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https://www.readbyqxmd.com/read/29593563/whole-body-vibrations-associated-with-alpine-skiing-a-risk-factor-for-low-back-pain
#1
Matej Supej, Jan Ogrin, Hans-Christer Holmberg
Alpine skiing, both recreational and competitive, is associated with high rates of injury. Numerous studies have shown that occupational exposure to whole-body vibrations is strongly related to lower back pain and some suggest that, in particular, vibrations of lower frequencies could lead to overuse injuries of the back in connection with alpine ski racing. However, it is not yet known which forms of skiing involve stronger vibrations and whether these exceed safety thresholds set by existing standards and directives...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29593541/a-preliminary-investigation-on-smokeless-tobacco-use-and-its-cognitive-effects-among-athletes
#2
Thomas Zandonai, Cristiano Chiamulera, Alberto Mancabelli, Danilo Falconieri, Marco Diana
Introduction: Among athletes, an increasing use of nicotine via smokeless tobacco has been reported. However, there are currently unanswered questions about whether the use by athletes is due to nicotine's addictive properties and/or to benefits in physical and cognitive performance (e.g., decision-making). In this original article we reported about, (i) snus-induced reinforcing effects among snus-user athletes (Survey) and (ii) the effects of snus on the Iowa Gambling Task (IGT) in snus-user skiers (Experimental study)...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29582711/the-role-of-path-length-and-speed-related-factors-for-the-enhancement-of-section-performance-in-alpine-giant-slalom
#3
Jörg Spörri, Josef Kröll, Hermann Schwameder, Erich Müller
Knowing how to enhance alpine skiing performance is essential for effective coaching. The purpose of this study was to explore the role of path length- and speed-related factors for performance enhancement, while skiing on a homogeneously set/constantly inclined giant slalom course section (average gate distance: 27 m; offset: 8 m; slope inclination: 26°). During a video-based three-dimensional kinematic field-experiment, the data of six athletes who skied a two-gate section on four different types of skis were collected...
March 27, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29570600/the-age-of-peak-marathon-performance-in-cross-country-skiing-the-engadin-ski-marathon
#4
Beat Knechtle, Pantelis T Nikolaidis
Knechtle, B and Nikolaidis, PT. The age of peak marathon performance in cross-country skiing-the "Engadin Ski Marathon." J Strength Cond Res 32(4): 1131-1136, 2018-The age of the best endurance performance has been well investigated in flat city running marathons. However, we have no knowledge about the age of peak marathon performance in cross-country skiing, which would be of great practical value for athletes and coaches. Therefore, the aim of the present study was to examine the age of peak marathon performance in cross-country skiing...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29559918/application-of-dgnss-in-alpine-ski-racing-basis-for-evaluating-physical-demands-and-safety
#5
Matthias Gilgien, Josef Kröll, Jörg Spörri, Philip Crivelli, Erich Müller
External forces, such as ground reaction force or air drag acting on athletes' bodies in sports, determine the sport-specific demands on athletes' physical fitness. In order to establish appropriate physical conditioning regimes, which adequately prepare athletes for the loads and physical demands occurring in their sports and help reduce the risk of injury, sport-and/or discipline-specific knowledge of the external forces is needed. However, due to methodological shortcomings in biomechanical research, data comprehensively describing the external forces that occur in alpine super-G (SG) and downhill (DH) are so far lacking...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29547554/in-field-validation-of-an-inertial-sensor-based-system-for-movement-analysis-and-classification-in-ski-mountaineering
#6
Jules Gellaerts, Evgeny Bogdanov, Farzin Dadashi, Benoit Mariani
Ski Mountaineering (SkiMo) is a fast growing sport requiring both endurance and technical skills. It involves different types of locomotion with and without the skis. The aim of this study is to develop and validate in the snowfield a novel inertial-based system for analysing cycle parameters and classifying movement in SkiMo in real-time. The study was divided into two parts, one focused on real-time parameters estimation (cadence, distance from strides, stride duration, stride length, number of strides, slope gradient, and power) and, second, on transition detection (kickturns, skin on, skin off, ski on and off backpack) in order to classify between the different types of locomotion...
March 16, 2018: Sensors
https://www.readbyqxmd.com/read/29535586/impact-of-incline-sex-and-level-of-performance-on-kinematics-during-a-distance-race-in-classical-cross-country-skiing
#7
Thomas Stöggl, Boye Welde, Matej Supej, Chiara Zoppirolli, Carsten G Rolland, Hans-Christer Holmberg, Barbara Pellegrini
Here, female and male elite cross-country (XC) skiers were compared on varying terrain during an official 10-km (women) and 15-km (men) Norwegian championship race. On the basis of race performance, 82 skiers were classified as fast (FS) (20 women, 20 men) or slower (SS) (21, 21) skiers. All were video recorded on flat (0°), intermediate (3.5°), uphill (7.1°) and steep uphill (11°) terrain during the race at a distance of 0.8, 1.2, 2.1 and 7.1 km from the start, respectively. All skiers employed exclusively double-poling (DP) on the flat section and, except for the male winner, exclusively diagonal stride (DIA) on the uphill sections...
