International journal of sports physiology and performance Impact Factor & Information

Publisher: Human Kinetics (Organization), Human Kinetics

Journal description

Current impact factor: 2.68

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 2.683
2012 Impact Factor 2.247
2011 Impact Factor 1.796

Impact factor over time

Impact factor
Year

Additional details

5-year impact 2.31
Cited half-life 3.80
Immediacy index 0.11
Eigenfactor 0.00
Article influence 0.63
Website International Journal of Sports Physiology and Performance website
Other titles International journal of sports physiology and performance, IJSPP
ISSN 1555-0265
OCLC 58426616
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

Human Kinetics

  • Pre-print
    • Archiving status unclear
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Author's post-print only (in PDF or other image capture format)
    • On the author's personal website(s) or institutional repository
    • Publisher's version/PDF cannot be used
    • Publisher copyright and source must be acknowledged
    • Must link to publisher version
    • Set statement to accompany deposit "as accepted for publication"
    • Publisher last contacted on 05/12/2013
  • Classification
    ​ blue

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this study was to examine the seasonal changes in body composition, nutrition, and upper body strength in professional Australian Football (AF) players. A prospective longitudinal study examined changes in anthropometry (body mass, fat-free soft tissue mass (FFSTM) and fat mass (FM)) via dual-energy X-ray absorptiometry (DXA) five times during an AF season (start-preseason, mid-preseason, start-inseason, mid-inseason, end-inseason) in 45 professional AF players. Dietary intakes and strength (bench press and bench pull) were also assessed at these time points. Players were categorised as experienced (>4 y experience, N=23) or inexperienced (<4 y experience, N=22). FM decreased during the preseason but was stable through the inseason for both groups. %FFSTM was increased during the preseason and remained constant thereafter. Upper body strength increased during the preseason and was maintained during the inseason. Changes in upper body FFSTM were related to changes in UB strength performance (r = 0.37-0.40). Total energy and carbohydrate intakes were similar between the experienced and inexperienced players during the season, but there was a greater ratio of dietary fat intake at the start-preseason point, and an increased alcohol, reduced protein and increased total energy intake at the end of the season. The inexperienced players consumed more fat at the start of season and less total protein during the season compared to the experienced players. Coaches should also be aware that it can take >1 y to develop the appropriate levels of FFSTM in young players and take a long-term view when developing the physical and performance abilities of inexperienced players.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2014-0447
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    ABSTRACT: High levels of lean mass are important for collision-based sports, for the development of strength and power, which may also assist during contact situations. Whilst skinfold-based measures have been shown to be appropriate for cross-sectional assessments of body composition, their utility in tracking changes in lean mass is less clear. To determine the most effective method of quantifying changes in lean mass amongst rugby league athletes. Twenty-one professional rugby league players undertook body composition assessments on 2-3 occasions separated by ≥6 weeks, including bioelectrical impedance analysis (BIA), the lean mass index (LMI) and a skinfold-based prediction equation (SkF). Dual x-ray absorptiometry (DXA) provided a criterion measure of fat-free mass (FFM). Correlation coefficients (r) and standard errors of the estimate (SEE) were used as measures of validity for the estimates. All three practical estimates exhibited strong validity for cross-sectional assessments of FFM (r > 0.9, p < 0.001). The correlation between change scores was stronger for the LMI (r = 0.69, SEE 1.3 kg) and the SkF method (r = 0.66, SEE = 1.4 kg) compared to BIA (r = 0.50, SEE = 1.6 kg). The LMI is probably accurate in predicting changes in FFM as a skinfold-based prediction equation, and very likely to be more appropriate than the BIA method. The LMI offers an adequate, practical alternative for assessing in FFM amongst rugby league athletes.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0244
