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https://www.readbyqxmd.com/read/29035988/helmet-use-and-risk-taking-behavior-among-skiers-and-snowboarders
#1
Stuart E Willick, Graham Wagner, Don Ericson, George Josten, Masaru Teramoto, Jeremy Davis
OBJECTIVE: To characterize factors associated with helmet use and risk-taking behavior among recreational skiers and snowboarders. DESIGN: Observational study. SETTING: Large, western United States mountain resort. PARTICIPANTS: 1285 male and female recreational skiers and snowboarders were interviewed during a single winter ski season. INDEPENDENT VARIABLES: Helmet use, demographic, and sport-related characteristics...
October 10, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29024041/strength-training-improves-double-poling-performance-after-prolonged-submaximal-exercise-in-cross-country-skiers
#2
S Øfsteng, Ø Sandbakk, M van Beekvelt, D Hammarström, R Kristoffersen, J Hansen, G Paulsen, B R Rønnestad
The purpose of this study was to investigate the effects of adding strength training with or without vibration to cross-country (XC) skiers' endurance training on double poling (DP) performance, physiological and kinematic adaptations. Twenty-one well-trained male XC skiers combined endurance- and upper-body strength-training three times per week, either with (n=11) or without (n=10) superimposed vibrations for 8 weeks, whereas eight skiers performed endurance training only (CON). Testing included 1RM in upper-body exercises, work economy, neural activation, oxygen saturation in muscle and DP kinematics during a prolonged submaximal DP roller ski test which was directly followed by a time to exhaustion (TTE) test...
October 10, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29018351/upper-body-muscular-endurance-training-improves-performance-following-50-min-of-double-poling-in-well-trained-cross-country-skiers
#3
Jørgen Børve, Steffen N Jevne, Bjarne Rud, Thomas Losnegard
This study investigated the effect of muscular endurance training on O2-cost and performance in double poling (DP) on a rollerski treadmill. Twenty-two well-trained cross-country skiers (31 ± 4 years, 77 ± 9 kg, 181 ± 8 cm, VO2max running: 64 ± 5 mL·kg(-1)·min(-1)) were counter-balanced to either a combined muscular endurance and running interval training group [MET; n = 11 (♂ = 9, ♀ = 2)], or an endurance running interval training group [ET; n = 11 (♂ = 9, ♀ = 2)]. Both groups continued their normal low-and moderate intensity training, but replaced 2 weekly high intensity-training sessions with two project-specific sessions for 6 weeks...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28958714/the-spectrum-of-pediatric-injuries-sustained-in-snow-sports
#4
Zara Summers, Warwick J Teague, John M Hutson, Cameron S Palmer, Helen E Jowett, Sebastian K King
BACKGROUND: Snow sports are popular among children but carry the potential for significant injury. Head injuries are less common than fractures and sprains but may be fatal. Helmets are recommended for all snow sports, and yet their effectiveness remains unknown. We aimed to evaluate the spectrum of injuries sustained at three large alpine resorts and to assess the effect of helmet usage on injury severity. METHODS: We performed a retrospective analysis of prospectively collected pediatric trauma data (2005-2015) from the three largest alpine resorts in our state...
September 4, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28950695/pacing-profiles-in-age-group-cross-country-skiers-in-the-vasaloppet-2012-2016
#5
Pantelis T. Nikolaidis, Beat Knechtle
Little is known for pacing profiles in age groups cross-country skiers and the aim of the present study was to examine the effect of sex, age and calendar year on pacing strategies in the largest ski marathon in the world. All finishers (n = 66,435) in ‘Vasaloppet’ from 2012 to 2016 were examined for 12 different age groups (G). There was an association between age group and sex (χ² = 1091.1, P < 0.001; Cramer’s V = 0.13, P < 0.001), where the men-to-women ratio in each age group ranged from 3...
