scholarly journals Bio-Banding in Junior Soccer Players – a Pilot Study

2020 ◽  
Author(s):  
Michael Romann ◽  
Dennis Lüdin ◽  
Dennis-Peter Born
Keyword(s):  
High Speed ◽  
Talent Development ◽  
Soccer Players ◽  
Chronological Age ◽  
Match Play ◽  
Physical Demand ◽  
The Mean ◽  
Number Of Passes ◽  
Mean Time

Abstract Objective Bio-banding (BB) has been introduced to account for varying maturity and to improve the talent development of junior soccer players. To date, research that investigated the physiological and technical effects of BB is sparse. Therefore, the aim of the study was to compare effects of BB with CA on selected technical and tactical parameters in U13 and U14 soccer players. Results BB significantly increased the number of duels (p =0.024) and set pieces (p =0.025) compared to chronological age. The mean time of ball possession per action was reduced (p =0.021) and the rate of successful passes was lower with BB (p =0.001). Meanwhile, the total number of passes was unaffected (p =0.796), and there was a trend towards a lower difference in ball possession between BB teams (p =0.058). In addition, BB reduced the distances covered while jogging (p= 0.001), running (p= 0.038) and high-speed running (p= 0.035). With BB, an increased number of duels, unsuccessful passes and set pieces resulted in a quicker change of match play situations between teams. While physical demand was reduced, BB seems to result in a more technically and tactically challenging game. Benefits in long-term player development, however, require further investigation.

scholarly journals Bio-Banding In Junior Soccer Players – A Pilot Study

2020 ◽  
Author(s):  
Michael Romann ◽  
Dennis Lüdin ◽  
Dennis-Peter Born
Keyword(s):  
High Speed ◽  
Talent Development ◽  
Crossover Design ◽  
Soccer Players ◽  
Match Play ◽  
Physical Demand ◽  
The Mean ◽  
Number Of Passes ◽  
Mean Time

Abstract Objective Bio-banding (BB) has been introduced to account for varying maturity and to improve the talent development of junior soccer players. To date, research that investigated the physiological and technical effects of BB is sparse. Therefore, the aim of the study was to assess BB based on practical considerations in a cohort of 62 under (U)13 and U14 soccer players in a paired crossover design. Results BB significantly increased the number of duels and set pieces compared to chronological age (p<0.05). The mean time of ball possession per action was reduced and the rate of successful passes was lower with BB. Meanwhile, the total number of passes was unaffected, and there was a trend towards a lower difference in ball possession between BB teams (p<0.1). In addition, BB reduced the distances covered while jogging (p<0.001), running (p<0.05) and high-speed running (p<0.05). With BB, an increased number of duels, unsuccessful passes and set pieces seemed to result from a quicker and more balanced match play between teams. While physical demand was reduced, BB seems to result in a more technically and tactically challenging game. Benefits in long-term player development, however, require further investigation.

scholarly journals Surveillance System in Smart Cities: A Dependability Evaluation Based on Stochastic Models

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 876
Author(s):  
Igor Gonçalves ◽  
Laécio Rodrigues ◽  
Francisco Airton Silva ◽  
Tuan Anh Nguyen ◽  
Dugki Min ◽  
...  
Keyword(s):  
Surveillance System ◽  
Smart Cities ◽  
Heterogeneous Data ◽  
Time To Failure ◽  
Video Streams ◽  
Dependability Evaluation ◽  
The Mean ◽  
Mean Time ◽  
The Internet Of Things

Surveillance monitoring systems are highly necessary, aiming to prevent many social problems in smart cities. The internet of things (IoT) nowadays offers a variety of technologies to capture and process massive and heterogeneous data. Due to the fact that (i) advanced analyses of video streams are performed on powerful recording devices; while (ii) surveillance monitoring services require high availability levels in the way that the service must remain connected, for example, to a connection network that offers higher speed than conventional connections; and that (iii) the trust-worthy dependability of a surveillance system depends on various factors, it is not easy to identify which components/devices in a system architecture have the most impact on the dependability for a specific surveillance system in smart cities. In this paper, we developed stochastic Petri net models for a surveillance monitoring system with regard to varying several parameters to obtain the highest dependability. Two main metrics of interest in the dependability of a surveillance system including reliability and availability were analyzed in a comprehensive manner. The analysis results show that the variation in the number of long-term evolution (LTE)-based stations contributes to a number of nines (#9s) increase in availability. The obtained results show that the variation of the mean time to failure (MTTF) of surveillance cameras exposes a high impact on the reliability of the system. The findings of this work have the potential of assisting system architects in planning more optimized systems in this field based on the proposed models.

