International journal of sports physiology and performance (Int J Sports Physiol Perform )

Publisher: Human Kinetics (Organization), Human Kinetics


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  • Website
    International Journal of Sports Physiology and Performance website
  • Other titles
    International journal of sports physiology and performance, IJSPP
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  • Material type
    Periodical, Internet resource
  • Document type
    Journal / Magazine / Newspaper, Internet Resource

Publisher details

Human Kinetics

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    • Author can archive a post-print version
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    • On the author's own web site(s) or other electronic repositories controlled by the author's institution
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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Purpose: The purpose of this study was to examine the concurrent and construct validity of the Borg (0-10) and children’s OMNI scales for quantifying the exercise intensity and training load (TL) in youth soccer players. Methods: Twelve children (mean ± SD; age, 11.4 ± 0.5 yr; height, 154.3 ± 6.5 cm and body mass, 39.5 ± 5.4 kg) took part in this study. Exercise intensity and TL were calculated on the basis of the session rating of perceived exertion (sRPE) and HR (Edwards’ method) during 20 technical-tactical training sessions. Players’ sRPE were obtained from the Borg and OMNI scales. Results: Low correlations between HR-based TL and sRPE TL based on the Borg (r = 0.17, P = 0.335) and OMNI (r = 0.34, P = 0.007) scales were obtained. Significant (P < 0.001) relationships in sRPE (r = 0.76) and TL (r = 0.79) between RPE scales were found. Conclusion: The present data do not support the relationship between the sRPE and HR methods for quantifying TL in youth soccer players. However, the sRPE method could be considered a better indicator of global internal TL, since sRPE is a measure of both physical and psychological stress. In addition, we have demonstrated the construct validity for OMNI scale to control exercise demands.
    International journal of sports physiology and performance 09/2014;
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    ABSTRACT: The aim of this study was to analyze the effects of a very congested match schedule on the total distance covered (TD), high-intensity running distance (HIR), and frequency of accelerations and body load impacts (BLI) performed in a team of Under-15 soccer players (n=10; 15.1±0.2 yr, 171.8±4.7 cm, 61±6.0 kg) during an international youth competition.
    International journal of sports physiology and performance 08/2014;
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    ABSTRACT: Static stretching with rest between repetitions is often performed to acutely increase joint flexibility. PURPOSE: To test 1) the effects of the lack of resting between stretching repetitions, and 2) the minimal number of stretching repetitions required to change the maximal range of motion (ROM), maximal tolerated joint passive torque (MPT), and submaximal passive torque at a given angle (PT). METHODS: Five static stretching repetitions with a 30-s rest interval (RI) and non-rest interval (NRI) stretching protocols were compared. Participants (n=47) were encouraged to perform the maximal ROM without pain in all the repetitions. Each repetition lasted 90 s. Maximal ROM, MPT, PT, and muscle activity were compared between protocols for the same number of stretching repetitions. RESULTS: The NRI produced a higher increase in maximal ROM and MPT during and after stretching (P<0.05). PT decreased in both protocols, although the NRI tended to have a lower decrement across different submaximal angles (0.05<P<0.08) in the initial range of the torque-angle curve. Significantly changes in maximal ROM (P<0.01) and PT (P<0.01) were obtained at the 3rd and 2nd repetition of RI, respectively. The RI did not significantly increase the MPT (P=0.12) after stretching, only the NRI did (P<0.01). CONCLUSIONS: Lack of rest between repetitions more efficiently increased the maximal ROM and capacity to tolerate passive torque during and after stretching. The use of 30-s rest between repetitions potentiates the decrease in passive torque. Rest intervals should not be used if the aim is to acutely increase the maximal ROM and peak passive torque.
    International journal of sports physiology and performance 07/2014;
