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Sport speed

Hardaway Chun-Kwan Chan, Weeraya Ka-Yan Ho, Patrick Shu-Hang Yung
Background/Objective: The aim of this study was to examine the effect of sprint cycling training on the intermittent run performance, sprinting speed, and change of direction (COD) ability of recreational intermittent sports athletes. Methods: Sixteen participants participated in the study. The experimental group (EG, n = 8) received a total of 12 sessions of sprint cycling training in a 4-week period and the control group (CG, n = 8) received no training. Both EG and CG were instructed to maintain their daily activity during the 4-week period...
January 2018: Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology
Krzysztof Karpowicz, Katarzyna Krych, Małgorzata Karpowicz, Witold Nowak, Piotr Gronek
The map of candidate genes that can potentially affect physical fitness becomes larger every year, and they are associated with such aspects as respiratory and cardiovascular stability; body build and composition - especially muscle mass and strength; carbohydrate and lipid metabolism; response to training; and exercise intolerance.The aim of this study was to analyze the relationship between the CA repeat polymorphism of the P1 promoter of the IGF1 gene and the structure of motor skills in the two groups of Polish young athletes in 2011-2013...
March 15, 2018: Acta Biochimica Polonica
Jason McGahan, Con Burns, Seán Lacey, Tim Gabbett, Cian O' Neill
PURPOSE: This study investigated the positional running demands of elite Gaelic football players during match-play and compared these demands with typical training activities used to prepare players for competition. METHODS: Global positioning system (GPS) data was obtained from thirty elite Gaelic football players (26.9 ± 3.5 years, 182.8 ± 6.1 cm, 84.6 ± 8.1 kg) across a full season (13 competitive games and 78 training sessions). Only players who completed the full match and respective training sessions were included (n = 107 match files and n = 1,603 training files)...
March 12, 2018: Journal of Strength and Conditioning Research
Curtis L Tomasevicz, Jack W Ransone, Christopher W Bach
The requisite combination of speed, power, and strength necessary for a bobsled push athlete coupled with the difficulty in directly measuring pushing ability makes selecting effective push crews challenging. Current practices by USA Bobsled and Skeleton (USABS) utilize field combine testing to assess and identify specifically selected performance variables in an attempt to best predict push performance abilities. Combine data consisting of 11 physical performance variables were collected from 75 subjects across two winter Olympic qualification years (2009 and 2013)...
March 12, 2018: Journal of Strength and Conditioning Research
Athol Thomson, Einar Einarsson, Clint Hansen, Chris Bleakley, Rod Whiteley
OBJECTIVES: Compare maximum plantar force (Fmax) during running in soccer players following anterior cruciate ligament reconstruction (ACLR) as they pass return to sport (RTS) criteria. DESIGN: Case control study. METHODS: Soccer players after ACLR (n=16) and matched healthy controls (n=16) ran on a treadmill at 12, 14 and 16km/h while plantar loading data was measured using an in-shoe pressure system (Pedar-X, Novel). Fmax and contact time of the injured and uninjured limbs in athletes <9months post-ACLR and those ≥9months ACLR were compared to healthy players (no ACLR)...
March 1, 2018: Journal of Science and Medicine in Sport
M Bohnsack
OBJECTIVE: Complete arthroscopic decompression of the impinging subspinal soft tissues and resection of the hypertrophic bone formation between the anterior hip capsule and the anterior inferior iliac spine (AIIS) or decompression of a hypertrophic AIIS. INDICATIONS: Painful anterior hip impingement and decreased hip flexion following a hypertrophic osseous subspinal deformation. CONTRAINDICATIONS: No clinical symptoms or decreased anterior hip function despite radiological osseous subspinal hip impingement...
March 2, 2018: Operative Orthopädie und Traumatologie
Anne J Carter, Emily J Hall
Increasing numbers of people are running with their dogs, particularly in harness through the sport canicross. Whilst canicross races are typically held in the winter months, some human centred events are encouraging running with dogs in summer months, potentially putting dogs at risk of heat related injuries, including heatstroke. The aim of this project was to investigate the effects of ambient conditions and running speed on post-race temperature of canicross dogs in the UK, and investigate the potential risk of heatstroke to canicross racing dogs...