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    ABSTRACT: To examine pacing strategies of ultra-cyclists competing in the 'Race Across AMerica' (RAAM), the world's longest ultra-cycling race covering ~4,860 km from the west to the east coast of America. Age, cycling speed at and across time stations, race distance, relative difference in altitude between time stations, wind velocity, wind gradient and temperature at each time station were recorded for women and men competing from 2010 to 2014. Changes in cycling speed and power output of elite and age group finishers were analysed using mixed-effects regression analyses. Cycling speed decreased across time stations for women and men where men were faster than women. Power output decreased across time stations in women and men and was lower for women for all finishers, the annual three fastest and age group 60-69 years, but not for age groups 18-49 and 50-59 years. The change in temperature and altitude had an influence on cycling speed and power output in all finishers, the annual top three, non-finishers, in all different age groups for both women and men, only in the age group 50-59 years altitude had no influence on cycling speed. Positive pacing (i.e. decrease in speed throughout the race) seemed to be the adequate strategy in the RAAM. The top three finishers started faster and had a higher power output at the start compared to less successful competitors, achieved the highest peak cycling speeds and power output and maintained peak cycling speed and power output longer before slowing down.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0051
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    ABSTRACT: The purpose of this study was to analyze the effects of a low-load, high-velocity resistance training (RT) combined with plyometrics on physical performance in pre-peak height velocity (PHV) soccer players. Thirty young soccer players from the same academy were randomly assigned to either a strength training (STG, n = 15) or a control group (CG, n = 15). Strength training consisted of full squat exercise with low-load (45-58% 1RM) and low-volume (4-8 repetitions per set) combined with jumps and sprints twice a week over 6 weeks of preseason. The effect of the training protocol was assessed using sprint performance over 10 and 20 m (T10, T20, T10-20), countermovement jump (CMJ), estimated one-repetition maximum (1RMest) and average velocity attained against all loads common to pre- and post-tests (AV) in full squat. STG showed significant improvements (P = .004 - .001) and moderate to very large standardized effects (ES = 0.71 - 2.10) in all variables measured, whereas no significant gains were found in CG (ES = -0.29 to 0.06). Moreover, significant test × group interactions (P < .003 - .001) and greater between-groups ES (0.90 - 1.97) were found for all variables in favour of STG compared to CG. Only 6 weeks of preseason low-volume and low-loads RT combined with plyometrics can lead to relevant improvements in strength, jump and sprint performance. Thus, the combination of field soccer training and lightweight strength training could be used for a greater development of the tasks critical to soccer performance in pre-PHV soccer players.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0176
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    ABSTRACT: Skeletal muscle function can be evaluated using force-times curves generated via the isometric mid-thigh pull (IMTP). Various sampling frequencies (500-1000 Hz) have been used for IMTP assessments; however no research has investigated the influence of sampling frequency on IMTP kinetics. Therefore, the purpose of this study was to investigate the influence of sampling frequency on kinetic variables during the IMTP; including peak force, time-specific force values (100, 150 and 200 ms) and rate of force development (RFD) at time bands (0-100, 0-150, 0-200 ms). Academy rugby league players (n = 30, age: 17.5 ± 1.1 years; height: 1.80 ± 0.06 m; mass: 85.4 ± 10.3 kg) performed three IMTP trials on a force platform sampling at 2000 Hz, which was subsequently down sampled to 1500, 1000 and 500 Hz for analysis. Intra-class correlation coefficients (ICC) and coefficient of variation (CV) demonstrated high within-session reliability for all force and RFD variables across all sampling frequencies (ICC ≥0.80; CV ≤10.1%). Repeated measures analysis of variance revealed no significant differences (P>0.05, Cohen's d ≤0.009) in kinetic variables between sampling frequencies. Overall, high reliability was observed across all sampling frequencies for all kinetic variables with no significant differences (P>0.05) for each kinetic variable across sampling frequencies. Practitioners and scientists may consider sampling as low as 500 Hz when measuring peak force, time specific force values and RFD at pre-determined time bands during the IMTP for accurate and reliable data.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0222
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    ABSTRACT: To A) evaluate the difference in performance of the 30-15 Intermittent Fitness Test (30-15IFT) across four squads in a professional rugby union club in the United Kingdom (UK), and B) consider body mass in the interpretation of the end velocity of the 30-15IFT (VIFT). One hundred and fourteen rugby union players completed the 30-15IFT mid- season. VIFT demonstrated small and possibly lower (ES = -0.33; 4/29/67) values in the Under 16s compared to the Under 21s, with further comparisons unclear. With body mass included as a covariate all differences were moderate to large, and very likely to almost certainly lower in the squads with lower body mass, with the exception of comparisons between Senior and Under 21 squads. The data demonstrate that there appears to be a ceiling to the VIFT attained in rugby union players which does not increase from Under 16s to Senior level. However, the associated increases in body mass with increased playing level suggest that the ability to perform high intensity running is increased with age, although not translated into greater VIFT due to the detrimental effect of body mass on change of direction. . Practitioners should be aware that VIFT is unlikely to improve, however it needs to be monitored during periods where increases in body mass are evident.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0231
