics were investigated at the point of ball release for inswing and outswing deliveries. Descriptive evaluations of group and individual data and k-means cluster analyses were used to assess inter- and intra-bowler technique variability. Inter-athlete technique and ball grip variability were identified, demonstrating that skilled bowlers use individualised strategies to generate swing. Functional movement variability was demonstrated by intra-athlete variability in successful swing bowling trials. Bowlers demonstrated stable technique parameters in large proximal body segments of the pelvis and torso, providing a level of repeatability to their bowling action. Greater variation was observed in bowling arm kinematics, allowing athletes to manipulate the finger and ball position to achieve the desired seam orientation at the point of ball release. This study demonstrates that skilled bowlers use individualised techniques and grips to generate swing and employ technique variations in successive deliveries. Coaches should employ individualised training strategies and use constraints-led approaches in training environments to encourage bowlers to seek adaptive movement solutions to generate swing.


Assuntos
Críquete , Destreza Motora , Tronco , Humanos , Masculino , Fenômenos Biomecânicos , Destreza Motora/fisiologia , Adulto Jovem , Tronco/fisiologia , Críquete/fisiologia , Austrália , Movimento/fisiologia , Pelve/fisiologia , Estudos de Tempo e Movimento , Mãos/fisiologia , Punho/fisiologia , Adulto , Ombro/fisiologia , Extremidade Superior/fisiologia
5.
J Biomech ; 170: 112157, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38797081

RESUMO

Researchers have extensively studied the biomechanics and anthropometrics of fast bowling in men's cricket, but there is still limited research in women's cricket. This study describes and compares the anthropometric qualities and bowling biomechanics between elite male and female fast bowlers. An inertial measurement system was used to collect three-dimensional biomechanical data for 20 elite fast bowlers (13 males and seven females). Kinematic data was captured at one step before back foot contact, back foot contact, front foot contact, ball release to one step after ball release. Anthropometric measurements included body segment lengths, mass, body fat (BF%) and muscle mass (MM%). The student t-test and Mann-Whitney U test were used for analyses. Hotelling's T2 statistic was calculated to control Type I error during multiple comparisons (p = 0.045). Males and females differed in overall height, limb length, BF% and MM%. Females presented with slower ball release speeds (p = 0.001). Biomechanically, the females were more front-on when approaching the delivery stride and then initiated pelvis and trunk rotation during the delivery stride, not seen in the males. Females and males have a similar magnitude of trunk side-flexion, but females present with a different strategy than males (p = 0.038). Females presented with increased front knee extension at ball release (p = 0.05). The findings from this study emphasise the differences between male and female fast bowlers and suggest that the coaching principles used in male fast bowling may not be relevant to female fast bowlers.


Assuntos
Antropometria , Humanos , Feminino , Masculino , Fenômenos Biomecânicos , Antropometria/métodos , Adulto , Críquete/fisiologia , Adulto Jovem
6.
J Strength Cond Res ; 38(6): 1095-1102, 2024 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-38781468

RESUMO

ABSTRACT: Jacobs, J, Olivier, B, Brandt, C, and Jafta, G. Physical profiles of all-rounders, batters, and bowlers in sub-elite women's cricket. J Strength Cond Res 38(6): 1095-1102, 2024-The unique physical profile of each player's role in sub-elite women's cricket is vital for optimizing performance as these players progress to the elite levels. This quantitative, cross-sectional study investigates the physical profiles of sub-elite women's cricket players as a group and compares these profiles across different player roles. Sub-elite female cricket players in the South African domestic women's cricket league were included in this study. A battery of physical assessments were conducted at the start of the 2022/23 season. The physical assessments included body composition, individual muscle strength testing using dynamometry, 2-km time trial (TT), countermovement jump (CMJ), single-leg jump (SLJ), isometric mid-thigh pull, push-up, and hop test on force plates. A total of 44 female players (20.86 ± 1.6 years) were included in the study. Differences were found in muscle mass (p = 0.004) and peak power (p = 0.040) for all-rounders and bowlers. Player roles presented with different dominant (p = 0.006) and non-dominant (p = 0.066) knee flexion strength. The bowlers' body composition and physical strength profile are compromised compared with batters and all-rounders. There were several physical strength and power differences between pace and spin bowlers in CMJ and SLJ tests for jump height (p = 0.009) and peak power (p = 0.006). Batters performed the best in the 2-km TT. Body composition and musculoskeletal profiles for each player role can be baseline markers in sub-elite women's cricket. Stakeholders can use this information to guide physical preparation for players advancing to elite levels.


