Abstract:
PURPOSE:This study investigated whether there is a correlation between time-trial performance and competitive performance capacity of male and female junior cross-country skiers and sought to explain sex-specific competitive performance capacity through multiple-regression modeling. METHODS:The International Ski Federation's (FIS) junior ranking points for distance (FISdist) and sprint (FISsprint) competitions were used as performance parameters. A total of 38 elite junior (age 18.5 ± 1.0 y) cross-country skiers (24 men and 14 women) completed 3 time-trial tests: a 3-km level-running time trial (TTRun), a 2-km moderate uphill (1.2° slope) roller-skiing time trial using the double-poling technique (TTDP), and a 2-km uphill (2.8° slope) roller-skiing time trial using the diagonal-stride technique (TTDiag). The correlations were investigated using Pearson correlation analysis, and regression models were created using multiple-linear-regression analysis. RESULTS:For men, FISsprint and FISdist were correlated with the times for TTRun, TTDP, and TTDiag (all P < .001). For women, FISsprint was correlated with the times for TTRun (P < .05), TTDP (P < .01), and TTDiag (P < .01), whereas FISdist was correlated only with the times for TTDP (P < .01) and TTDiag (P < .05). The models developed for FISdist and FISsprint explained 73.9-82.3% of the variance in the performance capacity of male junior cross-country skiers. No statistically valid regression model was found for the women. CONCLUSIONS:Running and roller-skiing time trials are useful tests for accurately predicting the performance capacity of junior cross-country skiers.
journal_name
Int J Sports Physiol Performauthors
Carlsson M,Carlsson T,Hammarström D,Malm C,Tonkonogi Mdoi
10.1123/ijspp.2012-0172subject
Has Abstractpub_date
2014-01-01 00:00:00pages
12-8issue
1eissn
1555-0265issn
1555-0273pii
2012-0172journal_volume
9pub_type
杂志文章abstract:CONTEXT:Muscle imbalances aid in the identification of athletes at risk for lower-extremity injury. Little is known regarding the influence that leg preference or playing position may have on lower-extremity muscle strength and asymmetry. PURPOSE:To investigate lower-extremity strength profiles in rugby union athletes...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0241
更新日期:2016-05-01 00:00:00
abstract::Recent psychophysiological models of endurance performance explained that pacing strategies and exercise-intensity regulation influence cyclists' ability to produce high mean power output (PO) during time trials (TTs). However, the relationships between these pacing strategies and psychological parameters of the athle...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0773
更新日期:2019-04-01 00:00:00
abstract:PURPOSE:Passive muscle tension is increased after damaging eccentric exercise. Hamstring-strain injury is associated with damaging eccentric muscle actions, but no research has examined changes in hamstring passive muscle tension throughout a simulated sport activity. The authors measured hamstring passive tension thro...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0009
更新日期:2016-07-01 00:00:00
abstract:CONTEXT:Although skin-temperature assessment has received much attention in recent years as a possible internal-load measurement, scientific evidence is scarce. PURPOSE:To analyze baseline skin temperature and its rewarming through means of a cold-stress test before and after performing a marathon and to study the ass...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0963
更新日期:2020-05-29 00:00:00
abstract:PURPOSE:To identify the effect of additional elastic force on the kinetic and kinematic characteristics, as well as the magnitude of leg stiffness, during the performance of accentuated countermovement jumps (CMJs). METHODS:Fifteen trained male subjects performed 3 types of CMJ including free CMJ (FCMJ; ie, body weigh...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.8.2.181
更新日期:2013-03-01 00:00:00
abstract::This study examined the influence of turn radius on velocity and energy profiles when skidding and step turning during more and less effective downhill turns while cross-country skiing. Thirteen elite female cross-country skiers performed single turns with a 9- or 12-m radius using the skidding technique and a 12- or ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/IJSPP.2013-0383
更新日期:2014-01-01 00:00:00
abstract::Player loads and fatigue responses are reported in 15 professional rugby league players (24.3 ± 3.8 y) during a period of intensified fixtures. Repeated measures of internal and external loads, perceived well-being, and jump flight time were recorded across 22 d, comprising 9 training sessions and matches on days 5, 1...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0390
更新日期:2017-09-01 00:00:00
abstract:PURPOSE:To identify the dose-response relationship between measures of training load (TL) and changes in aerobic fitness in academy rugby union players. METHOD:Training data from 10 academy rugby union players were collected during a 6-wk in-season period. Participants completed a lactate-threshold test that was used ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0121
更新日期:2018-02-01 00:00:00
abstract::Purpose: To analyse time domain, spectral and fractal properties of speed regulation during half-marathon racing. Methods: In twenty-one male experienced runners high-resolution data on speed (V), stride frequency (SF) and stride length (SL) were assessed during half-marathon competition (21098 m). Performance times, ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:
更新日期:2013-08-27 00:00:00
abstract::The National Basketball Association (NBA) has an extremely demanding competition schedule, requiring its athletes to compete in 82 regular-season games over a 6-mo period (∼3.4 games/wk). Despite the demanding schedule and high value of athletes, there is little public information on the specific game and training dem...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0384
更新日期:2019-04-01 00:00:00
abstract::The collection of retrospective lap times from video footage is a potentially useful research tool to analyze the pacing strategies in any number of competitive events. The aim of this study was to validate a novel method of obtaining running split-time data from publically available video footage. Videos of the 1500-...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.8.6.692
更新日期:2013-11-01 00:00:00
