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https://www.readbyqxmd.com/read/28513243/performance-of-alpine-touring-boots-when-used-in-alpine-ski-bindings
#1
Jeffrey R Campbell, Irving S Scher, David Carpenter, Bruce L Jahnke, Randal P Ching
Alpine Touring (AT) equipment is designed for ascending mountains and snow skiing down backcountry terrain. Skiers have been observed using AT boots in alpine (not made for Alpine Touring) ski bindings. We tested the effect on the retention-release characteristics of AT boots used in alpine bindings. Ten AT ski boots and five alpine ski boots were tested in eight models of alpine ski bindings using an ASTM F504-05 (2012) apparatus. 31% of the AT boots released appropriately when used in alpine ski bindings...
May 17, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28486336/seasonal-variations-of-bone-metabolism-and-bone-mineral-density-in-collegiate-alpine-skiers
#2
Teruyuki Sato, Keishoku Sakuraba, Yosuke Tsuchiya, Shinya Maruyama, Eisuke Ochi
This study investigated the seasonal variations in bone metabolism, mineral density, and physical characteristics in collegiate alpine skiers. Twelve male subjects (20.6 ± 1.5 years) were evaluated for body composition, body mineral density (BMD), serum levels of osteocalcin (OC), bone alkaline phosphatase (BAP), tartrate-resistant acid phosphatase 5b (TRACP-5b), parathormone, and 25-hydroxyvitamin D (25(OH)D). We also measured the knee extensor and flexor strength, maximal power, and vertical jump. Measurements were conducted in the pre-season period (T1), competitive period (T2), end-of-season period (T3), and resting period (T4)...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28472092/influence-of-slope-steepness-foot-position-and-turn-phase-on-plantar-pressure-distribution-during-giant-slalom-alpine-ski-racing
#3
Thomas Falda-Buscaiot, Frédérique Hintzy, Patrice Rougier, Patrick Lacouture, Nicolas Coulmy
The purpose of this study was to investigate the evolution of ground reaction force during alpine skiing turns. Specifically, this study investigated how turn phases and slope steepness affected the whole foot normal GRF pattern while performing giant slalom turns in a race-like setting. Moreover, the outside foot was divided into different plantar regions to see whether those parameters affected the plantar pressure distribution. Eleven skiers performed one giant slalom course at race intensity. Runs were recorded synchronously using a video camera in the frontal plane and pressure insoles under both feet's plantar surface...
2017: PloS One
https://www.readbyqxmd.com/read/28445904/-are-there-sex-differences-regarding-ski-length-to-height-ratio-ski-length-to-weight-ratio-sidecut-radius-and-ski-boot-sole-abrasion-among-acl-injured-male-and-female-skiers
#4
Markus Posch, Gerhard Ruedl, Katja Tecklenburg, Kenneth Helle, Alois Schranz, Martin Burtscher
Introduction Female skiers suffer from knee injuries twice as much as male skiers, and the risk of an injury to the anterior cruciate ligament (ACL) is three times greater among females compared to males. The sex-specific ACL injury risk depends on internal (e. g. age, skiing skills, fitness level) and external (e. g. slope and weather conditions, ski equipment) factors. However, it is not clear whether male and female recreational skiers with an ACL injury differ regarding the sidecut radius and ski boot sole abrasion...
April 26, 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28435336/anterior-cruciate-ligament-injury-reinjury-in-alpine-ski-racing-a-narrative-review
#5
REVIEW
Matthew J Jordan, Per Aagaard, Walter Herzog
The purpose of the present review was to: 1) provide an overview of the current understanding on the epidemiology, etiology, risk factors, and prevention methods for anterior cruciate ligament (ACL) injury in alpine ski racing; and 2) provide an overview of what is known pertaining to ACL reinjury and return to sport after ACL injury in alpine ski racing. Given that most of the scientific studies on ACL injuries in alpine ski racing have been descriptive, and that very few studies contributed higher level scientific evidence, a nonsystematic narrative review was employed...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/28415868/-epidemiological-data-of-hungarian-skiers-and-snowboarders-medical-problems
#6
Péter Felkai, Ingrid Lengyel, Miklós Szokoly, Gábor Forgó
INTRODUCTION AND AIM: There are no high mountains or any advantageous circumstances for winter sports in Hungary, yet within the 10 million population there are about half a million people (the exact number is 550,000) who tend to go for skiing or snowboarding abroad. Authors compared the injury statistical data with results described in the international literature in order to develop conclusions about the differences in the injury patterns and frequency between the Hungarian ones' and those found in countries with plenty of winter sport possibilities...