October 31, 2017: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/28912656/do-maximal-roller-skiing-speed-and-double-poling-performance-predict-youth-cross-country-skiing-performance
#6
Roland Stöggl, Erich Müller, Thomas Stöggl
The aims of the current study were to analyze whether specific roller skiing tests and cycle length are determinants of youth cross-country (XC) skiing performance, and to evaluate sex specific differences by applying non-invasive diagnostics. Forty-nine young XC skiers (33 boys; 13.8 ± 0.6 yrs and 16 girls; 13.4 ± 0.9 yrs) performed roller skiing tests consisting of both shorter (50 m) and longer durations (575 m). Test results were correlated with on snow XC skiing performance (PXC) based on 3 skating and 3 classical distance competitions (3 to 6 km)...
September 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28904979/the-russians-are-the-fastest-in-marathon-cross-country-skiing-the-engadin-ski-marathon
#7
Pantelis Theodoros Nikolaidis, Jan Heller, Beat Knechtle
It is well known that athletes from a specific region or country are dominating certain sports disciplines such as marathon running or Ironman triathlon; however, little relevant information exists on cross-country skiing. Therefore, the aim of the present study was to investigate the aspect of region and nationality in one of the largest cross-country skiing marathons in Europe, the "Engadin Ski Marathon." All athletes (n = 197,125) who finished the "Engadin Ski Marathon" between 1998 and 2016 were considered...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28901201/sex-differences-in-balance-among-alpine-ski-racers-cross-sectional-age-comparisons
#8
Christian Raschner, Carolin Hildebrandt, Johanna Mohr, Lisa Müller
Although balance is a key ability in the strength demands of alpine ski racing, affecting both performance and injury prevention, few studies have examined balance or related sex differences among still-maturing athletes. In this 10-year study, we investigated cross-sectional balance performances at different age periods of a representative sample of over 500 11-18-year-old elite skiers of both genders. Participants performed balance tests using the MFT S3-Check. Left-right and forward-backward movements were used to calculate sensory and symmetry balance scores, which were both incorporated into a stability score...
January 1, 2017: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/28872385/new-records-in-human-power
#9
Thomas Haugen, Gøran Paulsen, Stephen Seiler, Øyvind Sandbakk
Maximal aerobic and anaerobic power are crucial performance determinants in most sports disciplines. Numerous studies have published power data from elite athletes over the years, particularly in runners, cyclists, rowers and cross-country skiers. In this invited review, we define the current "world records" in human upper limits of aerobic and anaerobic power. Currently, V̇O2max values of ~7.5 and 7.0 L·min(-1) in male cross-country (XC) skiers and rowers, respectively, and/or ~90 ml·kg(-1)·min(-1) in XC skiers, cyclists and runners can be described as upper human limits for aerobic power...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28852408/prevalence-of-rhinitis-in-athletes-systematic-review
#10
REVIEW
Pavol Surda, Abigail Walker, Matus Putala, Pavel Siarnik
BACKGROUND: Prevalence of rhinitis in athletes has frequently been studied and varies widely from 27% to 74%. The aim of this systematic review was to examine the prevalence of rhinitis in athletes, to specifically compare the evidence of rhinitis in land-based and aquatic athletes. METHODS: Systematic search of MEDLINE, EMBASE, and the non-MEDLINE subset of PubMed was performed from inception to March 8, 2016, to identify studies on rhinitis in athletes. RESULTS: Of the 373 identified unique articles, a total of 13 studies satisfied the criteria for this review...
2017: International Journal of Otolaryngology
https://www.readbyqxmd.com/read/28846855/expert-non-expert-differences-in-visual-behaviour-during-alpine-slalom-skiing
#11
Marjolein Decroix, Mohd Rozilee Wazir Norjali Wazir, Linus Zeuwts, Frederik F J A Deconinck, Matthieu Lenoir, Pieter Vansteenkiste
The aim of this study was to investigate visual behaviour of expert and non-expert ski athletes during an alpine slalom. Fourteen non-experts and five expert slalom skiers completed an alpine slalom course in an indoor ski slope while wearing a head-mounted eye tracking device. Experts completed the slalom clearly faster than non-experts, but no significant difference was found in timing and position of the turn initiation. Although both groups already looked at future obstacles approximately 0,5s before passing the upcoming pole, the higher speed of experts implied that they shifted gaze spatially earlier in the bend than non-experts...
