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 15-m radius with step turning. Mechanical parameters were monitored using a real-time kinematic Global Navigation Satellite System and video analysis. Step turning was more effective during all phases of a turn, leading to higher velocities than skidding (P < .05). With both techniques, a greater radius was associated with higher velocity (P < .05), but the quality of turning, as assessed on the basis of energy characteristics, was the same. More effective skidding turns involved more pronounced deceleration early in the turn and maintenance of higher velocity thereafter, while more effective step turning involved lower energy dissipation during the latter half of the turn. In conclusion, the single-turn analysis employed here reveals differences in the various techniques chosen by elite cross-country skiers when executing downhill turns of varying radii and can be used to assess the quality of such turns.
journal_name
Int J Sports Physiol Performauthors
Sandbakk O,Bucher Sandbakk S,Supej M,Holmberg HCdoi
10.1123/IJSPP.2013-0383subject
Has Abstractpub_date
2014-01-01 00:00:00pages
41-7issue
1eissn
1555-0265issn
1555-0273journal_volume
9pub_type
杂志文章abstract::Repeated-sprint ability (RSA) is now well accepted as an important fitness component in team-sport performance. It is broadly described as the ability to perform repeated short (~3-4 s, 20-30 m) sprints with only brief (~10-30 s) recovery between bouts. Over the past 25 y a plethora of RSA tests have been trialed and ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.7.3.285
更新日期:2012-09-01 00:00:00
abstract:PURPOSE:To determine the reliability of the 505 change-of-direction (COD) test performed with both a stationary and a flying start. METHODS:Fifty-two female netball players (age 23.9 ± 5.4 y, height 169.9 ± 3.3 cm, body mass 65.2 ± 4.6 kg) performed 6 trials of the 505 COD test, 3 with a flying start and 3 with a stat...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0215
更新日期:2016-04-01 00:00:00
abstract:PURPOSE:Self-myofascial release (SMR) is a common exercise and therapeutic modality shown to induce acute improvements in joint range of motion (ROM) and recovery; however, no long-term studies have been conducted. Static stretching (SS) is the most common method used to increase joint ROM and decrease muscle stiffness...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0399
更新日期:2016-07-01 00:00:00
abstract:CONTEXT:Repeat-high-intensity efforts (RHIEs) have recently been shown to occur at critical periods of rugby league matches. PURPOSE:To examine the effect that caffeine has on RHIE performance in rugby league players. METHODS:Using a double-blind, placebo-controlled, crossover design, 11 semiprofessional rugby league...
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.2015-0689
更新日期:2017-02-01 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:PURPOSE:The purpose of this investigation was to determine the effect of stable and unstable conditions on one repetition maximum strength and muscle activity during dynamic squatting using absolute and relative loading. METHODS:Ten recreationally weight-trained males participated in this study (age = 24.1 +/- 2.0 y, ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.5.2.177
更新日期:2010-06-01 00:00:00
abstract:PURPOSE:To provide 2 general equations to estimate the maximum possible number of repetitions (XRM) from the mean velocity (MV) of the barbell and the MV associated with a given number of repetitions in reserve, as well as to determine the between-sessions reliability of the MV associated with each XRM. METHODS:After ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0302
更新日期:2018-03-01 00:00:00
abstract:UNLABELLED:Regular monitoring of adaptation to training is important for optimizing training load and recovery, which is the main factor in successful training. PURPOSE:To investigate the usefulness of a novel submaximal running test (SRT) in field conditions in predicting and tracking changes of endurance performance...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0366
更新日期:2016-04-01 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 examine variations in physical, physiological, and performance parameters over an annual training cycle in a world champion rowing crew. METHODS:Four world-class rowers, all of them members of the men's heavyweight quadruple sculls squad who are current world rowing champions, were assessed 3 times at regul...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.7.2.189
更新日期:2012-06-01 00:00:00
abstract:PURPOSE:Enhanced external counterpulsation (EECP) is a recovery strategy whose use has increased in recent years owing to the benefits observed in the clinical setting in some cardiovascular diseases (ie, improvement of cardiovascular function). However, its claimed effectiveness for the enhancement of exercise recover...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0792
更新日期:2018-09-01 00:00:00
abstract:PURPOSE:The session rating of perceived exertion (RPE) is a practical and noninvasive method that allows a quantification of the internal training load (TL) in individual and team sports, but no study has investigated its construct validity in martial arts. Therefore, the purpose of this study was to examine the conver...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.6.2.252
