Abstract:
PURPOSE:To evaluate the relative importance and predictive ability of salivary immunoglobulin A (s-IgA) measures with regards to upper respiratory illness (URI) in youth athletes. METHODS:Over a 38-week period, 22 youth athletes (age = 16.8 [0.5] y) provided daily symptoms of URI and 15 fortnightly passive drool saliva samples, from which s-IgA concentration and secretion rate were measured. Kernel-smoothed bootstrapping generated a balanced data set with simulated data points. The random forest algorithm was used to evaluate the relative importance (RI) and predictive ability of s-IgA concentration and secretion rate with regards to URI symptoms present on the day of saliva sampling (URIday), within 2 weeks of sampling (URI2wk), and within 4 weeks of sampling (URI4wk). RESULTS:The percentage deviation from average healthy s-IgA concentration was the most important feature for URIday (median RI 1.74, interquartile range 1.41-2.07). The average healthy s-IgA secretion rate was the most important feature for URI4wk (median RI 0.94, interquartile range 0.79-1.13). No feature was clearly more important than any other when URI symptoms were identified within 2 weeks of sampling. The values for median area under the curve were 0.68, 0.63, and 0.65 for URIday, URI2wk, and URI4wk, respectively. CONCLUSIONS:The RI values suggest that the percentage deviation from average healthy s-IgA concentration may be used to evaluate the short-term risk of URI, while the average healthy s-IgA secretion rate may be used to evaluate the long-term risk. However, the results show that neither s-IgA concentration nor secretion rate can be used to accurately predict URI onset within a 4-week window in youth athletes.
journal_name
Int J Sports Physiol Performauthors
Sawczuk T,Jones B,Welch M,Beggs C,Scantlebury S,Till Kdoi
10.1123/ijspp.2019-0804subject
Has Abstractpub_date
2021-01-13 00:00:00pages
1-6eissn
1555-0265issn
1555-0273pii
ijspp.2019-0804pub_type
杂志文章abstract:PURPOSE:To establish appropriate work intensity for interval training that would elicit maximal oxygen uptake (VO2max) for well-trained swimmers. METHODS:Twelve male competitive swimmers completed an incremental protocol to determine the minimum velocity at VO2max (νVO2max) and, in randomized order, 3 square-wave exer...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0475
更新日期:2017-08-01 00:00:00
abstract:PURPOSE:The study aimed to analyze the validity and reliability of commercially available nondifferential Global Positioning System (NdGPS) devices for measures of total distance during linear, multidirectional and soccer-specific motion at 1-Hz and 5-Hz sampling frequencies. METHODS:Linear (32 trials), multidirection...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.5.4.448
更新日期:2010-12-01 00:00:00
abstract:PURPOSE:The aim of the study was to determine the effect of supramaximal exercise intensity during constant work-rate cycling to exhaustion on the accumulated oxygen deficit (AOD) and to determine the test-retest reliability of AOD. METHODS:Twenty-one trained male cyclists and triathletes (mean ± SD for age and maxima...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0343
更新日期:2017-03-01 00:00:00
abstract:PURPOSE:To compare the training-volume (TrV) distribution of Russian international-level male biathletes, female biathletes, and cross-country skiers (XC) during an annual cycle. METHODS:Day-to-day TrVs were recorded and averaged for a 5-year period for male biathletes (n = 6), female biathletes (n = 8), and XC (n = 1...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0220
更新日期:2020-08-19 00:00:00
abstract:PURPOSE:To evaluate the effect of simulated soccer on the hamstrings eccentric torque-angle profile and angle of peak torque (APTeccH), and on the hamstrings:quadriceps torque ratio at specific joint angles (ASHecc:Qcon). METHODS:The authors assessed dominant-limb isokinetic concentric and eccentric knee flexion and c...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0088
更新日期:2015-04-01 00:00:00
abstract:UNLABELLED:There is a great deal of research on the responses to resistance training; however, information on the responses to strength and power training conducted by elite strength and power athletes is sparse. PURPOSE:To establish the acute and 24-h neuromuscular and kinematic responses to Olympic-style barbell str...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0235
更新日期:2016-04-01 00:00:00
abstract:PURPOSE:To assess the net effects of strength training on middle- and long-distance performance through a meta-analysis of the available literature. METHODS:Three databases were searched, from which 28 of 554 potential studies met all inclusion criteria. Standardized mean differences (SMDs) were calculated and weighte...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章,meta分析