August 25, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28840322/functional-significance-of-extent-and-timing-of-muscle-activation-during-double-poling-on-snow-with-increasing-speed
#12
Chiara Zoppirolli, Gennaro Boccia, Lorenzo Bortolan, Federico Schena, Barbara Pellegrini
PURPOSE: To evaluate the level of activation and timing of upper- and lower-body muscles during double poling at different speeds on snow. METHODS: Nineteen well-trained cross-country skiers volunteered to double pole on a flat snowy track at different speeds (15, 18, 21 km h(-1)). The target speeds could be maintained by the skiers thanks to the use of an audio-pace system in combination with cones spaced equally alongside the track. Only 11 subjects were finally included in the analysis, since their actual speeds, calculated through a photocell system, were within ±0...
November 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28810170/the-role-of-speed-and-incline-in-the-spontaneous-choice-of-technique-in-classical-roller-skiing
#13
Gertjan Ettema, Espen Kveli, Magne Øksnes, Øyvind Sandbakk
Cross-country skiers change technique depending on terrain (incline) and effort (work rate; speed at a particular incline or resistance). The literature is not unequivocal about the influence of incline or speed on the choice of technique, i.e., which of these act as a 'control parameter'. Identifying task related control parameters for spontaneous technique shifts assists elucidating which mechanisms are active for triggering technique transitions. The aim of this study was to investigate whether speed or incline acted as such control parameter for technique shifts during classic style roller skiing...
August 12, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28782598/physiological-and-performance-effects-of-nitrate-supplementation-during-roller-skiing-in-normoxia-and-normobaric-hypoxia
#14
Linn Nybäck, Caroline Glännerud, Gustav Larsson, Eddie Weitzberg, Oliver Michael Shannon, Kerry McGawley
The present study examined the effects of acute nitrate (NO3(-)) supplementation ingested in the form of concentrated beetroot juice on cross-country roller-ski performance in normoxia (N) and normobaric hypoxia (H). Eight competitive cross-country skiers (five males: age 22 ± 3 years, V·O2max 71.5 ± 4.7 mL kg(-1)·min(-1); three females: age 21 ± 1 years, V·O2max 58.4 ± 2.5 mL kg(-1)·min(-1)) were supplemented with a single dose of NO3(-)-rich beetroot juice (BRJ, ∼13 mmol NO3(-)) or a NO3(-)-depleted placebo (PL, ∼0 mmol NO3(-)) and performed 2 x 6-min submaximal exercise bouts and a 1000-m time-trial (TT) on a treadmill in N (20...
August 4, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28769849/an-inverse-relative-age-effect-in-male-alpine-skiers-at-the-absolute-top-level
#15
Øyvind Bjerke, Arve Vorland Pedersen, Tore K Aune, Håvard Lorås
The Relative Age Effect (RAE) can be described as the advantage of being born early after a certain cut-off date within a group of selection. The effect has been found across a wide range of sports and is particularly evident in pre-elite sports and team sports with a high selection pressure. At the absolute top level in team elite sports, the advantage of being relatively older has been reported to disappear, and even reverse, so that the relatively younger athletes are advantaged. In order to further examine such a reversal of the RAE, we investigated the performance of the overall top 50 skiers each year in the alpine World Cup, over a period of 20 years, among men (N = 234) and women (N = 235)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28763504/full-course-macro-kinematic-analysis-of-a-10-km-classical-cross-country-skiing-competition
#16
Finn Marsland, Colin Mackintosh, Hans-Christer Holmberg, Judith Anson, Gordon Waddington, Keith Lyons, Dale Chapman
In this study micro-sensors were employed to analyse macro-kinematic parameters during a classical cross-country skiing competition (10 km, 2-lap). Data were collected from eight male participants during the Australian championship competition wearing a single micro-sensor unit (MinimaxX™, S4) positioned on their upper back. Algorithms and visual classification were used to identify skiing sub-techniques and calculate velocities, cycle lengths (CL) and cycle rates (CR) over the entire course. Double poling (DP) was the predominant cyclical sub-technique utilised (43 ± 5% of total distance), followed by diagonal stride (DS, 16 ± 4%) and kick double poling (KDP, 5 ± 4%), with the non-propulsive Tuck technique accounting for 24 ± 4% of the course...