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    ABSTRACT: With a view to informing in-game decision making as it relates to strategy and pitcher health, this study examined changes in pitching performance characteristics across nine innings of professional (MLB) baseball games. 129 starting MLB pitchers met the inclusion criteria for this study. Pitch type, speed, ball movement, release location, and strike zone data-collected using the MLB's ball tracking system, PITCHf/x-were obtained for 1,514,304 pitches thrown between 2008 and 2014. Compared with the first inning, the proportion of hard pitches thrown decreased significantly until the seventh inning, while the proportions of breaking and off-speed pitches increased. Significant decreases in pitch speed, increases in vertical movement, and decreases in release height emerged no later than inning five and the largest differences in all variables were generally recorded between the first inning and the late innings (seven to nine). Pitchers were most effective during the second inning and significantly worse in innings four and six. These data revealed that several aspects of a starting pitcher's pitching characteristics exhibited changes as early as the second or third inning of an MLB game, but this pattern did not reflect the changes in his effectiveness. Therefore, these alterations do not appear to provide reasonable justification for relieving a starting pitcher, although future work must address their relevance to injury. From an offensive standpoint, batters in the MLB should anticipate significantly more hard pitches during the early innings, but more breaking and off-speed pitches, with decreasing speed, as the game progresses.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0121
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    ABSTRACT: Although the amount of evidence demonstrating the beneficial effects of ischemic preconditioning (IPC) on exercise performance is increasing, conclusions about its efficacy cannot yet be drawn. Therefore, the purposes of this review were to determine the effect of IPC on exercise performance and identify the effects of different IPC procedures, exercise types, and subjects' characteristics on exercise performance. The analysis comprised 19 relevant studies from 2000-2015, 15 of which were included in the meta-analyses. Effect sizes (ES) were calculated as the standardized mean difference. Overall, IPC had a small beneficial effect on exercise performance (ES = 0.43; 90% confidence interval [CI], 0.28-0.51). The largest ES were found for aerobic (ES = 0.51; 90% CI, 0.35 - 0.67) and anaerobic (ES = 0.23; 90% CI, -0.12 - 0.58) exercise. In contrast, an unclear effect was observed in power and sprint performance (ES = 0.16; 90% CI, -0.20 - 0.52). In conclusion, IPC can effectively enhance aerobic and anaerobic exercise performance.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0204
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    ABSTRACT: Exercise is known to result in hemodynamic changes in the bi-lateral prefrontal cortex. The aim of this study was to investigate hemodynamic changes in right and left hemispheres of the prefrontal cortex (PFC) during incremental cycling exercise. Following ten minutes rest, nine participants (mean age 26.6 ± 2.5 years, mass 77.5 ± 9.7 kg and stature 1.79 ± 0.9 m) cycled at between 100 and 150 W for four minutes. Thereafter, resistance was increased by 25 W every four minutes until exhaustion. Respiratory exchange and concentrations of oxy- ([HbO2]), deoxy- ([(HHb]) and total haemoglobin ([Hbtot]) in the PFC were continuously measured. Data were averaged for 60-s at rest and preceding VT1, VT2 and volitional exhaustion (EXH) and after five minutes recovery (REC). Subjective ratings of affect were measured at VT1, VT2 and VT1 minus 25W (VT1-25W) and VT2 plus 25W (VT2+25W). There were no between hemisphere differences in [HbO2] or [Hbtot] at rest, VT1 or REC; or in [HHb] at any point. Right hemisphere [HbO2] and [Hbtot] were significantly greater than left at VT2 (p=0.01 and p=0.02) and EXH (p=0.03 and p=0.02). Affect was significantly greater at VT1-25W versus VT2 and VT2+25W; and at VT1 and VT2 compared to VT2+25W (p<0.01 to p<0.03). To our knowledge, this is the first study to describe an exercise state dependent change in PFC asymmetry during incremental exercise. The asymmetry detected coincided with a decrease in affect scores in agreement with the PFC asymmetry hypothesis.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0168
