scholarly journals Demographic, physiological, psychological, and on-ice performance indicators predict plus/minus status of recreational ice hockey players across a season

2020 ◽  
Vol 50 (4) ◽  
pp. 463-469
Author(s):  
Claudio R. Nigg ◽  
Andreas Gessner ◽  
Carina Nigg ◽  
Marco Giurgiu ◽  
Rainer Neumann
Keyword(s):  
Performance Indicators ◽  
Small Sample Size ◽  
Small Sample ◽  
Ice Hockey ◽  
Medium Size ◽  
Recreational Athletes ◽  
Psychological Indicators ◽  
Hockey Players ◽  
Task Cohesion ◽  
Positive Correlations

Abstract Little is known about physical, physiological, and psychological performance indicators predicting recreational athletes’ performance. This information may motivate players to become more active and inform coaches where to focus to build confidence, cohesion, and cooperation. This study investigated which performance indicators were related to the plus-minus statistic in German recreational ice hockey players (n = 20 players; 1 female; mean age = 36.25 ± 12.91 years; height = 178.85 ± 8.64 cm; weight = 81.36 ± 12.89 kg; mean years of ice hockey experience = 5.68 ± 8.93) over a season. Anthropometrics, psychological and on-ice performance data were collected mid-season and plus-minus were recorded after each game. Due to the small sample size, significance interpretations are not meaningful; therefore, Cohen’s guidelines were used for r = 0.2 (small), r = 0.5 (medium) and r = 0.8 (large). Medium size positive correlations of plus/minus were found for push-ups (r = 0.52) and squats (r = 0.37). Small positive correlations were found for shot speed (r = 0.33), competitiveness orientation (r = 0.28), and years on team (r = 0.23). Small negative correlations were found for win orientation (r = −0.30), body mass index (r = −0.28), task cohesion (r = −0.24), and percent body fat (r = −0.20). Some performance and psychological indicators are related to recreational ice hockey players’ plus-minus statistic over a season. Coaches and players of recreational teams should focus on muscular strength and endurance, shooting speed, body composition, and enjoying the challenge of competition while lowering their win orientation.

Effects of Use of Prophylactic Knee Orthoses among Ice Hockey Players in Switzerland

2018 ◽  
Vol 66 (1) ◽  
Keyword(s):  
Quantitative Data ◽  
Small Sample Size ◽  
Cruciate Ligament ◽  
Small Sample ◽  
Ice Hockey ◽  
National Study ◽  
Acl Injuries ◽  
Hockey Players ◽  
Anterior Cruciate ◽  
Recurrent Injuries

Introduction: The use of prophylactic knee orthoses is very common among Swiss ice hockey players to prevent recurrent lesions of the medial collateral ligament (MCL) and the anterior cruciate ligament (ACL). However, their effects are still widely discussed in the literature. Purpose of the Study: The purpose of this study is to assess the feasibility of a given protocol (recruitment, resources, data management, surveys...) for a future national study and to present the preliminary results of the prophylactic orthotics effects on recurrent injuries. Methods: Retrospective epidemiological pilot study. Inclusion criteria: all team players of the second and third divisions in Wallis, except for goalkeepers and underage players. Exposure times correspond to the number of played matches, with an estimation of 0.3 hours of actual play time per game. Feasibility was assessed based on criteria previously defined. Recurrent injuries were divided into three groups: (GA: without orthosis; GB: periodic orthosis; GC: permanent orthosis). Quantitative data, incidence of recurrent injuries and incidence ratio were calculated per 1000 hours of game using the Stata® software programme. Results: Four out of five feasibility criteria were fulfilled. Quantitative data shows that 66.2 % of the summoned players (n=80) were present and all of them took part in the study. Twenty-five MCL and ACL injuries (68 % orthosis wearers) have been included, among which 28 % were recurrences. Incidence rate ratio (IRR) of GA on GB=0.153 (p=0.021); GA on GC = 2.34e-08 (p = 0.00). Discussion and conclusion: A national study is feasible by including minor changes. Recurrent injuries can be prevented in a significant way by wearing an orthosis. However, due to the small sample size, these results must be taken with caution.

scholarly journals Fainter harder brighter softer: a correlation between αox, X-ray spectral state, and Eddington ratio in tidal disruption events