April 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/28409199/disc-degeneration-on-mri-is-more-prevalent-in-young-elite-skiers-compared-to-controls
#7
Wisam A Witwit, Peter Kovac, Anna Sward, Cecilia Agnvall, Carl Todd, Olof Thoreson, Hanna Hebelka, Adad Baranto
PURPOSE: Evidence-based facts regarding spine abnormalities and back pain are needed in order to develop rehabilitation programs and prevent spine injuries in young skiers. The aim therefore is to identify MRI changes in the thoraco-lumbar spine and the lifetime prevalence of back pain, as well as the association between them, in young skiers compared to non-athletes. METHODS: Seventy-five young elite alpine and mogul skiers, age range 16-20 years, were compared with 27 non-athletic controls...
April 13, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28382550/sitting-position-affects-performance-in-cross-country-sit-skiing
#8
M Lund Ohlsson, M S Laaksonen
PURPOSE: In cross-country sit-skiing (XCSS), athletes with reduced trunk control predominantly sit with the knees higher than the hips (KH); a position often associated with large spinal flexion. Therefore, to improve spinal curvature a new sledge with frontal trunk support, where knees are lower than hips (KL) was created. It was hypothesized that the KL position would improve respiratory function and enhance performance in seated double-poling compared to KH. METHODS: Ten female able-bodied cross-country skiers (age 25...
April 5, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28314090/prevalence-age-at-onset-and-risk-factors-of-self-reported-asthma-among-swedish-adolescent-elite-cross-country-skiers
#9
L M Eriksson, T Irewall, Anne Lindberg, Nikolai Stenfors
The objective of the study was to compare the prevalence of self-reported physician-diagnosed asthma and age at asthma onset between Swedish adolescent elite skiers and a reference group and to assess risk factors associated with asthma. Postal questionnaires were sent to 253 pupils at the Swedish National Elite Sport Schools for cross-country skiing, biathlon, and ski-orienteering ("skiers") and a random sample of 500 adolescents aged 16-20, matched for sport school municipalities ("reference"). The response rate was 96% among the skiers and 48% in the reference group...
March 17, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28291666/risk-and-protective-factors-for-sudden-cardiac-death-during-leisure-activities-in-the-mountains-an-update
#10
REVIEW
Martin Burtscher
INTRODUCTION: Annually, more than 100 million tourists with widely varying health and fitness status are attracted by the mountainous areas around the world. Whereas mountaineering activities may contribute to the well established beneficial effects of regular exercise, for certain individuals these activities are also associated with a relatively high risk of death. METHODS: This manuscript presents an updated overview of risk and protective factors for sudden cardiac death during leisure activities in the mountains...
February 28, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28287028/technique-analysis-in-elite-athletes-using-principal-component-analysis
#11
Øyvind Gløersen, Håvard Myklebust, Jostein Hallén, Peter Federolf
The aim of this study was to advance current movement analysis methodology to enable a technique analysis in sports facilitating (1) concurrent comparison of the techniques between several athletes; (2) identification of potentially beneficial technique modifications and (3) a visual representation of the findings for feedback to the athletes. Six elite cross-country skiers, three world cup winners and three national elite, roller ski skated using the V2 technique on a treadmill while their movement patterns were recorded using 41 reflective markers...
March 13, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28270769/the-role-of-power-fluctuations-in-the-preference-of-diagonal-vs-double-poling-sub-technique-at-different-incline-speed-combinations-in-elite-cross-country-skiers
#12
Christine Dahl, Øyvind Sandbakk, Jørgen Danielsen, Gertjan Ettema
In classical cross-country skiing, diagonal stride (DIA) is the major uphill sub-technique, while double poling (DP) is used on relatively flat terrain. Although, the dependence of incline and speed on the preference of either sub-technique seems clearly established, the mechanisms behind these preferences are not clear. Therefore, the purpose of this study was to compare kinetics and energy consumption in DP and DIA at the same submaximal workload in cross-country skiing under two different incline-speed combinations...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28241030/effects-of-upper-body-sprint-interval-training-on-strength-and-endurance-capacities-in-female-cross-country-skiers
#13
Kristine Vandbakk, Boye Welde, Andrea Hovstein Kruken, Julia Baumgart, Gertjan Ettema, Trine Karlsen, Øyvind Sandbakk
This study compared the effects of adding upper-body sprint-intervals or continuous double poling endurance training to the normal training on maximal upper-body strength and endurance capacity in female cross-country skiers. In total, 17 female skiers (age: 18.1±0.8yr, body mass: 60±7 kg, maximal oxygen uptake (VO2max): 3.30±0.37 L.min-1) performed an 8-week training intervention. Here, either two weekly sessions of six to eight 30-s maximal upper-body double poling sprint-intervals (SIG, n = 8) or 45-75 min of continuous low-to-moderate intensity double poling on roller skis (CG, n = 9) were added to their training...