Assuntos
Desempenho Atlético , Composição Corporal , Críquete , Força Muscular , Humanos , Feminino , Estudos Transversais , Críquete/fisiologia , Força Muscular/fisiologia , Adulto Jovem , Desempenho Atlético/fisiologia , Composição Corporal/fisiologia , África do Sul , Teste de Esforço , Músculo Esquelético/fisiologia , Adolescente , Adulto
7.
J Sports Sci ; 42(5): 455-464, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38630902

RESUMO

Despite evidence that elite-level cricket umpires are highly accurate in making leg-before-wicket (LBW) judgements, there is limited understanding as to how they make these judgements. In this study, we explored the explicit LBW decision-making expertise of elite-level cricket umpires (N = 10) via 10 individual semi-structured interviews. Using thematic analysis, we aimed to identify the sources of information that umpires incorporate into their decision-making process. Results indicated that umpires engage in intentional pre-delivery information-gathering to guide their expectations, and to set context-specific parameters as to what would constitute an LBW dismissal. Not only do umpires use information about the ball trajectory, but they also use additional information about the condition of the pitch, the action-capabilities and susceptibilities of players, and the unique requirements of different match formats. Umpires reported employing a gaze-anchor strategy when gathering information for each delivery and described the process of this information as initially intuitive, before engaging in deeper post-hoc reasoning. Findings highlight the importance of including contextual information when exploring officials' decisions and may inform future training interventions for cricket umpires.


Assuntos
Críquete , Tomada de Decisões , Julgamento , Humanos , Críquete/fisiologia , Masculino , Feminino , Adulto , Adulto Jovem , Perna (Membro)/fisiologia
8.
J Sci Med Sport ; 27(6): 408-414, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38423830

RESUMO

OBJECTIVES: Investigate the visibility of new and old red, white and pink cricket balls under lighting and background conditions experienced during a day-night cricket match. DESIGN: We modelled the luminance contrast signals available for a typical observer for a ball against backgrounds in a professional cricket ground, at different times of day. METHODS: Spectral reflectance (light reflected as a function of wavelength) was derived from laboratory measurements of new and old red, white and pink balls. We also gathered spectral measurements from backgrounds (pitch, grass, sightscreens, crowd, sky) and spectral illuminance during a day-night match (natural afternoon light, through dusk to night under floodlights) from Lord's Cricket Ground (London, UK). The luminance contrast of the ball relative to the background was calculated for each combination of ball, time of day, and background surface. RESULTS: Old red and old pink balls may offer little or no contrast against the grass, pitch and crowd. New pink balls can also be of low contrast against the crowd at dusk, as can pink and white balls (of any age) against the sky at dusk. CONCLUSIONS: Reports of difficulties with visibility of the pink ball are supported by our data. However, our modelling also shows that difficulties with visibility may also be expected under certain circumstances for red and white balls. The variable conditions in a cricket ground and the changing colour of an ageing ball make maintaining good visibility of the ball a challenge when playing day-night matches.


