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, and 600 s). In study 2, 4 elite male road cyclists completed 13 outdoor cycling sessions. In both studies, power output of cyclists was continuously measured using both the PowerPod and InfoCrank power meters. Maximal mean power output was calculated for durations of 1, 5, 15, 30, 60, 240, and 600 seconds plus the average power output in study 2. RESULTS:Power output determined by the PowerPod was almost perfectly correlated with the InfoCrank (r > .996; P < .001) in both studies. Using a rolling resistance previously reported, power output was similar between power meters in study 1 (P = .989), but not in study 2 (P = .045). Rolling resistance estimated by the PowerPod was higher than what has been previously reported; this might have occurred because of errors in the subjective device setup. This overestimation of rolling resistance increased the power output readings. CONCLUSION:Accuracy of rolling resistance seems to be very important in determining power output using the PowerPod. When using a rolling resistance based on previous literature, the PowerPod showed high validity when compared with the InfoCrank in a controlled field test (study 1) but less so in a dynamic environment (study 2).
journal_name
Int J Sports Physiol Performauthors
Merkes PFJ,Menaspà P,Abbiss CRdoi
10.1123/ijspp.2018-0790subject
Has Abstractpub_date
2019-10-02 00:00:00pages
1-6eissn
1555-0265issn
1555-0273pii
ijspp.2018-0790pub_type
杂志文章abstract:PURPOSE:To investigate whether the combination of a soccer training session, plyometric training, and change-of-direction (COD) exercises would enhance soccer ability to a greater extent than training on its own in youth soccer players. METHODS:Thirty-one youth players participated in this study (age: 12 [0.8] y). Pla...
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.2018-0545
更新日期:2019-03-01 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:OBJECTIVES:To evaluate the current evidence regarding the quantification of cricket fast-bowling skill. METHODS:Studies that assessed fast-bowling skill (bowling speed and accuracy) were identified from searches in SPORTDiscus (EBSCO) in June 2017. The reference lists of identified papers were also examined for releva...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章,评审
doi:10.1123/ijspp.2017-0169
更新日期:2018-08-01 00:00:00
abstract:PURPOSE:To investigate the intersession reliability of selected kinematic and kinetic variables during countermovement vertical jumps (CMJs). METHODS:Thirty-five men and 35 women performed CMJs on a force platform during four testing sessions each separated by 1 wk. Kinematic variables included time in the air (TIA), ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.4.3.317
更新日期:2009-09-01 00:00:00
abstract:PURPOSE:The purpose of this study was to determine the relationship between various lactate-threshold (LT) definitions and the average running velocity during a 10-km and a 21.1-km time trial (TT). METHODS:Thirteen well-trained runners completed an incremental maximal exercise test, a 10-km TT, and a 21.1-km TT on a m...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.1.3.270
更新日期:2006-09-01 00:00:00
abstract:PURPOSE:The purpose of this study was to evaluate the effectiveness of repetitions to fatigue (RTF) using absolute and relative muscle-endurance performances to estimate 1-repetition-maximum (1-RM) bench-press performance in high school male athletes. METHODS:Members of high school athletic teams (n = 118, age = 16.5 ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2.3.305
更新日期:2007-09-01 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 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: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::The purpose of this study was to examine the effect that load has on the mechanics of the jump shrug. Fifteen track and field and club/intramural athletes (age 21.7 ± 1.3 y, height 180.9 ± 6.6 cm, body mass 84.7 ± 13.2 kg, 1-repetition-maximum (1RM) hang power clean 109.1 ± 17.2 kg) performed repetitions of the jump s...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0028
更新日期:2016-01-01 00:00:00
abstract:PURPOSE:To better understand the carbohydrate (CHO) requirement of Australian Football (AF) match play by quantifying muscle glycogen utilisation during an in-season AF match. METHODS:After a 24 h CHO loading protocol of 8 g/kg and 2 g/kg in the pre-match meal, two elite male forward players had biopsies sampled from ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0106
更新日期:2018-06-12 00:00:00
abstract:PURPOSE:The main objective of this study was to investigate the efficacy of both programmed (speed, agility, and quickness; SAQ) and random (small-sided games; SSG) conditioning methods on selected neuromuscular and physical performance variables. METHODS:Twenty volunteers (21.1 +/- 4.0 y, 1.71 +/- 0.09 m, 66.7 +/- 9....
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.4.4.494
更新日期:2009-12-01 00:00:00
abstract:PURPOSE:Games-based drills are the predominant form of training adopted during basketball practice. As such, researchers have begun to quantify the physical, physiological, and perceptual demands of different games-based drill formats. However, study methodology has not been systematically reported across studies, limi...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2020-0665
更新日期:2021-01-09 00:00:00
abstract:PURPOSE:To determine the influence the number of contact efforts during a single bout has on running intensity during game-based activities and assess relationships between physical qualities and distances covered in each game. METHODS:Eighteen semiprofessional rugby league players (age 23.6 ± 2.8 y) competed in 3 off...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0110
更新日期:2015-09-01 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: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::Intensive training periods may negatively influence immune function, but the immunological consequences of specific high-intensity-training (HIT) prescriptions are not well defined. PURPOSE:To explore whether 3 different HIT prescriptions influence multiple health-related biomarkers and whether biomarker responses to...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0527
更新日期:2019-11-21 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:To quantify the external training loads of positional groups in preseason training drills. METHODS:Thirty-three elite rugby league players were categorized into 1 of 4 positional groups: outside backs (n = 9), adjustables (n = 9), wide-running forwards (n = 9), and hit-up forwards (n = 6). Data for 8 preseason...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0789
更新日期:2017-07-01 00:00:00
abstract::The aim of the current study was to analyze men's and women's world records across the full range of running disciplines to contextualize the recent debate about the possibility of a sub-2-h marathon. The average male-female gap is currently 11.2% ± 1.0% for all running events. However, reducing the marathon time to b...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2016-0634
更新日期:2017-09-01 00:00:00
abstract:PURPOSE:To assess the effects of different modes of morning (AM) exercise on afternoon (PM) performance and salivary hormone responses in professional rugby union players. METHODS:On 4 occasions (randomized, crossover design), 15 professional rugby players provided AM (~8 AM) and PM (~2 PM) saliva samples before PM as...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2015-0508
更新日期:2016-09-01 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 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::Velocity strength training requires exercise modalities that allow athletes to reach very high movement velocity, which is limited during vertical movements involving body weight. PURPOSE:To quantify the mechanical outputs developed during horizontal squat jumps (HSJs), notably the movement velocity, in comparison wi...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0499
更新日期:2018-08-01 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::Evidence indicates that low-level laser therapy (LLLT) minimizes fatigue effects on muscle performance. However, the ideal LLLT dosage to improve athletes'performance during sports activities such as cycling is still unclear. Therefore, the goal of this study was to investigate the effects of different LLLT dosages on...
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.2016-0187
更新日期:2018-01-01 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: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:To assess the utility of a self-paced maximal oxygen uptake (VO2max) test (SPV) in eliciting an accurate measure of VO2max in comparison with a traditional graded exercise test (GXT) during motorized treadmill exercise. DESIGN:This was a cross-sectional experimental study whereby recreationally trained men (n ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0052
更新日期:2015-01-01 00:00:00