Abstract:
:Thai ginseng, Kaempferia parviflora, is widely believed among the Mong hill tribe to reduce perceived effort and improve physical work capacity. Kaempferia parviflora is consumed before their daily work. Therefore, we conducted an acute study on the effects of K. parviflora on repeated bouts of sprint exercise and on endurance exercise time to exhaustion. Two studies were conducted in college males using a randomized, double-blind, crossover design. Ninety minutes after consumption of K. parviflora or a starch placebo, participants in study 1 (n = 19) completed three consecutive maximum 30-s sprint cycling Wingate tests, separated by 3 min recovery, while participants in study 2 (n = 16) performed submaximal cycling exercise to exhaustion. Peak and mean power output decreased with successive Wingate tests, while percent fatigue and blood lactate concentration increased after the third Wingate test (P < 0.05). There were no detectable differences in any measures with or without K. parviflora. There was also no effect of K. parviflora on time to exhaustion, rating of perceived exertion or heart rate during submaximal exercise. Our results indicate that acute ingestion of K. parviflora failed to improve exercise performance during repeated sprint exercise or submaximal exercise to exhaustion. However, chronic effects or actions in other populations cannot be excluded.
journal_name
J Sports Scijournal_title
Journal of sports sciencesauthors
Wasuntarawat C,Pengnet S,Walaikavinan N,Kamkaew N,Bualoang T,Toskulkao C,McConell Gdoi
10.1080/02640414.2010.506221subject
Has Abstractpub_date
2010-09-01 00:00:00pages
1243-50issue
11eissn
0264-0414issn
1466-447Xpii
926950523journal_volume
28pub_type
杂志文章,随机对照试验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
pub_type: 临床试验,杂志文章
doi:10.1080/02640414.2011.578146
更新日期:2011-08-01 00:00:00
abstract::This study aimed to verify the effect of a multicomponent intervention on cardiometabolic risk factors (CMRF), and to determine the prevalence of responders on CMRF among children and adolescents with overweight/obesity. This is a quasi-experimental study, developed with 35 children and adolescents with overweight/obe...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2020.1725384
更新日期:2020-03-01 00:00:00
abstract::A regression analysis of competitors' tournament results in relation to their world rankings was proposed to identify the effect of home advantage in international 'grand-slam' tennis and 'major' golf tournaments. The results provided little evidence of home advantage in either the grand-slam tennis or the golf tourna...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/026404197367227
更新日期:1997-08-01 00:00:00
abstract::Coordinative variability (CAV) and underlying coordinative patterns are potential running-related overuse injury (RROI) mechanisms, but prospective analyses are needed. This study compared lower limb CAV and coordinative patterns between prospectively injured and uninjured runners. Knee, shank, and ankle kinematics we...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2020.1804519
更新日期:2021-01-01 00:00:00
abstract::Protease supplementation has been shown to attenuate soft tissue injury resulting from intense exercise. The aim of this study was to evaluate the effects of protease supplementation on muscle soreness and contractile performance after downhill running. Ten matched pairs of male participants ran at a -10% grade for 30...
journal_title:Journal of sports sciences
pub_type: 临床试验,杂志文章
doi:10.1080/02640410310001641584
更新日期:2004-04-01 00:00:00
abstract::The aims of this study were to determine the influence of an 8-over spell on cricket fast bowling technique and performance (speed and accuracy), and to establish the relationship of selected physical capacities with technique and performance during an 8-over spell. Fourteen first-grade fast bowlers with a mean age of...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/026404100446801
更新日期:2000-12-01 00:00:00
abstract::An evaluation of a six-week Combined minimal footwear transition and gait-retraining combination vs. gait retraining only on impact characteristics and leg stiffness. Twenty-four trained male runners were randomly assigned to either (1) Minimalist footwear transition Combined with gait-retraining over a six-week perio...
journal_title:Journal of sports sciences
pub_type: 杂志文章,随机对照试验
doi:10.1080/02640414.2016.1224916
更新日期:2017-08-01 00:00:00
abstract::This study aimed to investigate deprivation and sex differences in selected health-relatedfitness measures in 9-12-year-old children. Data were captured on 3,407 children (49.3% boys; aged 10.5 ± 0.6 years). Cardiorespiratory fitness(20 m multistage shuttle run test; 20 m MSRT), muscular strength (handgrip strength) a...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2019.1681230
更新日期:2020-01-01 00:00:00
abstract::Assessments of maximal intensity exercise which determine peak power output on friction-baked cycle ergometers have fallen into two categories: correction procedures which account for changes in momentum of the ergometer's flywheel and optimization procedures which attempt to satisfy muscle force-velocity relationship...
