Abstract：
:The purpose of this study was to investigate the influence of shaft stiffness on grip and clubhead kinematics. Two driver shafts with disparate levels of stiffness, but very similar inertial properties, were tested by 33 golfers representing a range of abilities. Shaft deflection data as well as grip and clubhead kinematics were collected from 14 swings, with each shaft, for each golfer using an optical motion capture system. The more flexible shaft (R-Flex) demonstrated a higher contribution to clubhead speed from shaft deflection dynamics (P < .001), but was also associated with significantly less grip angular velocity at impact (P = .001), resulting in no significant difference in clubhead speed (P = .14). However, at the individual level, half of the participants demonstrated a significant difference in clubhead speed between shafts. The more flexible shaft was also associated with significantly different magnitudes of head rotation relative to the grip. More specifically, both bend loft (P < .001) and bend lie (P < .001) were greater for the R-Flex shaft, while bend close (P = .017) was greater for the stiffer (X-Flex) shaft. However, changes in grip orientation resulted in no significant differences in face orientation, between the shafts, at impact.
journal_name
J Sports Scijournal_title
Journal of sports sciencesauthors
MacKenzie SJ,Boucher DEdoi
10.1080/02640414.2016.1157262subject
Has Abstractpub_date
2017-01-01 00:00:00pages
105-111issue
2eissn
0264-0414issn
1466-447Xjournal_volume
35pub_type
杂志文章abstract：:Ghrelin is a hormone that stimulates hunger. Intense exercise has been shown to temporarily suppress hunger after exercise. In the present study, we investigated whether post-exercise hunger suppression is mediated by reduced plasma total ghrelin concentrations. Nine men and nine women participated in the study. Their...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410600831856
更新日期：2007-04-01 00:00:00
abstract：:In the collision between a striking implement and ball, the term "sweet spot" represents the impact location producing best results. In football kicking, it is not known if a sweet spot exists on the foot because no method to measure impact location in three-dimensional space exists. Therefore, the aims were: (1) deve...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2018.1505408
更新日期：2019-02-01 00:00:00
abstract：:Collective efficacy research has begun to progress from simply trying to verify the relationship between collective efficacy and performance to examining the mechanisms through which collective efficacy impacts on performance. To test hypotheses concerning the impact of collective efficacy on group goal selection and ...
journal_title：Journal of sports sciences
pub_type： 临床试验,杂志文章
doi：10.1080/02640410050074386
更新日期：2000-06-01 00:00:00
abstract：:An analysis system for barbell weightlifting exercises is proposed to record reliable performance and neuromuscular responses. The system consists of surface electromyography (sEMG) synchronized with electrogoniometry and a barbell position transducer. The purpose of this study was to establish the reliability of the ...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2011.588956
更新日期：2011-10-01 00:00:00
abstract：:Relationships between skeletal maturation and fundamental motor skills and gross motor coordination were evaluated in 429 children (213 boys and 216 girls) 7-10 years. Skeletal age was assessed (Tanner-Whitehouse 2 method), and stature, body mass, motor coordination (Körperkoordinations Test für Kinder, KTK) and funda...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2014.977935
更新日期：2015-01-01 00:00:00
abstract：:The aim of this study was to determine whether endurance training in athletes induces airway inflammation and pulmonary function disorders. Respiratory pattern and function were analysed in ten healthy endurance runners at rest, during sub-maximal exercise, and during the recovery. Inflammatory cells and metabolites (...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410802123177
更新日期：2008-10-01 00:00:00
abstract：:Short-term changes in the blood leucocyte count after exercise are known to be dependent on the intensity of exercise performed. The aim of the present study was to investigate the effects of the duration of high-intensity exercise on changes in the leucocyte and platelet count during the early recovery period. On sep...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640419508732219
更新日期：1995-04-01 00:00:00
abstract：:Although it is acknowledged that appropriate breast support during exercise is important, no published literature has assessed breast support usage in a cohort of female marathon runners. This study aimed to identify sport bra use and perceived importance of sports bra use in female marathon runners. Bra satisfaction,...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2013.844348
更新日期：2014-01-01 00:00:00
abstract：:The purpose of this study was to investigate the effect of an imagery training programme on the performance of a soccer task by skilled and novice players. An initial assessment of performance on the soccer task was undertaken, and then 22 skilled and 22 novice players were equally and randomly assigned to either a co...
journal_title：Journal of sports sciences
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1080/02640419308729971
更新日期：1993-04-01 00:00:00
abstract：:This study aimed to evaluate the autonomic modulation of heart rate in sedentary paraplegics and paraplegic wheelchair basketball players with thoracic spinal cord injury below T6. Seven paraplegic wheelchair basketball players (active paraplegic group), five paraplegics who were not involved in regular exercise (sede...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2012.734917
更新日期：2013-01-01 00:00:00
abstract：:The human spleen shows a decrease in volume of around 40% early during vigorous exercise and in response to other stressful stimuli such as maximal apnoea and the breathing of hypoxic gas mixtures. Contraction seems an active response, mediated by alpha-adrenergic fibres in the splenic nerve. Given the relatively smal...
journal_title：Journal of sports sciences
pub_type： 杂志文章,评审
doi：10.1080/02640414.2015.1078488
更新日期：2016-01-01 00:00:00
abstract：:The purposes of this study were to examine the effects of varying levels of goals on increasing daily steps and the frequency of goal achievement among middle-aged adults. Ninety-six adults participated in a randomised control study. Participants were randomly assigned to five different step goal groups: (1) Easy (n =...
journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
doi：10.1080/02640414.2016.1140218
更新日期：2016-10-01 00:00:00
abstract：:The number and type of landings performed after blocking during volleyball matches has been related to the potential risk of ACL injury. The aim of the present study was to determine whether gender affects the frequency of specific blocking landing techniques with potential risk of ACL injury from the perspective of f...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2017.1346817
更新日期：2018-04-01 00:00:00
abstract：:The study examined Yo-Yo intermittent recovery level 2 (YYIR2) and submaximal YYIR1 test performances in 172 male semi-professional football players (age; 25.8 ± 4.1 years) representing all teams in a top league at pre-season, start-season, mid-season and end-season. YYIR2 performance was 847 ± 227 m (±SD) at pre-seas...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2013.824598
更新日期：2014-01-01 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
pub_type： 杂志文章,评审
doi：10.1080/02640410903277427
更新日期：2009-10-01 00:00:00
abstract：:In this article, we present a critical review of the swimming literature on body roll, for the purposes of summarizing and highlighting existing knowledge, identifying the gaps and limitations, and stimulating further research. The main research findings can be summarized as follows: swimmers roll their shoulders sign...
journal_title：Journal of sports sciences
pub_type： 杂志文章,评审
doi：10.1080/02640410903508847
更新日期：2010-02-01 00:00:00
abstract：:Waist girth is recognised as a better predictor of obesity, particularly abdominal obesity, compared to other measures. Although several protocols for waist girth exist, arm position is either ignored, or not specified in unambiguous terms. Therefore, the purpose of this study was to determine if arm position influenc...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2013.781664
更新日期：2013-01-01 00:00:00
abstract：:Deci and Ryan's causality orientations theory suggests that there are individual differences in motivational orientation towards initiating and regulating behaviour. They described three causality orientations: autonomy, control and impersonal. The aim of this paper is to describe the development and concurrent validi...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/026404101300149393
更新日期：2001-06-01 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
pub_type： 杂志文章
doi：10.1080/02640410500230811
更新日期：2006-06-01 00:00:00
abstract：:In this paper we report on two studies that investigated the physical demands of professional rugby league match-play. Instudy one, National Rugby League (NRL) and National Youth Competition (NYC) players underwent global positioning system (GPS) analysis during competitive matches. No differences (P > 0.05) were obse...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2013.773401
更新日期：2013-01-01 00:00:00
abstract：:Although the relative age effect has been widely observed in youth sports (Musch & Grondin, 2001), it is unclear whether it generalizes across the lifespan. The purpose of this study was to examine the relative age effect among a population of Masters athletes using archived data. Two successive studies examined the f...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410601110128
更新日期：2007-10-01 00:00:00
abstract：:In this study, we investigated whether video modelling can enhance gymnasts' performance of the circle on a pommel horse. The procedure associated expert-modelling with self-modelling and quantitative performance analysis. Sixteen gymnasts were randomly assigned to one of two groups: (1) a modelling group, which recei...
journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
doi：10.1080/02640410500432243
更新日期：2006-10-01 00:00:00
abstract：:Physical activity is important in obesity prevention, but the effectiveness of different physical activity modalities remains to be determined among children. The main purpose of this study was to compare the effects of a 6-month soccer programme and a traditional physical activity programme on changes in body composi...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2016.1140219
更新日期：2016-10-01 00:00:00
abstract：:Process-oriented motor competence (MC) assessments evaluate how a movement is performed. Product-oriented assessments evaluate the outcome of a movement. Determining the concurrent validity of process and product assessments is important to address the predictive utility of motor competence for health. The current stu...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2016.1183803
更新日期：2017-04-01 00:00:00
abstract：:Free radical production increases during exercise and oxidative damage occurs in several tissues. We examined the effects of three different exercise tests on the pattern of change of erythrocyte enzyme antioxidant activities. The tests were a short maximal exercise test, a submaximal prolonged exercise test and a cyc...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410410001716724
更新日期：2005-01-01 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
pub_type： 杂志文章
doi：10.1080/02640419508732261
更新日期：1995-12-01 00:00:00
abstract：:This study analysed whether a significant relationship exists between the torque and muscle thickness and pennation angle of the erector spinae muscle during a maximal isometric lumbar extension with the lumbar spine in neutral position. This was a cross-sectional study in which 46 healthy adults performed three repet...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2014.924054
更新日期：2014-01-01 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
pub_type： 杂志文章
doi：10.1080/026404101317108462
更新日期：2001-12-01 00:00:00
abstract：:Mental preparation has long been thought of as an important aspect of physical performance, especially in tasks requiring muscular strength. Recent studies in sport psychology have addressed this issue, mainly through the investigation of 'psych-up' strategies and effects. The overall trend in such experiments support...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640418508729733
更新日期：1985-04-01 00:00:00
abstract：:The effect of alcohol ingestion before exercise on blood haemostasis is not known. The present study examined the effects of moderate alcohol ingestion on blood haemostatic variables at rest and in response to exercise. Eleven normal healthy individuals randomly performed two tests separated by 7 days. A moderate dose...
journal_title：Journal of sports sciences
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1080/026404199365821
更新日期：1999-06-01 00:00:00