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    ABSTRACT: The aim of the present study was to examine in elite soccer players some psychometric and physiological responses to a competitive camp in the heat, after travelling across 6 time-zones. Data from 12 elite professional players (24.6±5.3 yr) were analyzed. They participated in an 8-day pre-season summer training camp in Asia (heat index 34.9±2.4 °C). Players' activity was collected during all training sessions and the friendly game using 15-Hz GPS. Perceived training/playing load was estimated using session rate of perceived exertion (RPE) and training/match duration. Psychometric measures of wellness were collected upon awakening before, during and after the camp using simple questionnaires. HR response to a submaximal 4-min run (12 km/h) and the ratio between velocity and force load (accelerometer-derived measure, a marker of neuromuscular efficiency) response to 4 ~60-m runs (22-24 km/h) were collected before, at the end and after the camp. After a large increase, the RPE/m.min-1 ratio decreased substantially throughout the camp. There were possible small increases in perceived fatigue and small decreases in subjective sleep quality on the 6th day. There were also likely moderate (~3%) decreases in HR response to the submaximal run, both at the end and after the camp, which were contemporary to possible small (~8%) and most-likely moderate (~19%) improvements in neuromuscular efficiency, respectively. Despite transient increases in fatigue and reduced subjective sleep quality by the end of the camp, these elite players showed clear signs of heat acclimatization, which were associated with improved cardiovascular fitness and neuromuscular running efficiency.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0135
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    ABSTRACT: This purpose of this study was to calculate the coefficients of variation in jump performance for individual participants in multiple trials over time to determine the extent that there are real differences in the error of measurement between participants. The effect of training phase on measurement error was also investigated. Six subjects participated in a resistance training intervention for 12 weeks with mean power from a countermovement jump measured 6d.wk-1. Using a mixed model meta-analysis, differences between subjects, within-subject changes between training phases, and the mean error values during different phases of training were examined. Small, substantial factor differences of 1.11 were observed between subjects, however the finding was unclear based on the width of the confidence limits. The mean error was clearly higher during overload training compared to baseline training, by a factor of ×/÷ 1.3 (confidence limits 1.0-1.6). The random factor representing the interaction between subjects and training phases revealed further substantial differences of ×/÷ 1.2 (1.1-1.3), indicating that on average, the error of measurement in some subjects changes more than others when overload training is introduced. The results from this study provide the first indication that within-subject variability in performance is substantially different between training phases, and possibly different between individuals. The implications of these finding for monitoring individuals and estimating sample size are discussed.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0115
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    ABSTRACT: Caffeine can be beneficial during endurance and repeated sprint exercise in able-bodied individuals performing leg or whole-body exercise. However, little evidence exists regarding its effects during upper-body exercise. This study therefore aimed to investigate the effects of caffeine on sprint and 4 min maximal push (PUSH) performance in wheelchair sportsmen. Using a double-blind, placebo-controlled, crossover design, 12 male wheelchair rugby players (age 30.0±7.7 y, body mass 69.6±15.3 kg, training hours 11.1±3.5 h/wk) completed two exercise trials, separated by 7-14 d, 70 min after ingestion of 4 mg·kg-1 caffeine (CAF) or dextrose placebo (PLA). Each trial consisted of four 4-min PUSH and three sets of 3x20 m sprints, each separated by 4 min rest. Participants responded to the Felt arousal (a measure of perceived arousal), Feeling (a measure of the affective dimension of pleasure-displeasure) and Rating of Perceived Exertion (RPE) scales. Salivary caffeine secretion rates were measured. Average sprint times were faster during CAF relative to PLA during SPR1 and SPR2 (p=0.037 and 0.016). There was no influence of supplementation on PUSH2-4 (p>0.099) however, participants pushed significantly further during PUSH1 following CAF relative to PLA (mean±SD, 677±107 and 653±118 m, p=0.047). There was no influence of caffeine on arousal or RPE scores (p>0.132). Feeling scores improved over the course of the caffeine trial only (p=0.017) but did not significantly differ between trials (p>0.167). Pre-warm-up (45 min post-ingestion) salivary caffeine secretion rates were 1.05±0.94 and 0.08±0.05 μg/min for CAF and PLA, respectively. Acute caffeine supplementation can improve both 20 m sprint performance and a one-off bout of short-term endurance performance in wheelchair sportsmen.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0073