abstract:PURPOSE:To determine the effect of altitude training at 1600 and 1800 m on sea-level (SL) performance in national-level runners. METHODS:After 3 wk of SL training, 24 runners completed a 3-wk sojourn at 1600 m (ALT1600, n = 8), 1800 m (ALT1800, n = 9), or SL (CON, n = 7), followed by up to 11 wk of SL racing. Race per...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章,多中心研究
doi:10.1123/ijspp.2018-0104
更新日期:2019-03-01 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::The purpose was to develop and validate portable force-measurement devices for recording push and pull forces applied by each foot to the foot bar of a kayak and the horizontal force at the seat. A foot plate on a single-point force transducer mounted on the kayak foot bar underneath each foot allowed the push and pul...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2012-0333
更新日期:2014-03-01 00:00:00
abstract:PURPOSE:To quantify changes in skeletal-muscle oxygenation and pulmonary O2 uptake (V̇O2) after an extreme ultratrail running bout. METHODS:Before (PRE) and after (POST) the race (330-km, 24000 D±), profiles of vastus lateralis muscle oxygenation (ie, oxyhemoglobin [O2Hb], deoxyhemoglobin [HHb], and tissue oxygenation...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0745
更新日期:2017-04-01 00:00:00
abstract::Purpose: The hyperbolic distance-time relationship can be used to profile running performance and establish critical speed (CS) and D' (the curvature constant of the speed-time relationship). Typically, to establish these parameters, multiple (3+) performance trials are required, which can be highly fatiguing and limi...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0809
更新日期:2019-05-01 00:00:00
abstract:PURPOSE:While a number of studies have investigated gross efficiency (GE) in laboratory conditions, few studies have analyzed it in field conditions. Therefore, the aim of this study was to analyze the effect of gradient and cadence on GE in field conditions. METHODS:Thirteen trained cyclists (mean ± SD age 23.3 ± 4.1...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0373
更新日期:2015-10-01 00:00:00
abstract:PURPOSE:To determine the relationship between distance covered and player load (PL: sum of accelerations in all 3 planes of movement) in hockey training and competition. METHODS:Elite male hockey players (N=24) wore player-tracking devices in 7 international matches and 7 training sessions. Players were arranged in 4 ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0233
更新日期:2015-05-01 00:00:00
abstract:PURPOSE:To compare psychophysiological responses to 6 repeated-sprint sessions in normobaric hypoxia (RSH) and normoxia (RSN) in team-sport athletes during a 2-wk "live high-train low" training camp. METHODS:While residing under normobaric hypoxia (≥14 h/d, FiO2 14.5-14.2%), 23 lowland elite field hockey players perfo...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0052
更新日期:2017-01-01 00:00:00
abstract:PURPOSE:To observe voluntary fluid and carbohydrate intakes and thermoregulatory characteristics of road cyclists during 2 multiday, multiple-stage races in temperate conditions. METHODS:Ten internationally competitive male cyclists competed in 2 stage races (2009 Tour of Gippsland, T1, n = 5; 2010 Tour of Geelong, T2...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2012-0369
更新日期:2014-05-01 00:00:00
abstract:PURPOSE:To identify contributing factors to the incidence of illness for professional team-sport athletes, using training load (TL), self-reported illness, and well-being data. METHODS:Thirty-two professional rugby league players (26.0 ± 4.8 y, 99.1 ± 9.6 kg, 1.84 ± 0.06 m) were recruited from the same club. Players p...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0330
更新日期:2016-05-01 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::Investigations into ventilatory, metabolic, and hematological changes with altitude training have been completed; however, there is a lack of research exploring potential gait-kinematic changes after altitude training, despite a common complaint of athletes being a lack of leg "turnover" on return from altitude traini...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0056
更新日期:2017-01-01 00:00:00
abstract:PURPOSE:The purpose of this investigation was to quantify maximal aerobic power (VO2max) in soccer as a function of performance level, position, age, and time of season. In addition, the authors examined the evolution of VO2max among professional players over a 23-y period. METHODS:1545 male soccer players (22 ± 4 y, ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.8.3.323
更新日期:2013-05-01 00:00:00
abstract::The aim of the current study was to analyze the temporal effects that unsportsmanlike fouls may have on basketball teams' scoring performance under consideration of context-related variables. The authors analyzed 130 unsportsmanlike fouls from 362 elite basketball games (men's and women's Olympic Games, European and W...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0478
更新日期:2016-07-01 00:00:00
abstract:PURPOSE:Despite indications of positive effects of sauna (SAU) interventions, effects on performance recovery are unknown. The aim of the current study was to investigate acute effects of SAU bathing after an intensive training session on recovery of swim performance. METHODS:In total, 20 competitive swimmers and tria...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0333
更新日期:2019-12-22 00:00:00
abstract:PURPOSE:Elite endurance athletes may train in a polarized fashion, such that their training-intensity distribution preserves autonomic balance. However, field data supporting this are limited. METHODS:The authors examined the relationship between heart-rate variability and training-intensity distribution in 9 elite ro...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2013-0497
更新日期:2014-11-01 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::Hemoglobin mass (tHb) is considered to be a main factor for sea-level performance after "live high-train low" (LHTL) altitude training, but little research has focused on the persistence of tHb following cessation of altitude exposure. The aim of the case study was to investigate short-term effects of various hematolo...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.7.1.79
更新日期:2012-03-01 00:00:00
abstract:PURPOSE:To examine the validity of 2 kinematic systems for assessing mean velocity (MV), peak velocity (PV), mean force (MF), peak force (PF), mean power (MP), and peak power (PP) during the full-depth free-weight back squat performed with maximal concentric effort. METHODS:Ten strength-trained men (26.1 ± 3.0 y, 1.81...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0627
更新日期:2017-10-01 00:00:00