journal_title:Journal of sports sciences
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1080/02640419608727738
更新日期:1996-12-01 00:00:00
abstract::Maximal oxygen uptake VO(2max)) is considered the optimal method to assess aerobic fitness. The measurement of VO(2max), however, requires special equipment and training. Maximal exercise testing with determination of maximal power output offers a more simple approach. This study explores the relationship between [Vdo...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640410802199789
更新日期:2008-11-01 00:00:00
abstract::The aim of this study was to explore the relationships between dimensions of social support and components of performance in tennis. A post-match performance measure was completed by 144 British tournament tennis players. Principal components analysis yielded eight components, labelled Execution of (Flexible) Plan, Lo...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/026404199365948
更新日期:1999-05-01 00:00:00
abstract::Muscle imbalance and deficit are key parameters for guiding rehabilitation and sports sessions and avoiding injuries. However, the high cost and non-portable nature of most instruments employed for muscle strength assessment frequently hamper an affordable evaluation in field conditions. This study evaluated the valid...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2019.1594570
更新日期:2019-08-01 00:00:00
abstract::Low-intensity exercise with blood flow restriction (BFR) is an increasingly common method of improving muscular strength and hypertrophy, and improving aerobic fitness, in clinical and athletic populations. The aim of this systematic review was to describe common approaches to determining occlusion pressures for BFR e...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2020.1840734
更新日期:2020-11-01 00:00:00
abstract::For the first time we aimed to: (1) assess fat-free mass (FFM) and RMR in youth soccer players, (2) compare measured RMR to estimated RMR using previously published prediction equations, and (3) develop a novel population-specific prediction equation. In a cross-sectional design, 99 males from a Premier League academy...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2020.1717286
更新日期:2020-01-01 00:00:00
abstract::In two retroactive interference experiments, we assessed the effect of mentally imagined movement speed on subsequent motor performance. All participants performed a sequential motor action at three speeds during a baseline test and a retention test. During the retention interval of Experiment 1, the participants (n =...
journal_title:Journal of sports sciences
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1080/02640410050082305
更新日期:2000-08-01 00:00:00
abstract::Organisational stressors are associated with positive and negative outcomes in extant literature; however, little is known about which demands predict which outcomes. Extant theory and literature also suggests that coping style may influence an individual's resilience or vulnerability to stressors and, subsequently, t...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2016.1184299
更新日期:2017-04-01 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::An important goal of the athlete's everyday diet is to provide the muscle with substrates to fuel the training programme that will achieve optimal adaptation for performance enhancements. In reviewing the scientific literature on post-exercise glycogen storage since 1991, the following guidelines for the training diet...
journal_title:Journal of sports sciences
pub_type: 杂志文章,评审
doi:10.1080/0264041031000140527
更新日期:2004-01-01 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::In taekwondo, the stance position can potentially affect kick performance. The aim of this study was to analyse mechanical variables in the roundhouse kick in taekwondo according to three stance positions (0°, 45°, 90°). Nine experienced taekwondo athletes performed consecutive kicking trials in a random order accordi...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2013.803590
更新日期:2013-01-01 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
pub_type: 杂志文章,meta分析
doi:10.1080/02640414.2020.1767348
更新日期:2020-09-01 00:00:00
abstract::Cross-country skiing is a complex endurance sport requiring technical skills, in addition to considerable physiological and tactical abilities. This review aims to identify biomechanical factors that influence the performance of cross-country skiers. Four electronic databases were searched systematically for original ...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2020.1775375
更新日期:2020-09-01 00:00:00
abstract::This study addressed the paucity of evidence of whether visual anticipation can be improved in emerging experts in striking sports. Twelve emerging expert batsmen from a state cricket squad were equally randomised into intervention and control groups. They were pre-and-post tested on a video temporal occlusion test of...
journal_title:Journal of sports sciences
pub_type: 杂志文章,随机对照试验
doi:10.1080/02640414.2019.1621510
更新日期:2019-09-01 00:00:00
abstract::The aim of this study was to devise a valid performance analysis system for the assessment of the movement characteristics associated with competitive amateur boxing and assess its reliability using analysts of varying experience of the sport and performance analysis. Key performance indicators to characterise the dem...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2012.738922
更新日期:2013-01-01 00:00:00
abstract::The aims of this study were to compare the physiological and anthropometric characteristics of successful mountain bikers and professional road cyclists and to re-examine the power-to-weight characteristics of internationally competitive mountain bikers. Internationally competitive cyclists (seven mountain bikers and ...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/026404102321011760
更新日期:2002-12-01 00:00:00
abstract::The aim of this study was to determine the variations in substrate utilization between men and women matched for ventilatory threshold (Tvent) during incremental arm cranking and leg cycling exercise at 70, 85, 100 and 115% of the mode-specific Tvent. Recreationally active men (n=12) and women (n=10) with similar valu...
journal_title:Journal of sports sciences
pub_type: 临床试验,杂志文章
doi:10.1080/02640410500497709
更新日期:2006-12-01 00:00:00
abstract::The aim of this study was to establish the effectiveness of a resistance training programme, designed to improve vertical jumping ability, on the grab, swing and rear-weighted track starts in swimming. Twenty-three female non-competitive swimmers participated (age 19.9 +/- 2.4 years; mean +/- s). The diving techniques...
journal_title:Journal of sports sciences
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1080/0264041031000071047
更新日期:2003-03-01 00:00:00
abstract::State anxiety is known to affect far aiming tasks, but less is known about the effects of state anxiety on running and aiming while running. Therefore, in the current study participants ran on a treadmill at their preferred speed in a low- and high-anxiety condition. In both conditions, running was combined with dart ...
journal_title:Journal of sports sciences
pub_type: 杂志文章
doi:10.1080/02640414.2011.617386
更新日期:2012-01-01 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::Computers have played an important supporting role in the development of experimental and theoretical sports biomechanics. The role of the computer now extends from data capture and data processing through to mathematical and statistical modelling and simulation and optimization. This paper seeks to demonstrate that e...
journal_title:Journal of sports sciences
pub_type: 杂志文章,评审
doi:10.1080/02640419508732232
更新日期:1995-06-01 00:00:00