scholarly journals Injury Risk and Injury Burden Are Related to Age Group and Peak Height Velocity Among Talented Male Youth Soccer Players

2018 ◽  
Vol 6 (12) ◽  
pp. 232596711881104 ◽  
Author(s):  
Hans Jan Bult ◽  
Maarten Barendrecht ◽  
Igor Joeri Ramon Tak
Keyword(s):  
Injury Risk ◽  
Age Groups ◽  
Peak Height ◽  
Soccer Players ◽  
Height Velocity ◽  
Incidence Density ◽  
Chronological Age ◽  
Peak Height Velocity ◽  
The Mean ◽  
Injury Burden

Background: The relationship between injury risk (IR) in age groups and periods around peak height velocity (PHV) remains unclear. PHV is defined as the moment of the largest increase in body height. Purpose: To investigate injury risk and injury burden as functions of growth velocity (periods around PHV) and chronological age groupings (under 12 years [U12] to U19) in talented youth male soccer players. Study Design: Cohort study; Level of evidence, 2. Methods: A total of 170 players from the youth academy of a Dutch soccer club (highest professional league: Eredivisie) were observed for 1 to 3 seasons. Injuries, exposure, PHV age, and chronological age were registered. The injury incidence density (IID) and injury burden per 1000 hours of soccer participation, with 95% CIs, were calculated for 5 PHV periods and 7 age groups. These were compared with the overall cohort results using incidence ratios (IRs) and burden ratios (BRs) with 95% CIs. Results: The mean age at PHV was 14.4 ± 0.65 years (range, 12.8-16.5 years). The mean IID for the total cohort was 8.34 injuries per 1000 hours (95% CI, 7.71-9.02). Compared with the overall mean, a significantly higher IID was found for PHV period 4+5 (IR, 1.31 [95% CI, 1.00-1.71]; P = .049) and for the U15 group (IR, 1.49 [95% CI, 1.24-1.79]; P < .001). The overall injury burden was 58.37 injury days per 1000 hours (95% CI, 56.66-60.13). In PHV period 4+5, the injury burden was significantly higher (BR, 1.53 [95% CI, 1.39-1.68]; P < .001) when compared with the overall mean. Also, compared with the overall mean, the injury burden was higher in the U16 (BR, 1.48 [95% CI, 1.39-1.58]; P < .001), U15 (BR, 1.28 [95% CI, 1.19-1.38]; P < .001), and U17 groups (BR, 1.21 [95% CI, 1.13-1.31]; P < .001). Conclusion: Talented young soccer players were more prone to injuries during the 6 months after PHV (31% above overall mean) as well as in the U15 group (49% above overall mean). Based on the higher injury burden in the U16 (48%), U15 (28%), and U17 (21%) groups, we suggest that research on injury risk factors and preventive measures should primarily target these age groups. Additional interventions based on PHV may be of limited value from a screening perspective. Further research is needed on the interaction between age groups and PHV periods.

scholarly journals Musculoskeletal Screening Tests and Bony Hip Morphology Cannot Identify Male Professional Soccer Players at Risk of Groin Injuries: A 2-Year Prospective Cohort Study

2018 ◽  
Vol 46 (6) ◽  
pp. 1294-1305 ◽  
Author(s):  
Andrea B. Mosler ◽  
Adam Weir ◽  
Andreas Serner ◽  
Rintje Agricola ◽  
Cristiano Eirale ◽  
...  
Keyword(s):  
At Risk ◽  
Groin Pain ◽  
Soccer Players ◽  
Screening Tests ◽  
Radiographic Examination ◽  
Match Play ◽  
Professional Soccer ◽  
Hip Morphology ◽  
Increased Risk ◽  
The Mean