Assuntos
Críquete , Humanos , Críquete/fisiologia , Equipamentos Esportivos , Iluminação , Sensibilidades de Contraste/fisiologia
9.
Med Sci Sports Exerc ; 54(3): 438-446, 2022 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-34711706

RESUMO

INTRODUCTION: Localized bone mineral density (BMD) adaptation of the lumbar spine, particularly on the contralateral side to the bowling arm, has been observed in elite male cricket fast bowlers. No study has investigated this in adolescents, or the role of fast bowling technique on lumbar BMD adaptation. This study aims to investigate lumbar BMD adaptation in adolescent cricket fast bowlers, and its relationship with fast bowling technique. METHODS: Thirty-nine adolescent fast bowlers underwent anteroposterior dual x-ray absorptiometry scan of their lumbar spine. Hip, lumbopelvic and thoracolumbar joint kinematics, and vertical ground reaction kinetics were determined using three-dimensional motion capture and force plates. Significant partial (covariate: fat-free mass) and bivariate correlations of the technique parameters with whole lumbar (L1-L4) BMD and BMD asymmetry (L3 and L4) were advanced as candidate variables for multiple stepwise linear regression. RESULTS: Adolescent fast bowlers demonstrated high lumbar Z-Scores (+1.0; 95% confidence interval [CI], 0.7-1.4) and significantly greater BMD on the contralateral side of L3 (9.0%; 95% CI, 5.8%-12.1%) and L4 (8.2%; 95% CI, 4.9%-11.5%). Maximum contralateral thoracolumbar rotation and maximum ipsilateral lumbopelvic rotation in the period between back foot contact and ball release (BR), as well as contralateral pelvic drop at front foot contact, were identified as predictors of L1 to L4 BMD, explaining 65% of the variation. Maximum ipsilateral lumbopelvic rotation between back foot contact and BR, as well as ipsilateral lumbopelvic rotation and contralateral thoracolumbar side flexion at BR, were predictors of lumbar asymmetry within L3 and L4. CONCLUSIONS: Thoracolumbar and lumbopelvic motion are implicated in the etiology of the unique lumbar bone adaptation observed in fast bowlers whereas vertical ground reaction force, independent of body mass, was not. This may further implicate the osteogenic potential of torsional rather than impact loading in exercise-induced adaptation.


Assuntos
Densidade Óssea/fisiologia , Críquete/fisiologia , Vértebras Lombares/fisiologia , Movimento/fisiologia , Absorciometria de Fóton , Adolescente , Fenômenos Biomecânicos , Humanos , Masculino
10.
PLoS One ; 16(11): e0259423, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34748588

RESUMO

In this paper, the Duckworth-Lewis-Stern (DLS) and Duckworth-Lewis-McHale-Asif (DLMA) methods of revising targets for a team batting in second innings in an interrupted Limited Overs International Cricket (LOI), are examined for fairness. The work discusses four significant points: flexibility, intuition, simplicity, and goodness-of-fit of the two mentioned methods. The research findings have shown that the DLMA method is better in every aspect than the DLS method. Further, the data of 1764 ODI matches played during 2004-2021 to investigate the compatibility of the DLMA for high run-scoring One-Day International matches. The results show that DLMA is compatible to the situation of the well-above run-scoring situation.


Assuntos
Desempenho Atlético/fisiologia , Desempenho Atlético/psicologia , Críquete/fisiologia , Críquete/psicologia , Análise e Desempenho de Tarefas , Modelos Biológicos , Projetos de Pesquisa
11.
J Sports Sci ; 39(20): 2361-2369, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34096462

RESUMO

This study examined the relationships between physical capacity, bowling technique and ball speed in 20 fast-bowlers. Technique factors correlated with ball speed were; bowling action duration (r = -0.639, p = 0.002), run-up velocity (r = 0.616, p = 0.004), back foot contact (BFC) time (r = -0.608, p = 0.004), front foot contact (FFC)-ball release (BR) duration (r = -0.602, p = 0.005), delivery stride phase acceleration (r = -0.582, p = 0.007), delivery stride duration (r = -0.547, p = 0.012), time of peak horizontal braking force (r = -0.538, p=0.014), peak pelvis COM velocity (BFC-BR) (r = 0.469, p = 0.037) and peak vertical GRF time (r = -0.461, p = 0.041). Physical capacities were; 10-30 m split (r = -0.554, p = 0.011), 30 m sprint (r = -0.482, p = 0.031) and IMTP (r = 0.471, p = 0.036). Stepwise regression showed bowling action duration and 10-30 m split explained 54% (p = 0.001) of ball speed variation. Ball speed was associated with faster run-ups, shorter BFC times and abrupt FFC GRF application. Coaches should also consider sprint speed and lower-body strength as important modifiable factors for fast-bowlers.


