International matches elicits stable mechanical workload in high-level female ice hockey

Author(s):  
Jérôme Perez ◽  
Franck Brocherie ◽  
Antoine Couturier ◽  
Gaël Guilhem
Keyword(s):  
2018 ◽  
Vol 4 (1) ◽  
pp. e000371 ◽  
Author(s):  
Jonah Hebert-Davies ◽  
Julie Agel

ObjectiveTo determine if return to sport following clavicle fracture occurs earlier in high-level sports than the current standard of care allows for.DesignObservational study retrospective review of NHL prospective data.SettingThe study was performed at a university orthopaedic surgery department.PatientsNHL player with clavicle fracture.Assessment of independent variablesThe independent variable including time on injured reserve and type of treatment.Main outcome measuresThe primary study outcome measure was successful return to NHL play.Results15 athletes were identified; 10 were treated operatively and 5 non-operatively. The average return to ice hockey was 10 weeks. If the one outlier is removed, the average is 9.1 weeks. There was one re-fracture in the non-operative group. The average time from injury to return to sport was 65 days in the operative group and 97.6 days in the non-operative group. Two patients were unable to return play during the same season.ConclusionsHigh-end athletes safely return to at-risk sports after clavicle fracture much sooner than the average seen with non-elite athletes. Additional study may demonstrate that return to activity can likely be accelerated without significantly increasing complications.


Author(s):  
Alexander Andrea Tarnutzer ◽  
Konrad Peter Weber ◽  
Christopher J. Bockisch ◽  
Dominik Straumann ◽  
Nina Feddermann-Demont

Author(s):  
Joel Jackson ◽  
Gary Snydmiller ◽  
Alex Game ◽  
Pierre Gervais ◽  
Gordon Bell

Background:  Men’s university ice hockey has received little scientific attention over the past 30 years, a time in which the traits of the players and the demands of the game have evolved.  Objectives: This study compared the physiological characteristics of university ice hockey players and examined the frequency and duration of the different movement patterns and heart rate (HR) responses during competition. Methods: Twenty male ice hockey players from the same team ( age ± SD = 22±2 years) underwent a fitness evaluation and were filmed and HR monitored during regular season games. Results: Forwards and defense had similar fitness and only differed on % fatigue index and peak heart during on-ice sprinting (P<0.05). Defense stood, glided and skated backwards more than forwards and forwards skated at a moderate intensity and glided forward more than defense (P<0.05). All players spent the majority of game time gliding forward (60% of the time) followed by skating forward at a moderate intensity (17%) and standing with little movement (9%). Average HR during the game reached 96 and 92 % and peak HR was 100 and 96 % of maximum in forwards and defense, respectively. Conclusions: Male university hockey players present with a high level of physical fitness in a variety of categories with few differences between forwards and defense. Movement patterns during games suggest that players are performing low to moderate intensity on-ice activities the majority of the time. Paradoxically, HR continues to climb to near maximum during on ice shifts.


Author(s):  
Montse C. Ruiz ◽  
Reko Luojumäki ◽  
Samppa Karvinen ◽  
Laura Bortoli ◽  
Claudio Robazza

The purpose of the study was to examine the validity of core action elements and feeling states in ice hockey players in the prediction of performance. A second aim of the study was to explore the effectiveness of a 30-day program targeting action and emotion regulation. Participants were male ice hockey players drawn from two teams competing at the highest level of the junior Finnish ice hockey league. They were assigned to a self-regulation (n = 24) and a control (n = 19) group. The self-regulation program focused on the recreation of optimal execution of core action elements and functional feeling states. Separate repeated measures MANOVAs indicated significant differences in ratings of perceived control and execution accuracy ratings of self-selected visual and behavioral components of the action (critical for optimal performance) and psychobiosocial (feeling) states across recalled best and worst games. Results support the use of both action- and emotion-centered strategies for performance enhancement. Future research including psychophysiological markers is warranted.


