Abstract：
:The effects of exercise on the core musculature have not been investigated in prepubescents. The main purpose of the present study was to determine the volume and degree of asymmetry of rectus abdominis, obliques and transversus abdominis, quadratus lumborum, iliopsoas, gluteus and paravertebralis muscles in prepubescent tennis players and in untrained boys. The muscle volume was determined using magnetic resonance imaging (MRI) in 7 male prepubescent tennis players and 10 untrained controls (mean age 11.0 ± 0.8 years, Tanner 1-2). After accounting for height and body weight as covariates, the tennis players had 14-34% greater volume than the controls in all the muscles analysed (P < 0.05) except in paravertebralis, dominant quadratus lumborum and non-dominant gluteus, which had similar volumes in both groups (P = NS). Compared to controls, the tennis players displayed a greater degree of asymmetry in quadratus lumborum and rectus abdominis (3% vs. 15%, P < 0.01 and 8% vs. 17%, P = 0.06, respectively). The level of asymmetry of obliques and transversus abdominis, iliopsoas, gluteus and paravertebralis muscles was similar in both groups (P = NS). In conclusion, tennis playing at prepubertal ages induces a selective hypertrophy of the core musculature and exaggerates the degree of asymmetry of quadratus lumborum and rectus abdominis compared to untrained boys.
journal_name
J Sports Scijournal_title
Journal of sports sciencesauthors
Sanchis-Moysi J,Idoate F,Álamo-Arce D,Calbet JA,Dorado Cdoi
10.1080/02640414.2016.1189589subject
Has Abstractpub_date
2017-04-01 00:00:00pages
791-797issue
8eissn
0264-0414issn
1466-447Xjournal_volume
35pub_type
杂志文章abstract：:This study involved a systematic video analysis of 16 anterior cruciate ligament (ACL) injuries sustained by elite-level netball players during televised games in order to describe the game situation, the movement patterns involved, the player's behaviour, and a potential injury mechanism. Eight of the ACL injuries we...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2015.1121285
更新日期：2016-08-01 00:00:00
abstract：:The aim of the present study was to determine the effect of post-exercise ingestion of a unique, high molecular weight glucose polymer solution, known to augment gastric emptying and post-exercise muscle glycogen re-synthesis, on performance during a subsequent bout of intense exercise. On three randomized visits, eig...
journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
doi：10.1080/02640410701361548
更新日期：2008-01-15 00:00:00
abstract：:The purpose of this study was to determine the foot strike patterns (FSP), rearfoot position at initial contact (RPic, i.e., No INV/EVE) and foot rotation in children in relation to age. A total of 932 children aged 3 to 16 years participated in this study. A sagittal and frontal-plane video was recorded using a high-...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2018.1507237
更新日期：2019-03-01 00:00:00
abstract：:The aims of this study were to determine the validity of fat mass of the trunk as a predictor for visceral fat area at the umbilicus level and to develop equations to predict visceral fat mass at the umbilicus level using fat mass of the trunk measured by dual-energy X-ray absorptiometry (DXA) and bioelectrical impeda...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410600875010
更新日期：2007-05-01 00:00:00
abstract：:The aims in this review are: (1) to identify physiological determinants of performance; (2) to consider training specificity by examining aerobic, team and racket sports, strength and power activities, and cross-training and concurrent training methods; and (3) to evaluate the role of specificity in the physiological ...
journal_title：Journal of sports sciences
pub_type： 杂志文章,评审
doi：10.1080/02640410902729741
更新日期：2009-04-01 00:00:00
abstract：:The relationships between team performance indicators and match outcome have been examined in many team sports, however are limited in Australian Rules football. Using data from the 2013 and 2014 Australian Football League (AFL) regular seasons, this study assessed the ability of commonly reported discrete team perfor...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2015.1066026
更新日期：2016-01-01 00:00:00
abstract：:The purpose of this study was to capture the lower limb kinematics before during and after ball impact of soccer kicking by examining the influence of both sampling rate and smoothing procedures. Nine male soccer players performed maximal instep kicks and the three-dimensional leg movements were captured at 1000 Hz. A...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410400021450
更新日期：2006-01-01 00:00:00
abstract：:The prevalence of ischaemia-related symptoms is remarkably high among elite indoor volleyball players. Since the exposure to sport-specific demands may be higher in beach volleyball compared to indoor volleyball, the aim of this study was to assess the prevalence of ischaemia-related symptoms and associated risk facto...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2015.1093649
更新日期：2016-01-01 00:00:00
abstract：:A maximal multistage 20 m shuttle run test was designed to determine the maximal aerobic power of schoolchildren, healthy adults attending fitness class and athletes performing in sports with frequent stops and starts (e.g. basketball, fencing and so on). Subjects run back and forth on a 20 m course and must touch the...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640418808729800
更新日期：1988-07-01 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
pub_type： 杂志文章
doi：10.1080/02640414.2011.640705
更新日期：2012-01-01 00:00:00
abstract：:The aim of present study was to examine the relationships between serum and salivary values of free testosterone, dehydroepiandrosterone, and cortisol before and after a session of resistance exercise. Twenty-eight healthy men (mean age 40 years, s = 4) participated in the present study. Serum and salivary samples wer...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410801919526
更新日期：2008-08-01 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
pub_type： 杂志文章
doi：10.1080/02640414.2017.1409607
更新日期：2018-07-01 00:00:00
abstract：:This study aimed to compare the load-velocity and load-power relationships of three common variations of the squat exercise. 52 strength-trained males performed a progressive loading test up to the one-repetition maximum (1RM) in the full (F-SQ), parallel (P-SQ) and half (H-SQ) squat, conducted in random order on sepa...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2018.1544187
更新日期：2019-05-01 00:00:00
abstract：:Children and adolescents mature at different rates such that individuals competing in the same competition may differ in physical and biological maturity despite being of similar chronological age. Whether or not differences translate into on-field performance in competition is relatively unknown. This study investiga...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2013.843016
更新日期：2014-01-01 00:00:00
abstract：:Drag is the resistant force that opposes a swimmer displacing through water and significantly affects swimming performance. Drag experienced during active swimming is called active drag (Da), and its direct determination is still controversial. By contrast, drag experienced while gliding in a stable streamlined body p...