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    ABSTRACT: The combined supplementation of caffeine and sodium bicarbonate may have a potential ergogenic effect during intermittent exercise tasks such as judo; however, its effect in this sport has not been tested. To investigate the isolated and combined effects of caffeine (CAF) and sodium bicarbonate (NaHCO3) on judo performance. Ten judokas performed four supplementation protocols (i) NaHCO3, (ii) CAF, (iii) NaHCO3 plus CAF and (iv) placebo (cellulose) followed by three Special Judo Fitness Tests (SJFT) interspaced with 5-min rest. In the first SJFT, the combined supplement (NaHCO3 + CAF) resulted in a higher number of throws compared to placebo (24.4 ± 0.9 and 23.2 ± 1.5 throws respectively, P = .02). There was no significant difference between conditions for the second SJFT (P = .11). In the third SJFT, NaHCO3 and NaHCO3 + CAF resulted in increased throws when compared to placebo (23.7 ± 1.6, 24.4 ± 1.0, and 22.0 ± 1.6 throws, P = .001 and P = .03, respectively). When the total throws performed in the three SJFT were summed, they were higher than placebo only for NaHCO3 + CAF (68.8 ± 4.4 and 72.7 ± 3.1 throws, respectively, P = .003). Post-exercise plasma lactate after each SJFT was higher in all experimental conditions compared to placebo (P = .001). There was no significant difference in RPE across the conditions (P = .18). The results of the current study show that the combined supplementation of caffeine and sodium bicarbonate increases judo performance when compared to placebo.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0020
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    ABSTRACT: We investigated a new power-to-body mass (BM) ratio 3 min-all out cycling test (3 MT%BM) for determining critical power (CP) and finite work capacity above CP (W'). The gas exchange threshold (GET), maximal oxygen uptake (VO2max) and power output evoking VO2max (Wpeak) and GET (WGET) for cycle ergometry were determined in 12 participants. CP and W' were determined using the original "linear factor" 3 MT (3 MTrpm^2) and compared with CP and W' derived from a procedure, the 3 MT%BM, using a person's BM and self-reported, physical activity rating (PA-R), with values derived from linear regression of the work-time (W-time model), and power-inverse time (1/time model) data from three separate, exhaustive square-wave bouts. The VO2max, VO2GET, Wpeak, and WGET values estimated from PA-R and a non-exercise regression equation did not differ (p > 0.05) from actual measurements. Estimates of CP derived from the 3 MT%BM (235 ± 56W) and the 3 MTrpm^2 (234 ± 62 W), work-time (231 ± 57 W) and 1/time models (230 ± 57 W) did not differ (F = 0.46, p = 0.72). Similarly, estimates of W' between all methods did not differ (F = 3.58, p = 0.07). There were strong comparisons of the 3 MT%BM to 1/time and work/time models with the average correlation, SEM and CV% for critical power being 0.96, 8.74 watts and 4.64%, respectively. The 3 MT%BM is a valid, single-visit protocol for determining CP and W'.
    International journal of sports physiology and performance 07/2015; DOI:10.1123/ijspp.2015-0116
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    ABSTRACT: No abstract available for this article.
    International journal of sports physiology and performance 07/2015; 10(5):541. DOI:10.1123/IJSPP.2015-0291
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    ABSTRACT: The principle aim of the study was to assess the acute alterations in tri-axial accelerometry (PlayerLoad™; PLVM) and its individual axial-planes (anterior-posterior-PlayerLoad™ [PLAP], medial-lateral-PlayerLoad™ [PLML] and vertical-PlayerLoadTM [PLV]) during a standardised 90-min soccer match-play simulation (SAFT90). Secondary aims of the study were to assess the test-retest reliability and anatomical location of the devices. Semi-professional (n=5) and University (n=15) soccer players completed 3 trials (1 familiarisation, 2 experimental) of SAFT90. PlayerLoad™ and its individual planes were measured continuously using micromechanical-electrical systems (MEMS) positioned at the scapulae (SCAP) and near the centre of mass (COM). There were no between-half differences in PLVM, however, within-half increases were recorded at the COM, but only during the 1st half at the SCAP. Greater contributions to PLVM were provided by PLV and PLML when derived from the SCAP and COM, respectively. PLVM (COM: 1451 ± 168; SCAP: 1029 ± 113), PLAP (COM: 503 ± 99; SCAP: 345 ± 61), PLML (COM: 712 ± 124; SCAP: 348 ± 61) and PLV (COM: 797 ± 184; SCAP: 688 ± 124) were significantly greater at the COM compared to the SCAP. Moderate and high test-retest reliability was observed for PlayerLoad™ and its individual planars at both locations (ICC: 0.80-0.99). PlayerLoad™ and its individual planes are reliable measures during SAFT90 and detected within-match changes in movement strategy when the unit was placed at the COM, which may have implications for fatigue management. Inferring alterations in lower-limb movement strategies from MEMS units positioned at the SCAP should be undertaken with caution.
    International journal of sports physiology and performance 06/2015; DOI:10.1123/ijspp.2014-0582