Background: Musculoskeletal hip/groin screening tests are commonly performed to detect at-risk individuals. Bony hip morphology is considered a potential intrinsic risk factor but has not been examined prospectively. Purpose: To evaluate the association between intrinsic risk factors identified from musculoskeletal and radiographic screening tests and hip/groin injuries leading to time loss from training and/or match play in professional male soccer players. Study Design: Prospective cohort study; Level of evidence, 2. Methods: Male professional soccer players, aged ≥18 years, underwent screening specific for hip/groin pain during 2 consecutive seasons of the Qatar Stars League. The screening battery included pain provocation, range of motion, and strength tests as well as a hip radiographic examination. The radiographic examination included an anteroposterior pelvic view and 45° Dunn view, with bony hip morphology determined using quantitative methods. Time-loss (≥1 day) hip/groin injuries and individual player exposure (training and match play) were recorded prospectively, and injuries were categorized as adductor-related, inguinal-related, iliopsoas-related, pubic-related, or hip-related groin pain, or “other,” as recommended in the Doha agreement. We calculated hazard ratios (HRs) from univariate and multivariate Cox regression models to assess the relationship between potential risk factors and hip/groin injuries. Results: There were 438 players, completing 609 player seasons, and 113 hip/groin injuries that met the criteria for inclusion, with 85 injuries categorized as adductor-related. The proportion of players with bony morphological variants was the following: cam, 71%; pincer, 5%; and acetabular dysplasia, 13%. Previous hip/groin injuries (HR, 1.8; 95% CI, 1.2-2.7) and eccentric adduction strength were associated with the risk of hip/groin injuries. Higher (>1 SD above the mean) than normal eccentric adduction strength was associated with an increased risk for all hip/groin injuries (HR, 1.6; 95% CI, 1.0-2.5). Lower (<1 SD below the mean) than normal eccentric adduction strength was associated with an increased risk for adductor-related injuries (HR, 1.7; 95% CI, 1.0-3.0). No other musculoskeletal screening test or bony hip morphology variables were associated with the injury risk. Conclusion: Previous groin injuries and eccentric adduction strength were associated with the risk of groin injuries. However, these associations were not strong enough to identify an “at-risk” individual, and therefore, musculoskeletal screening tests were not useful to dictate individualized prevention strategies. Bony hip morphology was not associated with the risk of groin injuries.

P14.67 Long-term results of gamma knife radiosurgery for treatment of intracranial glomus jugulare tumors

2021 ◽  
Vol 23 (Supplement_2) ◽  
pp. ii50-ii51
Author(s):  
R M Emad Eldin ◽  
K M Abdel Karim ◽  
A M N El-Shehaby ◽  
W A Reda ◽  
A M Nabeel ◽  
...  
Keyword(s):  
Clinical Improvement ◽  
Gamma Knife ◽  
Tumor Volume ◽  
Gamma Knife Radiosurgery ◽  
Long Term Results ◽  
Glomus Jugulare ◽  
The Mean ◽  
Mean Time

Abstract BACKGROUND Glomus Jugulare tumors are benign but locally aggressive ones that represent a therapeutic challenge. Previous studies about the use of Gamma Knife Radiosurgery (GRS) in those tumors have documented good results that needed larger number of patients and longer follow up periods to be confirmed. MATERIAL AND METHODS Between August 2001 and December 2017, 70 patients with glomus jugulare tumors were treated at the Gamma Knife Center, Cairo. They were 46 females and 24 males. The mean age was 48 years (16–71 years). Nineteen of these patients were previously operated, 5 were partially embolized, 3 underwent embolization and subsequent surgery and 43 had gamma knife as their primary treatment. Volume-staged gamma knife radiosurgery was used in 10 patients and single-session in 60 patients, with a total of 86 sessions. The mean target volume was 12.7 cm3 (range 0.2 to 34.5 cm3). The mean tumor volume was 15.5 cm3 (range 0.2 to 105 cm3). The mean prescription dose was 14.5 Gy (range 12 to 18 Gy). RESULTS The mean follow up period was 60 months (range 18 to 206 months), and by the time of the data analysis, two of the patients were dead (66 and 24 months after GK treatment). The tumor control was 98.6% (69/70). Thirty-two tumors became smaller and 37 were unchanged. The symptoms improved in 36 patients, were stable in 32 patients, and worsened in 2 patients who developed a transient facial palsy and worsened hearing. Symptomatic improvement began before any reduction in tumor volume could be detected, where the mean time to clinical improvement was 7 months whereas the mean time to tumor shrinkage was 18 months. CONCLUSION This study about the long term follow up of the GKR for the intracranial glomus jugulare tumors confirmed that this is a highly effective and safe treatment. This data shows that the clinical improvement is not correlated with the radiological volume reduction.

