Validity and reliability of the Newtest Powertimer 300-series testing system.

abstract：:The behavioural modifications that accompany Ramadan intermittent fasting (RIF) are usually associated with some alterations in the metabolic, physiological, and psychological responses of athletes that may affect sport performance. Muslim athletes who are required to train and/or compete during the month-long, diurna...

journal_title：Journal of sports sciences

authors： Chaouachi A,Leiper JB,Chtourou H,Aziz AR,Chamari K

更新日期：2012-01-01 00:00:00

abstract：:Exercise and treating hyperlipidaemia with statins are two integral components of the American Heart Association guidelines to reduce cardiovascular risk in adults. Since statins can cause myalgias and myopathies, they could affect the duration or intensity of an exercise regimen. To determine the impact of statin use...

journal_title：Journal of sports sciences

authors： Terpak K,Guthrie S,Erickson S

更新日期：2015-01-01 00:00:00

abstract：:We explore how expertise is obtained in the domain of rugby refereeing. The research data are qualitative and are drawn from an 18 month period working in collaboration with the Rugby Football Union Elite Referee Unit. Adopting an ethnographic mode of enquiry, the study combined long-term participant observation with ...

journal_title：Journal of sports sciences

authors： Ollis S,Macpherson A,Collins D

更新日期：2006-03-01 00:00:00

abstract：:This study investigates the effect of running shoes' aging on mechanical and biomechanical parameters as a function of midsole materials (viscous, intermediate, elastic) and ground inclination. To this aim, heel area of the shoe (under calcaneal tuberosity) was first mechanically aged at realistic frequency and impact...

journal_title：Journal of sports sciences

authors： Chambon N,Sevrez V,Ly QH,Guéguen N,Berton E,Rao G

更新日期：2014-01-01 00:00:00

abstract：:Artificial turf is being used more and more often. It is more available than natural turf for use, requires much less maintenance and new products are able to comply with sport performance and athletes' safety. The purpose of this paper is to compare the mechanical and biomechanical responses of two different artifici...

journal_title：Journal of sports sciences

authors： Zanetti EM,Bignardi C,Franceschini G,Audenino AL

更新日期：2013-01-01 00:00:00

abstract：:Although elite athletes have been reported to be high academic achievers, many elite soccer players struggle with a stereotype of being low academic achievers. The purpose of this study was to compare the academic level (pre-university or pre-vocational) and self-regulatory skills (planning, self-monitoring, evaluatio...

journal_title：Journal of sports sciences

authors： Jonker L,Elferink-Gemser MT,Toering TT,Lyons J,Visscher C

更新日期：2010-12-01 00:00:00

abstract：:In this study, we examined the influence of internal and external attention instructions on the performance of a pitch shot by golfers who were either highly skilled (mean handicap = 4) or low skilled (mean handicap = 26). Ten golfers in each skill group used a 9-iron to pitch a ball as close as possible to an orange ...

journal_title：Journal of sports sciences

authors： Perkins-Ceccato N,Passmore SR,Lee TD

更新日期：2003-08-01 00:00:00

abstract：:The purpose of the study was to investigate the sensitivity of an alternative maximal accumulated oxygen deficit (MAODALT) method to discriminate the "anaerobic" capacity while comparing: least trained (LT) participants (n = 12), moderately trained (MT) participants (n = 12), endurance trained (ET) participants (n = 1...

journal_title：Journal of sports sciences

authors： Zagatto AM,Nakamura FY,Milioni F,Miyagi WE,de Poli RAB,Padulo J,Bragazzi NL,Papoti M

更新日期：2017-12-01 00:00:00

abstract：:In this study, we evaluated the extent to which 2000-m rowing ergometer performance times predicted final rankings at the World Rowing Championships in a sample of 638 rowers of both sexes and body-mass classifications (i.e., open-category and lightweight rowers). Rowing ergometer performance times were examined using...

journal_title：Journal of sports sciences

authors： Mikulić P,Smoljanović T,Bojanić I,Hannafin JA,Matković BR

更新日期：2009-07-01 00:00:00

abstract：:The aims of this study were to examine the test-retest reliability and construct validity of the flywheel (FW)-squat test. Twenty male amateur team sports athletes (mean±SD: age 23±3 years) completed one familiarization session and two testing sessions including: FW-squat test with an inertial load of 0.061 kg.m2, sta...