February 2018: Journal of Thermal Biology
David Robert Howell, Thomas Buckley, Robert C Lynall, William Meehan
Prior studies suggest that concussion may lead to an increased risk of a subsequent time-loss sport-related injury, but the mechanisms responsible are unknown. We measured the symptom and dual-task gait outcomes for athletes initially post-concussion and after clinical recovery. Participants then self-reported any additional injuries incurred in the year after their concussion. Forty-two athletes (52% female, mean age=16.8±3.2 years) completed the study. They underwent a dual-task gait evaluation and symptom inventory within 21 days post-concussion, and again after they were deemed clinically recovered...
February 28, 2018: Journal of Neurotrauma
Renan F H Nunes, Rodolfo A Dellagrana, Fábio Y Nakamura, Cosme F Buzzachera, Flavia A M Almeida, Lucinar J F Flores, Luiz G A Guglielmo, Sérgio G da Silva
Purpose/Background: Strength asymmetries are related to knee injuries in intermittent sports players. The purpose of this study was to examine whether elite futsal players demonstrate strength asymmetries during knee isokinetic testing applying the Croisier et al.21 criteria. Methods: Forty male elite (27.9 ± 6.5 years) Brazilian futsal players participated in the study. The testing protocol required players to perform concentric contractions of both quadriceps and hamstring muscles at angular velocities of 60 °·s-1 and 240 °·s-1 and eccentric contractions of hamstring at 30 °·s-1 and 120 °·s-1 ...
February 2018: International Journal of Sports Physical Therapy
Marie Overbye
BACKGROUND: The zero-tolerance approach to doping in sport has long been criticised. Legalising 'doping' under medical supervision has been proposed as a better way of protecting both athletes' health and fair competition. This paper investigates how elite athletes might react if specific doping substances were permitted under medical supervision and explore athletes' considerations about side-effects in this situation. The results are interpreted using a framework, which views elite sport as an exceptional and risky working environment...
February 22, 2018: International Journal on Drug Policy
Amy L McIntosh, Christy M Christophersen
Motocross is a popular sport in which participants ride a two-wheeled, motorized vehicle on an uneven 2-km track with natural or human-made obstacles. Participants compete at high rates of speed, and children as young as age 4 years compete in age-appropriate groups. Motocross is recognized as a strenuous sport with a high accident rate. Most injuries are musculoskeletal in nature. The most commonly injured areas are the forearm, clavicle, femur, and tibia. Many injuries require surgical treatment. Some patients sustain head trauma with loss of consciousness...
March 1, 2018: Journal of the American Academy of Orthopaedic Surgeons
Sandro Bartolomei, Federico Nigro, Luca Gubellini, Simone Ciacci, Franco Merni, Filippo Treno, Matteo Cortesi, Gabriele Semprini
The purpose of the present study was to compare the anthropometric and performance profiles of division I (D1) and division II (D2) Italian field hockey players.Fifteen DI players and fifteen D2 players (age = 25.4 ± 5.2 y; body mass = 78.5 ± 9.0 kg; body height = 179.6 ± 7.8 cm) were assessed on one occasion for anthropometry, body composition, physiological measurements and sport-specific skills. Differences between the two groups were evaluated using a one-way analysis of variance. Pearson correlations were used to examine relationships between the different measurements...
February 20, 2018: Journal of Strength and Conditioning Research
Benjamin M Jackson, Ted Polglaze, Brian Dawson, Trish King, Peter Peeling
PURPOSE: To compare data from conventional GPS and new GNSS-enabled tracking devices, and to examine the inter-unit reliability of GNSS devices. METHODS: Inter-device differences between 10 Hz GPS and GNSS devices were examined during laps (n=40) of a simulated game circuit (SGC) and during elite hockey matches (n=21); GNSS inter-unit reliability was also examined during the SGC laps. Differences in distance values and measures in three velocity categories (low <3 m...
February 21, 2018: International Journal of Sports Physiology and Performance
Marshed Mohamed, Michael Cheffena, Arild Moldsvor
Body-to-body wireless networks (BBWNs) have great potential to find applications in team sports activities among others. However, successful design of such systems requires great understanding of the communication channel as the movement of the body components causes time-varying shadowing and fading effects. In this study, we present results of the measurement campaign of BBWN during running and cycling activities. Among others, the results indicated the presence of good and bad states with each state following a specific distribution for the considered propagation scenarios...