scholarly journals Training duration may not be a predisposing factor in potential maladaptations in talent development programmes that promote early specialisation in elite youth soccer

2018 ◽  
Vol 13 (5) ◽  
pp. 674-678 ◽  
Author(s):  
Thomas E Brownlee ◽  
Andy O’Boyle ◽  
Ryland Morgans ◽  
James P Morton ◽  
Robert M Erskine ◽  
...  
Keyword(s):  
Resistance Training ◽  
Body Mass ◽  
Age Groups ◽  
Talent Development ◽  
Soccer Players ◽  
Predisposing Factor ◽  
Match Play ◽  
Training Time ◽  
Youth Soccer ◽  
Soccer Training

Purpose To determine whether training duration is a predisposing factor in potential maladaptations in talent development programmes that promote early specialisation in elite youth soccer. Methods Training times and type of 184 elite soccer players, from the under-9 to under-21 age groups (age 9.4 to 18.4 yrs; stature 1.38 to 1.82 m; body mass 32.2 to 76.2 kg) were recorded. Results Total training time progressively increased between the under-9 (268 ± 25 min/week) and under-14 (477 ± 19 min/week) groups with the majority of training time (96.5 ± 3.9%) consisting of soccer training and matches. Total training time then subsequently reduced from under-14 to under-15 (266 ± 77 min/week) groups, with no differences in training time between under-15 and under-21. Only under-15 to under-21 players completed resistance training; this inclusion coincided with a reduction in soccer training and match play when compared to time spent in these activities for younger groups (73.8 ± 3.2% of total training). Conclusion Data suggest that although the majority of training is focused on technical development, the training duration as a whole is unlikely to contribute to potential maladaptations in talent development programmes in elite youth soccer.

Trends in match injury risk in professional male rugby union: a 16-season review of 10 851 match injuries in the English Premiership (2002–2019): the Professional Rugby Injury Surveillance Project

2020 ◽  
pp. bjsports-2020-102529
Author(s):  
Stephen W West ◽  
Lindsay Starling ◽  
Simon Kemp ◽  
Sean Williams ◽  
Matthew Cross ◽  
...  
Keyword(s):  
Injury Risk ◽  
Injury Severity ◽  
Rugby Union ◽  
Injury Surveillance ◽  
Injury Incidence ◽  
Match Play ◽  
Common Activity ◽  
Long Term Trends ◽  
The Mean

ObjectivesThe Professional Rugby Injury Surveillance Project is the largest and longest running rugby union injury surveillance project globally and focuses on the highest level of rugby in England.MethodsWe examined match injuries in professional men’s rugby over the period 2002/2003 to 2018/2019 and described trends in injuries over this time.ResultsOver the period 2002/2003–2018/2019, 10 851 injuries occurred in 1 24 952 hours of match play, equating to a mean of 57 injuries per club per season and one injury per team per match. The mean incidence, severity (days absence) and burden (days absence/1000 hours) of injury were 87/1000 hours (95% CI 82 to 92), 25 days (95% CI 22 to 28) and 2178 days/1000 hours (95% CI 1872 to 2484), respectively. The tackle accounted for 43% injuries with running the second most common activity during injury (12%). The most common injury location was the head/face with an incidence of 11.3/1000 hours, while the location with the highest overall burden was the knee (11.1 days/1000 hours). Long-term trends demonstrated stable injury incidence and proportion of injured players, but an increase in the mean and median severity of injuries. Concussion incidence, severity and burden increased from the 2009/2010 season onwards and from 2011 to 2019 concussion was the most common injury.ConclusionThe rise in overall injury severity and concussion incidence are the most significant findings from this work and demonstrate the need for continued efforts to reduce concussion risk as well as a greater understanding of changes in injury severity over time.