journal_title：Journal of sports sciences

authors： Beato M,Fleming A,Coates A,Dello Iacono A

更新日期：2020-10-06 00:00:00

abstract：:The aim of the present study was to investigate the influence of different types of tasks performed with or without an electronic device (tablet) on pre-sleep alertness, subsequent sleep quality and next-day athletic performance. Eight highly trained netball players attended a sleep laboratory for pre-sleep testing, p...

journal_title：Journal of sports sciences

authors： Jones MJ,Peeling P,Dawson B,Halson S,Miller J,Dunican I,Clarke M,Goodman C,Eastwood P

更新日期：2018-01-01 00:00:00

abstract：:The feasibility requirements of administering field-based cognitive assessments are rarely reported. We examined the feasibility of administering a group-based cognitive test battery in a school setting with older adolescents. Several types of reliability were also assessed in the control group. Preliminary efficacy a...

journal_title：Journal of sports sciences

authors： Leahy AA,Michels MFI,Eather N,Hillman CH,Shigeta TT,Lubans DR,Smith JJ

更新日期：2020-08-01 00:00:00

abstract：:There is a positive association between motor competence and physical activity in child populations. Little is known about the relative variance explained in physical activity when process- versus product-oriented approaches are used for evaluating motor competence. This study aimed to examine associations between pro...

journal_title：Journal of sports sciences

authors： Hulteen RM,True L,Pfeiffer KA

更新日期：2020-02-01 00:00:00

abstract：:In this study, we measured the vertical and horizontal take-off forces, plantar pressures and activation patterns of four muscles (vastus lateralis, gluteus maximus, tibialis anterior, gastrocnemius) in 10 ski jumpers in simulated laboratory conditions when wearing either training shoes or ski jumping boots. We found ...

journal_title：Journal of sports sciences

authors： Virmavirta M,Komi PV

更新日期：2001-12-01 00:00:00

abstract：:Body image is an important concept when assessing mental health and, thus, a target for intervention work. The common approach to assess body image is via self-report and, consequently, it is important to assess stability and susceptibility of items to random change. Participants (N = 99, aged: 18-30 years) completed ...

journal_title：Journal of sports sciences

authors： Nevill AM,Lane AM,Duncan MJ

更新日期：2015-01-01 00:00:00

abstract：:The GT3X+ worn at the wrist promotes greater compliance than at the hip. Minutes in SB and PA calculated from raw accelerations at the hip and wrist provide contrasting estimates and cannot be directly compared. Wear-time for the wrist (15.6 to 17.4 h.d-1) was greater than the hip (15.2 to 16.8 h.d-1) across several w...

journal_title：Journal of sports sciences

authors： McLellan G,Arthur R,Buchan DS

更新日期：2018-11-01 00:00:00

abstract：:We examined a theoretical model of global self-esteem that incorporated constructs from achievement goal and self-determination theories. The model hypothesized that self-determined or autonomous motives would mediate the influence of achievement goal orientation on global self-esteem. The adapted version of the Behav...

journal_title：Journal of sports sciences

authors： Hein V,Hagger MS

更新日期：2007-01-15 00:00:00

abstract：:Few studies have focused on the effect of posture during sprint start. The aim of this study was to measure the effect of the modification of horizontal distance between the blocks during sprint start on three dimensional (3D) joint angular velocity. Nine trained sprinters started using three different starting positi...

journal_title：Journal of sports sciences

authors： Slawinski J,Dumas R,Cheze L,Ontanon G,Miller C,Mazure-Bonnefoy A

更新日期：2013-01-01 00:00:00

abstract：:Functional hypothalamic amenorrhoea (FHA) can occur due to the independent or combined effects of psychogenic and energetic stressors. In exercising women, research has primarily focused on energy deficiency as the cause of FHA while psychological stressors have been ignored. To assess both psychological and metabolic...

journal_title：Journal of sports sciences

authors： Strock NCA,De Souza MJ,Williams NI

更新日期：2020-11-01 00:00:00

abstract：:Bioelectrical impedance spectroscopy (BIS) provides an affordable and practical assessment of fat-free mass (FFM). However, little information is available on the assessment of changes in fat-free mass in top-level athletes using BIS. The aim of this study was to examine the accuracy of BIS in tracking changes in fat-...