2021 ◽  
Vol 9 (3) ◽  
pp. 232596712098168
Author(s):  
Ida Lindman ◽  
Josefin Abrahamsson ◽  
Axel Öhlin ◽  
Tobias Wörner ◽  
Frida Eek ◽  
...  

Background: Ice hockey players often undergo arthroscopic treatment for femoroacetabular impingement syndrome (FAIS); however, only a few studies have reported postoperative patient-reported outcomes. It has been debated whether player position is related to FAIS. Purpose: To evaluate the change in patient-reported outcome measures (PROMs) in high-level ice hockey players from presurgery to 2 years after arthroscopic treatment for FAIS. The secondary aim was to evaluate differences in outcomes among player positions and whether stick handedness is related to the side of the symptomatic hip. Study Design: Case series; Level of evidence, 4. Methods: Ice hockey players undergoing treatment for FAIS between 2011 and 2019 were prospectively included. Preoperative and 2-year follow-up scores were collected for the following PROMs: HAGOS (Copenhagen Hip and Groin Outcome Score), iHOT-12 (12-item International Hip Outcome Tool), EQ-5D (EuroQol–5 Dimensions) and EQ-VAS (EuroQol–Visual Analog Scale), Hip Sports Activity Scale, and visual analog scale for overall hip function. Player position and stick handedness were collected from public sources. Preoperative and follow-up outcomes were compared for the entire cohort and among player positions. Results: The cohort included 172 ice hockey players with a mean age of 28 years, a mean body mass index of 25.6, and a mean symptom duration of 46.3 months. In the 120 players with 2-year follow-up data, there was significant improvement in all PROMs as compared with presurgery: HAGOS subscales (symptoms, 47.5 vs 68.0; pain, 57.0 vs 75.8; activities of daily living, 62.5 vs 81.0; sports, 40.0 vs 64.7; physical activity, 30.9 vs 57.2; quality of life, 32.5 vs 57.8), iHOT-12 (45.2 vs 66.7), EQ-5D (0.59 vs 0.75), EQ-VAS (68.3 vs 73.2), and visual analog scale for overall hip function (49.6 vs 69.2) ( P < .0001 for all). At 2-year follow-up, 83% reported satisfaction with the procedure. There was no difference in the improvement in PROMs among player positions. Further, there was no significant relationship between stick handedness and side of symptomatic hip; however, because of the number of bilateral procedures and large number of left-handed shooters, no conclusions could be drawn. Conclusion: High-level ice hockey players undergoing arthroscopic treatment for FAIS reported improvements in PROMs 2 years after surgery, regardless of player position.


2017 ◽  
Vol 12 (7) ◽  
pp. 893-900 ◽  
Author(s):  
Torstein E. Dæhlin ◽  
Ole C. Haugen ◽  
Simen Haugerud ◽  
Ivana Hollan ◽  
Truls Raastad ◽  
...  

Background:Combined plyometric and strength training has previously been suggested as a strategy to improve skating performance in ice hockey players. However, the effects of combined plyometric and strength training have not previously been compared with the effects of strength training only.Purpose:To compare the effects of combined plyometric and strength training on ice hockey players’ skating sprint performance with those of strength training only.Methods:Eighteen participants were randomly assigned to 2 groups that completed 5 strength-training sessions/wk for 8 wk. One group included plyometric exercises at the start of 3 sessions/wk (PLY+ST), and the other group included core exercises in the same sessions (ST). Tests of 10- and 35-m skating sprints, horizontal jumping, 1-repetition-maximum (1 RM) squat, skating multistage aerobic test (SMAT), maximal oxygen consumption, repeated cycle sprints, and body composition were performed before and after the intervention.Results:The participants increased their 1RM squat, lean mass, and body mass (P < .05), with no difference between the groups. Furthermore, they improved their 3×broad jump, repeated cycle sprint, and SMAT performance (P < .05), with no difference between the groups. PLY+ST gained a larger improvement in 10-m on-ice sprint performance than ST (P < .025).Conclusion:Combining plyometric and strength training for 8 wk was superior to strength training alone at improving 10-m on-ice sprint performance in high-level ice hockey players.