March 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29484250/patellofemoral-chondral-defect-in-a-preadolescent-skier-a-case-report-in-early-sport-specialization
#8
Nicholas N DePhillipo, Mark E Cinque, Nicholas I Kennedy, Jorge Chahla, Gilbert Moatshe, Robert F LaPrade
Background and Purpose: Early sport specialization (ESS) refers to intense training year round in a specific sport starting at a young age with no or limited participation in other sports. This approach to training is highly controversial; recent literature suggests that this type of specialized training could be a contributing source to overuse injuries in youth athletes. The purpose of this case report was to describe a patellofemoral articular cartilage defect of the knee in a preadolescent skier due to overuse and repetitive microtrauma as a result of ESS...
February 2018: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29480577/injuries-to-the-collateral-ligaments-of-the-metacarpophalangeal-and-interphalangeal-joints-sonographic-appearance
#9
REVIEW
Ferdinando Draghi, Salvatore Gitto, Stefano Bianchi
Injuries to the collateral ligaments of the metacarpophalangeal (MCP) and interphalangeal (IP) joints are commonly encountered in both athletes and nonathletes. They require prompt evaluation to ensure proper management and prevent loss of joint motion and permanent disability. Imaging is often required to confirm the diagnosis and assess injury severity. This review article aims to provide physicians with guidelines for sonographic assessment of the collateral ligaments of the MCP and IP and related injuries...
February 26, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29472871/a-comparison-between-different-methods-of-estimating-anaerobic-energy-production
#10
Erik P Andersson, Kerry McGawley
Purpose: The present study aimed to compare four methods of estimating anaerobic energy production during supramaximal exercise. Methods: Twenty-one junior cross-country skiers competing at a national and/or international level were tested on a treadmill during uphill (7°) diagonal-stride (DS) roller-skiing. After a 4-minute warm-up, a 4 × 4-min continuous submaximal protocol was performed followed by a 600-m time trial (TT). For the maximal accumulated O2 deficit (MAOD) method the [Formula: see text]O2 -speed regression relationship was used to estimate the [Formula: see text]O2 demand during the TT, either including (4+Y, method 1) or excluding (4-Y, method 2) a fixed Y-intercept for baseline [Formula: see text]O2 ...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29469995/hypobaric-live-high-train-low-does-not-improve-aerobic-performance-more-than-live-low-train-low-in-cross-country-skiers
#11
P Robach, J Hansen, A Pichon, A-K Meinild Lundby, S Dandanell, G Slettaløkken Falch, D Hammarström, D H Pesta, C Siebenmann, S Keiser, P Kérivel, J E Whist, B R Rønnestad, C Lundby
Live high-train low (LHTL) using hypobaric hypoxia was previously found to improve sea-level endurance performance in well-trained individuals; however, confirmatory controlled data in athletes are lacking. Here, we test the hypothesis that natural-altitude LHTL improves aerobic performance in cross-country skiers, in conjunction with expansion of total hemoglobin mass (Hbmass , carbon monoxide rebreathing technique) promoted by accelerated erythropoiesis. Following duplicate baseline measurements at sea level over the course of 2 weeks, nineteen Norwegian cross-country skiers (three women, sixteen men, age 20 ± 2 year, maximal oxygen uptake (VO2 max) 69 ± 5 mL/min/kg) were assigned to 26 consecutive nights spent at either low (1035 m, control, n = 8) or moderate altitude (2207 m, daily exposure 16...
February 22, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29445518/why-do-endocrine-profiles-in-elite-athletes-differ-between-sports
#12
Peter H Sönksen, Richard I G Holt, Walailuck Böhning, Nishan Guha, David A Cowan, Christiaan Bartlett, Dankmar Böhning
Background: Endocrine profiles have been measured on blood samples obtained immediately post-competition from 693 elite athletes from 15 Olympic Sports competing at National or International level; four were subsequently excluded leaving 689 for the current analysis. Methods: Body composition was measured by bioimpedance in a sub-set of 234 (146 men and 88 women) and from these data a regression model was constructed that enabled 'estimated' lean body mass and fat mass to be calculated on all athletes...
2018: Clinical Diabetes and Endocrinology
https://www.readbyqxmd.com/read/29401197/effects-of-an-8-week-body-weight-neuromuscular-training-on-dynamic-balance-and-vertical-jump-performances-in-elite-junior-skiing-athletes-a-randomized-controlled-trial
#13
Jacopo A Vitale, Antonio La Torre, Giuseppe Banfi, Matteo Bonato
Vitale, JA, La Torre, A, Banfi, G, and Bonato, M. Effects of an 8-week body-weight neuromuscular training on dynamic balance and vertical jump performances in elite junior skiing athletes: a randomized controlled trial. J Strength Cond Res 32(4): 911-920, 2018-The aim of the present randomized controlled trial was to evaluate the effects of an 8-week neuromuscular training program focused on core stability, plyometric, and body-weight strengthening exercises on dynamic postural control and vertical jump performance in elite junior skiers...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29345960/pacing-strategies-by-age-in-marathon-cross-country-skiing
#14
Pantelis Theodoros Nikolaidis, Beat Knechtle
OBJECTIVES: Pacing strategies have mainly been investigated for runners, but little is known for cross-country skiers. The aim of the present study was to investigate whether differences in pacing strategies do exist between younger and older cross-country skiers competing in the 42 km 'Engadin Ski Marathon'. METHODS: Pacing was studied in 105,565 cross-country skiers (classified in 5-year age groups) competing between 1998 and 2016 in this race by examining changes of mean section velocity in 10 km (Change A, i...