journal_title：Journal of sports sciences

authors： Matias CN,Santos DA,Fields DA,Sardinha LB,Silva AM

更新日期：2012-01-01 00:00:00

abstract：:To characterize rugby union lineout throwing technique, three experienced male rugby players performed throwing trials under varying conditions of distance and trajectory. Motion analysis permitted the recovery of joint centre coordinates at 120 Hz and the construction of a three-dimensional linked segment model for c...

journal_title：Journal of sports sciences

authors： Trewartha G,Casanova R,Wilson C

更新日期：2008-06-01 00:00:00

abstract：:The purpose of this paper was to systematically review the literature and examine the research methodological quality, measurement properties and feasibility of the Loughborough Soccer Passing Test (LSPT). Databases were searched up to June 2017. Twenty five studies fulfilled the eligibility criteria. The main methodo...

journal_title：Journal of sports sciences

authors： Wen D,Robertson S,Hu G,Song B,Chen H

更新日期：2018-08-01 00:00:00

abstract：:The purpose was to assess the mechanical work and physiological responses to cross country mountain bike racing. Participants (n = 7) cycled on a cross country track at race speed whilst VO2, power, cadence, speed, and geographical position were recorded. Mean power during the designated start section (68.5 ± 5.5 s) w...

journal_title：Journal of sports sciences

authors： Macdermid PW,Stannard S

更新日期：2012-01-01 00:00:00

abstract：:The use of dieting, rapid weight loss, and frequent weight fluctuation among athletes competing in weight-class and leanness sports have been considered a problem for years, but the extent of the problem and the health and performance consequences have yet to be fully examined. Most studies examining these issues have...

journal_title：Journal of sports sciences

authors： Sundgot-Borgen J,Garthe I

更新日期：2011-01-01 00:00:00

abstract：:This study developed a method to determine whether the distribution of individual player performances can be modelled to explain match outcome in team sports, using Australian Rules football as an example. Player-recorded values (converted to a percentage of team total) in 11 commonly reported performance indicators w...

journal_title：Journal of sports sciences

authors： Robertson S,Gupta R,McIntosh S

更新日期：2016-10-01 00:00:00

abstract：:Physical inactivity is proven to be a risk factor for non-communicable diseases and all-cost mortality. Public health policy recommends community settings worldwide such as the workplace to promote physical activity. Despite the growing prevalence of workplace team sports, studies have not synthesised their benefits w...

journal_title：Journal of sports sciences

authors： Brinkley A,McDermott H,Munir F

更新日期：2017-01-01 00:00:00

abstract：:The purpose of this study was to gather information from scientific literature related to all steps of Van Mechelen's "sequence of prevention" for injuries applied to youth and adult recreational field hockey players. A systematic review was conducted in Medline via Pubmed and in SPORTDiscus via EBSCOhost. Twenty-six ...

journal_title：Journal of sports sciences

authors： Cornelissen M,Kemler E,Verhagen E,Gouttebarge V

更新日期：2020-09-01 00:00:00

abstract：:While empirical evidence suggests that elite athletes have superior lifespan outcomes relative to the general population, less is known regarding their causes of death. The purpose of this study was to critically examine the mortality outcomes of deceased National Basketball Association and American Basketball Associa...

journal_title：Journal of sports sciences

authors： Lemez S,Wattie N,Lawler T,Baker J

更新日期：2018-07-01 00:00:00

abstract：:The aim of this study was to identify the effects of adding spatial references during football small-sided games in youth players' tactical and physical performance. Twelve under-15 players performed a Gk+ 6v6+ Gk game under two playing conditions: (i) without spatial references (CONTROL condition); (ii) with spatial ...

journal_title：Journal of sports sciences

authors： Coutinho D,Gonçalves B,Travassos B,Abade E,Wong DP,Sampaio J

更新日期：2019-04-01 00:00:00

abstract：:This study investigated whether repeated, very short duration sprints influenced endothelial function (indicated by flow-mediated dilation) and triacylglycerol concentrations following the ingestion of high-fat meals in adolescent boys. Nine adolescent boys completed two, 2-day main trials (control and exercise), in a...

journal_title：Journal of sports sciences

authors： Sedgwick MJ,Morris JG,Nevill ME,Barrett LA

更新日期：2015-01-01 00:00:00