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    ABSTRACT: The isometric mid-thigh pull (IMTP) has been used to monitor changes in force, maximum rate of force development (mRFD) and impulse, with performance in this task being associated with performance in athletic tasks. Numerous postures have been adopted within the literature, which may affect the kinetic variables during the task; therefore the aim of this investigation was to identify if different knee joint angles (120°, 130°, 140° and 150°), hip joint angles (125° and 145°), including the subjects preferred posture, affect force, mRFD and impulse during the IMTP. Intraclass correlation coefficients demonstrated high within-session reliability (r≥0.870, p<0.001) for all kinetic variables determined in all postures, excluding impulse measures during 130º knee flexion, 125° hip flexion posture, which showed a low to moderate reliability (r=0.666-0.739, p<0.001), while between session testing demonstrated a high reliability (r>0.819, p<0.001) for all kinetic variables. There were no significant differences in peak force (p>0.05; Cohen's d = 0.037; power = 0.408), mRFD (p>0.05; Cohen's d = 0.037; power = 0.409) or impulse at 100 ms (p>0.05; Cohen's d = 0.056; power = 0.609), 200 ms (p>0.05; Cohen's d = 0.057; power = 0.624), or 300 ms (p>0.05; Cohen's d = 0.061; power = 0.656), across postures. Smallest detectable differences demonstrated that changes in performance of >1.3% in peak isometric force, >10.3% in mRFD, >5.3% in impulse at 100 ms, >4.4% in impulse at 200 ms, and >7.1% in impulse at 300 ms, should be considered meaningful, irrespective of posture.
    International journal of sports physiology and performance 06/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: The individual pursuit is a 4km cycling time trial performed on a velodrome. Parathletes with transtibial amputation (TTA) have lost physiological systems but this may be offset by the reduced aerodynamic drag of the prosthesis. This research was performed to understand the effect of a uni-lateral transtibial amputation on Olympic 4km pursuit performance. A forward integration model of pursuit performance explored the interplay between power loss and aerodynamic gains in parathletes with TTA. The model is calibrated to a 4km pursuit time of 4:10.5 (Baseline) then adjusted to account for a TTA. Conditions simulated were based on typical pedal asymmetry in TTA (AMP), if foot stiffness was decreased (FLEX), if pedaling asymmetries were minimized (ASYM), if the prosthesis was aerodynamically optimized (AERO), if the prosthesis has a cosmetic cover (CC), and if all variables were optimized (OPT). A random Monte Carlo analysis was performed to understand model precision. 4km pursuit performances predicted by the model were 4:10.5, 4:20.4, 4:27.7, 4:09.2, 4:19.4, 4:27.9, 4:08.2 for the Baseline, AMP, FLEX, ASYM, AERO, CC, and OPT models, respectfully. Model precision was ±3.7 seconds. While the modeled time decreased for ASYM and OPT modeled conditions, the time reduction fell within model precision and therefore not significant. Practical application of these results suggest parathletes with a TTA could improve performance by minimizing pedaling asymmetry and/or optimizing aerodynamic design but, at best, they will similar performance to intact cyclists. In conclusion, parathletes with TTA do not have a net advantage in the individual pursuit.
    International journal of sports physiology and performance 05/2014;
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    ABSTRACT: The present study examined the acute effect of a single static stretching session of hamstring muscles on the torque production in relation with the individual flexibility. Maximal voluntary concentric torque of hamstring muscles was measured before and after a static stretching session (6 × 30 s). Torque changes were correlated with the flexibility level determined at the onset of the experimental procedure. The hamstring stretching intervention significantly reduced maximal concentric torque in participants with low and high hamstring flexibility. Hamstring flexibility and torque decrease, determined immediately after the stretching procedure, were negatively correlated. Torque decrease measured after the static stretching session is dependent on participant's flexibility. Participants with low flexibility are much more susceptible to demonstrate large torque decreases post-stretching.
    International journal of sports physiology and performance 05/2014;
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    ABSTRACT: The purpose of the present study was to provide a descriptive and quantitative time-motion analysis of surfing training, with the use of global positioning system (GPS) and heart rate (HR) technology. Fifteen male surfing athletes (22.1 ± 3.9 yr; 175.4 ± 6.4 cm; 72.5 ± 7.7 kg) performed a two hour surfing training session, wearing both a GPS unit and HR monitor. An individual digital video recording was taken of the entire surfing duration. Repeat measures ANOVA were used to determine any effects of time on the physical and physiological measures. Participants covered 6293.2 ± 1826.1 m during the two hour surfing training session, and recorded measures of average speed, HRaverage and HRpeak as: 52.4 ± 15.2 m·min-1, 128 ± 13 b·min-1 and 171 ± 12 b·min-1, respectively. Further, the relative mean time spent performing; paddling, sprint paddling to catch waves, stationary, wave riding, and recovery of the surfboard was: 42.6 ± 9.9 %, 4.1 ± 1.2 %, 52.8 ± 12.4 %, 2.5 ± 1.9 %, and 2.1 ± 1.7 %, respectively. The results demonstrate that a two hour surfing training session is performed at a reduced intensity compared to competitive heats. This is likely due to the onset of fatigue and a pacing strategy utilised by participants. Further, surfing training sessions do not appear to appropriately condition surfers for competitive events. As a result, coaches working with surfing athletes should consider altering training sessions to incorporate repeated effort sprint paddling to more effectivelyphysically prepare surfers for competitive events.
