European journal of sport science最新文献

The purpose of this study was to investigate differences in ankle plantar flexion proprioception and lower extremity function between Achilles tendinopathy (AT) patients and healthy controls. 17 patients with midportion AT (age 22.0 ± 3.0, 7 females, and 10 males) and 17 healthy controls (age 21.5 ± 2.1, 7 females, and 10 males) were recruited. The following tests were performed randomly: the ankle plantar flexion active movement extent discrimination assessment (AMEDA), weight-bearing lunge test (WBLT), single leg hop test, figure-of-eight hop test, Y Balance Test (YBT), and lower extremity functional test (LEFT). Group comparisons were made between the AT and healthy groups, and receiver operator characteristic (ROC) curves were used to analyze the ability of tests to differentiate between participants with and without AT. Results showed that the AT group performed significantly worse in the ankle proprioception test (p = 0.016), single leg hop test (p = 0.001), figure-of-eight hop test (p < 0.001), unilateral LEFT (p = 0.001), and LEFT injury risk score (p = 0.001) than healthy controls. No significant between group difference was found in WBLT and YBT. Diagnostic analysis showed that the AMEDA (p = 0.018), single leg hop test (p = 0.003), figure-of-eight hop test (p = 0.002), and LEFT (p = 0.001) could differentiate between patients with AT and the healthy individuals. The current study demonstrated that ankle proprioception and functional performance involving explosive jump are impaired in patients with AT, suggesting poorer dynamic neuromuscular function and a higher risk of lower limb injury in this population, and furthermore, these tests should be considered in the assessment for AT.

British Army basic training (BT) and initial trade training (ITT) enable personnel to develop role-related physical capability to perform in-service job-roles. The study aimed to compare physical performance of trainees (completing ITT) and trained soldiers, on a series of gym-based fitness tests and representative military tasks. A total of 316 British Army personnel [68 trainees (63 men: 22 ± 3 years, 71.6 ± 8.4 kg and 1.74 ± 0.07 m) and 248 trained soldiers (225 men: 27 ± 6 years, 78.7 ± 12.7 kg and 1.76 ± 0.08 m)] completed two sessions. Session 1; body mass, stature, age and gym-based tests (2 km run, broad jump, seated medicine ball throw, hex bar deadlift, 100 m shuttle sprints, pull-ups and mid-thigh pull). Session 2; representative military tasks (loaded carriage [stage 1, 4 km, 35–40 kg and 4.8 km h⁻¹ fixed pace and stage 2, 2 km, 20–25 kg and individual best-effort speed], tactical movement, casualty drag, stretcher carry, vertical lift, repeated carry and incremental lift). Independent sample t-tests were employed to examine group differences. Compared to trainees, trained soldiers were older (p < 0.001), heavier (p < 0.001) and scored higher on broad jump (p = 0.024), medicine ball throw (p = 0.007) and mid-thigh pull (p = 0.048), but were slower on 2 km run (p = 0.047), loaded carriage (p < 0.019), tactical movement (p < 0.001) and casualty drag (p < 0.001). Overall, trainees achieve higher scores on aerobic/anaerobic tests, whereas trained soldiers outperform trainees in strength/power-based tests. Although a cross-sectional comparison does not provide strong evidence, the results may indicate that cardiovascular fitness is developed during BT, whereas muscle strength/power develops post BT/ITT. These findings would need confirming by a longitudinal study and could inform the development/management of role-related fitness during BT, ITT and through career.

The effects of acute hypoxic exposure on mechanical output and internal responses during cycling with heart rate (HR) clamped at lactate thresholds 1 and 2 (LT1 and LT2, respectively) were investigated. On separate days, 12 trained males cycled for 15 min at a clamped HR corresponding to LT1 and LT2 under normoxic or hypoxic conditions (simulated altitude of ∼3500 m and inspired oxygen fraction of 13.6%). Power output (PO), arterial oxygen saturation, ventilatory and perceptual responses were measured every 3 min, with metabolic response assessed pre- and post-exercise. At LT1, PO was consistently lower in hypoxia compared to normoxia (p < 0.01). At LT2, PO was not different between normoxia and hypoxia at 3 and 6 min (both p > 0.42) but was significantly lower in hypoxia at 9, 12 and 15 min (all p < 0.04). Overall, hypoxia induced a greater decrease in PO at LT1 (−33.3% ± 11.3%) than at LT2 (−18.0 ± 14.7%) compared to normoxia. Ventilatory, perceptual and metabolic responses were influenced by exercise intensity (all p < 0.01) but not environmental conditions (all p > 0.17). A simulated altitude of ∼3500 m is more effective in reducing cycling PO at LT1 than LT2 during HR clamped cycling while maintaining other internal loads. Therefore, normobaric hypoxia provides a greater benefit via a larger decrease in the mechanical constraints of exercise at lower exercise intensities.