2017: PloS One
https://www.readbyqxmd.com/read/28746948/-factors-associated-with-safety-knowledge-on-alpine-ski%C3%A2-slopes
#17
Gerhard Ruedl, Elena Pocecco, Friedrich Brunner, Klaus Greier, Carolin Hildebrandt, Christian Raschner
Background The jurisdiction after a winter sport accident including a third party fault considers the 10 rules for safe skiing/snowboarding introduced by the International Ski Federation (FIS) to clarify the question of liability. A previous study revealed that beginners, young skiers and those who were not local residents displayed insufficient safety knowledge in given situations. The aim of this study was to evaluate additional factors associated with safety knowledge on ski slopes, e. g. type of winter sport, helmet use, risk taking behavior, and a previous injury occurred on a ski slope...
July 26, 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28744166/intramyocellular-lipids-of-muscle-type-in-athletes-of-different-sport-disciplines
#18
Yoshinao Nakagawa, Masaaki Hattori
The present study used magnetic resonance spectroscopy ((1)H-MRS) to examine quantitative differences in intramyocellular lipid (IMCL) contents in various muscle types at rest for individual athletes from different sport disciplines. Five groups consisting of sprinters, alpine skiers, cross-country skiers, endurance runners and untrained healthy male subjects volunteered for this study. Data were acquired using (1)H-MRS from the tibialis anterior (TA), medial gastrocnemius (MG) and soleus (SOL) muscles. No significant difference was found in the cross-sectional area (CSA) of the TA, MG and SOL muscles, whereas the CSA of subcutaneous fat was significantly lower (p<0...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/28738884/health-status-and-health-behaviors-among-citizen-endurance-nordic-skiers-in-the-united-states
#19
Paul J Anderson, Ralph S Bovard, Mohammad Hassan Murad, Timothy J Beebe, Zhen Wang
BACKGROUND: More than two-thirds of Americans are overweight or obese (69%) placing them at high risk for a wide array of chronic diseases. Physical activity anchors most approaches to obesity prevention and weight management, but physical activity levels remain low in the general US population. As a group, citizen athletes who compete in Nordic skiing events such as the American Birkebeiner participate in fitness cultures that promote physical activity. METHODS: During October-November 2014, we emailed a 48 question online survey to 23,611 individuals who had participated in the American Birkebeiner ski event, the largest citizen ski race in North America...
July 24, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28713458/trunk-strength-characteristics-of-elite-alpine-skiers-a-comparison-with-physically-active-controls
#20
Carolin Hildebrandt, Lisa Müller, Christian Heisse, Christian Raschner
Core muscle imbalances and weak trunk strength are relevant for injury prevention and performance. Information regarding core strength requirements and ideal flexion/extension ratios in alpine skiing is limited. We aimed to compare trunk strength capacities in elite alpine skiers with those of a matched control group. The concentric maximal trunk flexion and extension of 109 elite skiers and 47 active controls were measured at 150°/s in a ballistic mode using the CON-TREX® TP 1000 test system. The relative flexion peak torque was higher in male ski racers (p = 0...
June 2017: Journal of Human Kinetics
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