Author(s):  
Marius Trandafir ◽  
Lorand Balint

Sports training is a long-lasting complex process, organized according to the level of performance and the proposed competitive objective. The study aims at highlighting the planning aspects of the sports training in the preparation of ice hockey players. Training planning is organized according to the team's performance level and the targeted result, thus, it can be classified as follows: stage one, anatomical adaptation, stage two, pre-competition stage, competition stage and the transitional stage. The content of each stage is structured and distributed based on the type of effort specific to the hockey game and the main parameters of effort (volume, intensity, complexity). The research methods used for the elaboration of the study are: the study of specialized literature and the pedagogical observation. Sports training is a pedagogical process, which implies compliance with basic principles that ensure the achievement of the established sporting performance, when the methods and means of training are well chosen, adapted and individualised according to the player's bio-mental-physical abilities and his background on the position in the team.In conclusion, in the course of the sports training process, the physical, physiological, mental and intellectual potential of the sportsman will be improved, through planning and periodization elements, which ensure the achievement of high-level sports performance.


Author(s):  
David P. Bazett-Jones ◽  
Mark L. Brown

A multisubunit RNA polymerase enzyme is ultimately responsible for transcription initiation and elongation of RNA, but recognition of the proper start site by the enzyme is regulated by general, temporal and gene-specific trans-factors interacting at promoter and enhancer DNA sequences. To understand the molecular mechanisms which precisely regulate the transcription initiation event, it is crucial to elucidate the structure of the transcription factor/DNA complexes involved. Electron spectroscopic imaging (ESI) provides the opportunity to visualize individual DNA molecules. Enhancement of DNA contrast with ESI is accomplished by imaging with electrons that have interacted with inner shell electrons of phosphorus in the DNA backbone. Phosphorus detection at this intermediately high level of resolution (≈lnm) permits selective imaging of the DNA, to determine whether the protein factors compact, bend or wrap the DNA. Simultaneously, mass analysis and phosphorus content can be measured quantitatively, using adjacent DNA or tobacco mosaic virus (TMV) as mass and phosphorus standards. These two parameters provide stoichiometric information relating the ratios of protein:DNA content.


Author(s):  
J. S. Wall

The forte of the Scanning transmission Electron Microscope (STEM) is high resolution imaging with high contrast on thin specimens, as demonstrated by visualization of single heavy atoms. of equal importance for biology is the efficient utilization of all available signals, permitting low dose imaging of unstained single molecules such as DNA.Our work at Brookhaven has concentrated on: 1) design and construction of instruments optimized for a narrow range of biological applications and 2) use of such instruments in a very active user/collaborator program. Therefore our program is highly interactive with a strong emphasis on producing results which are interpretable with a high level of confidence.The major challenge we face at the moment is specimen preparation. The resolution of the STEM is better than 2.5 A, but measurements of resolution vs. dose level off at a resolution of 20 A at a dose of 10 el/A2 on a well-behaved biological specimen such as TMV (tobacco mosaic virus). To track down this problem we are examining all aspects of specimen preparation: purification of biological material, deposition on the thin film substrate, washing, fast freezing and freeze drying. As we attempt to improve our equipment/technique, we use image analysis of TMV internal controls included in all STEM samples as a monitor sensitive enough to detect even a few percent improvement. For delicate specimens, carbon films can be very harsh-leading to disruption of the sample. Therefore we are developing conducting polymer films as alternative substrates, as described elsewhere in these Proceedings. For specimen preparation studies, we have identified (from our user/collaborator program ) a variety of “canary” specimens, each uniquely sensitive to one particular aspect of sample preparation, so we can attempt to separate the variables involved.


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