doi:10.1123/ijspp.2017-0032
更新日期:2018-01-01 00:00:00
abstract::The theory of deliberate practice postulates that experts are always made, not born. This theory translated to the youth-sport domain means that if athletes want to be high-level performers, they need to deliberately engage in practice during the specialization years, spending time wisely and always focusing on tasks ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章,评审
doi:10.1123/ijspp.7.4.390
更新日期:2012-12-01 00:00:00
abstract:CONTEXT:Drop jumps and high-intensity interval running are relevant training methods to improve explosiveness and endurance performance, respectively. Combined training effects might, however, be achieved by performing interval drop jumping. PURPOSE:To determine the acute effects of interval drop jumping on oxygen upt...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0031
更新日期:2019-10-17 00:00:00
abstract:PURPOSE:To analyze the reliability and validity of a simple computation method to evaluate force (F), velocity (v), and power (P) output during a countermovement jump (CMJ) suitable for use in field conditions and to verify the validity of this computation method to compute the CMJ force-velocity (F-v) profile (includi...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0484
更新日期:2017-01-01 00:00:00
abstract:PURPOSE:This study aimed to compare the effects of 5 different 18-week in-season strength training programs on strength gains and specific water polo performance. METHODS:A total of 56 young male water polo players were randomly assigned to the following 5 training groups: dry-land strength training, in-water-specific...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2020-0046
更新日期:2021-01-28 00:00:00
abstract:PURPOSE:Self-report (SR) has been the primary method used to assess fluid intake during endurance events, but unfortunately, little is known about the validity of SR. The purpose of this study was to compare SR fluid intake with direct measurement (DM) during a 70.3-mile triathlon. METHODS:Fifty-three (42 men, 11 wome...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0358
更新日期:2015-07-01 00:00:00
abstract:CONTEXT:Several studies report static-stretch-induced deficits and dynamic-stretch performance improvement after intervention. PURPOSE:To investigate the muscle activation of the forehand and backhand in table tennis players after experiencing static- and dynamic-stretching protocols. METHODS:A total of 24 elite male...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0768
更新日期:2020-11-12 00:00:00
abstract:PURPOSE:The aim of this study was to compare VO2 kinetics during constant power cycle exercise measured using a conventional facemask (CM) or a respiratory snorkel (RS) designed for breath-by-breath analysis in swimming. METHODS:VO2 kinetics parameters-obtained using CM or RS, in randomized counterbalanced order-were ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章,随机对照试验
doi:10.1123/ijspp.5.3.292
更新日期:2010-09-01 00:00:00
abstract:PURPOSE:Foot-strike patterns (FSP) in running are related to certain impact kinetics during ground contact. A rear-foot strike (RFS) has been associated with higher impact forces, whereas a forefoot strike (FFS) is assumed to minimize these impact forces. This study investigated the effects of running with RFS or FFS o...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0584
更新日期:2019-12-19 00:00:00
abstract:PURPOSE:To establish the validity of smartphone photoplethysmography (PPG) and heart-rate sensor in the measurement of heart-rate variability (HRV). METHODS:29 healthy subjects were measured at rest during 5 min of guided breathing and normal breathing using smartphone PPG, a heart-rate chest strap, and electrocardiog...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0668
更新日期:2017-11-01 00:00:00
abstract:UNLABELLED:The contractile history of muscle can potentiate electrically evoked force production. A link to voluntary force production, related in part to an increase in reflex excitability, has been suggested. PURPOSE:Our purpose was to quantify the effect of postactivation potentiation on voluntary force production ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.3.2.219
更新日期:2008-06-01 00:00:00
abstract:PURPOSE:To quantify the impact of training-intensity distribution on 10K performance in recreational athletes. METHODS:30 endurance runners were randomly assigned to a training program emphasizing low-intensity, sub-ventilatory-threshold (VT), polarized endurance-training distribution (PET) or a moderately high-intens...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章,随机对照试验
doi:10.1123/ijspp.2012-0350
更新日期:2014-03-01 00:00:00