Currently, there is little research on successful talent development environments (TDEs) focusing on women and girls. In response, the main aim of the present study was to compare TDEs of age-specific national teams for girls and boys in the Norwegian context (N = 216: 92 girls and 124 boys). Gender differences were investigated in the two different sports of handball and ice hockey, which in the Norwegian context represent more and less successful sports (handball and ice hockey, respectively). Before investigating gender differences in the two sports, a necessary first step was to investigate the psychometric properties of Norwegian version of the Talent Development Environment Questionnaire (TDEQ-5). Results support the Norwegian TDEQ-5 to be a reliable and valid measure within the Norwegian context. The successful sport of Norwegian handball showed no significant gender differences regarding TDE. The less successful and male dominated sport of Norwegian ice hockey showed girls to score lower on several TDEQ factors compared to boys. Results also showed ice hockey having lower TDEQ scores compared to handball. We argue that handball provide similarly functional TDEs for girls and boys, making gender equality a characteristic feature of a TDE that is successful both in terms of mass participation and international achievements.

Field-based team sports typically perform mixed-modality training, incorporating both field- and resistance-based sessions. As such, the availability of useful and reliable methods to monitor the internal and external training loads of all modalities is essential for planning effective training. Twenty-one junior developmental female rugby league athletes (age: 17.5 ± 0.5 years, height: 167.7 ± 4.6 cm, body mass: 71.1 ± 12.9 kg, and training age: 2.3 ± 1.1 year) performed two to three resistance training sessions a week for 20 weeks (9 weeks preseason and 11 weeks in-season). The volume load method and session rating of perceived exertion (sRPE) were used to quantify the external and internal load of the resistance training sessions, respectively. Volume load was categorised into either dynamic, plyometric, maximal or repeated efforts. Multiple linear mixed models were performed to determine whether significant relationships were present between the changes in volume load components and sRPE throughout the season. Significant relationships were identified between a decrease in sRPE, with associated increases in absolute and relative overall volume load (T_1,725.5 = −2.1, p = 0.04; T_1,133.5 = −2.2, p = 0.03), and relative dynamic (T_1,24.1 = −8.4, p < 0.01) and lower-body plyometric efforts (T_1,16.8 = −17.2, p < 0.01). Conversely, significant relationships were observed between an increase in sRPE, with associated increases in relative lower-body (T_1,20.3 = 12.9, p < 0.01) and upper-body repeated efforts (T_1,28.5 = 9.7, p = 0.03) as well as relative upper-body plyometric (T_1,71.1 = 2.9, p = 0.01) and maximal efforts (T_1,75.3 = 3.4, p < 0.01). These findings highlight the practicality of the volume load method for planning and monitoring resistance training in field-based team sport athletes, providing useful data for the planning of specific exercises within the in-season training week.

Coaches are recognized as key support providers, although there is limited understanding of how coach support relates to athletes' self-confidence and psychological wellbeing. This study examined relationships among perceived coach support, received coach support, coach–athlete relationship, self-confidence, and psychological wellbeing. A further aim was to identify mechanisms through which coach–athlete relationship influences self-confidence and psychological wellbeing. A total of 537 athletes (Mage = 21.83 and SD = 3.67) from a range of sports completed measures of perceived coach support, received coach support, coach–athlete relationship, self-confidence, and psychological wellbeing. Mediation analysis revealed a significant direct effect of coach–athlete relationship on perceived coach support (b = 1.44 and p = 0.04) and received coach support on psychological wellbeing (b = 1.94 and p = <0.05). Coach–athlete relationship was associated with a significant indirect effect on psychological wellbeing via received coach support (ab = 0.82 and 95% CI [0.40 and 1.26*]) but not perceived coach support. In contrast, coach–athlete relationship was associated with a significant indirect effect on self-confidence via perceived coach support (ab = 0.16 and 95% CI [0.10 and 0.22*]) but not received coach support. These findings demonstrate the significant role perceived coach support and received coach support plays in potentially explaining the relationship between the coach–athlete relationship with self-confidence and psychological wellbeing. Additionally, the results highlight that different forms of social support uniquely mediate the relationship among the coach–athlete relationship, confidence, and wellbeing. These results have implications for coaching practices, as coaches can use their relationships with athletes to provide optimal support and thereby enhance the athletes' self-confidence and wellbeing.

