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 cyclists'performance in time-to-exhaustion tests. In addition, the effects of LLLT on the frequency content of the EMG signals to assess fatigue mechanisms were examined. Twenty male competitive cyclists participated in a crossover, randomized, double-blind, placebo-controlled trial. They performed an incremental cycling test to exhaustion (on day 1) followed by 4 time-to-exhaustion tests (on days 2-5) at their individual maximal power output. Before each time-to-exhaustion test, different dosages of LLLT (135, 270, and 405 J/thigh, respectively) or placebo were applied at the quadriceps muscle bilaterally. Power output and muscle activation from both lower limbs were recorded throughout the tests. Increased performance in time-to-exhaustion tests was observed with the LLLT-135 J (∼22 s; P < .01), LLLT-270 J (∼13 s; P = .03), and LLLT-405 J (∼13 s; P = .02) compared to placebo (149 ± 23 s). Although LLLT-270 J and LLLT-405 J did not show significant differences in muscle activation compared with placebo, LLLT-135 J led to an increased high-frequency content compared with placebo in both limbs at the end of the exhaustion test (P ≤ .03). In conclusion, LLLT increased time to exhaustion in competitive cyclists, suggesting this intervention as a possible nonpharmacological ergogenic agent in cycling. Among the different dosages, LLLT-135 J seems to promote the best effects.
journal_name
Int J Sports Physiol Performauthors
Lanferdini FJ,Bini RR,Baroni BM,Klein KD,Carpes FP,Vaz MAdoi
10.1123/ijspp.2016-0187subject
Has Abstractpub_date
2018-01-01 00:00:00pages
14-22issue
1eissn
1555-0265issn
1555-0273journal_volume
13pub_type
杂志文章,随机对照试验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::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: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:Recommendations state that to acquire the greatest benefit from heat-acclimation, the clock time of heat-acclimation sessions should match that of expected exercise-heat stress. It remains unknown if adaptations by postexercise hot-water immersion (HWI) demonstrate time-of-day-dependent adaptations. Thus, the a...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0620
更新日期:2018-11-19 00:00:00
abstract:PURPOSE:To examine the effect of caffeine supplementation on dribbling speed in elite female and male basketball players. METHODS:A double-blind, counterbalanced, randomized, crossover design was utilized. Elite basketball players (n = 21; female, n = 10; male, n = 11; age = 18.3 ± 3.3 yr) completed placebo (3 mg·kg-1...
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.2018-0871
更新日期:2019-07-01 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: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::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: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: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:Despite the volume of available literature focusing on marathon running and the prediction of performance, no single prediction equations exists that is accurate for all runners of varying experiences and abilities. Indeed the relative merits and utility of the existing equations remain unclear. Thus, the aim o...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0360
更新日期:2019-10-01 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 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 determine prevalence of heel strike in a midsize city marathon, if there is an association between foot-strike classification and race performance, and if there is an association between foot-strike classification and gender. METHODS:Foot-strike classification (forefoot, midfoot, heel, or split strike), gen...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.8.3.286
更新日期:2013-05-01 00:00:00
abstract:BACKGROUND:Sprint running acceleration is a key feature of physical performance in team sports, and recent literature shows that the ability to generate large magnitudes of horizontal ground-reaction force and mechanical effectiveness of force application are paramount. The authors tested the hypothesis that very-heavy...
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.2016-0444
更新日期:2017-07-01 00:00:00
abstract:PURPOSE:To determine how a cooling vest worn during a warm-up could influence selected performance (countermovement jump [CMJ]), physical (global positioning system [GPS] metrics), and psychophysiological (body temperature and perceptual) variables. METHODS:In a randomized, crossover design, 12 elite male World Rugby ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0821
更新日期:2019-07-30 00:00:00
abstract:PURPOSE:Endurance running performance is a multifactorial phenotype that is strongly associated with running economy. Sit and reach range of motion (SR ROM) is negatively associated with running economy, suggesting that reduced SR ROM is advantageous for endurance running performance. The COL5A1 gene has been associate...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.6.4.485
更新日期:2011-12-01 00:00:00
abstract:PURPOSE:This study examined the effects of Ramadan on cycling repeated-sprint ability (RSA) and corresponding diurnal variations. METHODS:Twelve active men performed an RSA test (5 × 6-s maximal sprints interspersed with 24 s passive recovery) during morning and afternoon sessions 1 wk before Ramadan (BR), during the ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.8.3.254
更新日期:2013-05-01 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 assess the measures of salivary free testosterone and cortisol concentrations across selected rugby union matches according to game outcome. METHODS:Twenty-two professional male rugby union players were studied across 6 games (3 wins and 3 losses). Hormone samples were taken 40 min before the game and 15 mi...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2013-0106
更新日期:2014-03-01 00:00:00
abstract::Force-time characteristics obtained during isometric strength tests are significantly correlated to various sporting movements. However, data on the relationship between isometric force-time characteristics and sprint kayaking performance are lacking in the literature. PURPOSE:The purpose of the study was, therefore,...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0607
更新日期:2020-09-12 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: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 Feder...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2012-0172
更新日期:2014-01-01 00:00:00
abstract::Purpose: To establish levels of association between physical fitness and match activity profiles of players in the Australian Football League (AFL) participation pathway. Methods: Players (N = 287, range 10.9-19.1 y) were assessed on 20-m sprint, AFL agility, vertical jump and running vertical jump, 20-m multistage fi...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2018-0488
更新日期:2019-07-01 00:00:00
abstract:PURPOSE:Prior research has illustrated that high volumes of aerobic exercise result in a reduction in basal concentrations of testosterone in men. Those studies were mostly conducted on recreational runners and identified reduced testosterone, but not concentrations low enough to be considered pathological. Therefore, ...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2017-0476
更新日期:2019-02-01 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::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:This study examined the influence of 10 days of intensified training on salivary cortisol and testosterone responses to 30-min, high-intensity cycling (55/80) in a group of male elite triathletes. METHODS:Seven elite male triathletes (age 19 ± 1 y, VO2max 67.6 ± 4.5 mL · kg-1 · min-1) completed the study. Swim...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2014-0360
更新日期:2015-10-01 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 genetic influence on the attainment of elite athlete status is well established, with a number of polymorphisms found to be more common in elite athletes than in the general population. As such, there is considerable interest in understanding whether this information can be utilized to identify future elite...
journal_title:International journal of sports physiology and performance
pub_type: 杂志文章
doi:10.1123/ijspp.2019-0543
更新日期:2020-12-03 00:00:00