abstract::The purpose of this study was to compare the pacing profiles between distance- and duration-based trials of short and long duration. Thirteen trained cyclists completed 2 time-based (6 and 30 min) and 2 distance-based (4 and 20 km) self-paced cycling time trials. Participants were instructed to complete each trial wit...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0613
更新日期:2016-11-01 00:00:00
abstract:PURPOSE:To assess differences in event-specific specialization between elite African and non-African male marathon runners based on age, performance, and career length. METHODS:The top 90 African marathoners from 2001 to 2015 were compared with the top 90 non-African marathoners from the same time period across variou...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0069
更新日期:2018-01-01 00:00:00
abstract:PURPOSE:To investigate the physical and physiological response to different formats of various-sided games. METHODS:Eighteen elite women's soccer players wore 15-Hz global positioning system devices and heart-rate (HR) monitors during various-sided games (small, 4 vs 4 and 5 vs 5; medium, 6 vs 6 and 7 vs 7; large, 8 v...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0087
更新日期:2016-10-01 00:00:00
abstract:PURPOSE:To investigate if error-correction-processing (ECP) algorithms in timing lights are able to eliminate or reduce measurement errors (MEs) and false signals due to swinging arms or legs. METHODS:First, a dummy was used to check if ECP generally works. Second, 15 male sport students performed sprints over 5 and 1...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0596
更新日期:2018-11-26 00:00:00
abstract:PURPOSE:The purpose of this study was to analyze the effects of high-level competition on salivary free cortisol, countermovement jump (CMJ), and rating of perceived exertion (RPE) and the relationships between these fatigue indicators in a group of elite middle- and long-distance runners. METHOD:The salivary free cor...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2013-0539
更新日期:2014-09-01 00:00:00
abstract::Despite some advances, it remains largely unknown how the millions of variations in the human genome influence athletic performance (especially in endurance events), and no single genetic test can really predict sports talent. However, there is experimental evidence from animal research that selecting for even a simpl...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0421
更新日期:2016-10-01 00:00:00
abstract::Thompson and Cooper1 observed that improvements in the swimming speed at 2-mM and 6-mM lactate concentration coincided with improvements in competitive breaststroke performances, whereas Pyne et al concluded that changes in swimming speed at lactate threshold were not directly associated with competition performances ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.1.2.172
更新日期:2006-06-01 00:00:00
abstract:PURPOSE:Ischemic preconditioning (IPC) through purposeful circulatory occlusion may enhance exercise performance. The value of IPC for improving performance is controversial owing to challenges with employing effective placebo controls. This study examines the efficacy of IPC versus a deceptive sham protocol for improv...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0290
更新日期:2019-10-11 00:00:00
abstract:PURPOSE:Caffeine is frequently used by athletes as an ergogenic aid. Various alternate forms of caffeine administration are available, which may produce different effects. This investigation compares the effects of different forms of caffeine supplementation on 5-km running performance, and the relationship between ath...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0287
更新日期:2019-10-11 00:00:00
abstract:PURPOSE:The aim of the study was to examine the effect of fatigue, developed during prolonged high-intensity intermittent exercise, on the performance of soccer shooting and dribbling skill. METHODS:Nine semiprofessional soccer players with a mean age of 20.7+/-1.4 years volunteered to participate in the study. Partic...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.4.2.163
更新日期:2009-06-01 00:00:00
abstract:PURPOSE:To determine the consistency of commercially available devices used for measuring elevation gain in outdoor activities and sports. METHODS:Two separate observational validation studies were conducted. Garmin (Forerunner 310XT, Edge 500, Edge 750, and Edge 800; with and without elevation correction) and SRM (Po...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2013-0232
更新日期:2014-09-01 00:00:00
abstract:PURPOSE:To verify whether relative age effects (RAEs) occur among young male and female Swiss Alpine skiers of different age groups and performance levels. In addition, the efficacy of normalizing performance in physical tests to height and body mass to attenuate RAEs eventually present was tested. METHODS:The Swiss S...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0418
更新日期:2016-05-01 00:00:00