2020 ◽  
Vol 497 (1) ◽  
pp. L1-L6
Author(s):  
Thomas Wevers
Keyword(s):  
Small Sample Size ◽  
Galactic Nuclei ◽  
Small Sample ◽  
Tidal Disruption ◽  
X Ray ◽  
Relative Contribution ◽  
Positive Correlations ◽  
Optical Surveys ◽  
X Ray Binaries ◽  
Mass Functions

Abstract We explore the accretion states of tidal disruption events (TDEs) using a sample of seven X-ray bright sources. To this end, we estimate the relative contribution of the disc and corona to the observed X-ray emission through spectral modelling, and assess the X-ray brightness (through αox, L$_{2\ \rm keV}$, and fEdd,X) as a function of the Eddington ratio. We report strong positive correlations between αox and fEdd,bol; fEdd,X and fEdd,UV; and an anticorrelation for L$_{2\ \rm keV}$ and fEdd,UV. TDEs at high fEdd,bol have thermal dominated X-ray spectra and high (soft) αox, whereas those at low fEdd,bol show a significant power-law contribution and low (hard) αox. Similar to X-ray binaries and active galactic nuclei, the transition between X-ray spectral states occurs around fEdd,bol ≈ 0.03, although the uncertainty is large due to the small sample size. Our results suggest that X-ray surveys are more likely to discover TDEs at low fEdd,bol, whereas optical surveys are more sensitive to TDEs at high Eddington ratios. The X-ray and optical selected TDEs have different UV and X-ray properties, which should be taken into account when deriving rates, luminosity, and black hole mass functions.

scholarly journals Bench behaviour of ice hockey coaches: Psychophysiological and verbal responses to critical game incidents

2017 ◽  
Vol 12 (3) ◽  
pp. 303-311 ◽  
Author(s):  
Michael D Kennedy ◽  
Camilla J Knight
Keyword(s):  
Heart Rate ◽  
Sample Size ◽  
Critical Incident ◽  
Critical Incidents ◽  
Small Sample Size ◽  
Team Sports ◽  
Small Sample ◽  
Ice Hockey ◽  
Assessment System ◽  
Verbal Responses

The purpose of this study was to examine coaches’ psychophysiological and verbal responses to different game situations. The in-game heart rate and verbal responses of three elite ice hockey coaches to four critical game incidents (Goals For/Against; Penalties Taken/Drawn) over four university women’s games were assessed. Verbal comments were categorised using the Coach Behaviour Assessment System, and then comments and heart rate were sequenced to critical incidents recorded on video review. Overall, in-game heart rate was greater than rest and coaches were rarely silent. General encouragement and general commentary were the most common verbal comments. Two hundred and eight critical incident comments were recorded (Goals For/Against 34.6 %; Penalties Taken/Drawn 65.4%) associated with a 10 bpm greater heart rate. Most common verbal responses to critical incidents were general commentary, silence and organisation. The type of comment was affected by the type of critical incident. In 78% of critical incidents, the type of comment made before incidents differed to type of comment after the incident, coaches rarely talked at the same time and silence was common. These novel findings are limited to ice hockey coaches given the small sample size. However, these results should encourage more research into the psychophysiological and verbal responses of coaches in other team sports real game situations to better understand in game coaching behaviour.

Cohesion Predicts Success in Junior Ice Hockey

1998 ◽  
Vol 87 (2) ◽  
pp. 649-650 ◽  
Author(s):  
Simo Salminen ◽  
Pekka Luhtanen
Keyword(s):  
Social Cohesion ◽  
Ice Hockey ◽  
Predictors Of Success ◽  
Winning Percentage ◽  
Hockey Players ◽  
Group Environment ◽  
Task Cohesion ◽  
Group Environment Questionnaire ◽  
The Relationship

This study examined the relationship between cohesion measured by the Group Environment Questionnaire and success measured by winning percentage with over 200 junior ice hockey players. The cohesion explained 29% of the variance of the success. Scores on task cohesion were better predictors of success than social cohesion.

scholarly journals Early Diagnosis of Canine Hip Laxity: Correlation between Clinical Orthopedic Examinations and the FCI Scoring Method in a Closed Cohort of Rottweilers