February 18, 2018: Sensors
Carl Alexander James, Florencio Tenllado Vallejo, Melvin Kantebeen, Saro Farra
Current on-court assessments of aerobic fitness in squash are not designed to yield a wealth of physiological data. Moreover, tests may require complex computer equipment or involve simulated racket strokes, which are difficult to standardize at high intensities. This study investigated the validity and reliability of a squash-specific fitness test which can yield both a standalone performance score, as well as pertinent physiological markers such as V[Combining Dot Above]O2max, the lactate turnpoint and oxygen cost, in a sport-specific environment...
February 14, 2018: Journal of Strength and Conditioning Research
Jonathan C Flavell, Brendan T Barrett, John G Buckley, Julie M Harris, Andrew J Scally, Nathan B Beebe, Alice G Cruickshank, Simon J Bennett
An ability to predict the time-to-contact (TTC) of moving objects that become momentarily hidden is advantageous in everyday life and could be particularly so in fast-ball sports. Prediction motion (PM) experiments have sought to test this ability using tasks where a disappearing target moves toward a stationary destination. Here, we developed two novel versions of the PM task in which the destination either moved away from (Chase) or toward (Attract) the moving target. The target and destination moved with different speeds such that collision occurred 750, 1,000 or 1,250 ms after target occlusion...
February 1, 2018: Journal of Vision
Ted Polglaze, Cruz Hogan, Brian Dawson, Alec Buttfield, Cristian Osgnach, Leanne Lester, Peter Peeling
PURPOSE: To assess the efficacy of critical metabolic power derived from variable-speed movement for classifying intensity in team sport activity. METHODS: Elite male hockey players (n = 12) completed a series of time trials (100 yd, 400 yd, 1500 yd) and a 3-min all-out test to derive both critical speed (CS) and critical power (CP). Heart rate (HR), blood lactate (BLa) and rating of perceived exertion (RPE) were measured during each protocol. Participants (n = 10) then played 2 competitive hockey matches...
February 9, 2018: Medicine and Science in Sports and Exercise
Rienk M A van der Slikke, Annemarie M H de Witte, Monique A M Berger, Daan J J Bregman, Dirk Jan H E J Veeger
PURPOSE: The purpose of this study was to provide insight in the effect of wheelchair settings on wheelchair mobility performance. METHODS: Twenty elite wheelchair basketball athletes of low (n=10) and high classification (n=10), were tested in a wheelchair basketball directed field test. Athletes performed the test in their own wheelchair, which was modified for five additional conditions regarding seat height (high - low), mass (central - distributed) and grip...
February 12, 2018: International Journal of Sports Physiology and Performance
K L Jonvik, J Nyakayiru, J W van Dijk, K Maase, S B Ballak, J M G Senden, L J C van Loon, L B Verdijk
PURPOSE: There is an ongoing debate whether highly trained athletes are less responsive to the ergogenic properties of nitrate. We assessed the effects of nitrate supplementation on plasma nitrate and nitrite concentrations and repeated-sprint performance in recreational, competitive and elite sprint athletes. METHODS: In a randomized double-blinded cross-over design, recreational cyclists (n = 20), national talent speed-skaters (n = 22) and Olympic-level track cyclists (n = 10) underwent two 6-day supplementation periods; 140 mL/d nitrate-rich (BR; ∼800 mg/d) and nitrate-depleted (PLA; ∼0...
February 7, 2018: European Journal of Sport Science
Michał Ginszt, Małgorzata Michalak-Wojnowska, Piotr Gawda, Magdalena Wojcierowska-Litwin, Iwona Korszeń-Pilecka, Małgorzata Kusztelak, Rafał Muda, Agata A Filip, Piotr Majcher
The functional RR genotype of the alpha-actinin-3 (ACTN3) gene has been reported to be associated with elite sprint/power athlete status. Although large and rapidly increasing number of studies have investigated the associations between the ACTN3 genotypes and athletic performance in various sport disciplines, there is a lack of studies on the genetic predisposition in Sport Climbing, which was selected to be part of the next Summer Olympic Games in Tokyo 2020 with three subdisciplines ('Lead Climbing', 'Speed Climbing' and 'Bouldering')...
February 1, 2018: Journal of Strength and Conditioning Research
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