Assuntos
Críquete/fisiologia , Destreza Motora/fisiologia , Aceleração , Adolescente , Fenômenos Biomecânicos , Humanos , Modelos Lineares , Masculino , Força Muscular , Aptidão Física/fisiologia , Equipamentos Esportivos , Estudos de Tempo e Movimento , Adulto Jovem
12.
J Sports Sci ; 39(21): 2393-2400, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-34128451

RESUMO

Organismic, task, and environmental constraints are known to differ between skilled male and female cricket batters during power hitting tasks. Despite these influences, the techniques used in such tasks have only been investigated in male cricket batters. This study compared power hitting kinematics between 15 male and 15 female batters ranging from university to international standard. General linear models were used to assess the effect of gender on kinematic parameters describing technique, with height and body mass as covariates. Male batters generated greater maximum bat speeds, ball launch speeds, and ball carry distances than female batters on average. Male batters had greater pelvis-thorax separation in the transverse plane at the commencement of the downswing (ß = 1.14; p = 0.030) and extended their lead elbows more during the downswing (ß = 1.28; p = 0.008) compared to female batters. The hypothesised effect of gender on the magnitude of wrist uncocking during the downswing was not observed (ß = -0.14; p = 0.819). The causes of these differences are likely to be multi-factorial, involving aspects relating to the individual players, their history of training experiences and coaching practices, and the task of power hitting in male or female cricket.


Assuntos
Estatura , Índice de Massa Corporal , Críquete/fisiologia , Destreza Motora/fisiologia , Fenômenos Biomecânicos , Cotovelo/fisiologia , Feminino , Humanos , Masculino , Pelve/fisiologia , Caracteres Sexuais , Tórax/fisiologia , Punho/fisiologia , Adulto Jovem
13.
J Sports Sci ; 39(16): 1807-1815, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-33687302

RESUMO

This study investigated the relationship between front foot contact (FFC) ground reaction forces (GRF) during the delivery stride, lower-limb strength, eccentric dexterity and power, and ball release speed (BRS) among pace bowlers. Thirteen high-level male pace bowlers performed double and single leg drop landings; isometric mid-thigh pull; countermovement jump; and pace bowling (two-over bowling spell measuring BRS and FFC GRF). The relationship between assessed variables and BRS was determined via frequentist and Bayesian multiple linear regression. The model including peak braking force was the most probable given the data (Bayes Factor=1.713) but provided only weak evidence in comparison to the null model. The results of frequentist and Bayesian modelling were comparable with peak braking force explaining 23.3% of the variance in BRS (F(1, 11)=4.64, P=0.054). Results indicate pace bowlers with greater peak braking GRF during FFC generally elicit higher BRS. However, the weak relationship between peak braking force and BRS, and the lack of a linear relationship between BRS and other variables, highlights the complexities and inter-individual variability inherent to pace bowling at a high-level. A more individual-focused analysis revealed varied strategies within pace bowlers to deliver the outcome (e.g., BRS) and should be considered in future study designs.


Assuntos
Desempenho Atlético/fisiologia , Críquete/fisiologia , Pé/fisiologia , Músculo Esquelético/fisiologia , Suporte de Carga/fisiologia , Adolescente , Adulto , Fenômenos Biomecânicos , Estudos Transversais , Humanos , Cinética , Masculino , Adulto Jovem
14.
J Sports Sci ; 39(12): 1402-1409, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33480328

RESUMO

This study examined whether an inertial measurement unit (IMU), in combination with machine learning, could accurately predict two indirect measures of bowling intensity through ball release speed (BRS) and perceived intensity zone (PIZ). One IMU was attached to the thoracic back of 44 fast bowlers. Each participant bowled 36 deliveries at two different PIZ zones (Zone 1 = 24 deliveries at 70% to 85% of maximum perceived bowling effort; Zone 2 = 12 deliveries at 100% of maximum perceived bowling effort) in a random order. IMU data (sampling rate = 250 Hz) were downsampled to 125 Hz, 50 Hz, and 25 Hz to determine if model accuracy was affected by the sampling frequency. Data were analysed using four machine learning models. A two-way repeated-measures ANOVA was used to compare the mean absolute error (MAE) and accuracy scores (separately) across the four models and four sampling frequencies. Gradient boosting models were shown to be the most consistent at measuring BRS (MAE = 3.61 km/h) and PIZ (F-score = 88%) across all sampling frequencies. This method could be used to measure BRS and PIZ which may contribute to a better understanding of overall bowling load which may help to reduce injuries.


