Evening electronic device use: The effects on alertness, sleep and next-day physical performance in athletes.

abstract：:Athletes have been shown to have greater movement imagery abilities than non-athletes. However, since these differences were observed using questionnaires where participants subjectively judged the vividness of performing imagined movements, it is possible that responses could be biased by other factors such as social...

journal_title：Journal of sports sciences

authors： Madan CR,Singhal A

更新日期：2014-01-01 00:00:00

abstract：:To develop and assess the validity of the Referee Training Activity Questionnaire (RTAQ), a systematic process was employed: 1) item generation; 2) assessments of content and face validity; and 3) assessments of criterion validity. In stage 1, items were generated following semi-structured interviews with an expert pa...

journal_title：Journal of sports sciences

authors： P McEwan G,Unnithan V,Easton C,Arthur R

更新日期：2020-12-01 00:00:00

abstract：:The aim of this study was to compare selected physiological variables and performance markers of soldiers from two "elite" units of the British Army. Ten soldiers from each of the two units were recruited for this study (n = 20). All participants completed three tests while carrying a 20 kg backpack load: (1) a maxima...

journal_title：Journal of sports sciences

authors： Simpson RJ,Gray SC,Florida-James GD

更新日期：2006-06-01 00:00:00

abstract：:Heart rate (HR), when combined with accelerometry, can dramatically improve estimates of energy expenditure and sleep. Advancements in technology, via the development and introduction of small, low-cost photoplethysmography devices embedded within wrist-worn consumer wearables, have made the collection of heart rate (...

journal_title：Journal of sports sciences

authors： Zhang Y,Weaver RG,Armstrong B,Burkart S,Zhang S,Beets MW

更新日期：2020-09-01 00:00:00

abstract：:The purpose of this study was to examine the adequacy of "multi-age" classification systems in youth sports with a specific focus on the unisex multi-age-groupings used by USA Swimming. In addition, we offer an analytical rationale for the multi-age-groupings and potential alternatives. We examined the top 100 US swim...

journal_title：Journal of sports sciences

authors： Kojima K,Jamison PL,Stager JM

更新日期：2012-01-01 00:00:00

abstract：:Although it has been generally assumed that the risk of decompression sickness is virtually zero during a single breath-hold dive in humans, repeated dives may result in a cumulative increase in the tissue and blood nitrogen tension. Many species of marine mammals perform extensive foraging bouts with deep and long di...

journal_title：Journal of sports sciences

authors： Lemaitre F,Fahlman A,Gardette B,Kohshi K

更新日期：2009-12-01 00:00:00

abstract：:The present study examined the metabolic responses to an acute bout of football and the overall and moderating role of physical fitness on these responses, in adolescents. Thirty-six adolescents (16 girls, 20 boys; 12.6±0.5 y) completed two trials (60-min football and 60-min seated rest) separated by 7-d. Capillary bl...

journal_title：Journal of sports sciences

authors： Williams RA,Cooper S,Dring KJ,Hatch L,Morris JG,Sunderland C,Nevill ME

更新日期：2021-01-11 00:00:00

abstract：:This study examines the association between prolonged sedentary time and breaks in sedentary time with cardiometabolic risk in 10-14-year-old children. This cross-sectional design study analysed accelerometry-determined sedentary behaviour and physical activity collected over 7 days from 111 (66 girls) UK schoolchildr...

journal_title：Journal of sports sciences

authors： Bailey DP,Charman SJ,Ploetz T,Savory LA,Kerr CJ

更新日期：2017-11-01 00:00:00

abstract：:Two studies investigated the structure of different athlete leadership networks and its relationship to cohesion using social network analysis. In Study 1, we examined the relationship between a general leadership quality network and task and social cohesion as measured by the Group Environment Questionnaire (GEQ). In...

journal_title：Journal of sports sciences

authors： Loughead TM,Fransen K,Van Puyenbroeck S,Hoffmann MD,De Cuyper B,Vanbeselaere N,Boen F