2017: PloS One
https://www.readbyqxmd.com/read/28225237/alpine-cross-country-skier-with-energy-depletion-and-reduced-consciousness
#14
Trond Skjelstad, Marte Alsos Sørensen, Erik Waage Nielsen
No abstract text is available yet for this article.
February 2017: Tidsskrift for Den Norske Lægeforening: Tidsskrift for Praktisk Medicin, Ny Række
https://www.readbyqxmd.com/read/28219092/-analysis-of-cardiovascular-risk-factors-in-young-backcountry-skiers-in-the-gotthard-region
#15
Benedikt Andreas Gasser
Background and Objectives Although the frequency of cardiovascular events, especially the end manifestation of myocardial infarction, has decreased in recent years, cardiovascular disease continues to be one of the most frequent illnesses. Also it is known that the cardiac system sustains more stress at high altitudes than it does at intermediate altitudes. This leads to the question if young alpinists should undergo cardiac evaluation before setting out for a trip to the Himalayas or the Andes Mountains...
January 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28219091/-patrouille-des-glaciers-analysis-of-course-times
#16
Benedikt Andreas Gasser
Background Backcountry skiing has become more and more popular. The development of skis and equipment has been impressive and suggests that achieving a good performance level is much easier today than it was in the past. Taking the most popular backcountry skiing race in Switzerland, the "Patrouille des Glaciers (PDG)", we addressed the question as to whether this development has led to faster course times over the past ten years and what recommendations can be made for participants. Methods The average course times for the original course Zermatt - Arolla - Verbier were calculated over the past ten years for two cohorts (top-ten and median), separated by category...
February 20, 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28174479/effect-of-pain-free-range-exercise-on-shoulder-pain-and-range-of-motion-in-an-amateur-skier
#17
Won-Gyu Yoo
[Purpose] This study prescribed pain-free range exercises for a female amateur skier who complained of limitations in her shoulder range of motion, and pain caused by protective spasms; the tester evaluated the effects of such exercise on pain. [Subject and Methods] A 23-year-old female who complained of pain of 3 weeks in duration in the right glenohumoral and scapulothoracic joints was enrolled. [Results] After pain-free range exercises, the visual analog pain score was 2 and the shoulder flexion and abduction angles improved compared to the initial values...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28095083/physiological-capacity-and-training-routines-of-elite-cross-country-skiers-approaching-the-upper-limits-of-human-endurance
#18
Øyvind Sandbakk, Hans-Christer Holmberg
Cross-country skiing is one of the most demanding of endurance sports, involving protracted competitions on varying terrain employing a variety of skiing techniques that require upper- and/or lower-body work to different extents. Through more effective training and extensive improvements in equipment and track preparation, the speed of cross-country ski races has increased more than that of any other winter Olympic sport and, in addition, new types of racing events have been introduced. To a certain extent this has altered the optimal physiological capacity required to win and the training routines of successful skiers have evolved accordingly...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095069/the-evolution-of-champion-cross-country-skier-training-from-lumberjacks-to-professional-athletes
#19
Øyvind Sandbakk
Competitive cross-country (XC) skiing has traditions extending back to the mid-19th century and was included as a men's event in the first Winter Games in 1924. Since then, tremendous improvements in equipment, track preparation, and knowledge about training have prompted greater increases in XC-skiing speeds than in any other Olympic sport. In response, this commentary focuses on how the training of successful XC skiers has evolved, with interviews and training data from surviving Norwegian world and Olympic XC champions as primary sources...
February 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28054124/-severe-blunt-thoracic-trauma-caused-by-ski-collision
#20
S J Lochner, M Scherr, M Perl, C Grove
An approximately 25-year-old skier collided in a ski-run intersection. At high speed, he first hit another skier and then smashed into a snow cannon. He died from his injuries a short time later in hospital. A whole-body CT scan was conducted under resuscitation conditions, which was followed by an autopsy. The investigation revealed a severe blunt thoracic trauma as cause of death. The detailed analysis was the result of the combination of the two methods of investigation, CT scan and autopsy. The methods complemented each other effectively and allowed for a detailed presentation of the injury pattern...
January 4, 2017: Der Unfallchirurg
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