The use of deslorelin implants for the long-term contraception of lionesses and tigers

2008 ◽  
Vol 35 (6) ◽  
pp. 525 ◽  
Author(s):  
H. J. Bertschinger ◽  
M. A. de Barros Vaz Guimarães ◽  
T. E. Trigg ◽  
A. Human
Keyword(s):  
South Africa ◽  
Effective Means ◽  
Panthera Leo ◽  
Ovarian Activity ◽  
Panthera Tigris ◽  
Field Observations ◽  
The Mean ◽  
Free Ranging ◽  
Mean Time

Contraception is an essential tool for controlling reproduction in captive and free-ranging lions. This paper describes the treatment and contraception of 23 captive and 40 free-ranging lionesses (Panthera leo) and four captive tigers (Panthera tigris) in South Africa using 3 × 4.7 mg, 2 × 4.7 mg, 9.4 mg or 4.7 + 9.4 mg deslorelin implants. Thirty-one lionesses were treated more than once at 11- to 60-month intervals. In Brazil, two lionesses were treated with 9.4-mg implants and faecal progesterone and oestradiol concentrations were monitored for 920 days. All combinations of deslorelin showed the length of contraception to be around 30 months with one 3 × 4.7 mg treatment lasting 40 months in one captive lioness. The mean time taken to reconception was 30.1 months for the 3 × 4.7 mg combination. The faecal analyses of the lionesses in Brazil reflected quiescent ovarian activity for periods of 17 and 30 months, respectively, when small oestradiol peaks but no progesterone peaks started to appear. This confirmed the field observations in South Africa. No side effects occurred although several of the lionesses were treated repeatedly for up to 8 years. Deslorelin (Suprelorin) is a safe and effective means of controlling reproduction in captive or free-ranging populations of lions. Where contraception is to be maintained, the implementation of implants at 24-month intervals is recommended.

Percutaneous Fasciotomy for Dupuytren’s Contracture

1997 ◽  
Vol 22 (4) ◽  
pp. 521-522 ◽  
Author(s):  
R. A. DUTHIE ◽  
R. B. CHESNEY
Keyword(s):  
Long Term Results ◽  
Dupuytren’S Contracture ◽  
Dupuytren's Contracture ◽  
The Mean ◽  
Mean Time ◽  
Palmar Skin

Percutaneous fasciotomy has long been established as a treatment for Dupuytren’s contracture. There have been no studies to date of the long-term results of this procedure. We followed up a group of 82 patients 10 years after operation in 1981 and 1982. Thirty-four per cent had had no further surgery. The mean time to further surgery in the rest was 60.4 months. Splitting of the palmar skin which healed with regular dressings occurred in three cases. No other complications were noted. Percutaneous fasciotomy can produce lasting improvement in patients with Dupuytren’s contracture and still has an important role in their overall management.

scholarly journals Clinical features and outcomes of bowel perforation in primary pediatric gastrointestinal lymphoma

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Jiayu Yan ◽  
Yanlong Duan ◽  
Tingting Liu ◽  
Jianlin Guo ◽  
Chunhui Peng ◽  
...  
Keyword(s):  
Conservative Treatment ◽  
Bowel Perforation ◽  
Outpatient Department ◽  
Gastrointestinal Lymphoma ◽  
Long Term Follow Up ◽  
The Mean ◽  
Mean Time ◽  
Prompt Diagnosis

Abstract Background Whether surgery can improve the prognosis of patients with primary pediatric gastrointestinal lymphoma (PPGL) who experienced bowel perforation remains controversial. This study aimed to evaluate the prognosis of such patients. Methods Nine patients pathologically diagnosed with PPGL who experienced perforation at our center between January 2010 and December 2020 were enrolled and divided into two groups: those with perforation during (n = 4) and before (n = 5) chemotherapy. Their medical records were reviewed, and long-term follow-up was conducted by telephone in February 2021. Results All patients with perforation during chemotherapy were diagnosed with PPGL in the outpatient department. The mean time from outpatient visit to chemotherapy was 17.3 ± 6.1 days. Two patients experienced perforation during the first chemotherapy regimen and received conservative treatment, while the others developed perforation after multiple chemotherapy regimens and underwent surgery. All of the patients received regular chemotherapy and survived for a mean follow-up time of 3.8 ± 1.9 years. No patient with perforation before chemotherapy had a definite diagnosis in the outpatient department. Among these patients, 4 experienced perforation and underwent surgery, of whom 3 developed perforation-related complications and died; the other recurred after chemotherapy. Only the patient who received conservative treatment was diagnosed with PPGL before chemotherapy, received regular chemotherapy, and survived without a recurrence for 1.0 year. Conclusion Prompt diagnosis and chemotherapy improve the prognosis of PPGL. Surgery does not affect the prognosis of patients with perforation during chemotherapy but may accelerate disease progression in patients with perforation before chemotherapy.

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