更新日期：2016-11-01 00:00:00

abstract：:The purpose of this study was to assess the effects of slow, fast or periodized slow and fast resistance training on voluntary, maximal and sustained force production. Altogether, 34 active females were pre-tested for maximal force production (MXF) and 20-repetition mean force production (MNF) at 1.05 and 3.14 rad s-1...

journal_title：Journal of sports sciences

authors： Doherty TJ,Campagna PD

更新日期：1993-02-01 00:00:00

abstract：:The relative length of the second and fourth digits (2D:4D) is a putative marker for prenatal testosterone. Low 2D:4D has been reported to correlate with high performance in sport in general. Here, for the first time, we examine the relationship between 2D:4D and performance in elite rugby players. The 44 players (28 ...

journal_title：Journal of sports sciences

authors： Bennett M,Manning JT,Cook CJ,Kilduff LP

更新日期：2010-11-01 00:00:00

abstract：:Research has suggested the need to use a person-centred approach to examine multidimensionality of motivation. Guided by self-determination theory (Deci & Ryan, 1985), the primary aim of the present study was to examine the motivational profiles in table tennis players and their composition by gender, country, trainin...

journal_title：Journal of sports sciences

authors： Chu TLA,Zhang T,Hung TM

更新日期：2018-12-01 00:00:00

abstract：:In this study, we examine the effect of exercise on the time and flow characteristics of the respiratory cycle profile at the point of volitional exercise termination. Eight males (mean age 29 years, s = 10; body mass 74 kg, s = 7; height 1.75 m, s = 0.04) undertook a cycle test to volitional exhaustion on a cycle erg...

journal_title：Journal of sports sciences

authors： Kift J,Williams EM

更新日期：2007-12-01 00:00:00

abstract：:The causes of fatigue during muscular exercise include factors that reside in the brain (central mechanisms) as well as the muscles themselves (peripheral mechanisms). Central fatigue is largely unexplored, but there is increasing evidence that increased brain serotonin (5-HT) can lead to central (mental) fatigue, the...

journal_title：Journal of sports sciences

authors： Davis JM

更新日期：1995-07-01 00:00:00

abstract：:Many of the factors identified as influencing the home advantage have an underlying social basis, presumably through the influence exerted by the home crowd. Beliefs in the home advantage and the causes of that advantage also have a social basis: sports coverage and fan discourse focus on some aspects of the phenomeno...

journal_title：Journal of sports sciences

authors： Smith DR

更新日期：2005-04-01 00:00:00

abstract：:Interval exercise training is increasingly recommended to improve health and fitness; however, it is not known if cardiovascular risk is different from continuous exercise protocols. This systematic review with meta-analyses assessed the effect of a single bout of interval exercise on cardiovascular responses that ind...

journal_title：Journal of sports sciences

authors： Price KJ,Gordon BA,Bird SR,Benson AC

更新日期：2020-05-01 00:00:00

abstract：:In the present study, we examined the influence of shoe lacing on foot biomechanics in running. Twenty experienced rearfoot runners ran in six different lacing conditions across a force platform at a speed of 3.3 m . s(-1). Foot pronation during contact, tibial acceleration, and plantar pressure distribution of the ri...

journal_title：Journal of sports sciences

authors： Hagen M,Hennig EM

更新日期：2009-02-01 00:00:00

abstract：:The birth date distributions of elite male and female footballers in Australia, from junior youth (age 14 and upwards) to senior (professional) players, were examined. A statistically significant relative age effect was found among junior male players, reducing in effect with increasing age. An inter-year relative age...

journal_title：Journal of sports sciences

authors： van den Honert R

更新日期：2012-01-01 00:00:00

abstract：:This study was undertaken to examine the acute effect of interferential current on mechanical pain threshold and isometric peak torque after delayed onset muscle soreness induction in human hamstrings. Forty-one physically active healthy male volunteers aged 18-33 years were randomly assigned to one of two experimenta...

journal_title：Journal of sports sciences

authors： Rocha CS,Lanferdini FJ,Kolberg C,Silva MF,Vaz MA,Partata WA,Zaro MA

更新日期：2012-01-01 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：:Many sports events require participants to exert a maximal effort in the closing stages-that is, after prior fatiguing exercise. Peak and mean pedalling rate during 30 s of high-intensity cycle ergometer exercise was manipulated by altering the applied resistance or the initial exercise intensity so that the effect of...