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 416
Author(s):  
Britta Vidoni ◽  
Veronika Bauer ◽  
Barbara Bockstahler ◽  
Michaela Gumpenberger ◽  
Alexander Tichy ◽  
...  
Keyword(s):  
Early Diagnosis ◽  
Small Sample Size ◽  
Small Animal ◽  
Small Sample ◽  
Scoring Method ◽  
Angle Measurements ◽  
Examination Time ◽  
Breed Differences ◽  
Positive Correlations ◽  
Canine Hip Dysplasia

Canine hip dysplasia is a multifactorial disorder characterized by hip laxity and osteoarthritis. The early diagnosis of hip laxity is an important topic in small animal orthopedics. This study aimed to evaluate the correlation between clinical orthopedic examinations and the Fédération Cynologique Internationale (FCI) scoring method. Thirty purebred Rottweilers were examined at approximately four (20 ± 2 weeks), eight (35 ± 2 weeks), and twelve months of age (54 ± 1 weeks), respectively. The Ortolani, Barlow, and Bardens tests and reduction/subluxation angle measurements were performed at each time. FCI scoring was conducted at the third examination time. Positive correlations were recorded between the reduction angle and Ortolani test, reduction angle and FCI score, and Ortolani test and FCI score for the second and third examination dates. No correlation was observed between the subluxation angle and other methods. Despite previous studies reporting 16–20 weeks as the earliest age for diagnosing hip laxity in dogs, in our study, early diagnosis was possible from the age of 35 ± 2 weeks. This difference might originate from the small sample size, low number of the dogs with severe grades of laxity, and breed differences.

scholarly journals A Review of Players’ Characterization and Game Performance on Male Rink-Hockey

2020 ◽  
Vol 17 (12) ◽  
pp. 4259
Author(s):  
António Ferraz ◽  
João Valente-Dos-Santos ◽  
Hugo Sarmento ◽  
Pedro Duarte-Mendes ◽  
Bruno Travassos
Keyword(s):  
Body Composition ◽  
English Language ◽  
Small Sample Size ◽  
Small Sample ◽  
Composition Analysis ◽  
Severe Injuries ◽  
Long Duration ◽  
Hockey Players ◽  
Physiological Demands ◽  
Game Performance

The aim of this study was to review the evolutionary tendencies of research regarding to the study of male Rink-Hockey players´ and game performance. A systematic search was conducted in PubMed, Web of Knowledge and Scopus databases according to PRISMA method. The initial search identified 815 titles, resulting in 19 articles being included within the review. Original papers (English language) contained relevant data regarding rink hockey players’ performance or morphological/physiological demands, anthropometry/body composition characteristics were eligible. Studies were classified into categories: (1) Physiological Demands, (2) Anthropometry and Body Composition, (3) Game Characterization/Patterns, (4) Injuries. Results indicated that Rink hockey requires high intensity effort which demands both short and long duration efforts requirements from players. Body composition analysis shows to be an important monitoring tool which complements the understanding of the athlete’s cardiac adaptation. Game patterns shows a combination of specific game momentums with different outcomes according to the game zone. The intense short-term movements, collision and contact between players, in addition to the weight and speed of the hard ball and the stick, can considerably increase the risk of moderate and severe injuries. Lack of literature in Rink-Hockey is remarkable, and research is mainly focused on children and adolescents’ players. Furthermore, the existing research with adult elite athletes was assessed with a small sample size.

Sweat Loss and Hydration Habits of Female Olympic, Varsity and Recreational Ice Hockey Players

2019 ◽  
Vol 40 (06) ◽  
pp. 416-422 ◽  
Author(s):  
Jessica Lynne Bigg ◽  
Alexander Shand Davis Gamble ◽  
Tyler Fredrick Vermeulen ◽  
Stephanie Michelle Boville ◽  
Greg S. Eskedjian ◽  
...  
Keyword(s):  
Fluid Intake ◽  
Sweat Rate ◽  
Ice Hockey ◽  
Sodium Balance ◽  
Sweat Loss ◽  
Total Fluid Intake ◽  
Body Mass Loss ◽  
Recreational Athletes ◽  
Hockey Players ◽  
Total Fluid