Assuntos
Acelerometria/instrumentação , Desempenho Atlético/fisiologia , Críquete/fisiologia , Aprendizado de Máquina , Percepção/fisiologia , Esforço Físico/fisiologia , Traumatismos em Atletas/prevenção & controle , Fenômenos Biomecânicos , Críquete/lesões , Estudos Transversais , Humanos , Masculino , Fenômenos Físicos , Equipamentos Esportivos , Dispositivos Eletrônicos Vestíveis , Adulto Jovem
15.
J Sports Sci ; 39(12): 1339-1347, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33404378

RESUMO

This study aimed to identify the predictive capacity of wellness questionnaires on measures of training load using machine learning methods. The distributions of, and dose-response between, wellness and other load measures were also examined, offering insights into response patterns. Data (n= 14,109) were collated from an athlete management systems platform (Catapult Sports, Melbourne, Australia) and were split across three sports (cricket, rugby league and football) with data analysis conducted in R (Version 3.4.3). Wellness (sleep quality, readiness to train, general muscular soreness, fatigue, stress, mood, recovery rating and motivation) as the dependent variable, and sRPE, sRPE-TL and markers of external load (total distance and m.min-1) as independent variables were included for analysis. Classification and regression tree models showed high cross-validated error rates across all sports (i.e., > 0.89) and low model accuracy (i.e., < 5% of variance explained by each model) with similar results demonstrated using random forest models. These results suggest wellness items have limited predictive capacity in relation to internal and external load measures. This result was consistent despite varying statistical approaches (regression, classification and random forest models) and transformation of wellness scores. These findings indicate practitioners should exercise caution when interpreting and applying wellness responses.


Assuntos
Nível de Saúde , Aprendizado de Máquina , Condicionamento Físico Humano/fisiologia , Condicionamento Físico Humano/psicologia , Esportes/fisiologia , Esportes/psicologia , Inquéritos e Questionários , Afeto , Críquete/fisiologia , Críquete/psicologia , Árvores de Decisões , Fadiga/diagnóstico , Futebol Americano/fisiologia , Futebol Americano/psicologia , Sistemas de Informação Geográfica , Humanos , Motivação , Mialgia/diagnóstico , Percepção/fisiologia , Esforço Físico/fisiologia , Análise de Regressão , Sono/fisiologia , Futebol/fisiologia , Futebol/psicologia , Estresse Psicológico/diagnóstico , Dispositivos Eletrônicos Vestíveis
16.
Med Sci Sports Exerc ; 53(3): 581-589, 2021 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-32910096

RESUMO

INTRODUCTION: Lumbar bone stress injuries (LBSI) are the most prevalent injury in cricket. Although fast bowling technique has been implicated in the etiology of LBSI, no previous study has attempted to prospectively analyze fast bowling technique and its relationship to LBSI. The aim of this study was to explore technique differences between elite cricket fast bowlers with and without subsequent LBSI. METHODS: Kinematic and kinetic technique parameters previously associated with LBSI were determined for 50 elite male fast bowlers. Group means were compared using independent-samples t-tests to identify differences between bowlers with and without a prospective LBSI. Significant parameters were advanced as candidate variables for a binary logistic regression analysis. RESULTS: Of the 50 bowlers, 39 sustained a prospective LBSI. Significant differences were found between injured and noninjured bowlers in rear knee angle, rear hip angle, thoracolumbar side flexion angle, and thoracolumbar rotation angle at back foot contact; the front hip angle, pelvic tilt orientation, and lumbopelvic angle at front foot contact; and the thoracolumbar side flexion angle at ball release and the maximal front hip angle and ipsilateral pelvic drop orientation. A binary logistic model, consisting of rear hip angle at back foot contact and lumbopelvic angle at front foot contact, correctly predicted 88% of fast bowlers according to injury history and significantly increased the odds of sustaining an LBSI (odds ratio, 0.88 and 1.25, respectively). CONCLUSIONS: Lumbopelvic motion is implicated in the etiology of LBSI in fast bowling, with inadequate lumbopelvifemoral complex control as a potential cause. This research will aid the identification of fast bowlers at risk of LBSI, as well as enhancing coaching and rehabilitation of fast bowlers from LBSI.