We examined the effects of repeated sprint training (RST) session volume on acute physiological, neuromuscular, perceptual and performance outcomes. In a randomised, counterbalanced, and crossover design, 14 healthy and trained male and female athletes (age: 23 ± 3 years) completed two sets of 10 × 40 m (10 × 40), 5 × 40 m (5 × 40), 10 × 20 m (10 × 20) and 5 × 20 m (5 × 20) sprints with 30 s rest between repetitions and 3 min rest between sets for all protocols. Average and peak heart rate, average oxygen consumption (VO₂), time >90% of maximal oxygen consumption (VO_2max), differential ratings of perceived exertion (RPE), session-RPE training load (sRPE-TL), percentage sprint decrement (S_dec), acceleration load and distance >90% of maximal sprint speed were recorded during each session. Neuromuscular performance (i.e. countermovement jump, lower-limb stiffness and isometric hamstring strength) were measured post-session, 24 h, and 48 h and compared to pre-session. A univariate analysis of variance was used to compare within- and between-protocol differences. To aid data interpretation, all effects were expressed as an effect size and accompanied by probability values (p_MET). The 10 × 40 protocol induced the greatest training load compared to all other protocols (p_MET < 0.05), including moderate to very large differences in breathlessness RPE, large differences in S_dec and time >90% VO_2max and very large differences in sRPE-TL. The 5 × 20 protocol induced the lowest training load compared to all other protocols (p_MET < 0.05), including moderate to large differences in sRPE-TL and leg muscle RPE. Heart rate, VO₂, sRPE-TL, leg muscle RPE and S_dec were similar between 5 × 40 and 10 × 20 (p_MET < 0.05), but the acceleration load was greater for 10 × 20 when compared to 5 × 40 (p_MET < 0.001), and this difference was large. Changes in neuromuscular performance across all timepoints and all protocols were unclear. Larger session volumes increase the demands of RST and by manipulating volume, sprint distance and the number of repetitions, practitioners can alter the internal and external training load.

Continuous glucose monitoring (CGM) is an emerging tool for dietary counseling in athletes. This study aimed to explore blood glucose profiles in Para cyclists and evaluate CGM accuracy at rest and during exercise. Thirteen Para cyclists, comprising eight hand bikers and five cyclists, wore a CGM sensor (Abbott) for 2 weeks. Participants recorded the timing of meals and regular training sessions and executed one standardized training session. Fifteen capillary blood glucose reference values (seven at rest and eight during the standardized training) were obtained by finger pricks. Mean glucose concentrations and time spent in hypoglycemia (<3.9 mmol/L), euglycemia (3.9–7.8 mmol/L), and hyperglycemia (>7.8 mmol/L) were calculated over 24 hrs and during daytime, nighttime, exercise, and 2 hrs postprandial periods. Mean absolute relative differences (MARD) were calculated between the CGM and capillary blood glucose. The mean glucose concentration over the 24 hr-period was 5.7 (5.6–5.8) mmol/L. Athletes were in the euglycemia range 91% of the time. Hyperglycemia was almost exclusively observed postprandially and during exercise. Hypoglycemia was restricted to the night and was particularly observed in athletes with a spinal cord injury. CGM accuracy was acceptable at rest (MARD: 12%) but markedly lower during exercise (MARD: 34%; p = 0.01), especially for hand bikers (MARD: 41%) compared with cyclists (MARD: 24%; p = 0.01). Para cyclists generally do not display signs of disturbed glucose regulation. However, the increased risk for nocturnal hypoglycemia in athletes with a spinal cord injury warrants attention. Furthermore, CGM accuracy is compromised during exercise, especially if the sensor is in proximity to highly active muscles.

Although prolonged training with stroboscopic eyewear has demonstrated potential for enhancing visuomotor skills, the acute effects of stroboscopic stimulation are not well understood. The aim of the study was to investigate the short-term effects of stroboscopic exposure during the ball-specific phase of soccer warm-up on agility performance in preplanned and unpredictable (RA) tasks. Also, these effects were examined both in tasks involving ball dribbling and without the ball, as well as under fatigued and non-fatigued conditions. Twenty-two male soccer players participated in three sessions: a familiarization session and two experimental sessions, one with and one without stroboscopic exposure during the warm-up. RA was assessed before and after each session using the 10-repetition Illinois Agility Test, with and without ball control. Results showed that stroboscopic exposure significantly enhanced RA performance in tasks involving ball dribbling (p < 0.001, effect size (ES) = 0.57), and these effects were maintained under fatigued conditions (p = 0.007, ES = 0.39). However, there were no significant improvements in RA without the ball (p > 0.05). Exercise-induced fatigue reduced RA performance in both conditions (F = 28.2; p < 0.001), regardless of warm-up type (F = 0.5; p = 0.484). Additionally, stroboscopic exposure did not significantly affect the changes of direction speed performance in the Illinois Agility Test (F = 0.5; p = 0.479). These findings suggest that integrating stroboscopic eyewear into the ball-specific phase of soccer warm-ups effectively improves RA performance in tasks involving dribbling under both non-fatigued and fatigued conditions. The effectiveness of acute stroboscopic stimulation is closely related to the specificity of the tasks in which it is applied. These insights could benefit training across various sports, encouraging coaches to adopt this approach to enhance player preparation before both training and competitions.