January 24, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29344540/standing-height-as-a-prevention-measure-for-overuse-injuries-of-the-back-in-alpine-ski-racing-a-kinematic-and-kinetic-study-of-giant-slalom
#15
Jörg Spörri, Josef Kröll, Benedikt Fasel, Kamiar Aminian, Erich Müller
Background: In alpine ski racing, typical loading patterns of the back include a combined occurrence of spinal bending, torsion, and high peak loads. These factors are known to be associated with high spinal disc loading and have been suggested to be attributable to different types of spine deterioration. However, little is known about the effect of standing height (ie, the distance between the bottom of the running surface of the ski and the ski boot sole) on the aforementioned back loading patterns...
January 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29343462/a-tailored-web-based-advice-tool-for-skiers-and-snowboarders-protocol-for-a-randomized-controlled-trial
#16
Ellen Kemler, Vincent Gouttebarge
BACKGROUND: Being active in sports has many positive health effects. The direct effects of engaging in regular physical activity are particularly apparent in the prevention of several chronic diseases, including cardiovascular disease, diabetes, cancer, hypertension, obesity, depression, and osteoporosis. Besides the beneficial health effects of being active, sports participation is unfortunately also associated with a risk of injuries. In the case of many sports injuries (eg, winter sports) preventive measures are not compulsory, which means that a behavioral change in sports participants is necessary to increase the use of effective measures, and subsequently prevent or reduce injuries in sports...
January 17, 2018: JMIR Research Protocols
https://www.readbyqxmd.com/read/29339981/using-bilateral-functional-and-anthropometric-tests-to-define-symmetry-in-cross-country-skiers
#17
Glenn Björklund, Marie Alricsson, Ulla Svantesson
The aim of this study was to evaluate the symmetry of anthropometry and muscle function in cross-country skiers and their association to vertical jumping power. Twenty cross-country skiers were recruited (21.7 ± 3.8 yrs, 180.6 ± 7.6 cm, 73.2 ± 7.6 kg). Anthropometric data was obtained using an iDXA scan. VO2max was determined using the diagonal stride technique on a ski treadmill. Bilateral functional tests for the upper and lower body were the handgrip and standing heel-rise tests. Vertical jump height and power were assessed with a counter movement jump...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29308847/comprehensive-overview-of-haemoglobin-mass-and-blood-volume-in-elite-athletes-across-a-wide-range-of-different-sporting-disciplines
#18
Irina Zelenkova, Sergey Zotkin, Pavel Korneev, Sergey Koprov, Alexandr Grushin
BACKGROUND: Comparison of total haemoglobin mass (tHb-mass) and blood volume (BV) across elite athletes different sporting specialisations. METHODS: 222 members of Russian national teams from 12 different disciplines and non Olympic competitive season for tHb-mass, BV, plasma volume (PV), haemoglobin concentration (Hb), and hematocrit level (Hct) determination. tHb-mass measurements were performed using CO-rebreathing technique, alongside Hb and Hct (capillary blood)...
January 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29283421/automatic-classification-of-sub-techniques-in-classical-cross-country-skiing-using-a-machine-learning-algorithm-on-micro-sensor-data
#19
Ole Marius Hoel Rindal, Trine M Seeberg, Johannes Tjønnås, Pål Haugnes, Øyvind Sandbakk
The automatic classification of sub-techniques in classical cross-country skiing provides unique possibilities for analyzing the biomechanical aspects of outdoor skiing. This is currently possible due to the miniaturization and flexibility of wearable inertial measurement units (IMUs) that allow researchers to bring the laboratory to the field. In this study, we aimed to optimize the accuracy of the automatic classification of classical cross-country skiing sub-techniques by using two IMUs attached to the skier's arm and chest together with a machine learning algorithm...
December 28, 2017: Sensors
https://www.readbyqxmd.com/read/29276416/impact-of-lowering-ski-binding-settings-on-the-outcome-of-the-self-release-test-of-ski-bindings-among-female-recreational-skiers
#20
Markus Posch, Martin Burtscher, Alois Schranz, Katja Tecklenburg, Kenneth Helle, Gerhard Ruedl
Background and purpose: The ability to successfully self-release the ski binding can prevent skiing-related injuries of the lower extremities. Failure of binding release associated with a knee injury is significantly higher among females compared to males. The International Standards Organization ISO 11088 standard for binding setting values allows a lowering by 15% upon request of the skier. Thus, the aim of this study was to evaluate the impact of lowered ski binding settings by 15% on the outcome of the self-release test among female recreational skiers...
2017: Open Access Journal of Sports Medicine
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