Assuntos
Fenômenos Biomecânicos/fisiologia , Críquete/lesões , Vértebras Lombares/lesões , Atletas , Traumatismos em Atletas/etiologia , Críquete/fisiologia , Pé/fisiologia , Articulação do Quadril/fisiologia , Humanos , Articulação do Joelho/fisiologia , Modelos Logísticos , Masculino , Postura/fisiologia , Estudos Prospectivos , Amplitude de Movimento Articular/fisiologia , Análise de Regressão , Coluna Vertebral/fisiologia , Adulto Jovem
17.
Eur J Sport Sci ; 21(8): 1119-1128, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32883180

RESUMO

Optimal throwing speed and accuracy is built on a complex interaction of multiple variables. Although strength and power has been associated with throwing speed in cricketers, the individual muscles that contribute to optimal function of the shoulder-complex has not been adequately explored in connection with throwing performance. Consequently, this study aimed to investigate the correlation between musculoskeletal variables and overhead throwing performance in cricketers. Thirty-two amateur male cricketers were tested using a battery of 16 tests (strength, flexibility, scapula positioning) as well as a throwing speed (TS) and a novel accuracy test (TA). Only two of the sixteen tests were correlated with throwing performance in the multiple regression analysis. Non-dominant hip abduction strength correlated positively with TS (p < 0.05): on average, a strength increase of 10 newtons (N) was associated with an increase in TS of 0.60 km/h (95% CI: 0.12-1.08). Non-dominant pectoralis minor length correlated positively with TA (p < 0.01): on average, a one-centimetre increase in the length correlated to an increase, of 0.633 points (95% CI: 0.225-1.041). This cross-sectional study demonstrated that from an array of musculoskeletal variables, only non-dominant hip abduction strength correlated with TS, while only non-dominant pectoralis minor length correlated with TA in amateur cricketers.


Assuntos
Desempenho Atlético/fisiologia , Críquete/fisiologia , Destreza Motora/fisiologia , Artralgia/fisiopatologia , Fenômenos Biomecânicos , Críquete/lesões , Estudos Transversais , Quadril/fisiologia , Humanos , Masculino , Força Muscular , Músculos Peitorais/anatomia & histologia , Músculos Peitorais/fisiologia , Rotação , Ombro/fisiologia , Ombro/fisiopatologia , Análise e Desempenho de Tarefas , Adulto Jovem
18.
J Sci Med Sport ; 24(5): 505-510, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33288447

RESUMO

OBJECTIVES: To quantify and compare the match demands and variability of international One-Day (ODI) with Twenty20 (T20) cricket matches and to compare ODI match demands when competing home and away. DESIGN: Single cohort, longitudinal observation. METHODS: Thirteen international male seam bowlers across 204matches (ODI=160; T20=44) were investigated over five-years (2015-2019). Using global positioning sensors and accelerometers, physical demands were quantified using distance covered at different velocities and the number of entries into high and low intensity acceleration and deceleration bands. Variability was quantified using coefficient of variation (CV) and smallest worthwhile change. RESULTS: Significantly greater (p<0.05) match demands were found for all physical variables relative to minutes played for T20 against ODI matches, except for distance covered 20-25kmh-1 which was greater for ODI. Distance covered between 0-7km∙h-1 showed no significance difference (p=0.60). The number of moderate decelerations (2-4m∙s2) were greater (p=0.04) away compared to home in ODI. All other variables showed no significance. Relative to minutes played, decelerations ≤4m∙s2 (within-player ODI CV=75.5%. T20=72.0%) accelerations >4m∙s2 (within-player ODI CV=79.2%. T20 CV=77.2%. Between-player ODI CV=84.7%. T20=38.8%) and distance covered >25kmh-1 (within-player ODI CV=65.5%. T20=64.1%) showed the greatest variability. CONCLUSIONS: Players are exposed to different physical demands in ODI Vs T20 matches, but not for home Vs away ODI matches. Practitioners should be aware of the large variability in high-speed/intensity accelerations and decelerations across matches.