journal_title：Journal of sports sciences

authors： Cherry PW,Lakomy HK,Nevill ME,Maddox NL

更新日期：1997-04-01 00:00:00

abstract：:Fundamental movement skills (FMS) are the basic building blocks of more advanced, complex movements required to participate in physical activity. This study examined FMS proficiency across the full range of Irish primary school children (n = 2098, 47% girls, age range 5-12 years). Participants were assessed using the ...

journal_title：Journal of sports sciences

authors： Behan S,Belton S,Peers C,O'Connor NE,Issartel J

更新日期：2019-11-01 00:00:00

abstract：:In this study, we examined (1) the relationship between self-talk and affect and (2) the nature of motivating self-talk. Ninety high-school athletes completed the Affect Grid and the Self-Talk Grid before practice and competition. Significant positive second-order partial correlations of low to moderate strength offer...

journal_title：Journal of sports sciences

authors： Hardy J,Hall CR,Alexander MR

更新日期：2001-07-01 00:00:00

abstract：:Accurate measures of heart rate (HR) during rehabilitation and sporting activities are important for precise exercise prescription to maintain or increase capacity. Wrist-worn activity monitors utilizing photoplethysmography technology (PPG) to configure HR show discrepant findings regarding validity depending on the ...

journal_title：Journal of sports sciences

authors： Støve MP,Haucke E,Nymann ML,Sigurdsson T,Larsen BT

更新日期：2019-04-01 00:00:00

abstract：:Officiating bias is thought to contribute to home advantage. Recent research has shown that sports with subjective officiating tend to experience greater home advantage and that referees' decisions can be influenced by crowd noise, but little work has been done to examine whether individual referees vary in their home...

journal_title：Journal of sports sciences

authors： Boyko RH,Boyko AR,Boyko MG

更新日期：2007-09-01 00:00:00

abstract：:Propulsive forces are important determinants of swimming performance. The aim of this study was to quantify the measurement error (uncertainty) in propulsive forces calculated from kinematic data. Ten operators digitized underwater video recordings of a breaststroke swimmer's right arm action. Four landmarks on the ha...

journal_title：Journal of sports sciences

authors： Payton CJ,Bartlett RM

更新日期：1995-12-01 00:00:00

abstract：:The aim of this study was to investigate the effects of adding vertical/horizontal plyometrics to the soccer training routine on jumping and sprinting performance in U-20 soccer players. The vertical jumping group (VJG) performed countermovement jumps (CMJ), while the horizontal jumping group (HJG) executed horizontal...

journal_title：Journal of sports sciences

authors： Loturco I,Pereira LA,Kobal R,Zanetti V,Kitamura K,Abad CC,Nakamura FY

更新日期：2015-01-01 00:00:00

abstract：:Anterior cruciate ligament (ACL) rupture, during ski-landing, is caused by excessive knee joint forces and kinematics, like anterior tibial translation, internal tibial rotation, and valgus rotation. It is not well understood how these forces/kinematics are directly related to ski-landing impact. In the present study,...

journal_title：Journal of sports sciences

authors： Yeow CH,Kong CY,Lee PV,Goh JC

更新日期：2011-08-01 00:00:00

abstract：:Recent research has challenged the typical pre-match and half-time (HT) interval warm-up (WU) routines currently used by professional soccer players. This study surveyed 2010/11 season WU strategies and their underpinning scientific reasoning and situational factors via an internet-based questionnaire, which was distr...

journal_title：Journal of sports sciences

authors： Towlson C,Midgley AW,Lovell R

更新日期：2013-01-01 00:00:00

abstract：:Ubiquitous (pervasive) computing is a term for a synergetic use of sensing, communication and computing. Pervasive use of computing has seen a rapid increase in the current decade. This development has propagated in applied sport science and everyday life. The work presents a survey of recent developments in sport and...

journal_title：Journal of sports sciences

authors： Baca A,Dabnichki P,Heller M,Kornfeind P

更新日期：2009-10-01 00:00:00