    International journal of sports physiology and performance 05/2014;
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    ABSTRACT: The aim of the present study was to quantify the physiological, psychometric and performance effects of a 2-week Christmas break in a professional Australian Football League (AFL) club. A series of physiological (e.g., heart rate (HR) response to a 5-min submaximal run and skinfolds thickness), psychometric (rate of perceived exertion (RPE) responses and wellness variables) and performance (running activity during standardized handball games, isometric mid-thigh pull (IMTP) peak force and counter movement jump (CMJ) measures were conducted in the weeks before and after the break. There was a possible and small increase in the sum of the 7 skinfolds, whilst body mass and free fat mass remained possible and likely unchanged, respectively. Sleep and stress scores remained likely-to-almost certainly unchanged, but there were some small, possible-to-likely decreases in fatigue and soreness scores. HR and RPE responses to the 5-min submaximal run were likely slightly lower (i.e., improved) after the break. High-intensity running and acceleration distance during a standard handball game were very-likely slightly greater, while HR and RPE responses to the game were possibly-to-very likely unchanged. HR responses to a high-intensity training session remained very likely unchanged. There was also a likely small increase IMTP peak Force, but likely-to-very likely no change in CMJ variables. Our results show that players returned from a 2-week break during pre-season well recovered, with preserved to improved levels of strength and cardiorespiratory fitness, despite small increases in skinfold thickness.
    International journal of sports physiology and performance 05/2014;
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    ABSTRACT: No abstract available for this article.
    International journal of sports physiology and performance 05/2014; 9(3):377.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Purpose: To evaluate match performances of substitute players using different research designs. Methods: English Premier League matches were analyzed using a multiple-camera system. Two research designs were adopted: an independent-measures analysis comparing the match-performance characteristics of players completing the entire match (n = 810) vs substitutes (n = 286) and the players they replaced (n = 286) and a repeated-measures analysis comparing the same players completing full matches vs those in which they were introduced as a substitute (n = 94). Results: Most substitutions (P < .05) occurred at halftime and between the 60- to 85-min vs all first-half periods and the remaining second-half periods (effect size [ES]: 0.85-1.21). These substitutions become more (P < .01) offensive (eg, more attacking positions were introduced) in relation to the positions introduced as the half progressed (ES: 0.93-1.37). Independent-measures analysis indicated that high-intensity running was greater (P < .01) in substitutes compared with players who either completed the entire match or were replaced (ES: 0.28-0.67), but no differences were evident for pass-completion rates (ES: 0.01-0.02). Repeated-measures analysis highlighted that players covered more (P < .01) high-intensity running when they were introduced as substitutes compared with the equivalent period of the second- but not the first-half period (ES: 0.21-0.47). Both research designs indicated that attackers covered more (P < .05) high-intensity running than peers or their own performances when completing the entire match (ES: 0.45-0.71). Conclusions: Substitutes cover greater high-intensity-running distance; this was particularly evident in attackers, but pass-completion rates did not differ for any position. This information could be beneficial to coaches regarding optimizing the match running performances of their players, but much more work needs to be undertaken to investigate the overall impact of substitutes (physical, technical indicators, and contribution to key moments of matches).
    International journal of sports physiology and performance 05/2014; 9(3):415-24.

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