journal_title：Journal of sports sciences
pub_type： 杂志文章,评审
doi：10.1080/02640414.2018.1547099
更新日期：2019-05-01 00:00:00
abstract：:A calibration study was conducted to determine the threshold counts for two commonly used accelerometers, the ActiGraph and the Actical, to classify activities by intensity in children 5 to 8 years of age. Thirty-three children wore both accelerometers and a COSMED portable metabolic system during 15 min of rest and t...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410802334196
更新日期：2008-12-01 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
pub_type： 杂志文章
doi：10.1080/02640414.2015.1081394
更新日期：2015-01-01 00:00:00
abstract：:This study aimed to investigate swimmer's use and coach prescription of recovery strategies during training and competition while examining perceived challenges, barriers, and beliefs in the importance of their effectiveness. A mixed-methods sequential explanatory design was implemented. Thirty-seven male and 45 femal...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2020.1770925
更新日期：2020-09-01 00:00:00
abstract：:High Intensity Interval Training (HIIT) may be effective for accumulating VPA. However, the contribution of HIIT to overall physical activity is unknown. Our primary aim was to explore the impact of school-based HIIT on physical activity. The secondary aim was to explore within-individual changes in physical activity ...
journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
doi：10.1080/02640414.2017.1356026
更新日期：2018-05-01 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
pub_type： 杂志文章,评审
doi：10.1080/02640414.2011.565783
更新日期：2011-01-01 00:00:00
abstract：:Despite a growing body of evidence on the positive impact of sports science for golf, there is still a paucity of research investigating the "perceptions" and "practices" of high-skilled golfers. Professional Golfers' Association Assistant Professionals (future-qualified coaches; n = 430) were surveyed on their "perce...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2020.1737350
更新日期：2020-04-01 00:00:00
abstract：:This study investigated differences in lower-limb coordination and coordination variability between experienced and novice runners during a prolonged run. Thirty-four participants were categorised as either experienced (n = 17) or novice runners (n = 17). All participants performed a 31-min treadmill run at their indi...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2018.1539294
更新日期：2019-05-01 00:00:00
abstract：:This study investigated the effects of two different doses of caffeine on endurance cycle time trial performance in male athletes. Using a randomised, placebo-controlled, double-blind crossover study design, sixteen well-trained and familiarised male cyclists (Mean ± s: Age = 32.6 ± 8.3 years; Body mass = 78.5 ± 6.0 k...
journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
doi：10.1080/02640414.2011.632431
更新日期：2012-01-01 00:00:00
abstract：:The main purposes of this study were to investigate the acute effects of static and dynamic lower limb stretching routines: (a) on peak torque, total external work and joint angle at peak torque of the hamstrings during maximal eccentric isokinetic leg flexion; (b) on unilateral hamstring to quadriceps (H/Q) strength ...
journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
doi：10.1080/02640414.2012.751119
更新日期：2013-01-01 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
pub_type： 杂志文章
doi：10.1080/02640414.2014.942688
更新日期：2015-01-01 00:00:00
abstract：:The aim of this study was to assess fatigue during a simulated cross-country skiing sprint competition based on skating technique. Sixteen male skiers performed a 30-m maximal skiing speed test and four 850-m heats with roller skies on a tartan track, separated by 20 min recovery between heats. Physiological variables...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410903081860
更新日期：2009-08-01 00:00:00
abstract：:Stand-up paddle boarding (SUP) is a rapidly growing activity where only anecdotal evidence exists for its proposed health and fitness benefits. The purpose of this study was to profile elite and recreational SUP with respect to anthropometric, physiological and musculoskeletal measurements. A total of 30 SUP participa...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2015.1079331
更新日期：2016-01-01 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 International Paralympic Committee (IPC) and individual sports federations have established the need to develop evidence-based systems of classification for athletes with vision impairment (VI) that may differ depending on the visual demands of each sport. As a consequence, research has been conducted that led to ...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2020.1851923
更新日期：2020-12-15 00:00:00
abstract：:This study aims to assess fundamental movement skill (FMS) proficiency, physical self-confidence levels, and the relationship between these variables and gender differences among adolescents. Three hundred and ninety five adolescents aged 13.78 years (SD = ±1.2) from 20 schools were involved in this study. The Test of...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2016.1235280
更新日期：2017-09-01 00:00:00