Assuntos
Desempenho Atlético/fisiologia , Críquete/fisiologia , Corrida/fisiologia , Acelerometria , Adulto , Estudos de Coortes , Sistemas de Informação Geográfica , Humanos , Estudos Longitudinais , Masculino , Adulto Jovem
19.
J Sports Med Phys Fitness ; 61(5): 753-759, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33146492

RESUMO

BACKGROUND: Great demands are imposed upon the perceptual-motor system when undertaking ball-throwing and -hitting tasks including cricket. That is, performers must detect and resolve object details while on the move - something referred to as dynamic visual acuity (DVA). The present study aimed to investigate DVA in skilled cricketers and non-cricketers using a more immediate or real-time assessment. METHODS: Skilled cricketers and non-cricketers had to detect the presence of the gap within a Landolt-C ring as it moved horizontally or vertically, while progressively increasing the size until the participants registered a response. Measures were taken as the mean (dynamic) minimum angle of resolution of the object size at the moment that participants correctly responded to the gap. Objects would move at either a high, medium or low velocity. RESULTS: There was greater dynamic visual acuity in the skilled cricketers compared to non-cricketers (P<0.05). There was a reduced negative influence of object velocity on dynamic visual acuity in the skilled cricketers compared to non-cricketers (P<0.05). CONCLUSIONS: We suggest these findings contribute to the growing evidence surrounding DVA within ball-throwing and -hitting sports, while making some assertions as to the implications for the cricket performance setting.


Assuntos
Críquete/fisiologia , Destreza Motora/fisiologia , Acuidade Visual , Adolescente , Humanos , Masculino , Análise e Desempenho de Tarefas , Adulto Jovem
20.
Int J Sports Physiol Perform ; 15(10): 1485-1489, 2020 Sep 29.
Artigo em Inglês | MEDLINE | ID: mdl-32994385

RESUMO

PURPOSE: To investigate whether changes in delivery length (ie, short, good, and full) lead to alterations in whole-body biomechanical loading as determined by ground reaction force during front-foot contact of the delivery stride for pace bowlers. Current load-monitoring practices of pace bowling in cricket assume equivocal biomechanical loading as only the total number of deliveries are monitored irrespective of delivery length. METHODS: A total of 16 male pace bowlers completed a 2-over spell at maximum intensity while targeting different delivery lengths (short, 7-10 m; good, 4-7 m; and full, 0-4 m from the batter's stumps). In-ground force plates were used to determine discrete (vertical and braking force, impulse, and loading rates) and continuous front-foot contact ground reaction force. Repeated-measures analysis of variance (P < .05), effects size, and statistical parametrical mapping were used to determine differences between delivery lengths. RESULTS: There were no significant differences between short, good, and full delivery lengths for the discrete and continuous kinetic variables investigated (P = .19-1.00), with trivial to small effect sizes. CONCLUSION: There were minimal differences in front-foot contact biomechanics for deliveries of different lengths (ie, short, good, and full). These data reinforce current pace bowling load-monitoring practices (ie, counting the number of deliveries), as changes in delivery length do not affect the whole-body biomechanical loading experienced by pace bowlers. This is of practical importance as it retains simplicity in load-monitoring practice that is used widely across different competition levels and ages.


Assuntos
Fenômenos Biomecânicos , Críquete/fisiologia , , Humanos , Cinética , Masculino
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