更新日期:2011-06-01 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:PURPOSE:To investigate the effects of combined sleep hygiene recommendations and mindfulness on actigraphy-based sleep parameters, perceptual well-being, anxiety, and match outcomes during high-performance junior tennis tournaments. METHODS:In a randomized crossover design, 17 high-performance junior tennis players co...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-1008
更新日期:2020-08-10 00:00:00
abstract:BACKGROUND:Pacing studies suggest the distribution of effort for optimizing performance. Cross-sectional studies of 1-mile world records (WRs) suggest that WR progression includes a smaller coefficient of variation of velocity. PURPOSE:This study evaluates whether intraindividual pacing used by elite runners to break ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0261
更新日期:2019-10-15 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 validity of the Velocomp PowerPod power meter in comparison with the Verve Cycling InfoCrank power meter. METHODS:This research involved 2 separate studies. In study 1, 12 recreational male road cyclists completed 7 maximal cycling efforts of a known duration (2 times 5 s and 15, 30, 60, 240, ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0790
更新日期:2019-10-02 00:00:00
abstract:PURPOSE:To assess and compare the effects of 8 wk of in-season (2 sessions/wk) low- and high-volume plyometric training (PT) on measures of physical fitness in prepubertal male soccer players. METHODS:A total of 25 soccer players were randomly assigned to a low-volume PT group (LPT; n = 13, age 12.68 ± 0.23 y, age at ...
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.2016-0372
更新日期:2017-10-01 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:PURPOSE:Critical speed (CS) and supra-CS distance capacity (D') are useful metrics for monitoring changes in swimmers' physiological and performance capacities. However, the utility of these metrics across a season has not been systematically evaluated in high level swimmers. METHODS:Twenty-seven swimmers (18 female; ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0745
更新日期:2019-07-01 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 compare the effects of unilateral and bilateral resistance training on single-leg power output, between-limbs imbalance (BLI), bilateral deficit (BLD), change of direction (COD), and linear sprinting and jumping performance in young elite basketball players. METHODS:Twenty-two young (U-16-U-19) male basketb...
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.2015-0743
更新日期:2017-01-01 00:00:00
abstract:PURPOSE:To compare the effects of 2 repeated-sprint training programs on fitness in soccer. METHODS:Fifteen semiprofessional soccer players (age: 24 ± 4 y; body mass: 77 ± 8 kg) completed 6 repeated-sprint training sessions over a 2-week period. Players were assigned to a straight-line (STR) (n = 8; 3-4 sets of 7 × 30...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0608
更新日期:2016-11-01 00:00:00
abstract:CONTEXT:Track-cycling team pursuit (TP) is a highly technical effort involving 4 athletes completing 4 km from a standing start, often in less than 240 s. Transitions between athletes leading the team are obviously of utmost importance. PURPOSE:To perform qualitative video analyses of transitions of world-class athlet...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0596
更新日期:2017-11-01 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:To examine the validity and reliability of a novel futsal special performance test (FSPT) as a measure of futsal performance and skills. METHODS:Thirty-six futsal players with different levels of experience were recruited and divided into 2 groups (elite and nonelite). Players participated in 4 sessions (at le...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0850
更新日期:2019-09-01 00:00:00
abstract::The maximal lactate steady state (MLSS) depicts the highest blood lactate concentration (BLC) that can be maintained over time without a continual accumulation at constant prolonged workload. In cycling, no difference in the MLSS was combined with lower power output related to peak workload (IMLSS) at 100 than at 50 r...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0573
更新日期:2017-03-01 00:00:00
abstract::The aim of this study was to compare 2 different methodological assessments when analyzing the relationship between performance and heart-rate (HR) -derived indices (resting HR [RHR] and HR variability [HRV]) to evaluate positive adaptation to training. The relative change in estimated maximum aerobic speed (MAS) and ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.8.6.688
更新日期:2013-11-01 00:00:00
abstract::Endurance exercise performance in hypoxia may be influenced by an ability to maintain high minute ventilation (V˙E) in defense of reduced arterial oxyhemoglobin saturation. Inspiratory muscle training (IMT) has been used as an effective intervention to attenuate the negative physiological consequences associated with ...
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.2018-0483
更新日期:2019-09-01 00:00:00
abstract::Apollo 13 was initially looking like it would be the smoothest flight ever. After the explosion of an oxygen tank, however, the astronauts were close to spending the rest of their lives in rotation around the planet. This well-known incident is used to further discuss the link, or lack thereof, between sport-science r...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0422
更新日期:2017-09-01 00:00:00