AbstractThis study measured sweat losses, voluntary fluid intake, sodium balance, and carbohydrate intake of female ice hockey players during on-ice practices at the Olympic, varsity, and recreational levels. Testing was conducted on 25 Canadian Olympic players, 21 varsity, and 21 recreational players. The average sweat rate for the Olympic players (0.99±0.08 L/h) was significantly greater than both the varsity (0.67±0.05 L/h, p=0.001) and the recreational players (0.42±0.03 L/h, p<0.001), and the varsity players also had a significantly greater sweat rate than the recreational athletes (p=0.016). Total fluid intake was significantly greater for both the Olympic (p=0.001) and varsity players (p=0.007) compared to the recreational group. Only 3 of 25 Olympic players lost>1.5% BM and 4 others lost>1% BM, with no players in both the varsity and recreational teams losing>1% BM. Half of the Olympic players consumed some carbohydrate during practice, but most of the varsity and recreational players did not. In conclusion, sweat rates in female ice hockey players during practices were proportional to competitive level. Fluid intake was similar between groups and resulted in only a few athletes at the Olympic level being at risk of excess body mass loss.

RELATIONSHIPS OF PHYSICAL FITNESS TEST RESULTS AND PLAYER PERFORMANCE INDICATORS IN NATIONAL-LEVEL ICE HOCKEY PLAYERS

2018 ◽  
Vol 4 ◽  
pp. 264-273
Author(s):  
Arkadiusz Jarosław Stanula ◽  
Robert Krzysztof Roczniok ◽  
Tomasz Tytus Gabrys ◽  
Urszula Barbara Szmatlan-Gabrys ◽  
Mariusz Jacek Ozimek
Keyword(s):  
Aerobic Capacity ◽  
Performance Indicators ◽  
Vertical Jump ◽  
National Level ◽  
Ice Hockey ◽  
Oxygen Intake ◽  
Fatigue Index ◽  
Maximal Aerobic Capacity ◽  
Hockey Players ◽  
Player Performance

The aim of the study is to identify the relationships of the results of the physiological and anthropometric tests and special on-ice fitness tests with individual player performance indicators during matches of the Poland men's national ice hockey team played during the U18 Ice Hockey World Championship. A total of 20 hockey players (forwards, n=12 and defensemen, n=8) of the Poland men's national ice hockey team were included in this study. All participants were performed a battery tests including maximal aerobic capacity, Wingate test, Repeated-Skate Sprint test and vertical jump test. Pearson correlations were used to examine any differences in all measures and +/– score. Only the fatigue index calculated from the repeated-skate sprint test was significantly correlated with absolute +/– score (r=0.47, p<0.05). The result of the aerobic capacity test, expressed by means of the oxygen intake value (V̇O2max), despite being statistically insignificant, reached the value of r=0.42. The results of this study suggest that game performance as indicated by the +/– score can be predicted by the fatigue index calculated from the repeated-skate sprint test.

Probing the ultrastructure of the mitotic and meiotic spindle in eggs: An expeditious approach based on semi-thin (0.25 μm) serial sections

1983 ◽  
Vol 41 ◽  
pp. 552-555
Author(s):  
Conly L. Rieder ◽  
S. Bowser ◽  
R. Nowogrodzki ◽  
K. Ross ◽  
G. Sluder
Keyword(s):  
Small Sample Size ◽  
Small Sample ◽  
Meiotic Spindle ◽  
Serial Sections ◽  
Mitotic Apparatus ◽  
Thin Sections ◽  
Cell Cycles ◽  
Ultrastructural Studies

Eggs have long been a favorite material for studying the mechanism of karyokinesis in-vivo and in-vitro. They can be obtained in great numbers and, when fertilized, divide synchronously over many cell cycles. However, they are not considered to be a practical system for ultrastructural studies on the mitotic apparatus (MA) for several reasons, the most obvious of which is that sectioning them is a formidable task: over 1000 ultra-thin sections need to be cut from a single 80-100 μm diameter egg and of these sections only a small percentage will contain the area or structure of interest. Thus it is difficult and time consuming to obtain reliable ultrastructural data concerning the MA of eggs; and when it is obtained it is necessarily based on a small sample size.We have recently developed a procedure which will facilitate many studies concerned with the ultrastructure of the MA in eggs. It is based on the availability of biological HVEM's and on the observation that 0.25 μm thick serial sections can be screened at high resolution for content (after mounting on slot grids and staining with uranyl and lead) by phase contrast light microscopy (LM; Figs 1-2).

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