European journal of sport science最新文献

Cycling performance is strongly influenced by aerodynamics, with most resistive drag forces being attributed to the rider. The Body Rocket device (BR) is an on-bike sensor system that uses the same load cell technology as a wind tunnel, directly measuring real-time aerodynamic resistance (CdA) from the rider. This study aimed to measure the validity and reliability of CdA measures from BR in two experiments. In Experiment 1, validity of BR was assessed in wind tunnel with a rod and discs of known diameter attached to the end change CdA by a known amount. Experiment 2, examined the validity and reliability of BR in a 250m indoor velodrome. Ten cyclists performed 7 identical efforts at ∼40 km/h for 10 laps of the velodrome, the first 4 to assess validity with the same rod and discs used in the wind tunnel, with the remaining 3 without changes in resistance or the riders changing position to assess reliability. Validity results demonstrated BR measured CdA to be strongly correlated with calculated CdA from the disc addition (r = 0.99), with the smallest identified changes being 0.002 m² across wind tunnel and velodrome. Good agreement was found between theoretical and measured CdA with varying disc sizes (95% limits of agreement = −0.012 to 0.009 m²). A high level of reliability was demonstrated during Experiment 2 with strong intraclass correlation (0.99) and small coefficient of variation (1.67%). Findings of this study demonstrate BR is a valid and reliable device for measuring real-time CdA during cycling in an indoor velodrome.

The purpose of this study was to investigate the associations of fast maximal dynamic strength (MDS) and reactive strength capacity with physical match performance. Seventeen male semi-professional soccer players (age = 20.2 ± 1.3 years) performed the countermovement jump (CMJ), drop jump and a modified version of the single-leg triple crossover hop (CO_av) tests during the season to measure their fast MDS and reactive strength capacities. Strength capacities were compared with the physical match performance measured through Global Positioning System (GPS) in official matches ± 14 days after the test day. The significance level was set at p < 0.05. CMJ significantly predicted the relative number of high-intensity accelerations >4 m/s⁻² (ACC_>4) (R² = 42.9%; p < 0.01) and maximum acceleration (ACC_max) (R² = 30.6%; p < 0.05). The transformed modified reactive strength index (log₁₀ (mRSI)) also significantly predicted ACC_>4 (R² = 37.1%; p < 0.01) and ACC_max (R² = 26.3%; p < 0.05). CO_av significantly predicted the worst-case scenario for player load (WCS_PL) (R² = 27.0%; p < 0.05). The present results suggest that different lower-body strength capacities are associated with acceleration match performance.

This study investigated whether the responses of upper and lower limb muscle strength and size to resistance training (RT) are reproducible across two RT periods. Untrained males and females (age 32 ± 5 years) were randomly assigned to RT (n = 20) or a control group (n = 27). The RT group completed two identical 10-week RT periods separated by 10 weeks of detraining. The control group underwent a 10-week non-RT period. Before and after each period, the muscle cross-sectional area (CSA) of the vastus lateralis (VL) and biceps brachii (BB) was measured by ultrasound. One-repetition maximum (1RM) was measured in leg press (LP) and biceps curl (BC). Minimal detectable changes were determined. The RT group showed greater gains (p < 0.001) in muscle size and strength than the control group, with variability observed among individual responses. The reproducibility of responses within-participants was demonstrated by correlations (p ≤ 0.001) between the first and second RT periods in VLCSA (r = 0.697), BBCSA (r = 0.761), and LP1RM (r = 0.671), with a trend for BC1RM (r = 0.393 and p = 0.095). Nonresponders were identified, but none were detected in both RT periods for more than one variable. First RT correlated negatively (p < 0.05) with subsequent detraining in BBCSA (r = −0.673) and LP1RM (r = −0.488), with a trend for VLCSA (r = −0.422 and p = 0.072). In conclusion, responses to RT are reproducible when RT is repeated, indicating that the individuality of the training response has a physiological origin. Nonresponsiveness is rare and should not be justified solely by one variable. Responses to detraining suggest that greater RT gains may also diminish faster.

This study aimed to compare respiratory patterns and gas exchange during tennis and treadmill running at similar oxygen uptake. On three experimental days, 15 elite players (7 female, 8 male) completed a standardized tennis protocol (TP), a treadmill-based incremental running test (RT), and a metabolically matched running protocol (RP). TP (Day 1) included low or high running loads (RL, RH) and low or high stroke velocities (SL, SH) which were combined in four incremental ball-machine stages (TP₁:RL + SL; TP₂:RL + SH; TP₃:RH + SL; TP₄:RH + SH). RT (Day 2) determined running speeds matching the oxygen uptake of each TP stage. RP (Day 3) replicated TP's mean oxygen consumption and stage duration through treadmill running. Metabolic and respiratory responses (portable spirometry) and external loads (stroke velocity) were compared between TP and RP. In tennis, mean oxygen uptake (p < 0.001), energy expenditure (p < 0.001), and respiratory exchange ratio (p < 0.001) as well as respiratory responses increased significantly between Stage 1–4. No differences in metabolic responses as well as in breathing frequency (bf), ventilation ($$’E), inspiration (tI), and expiration time (tE) were observed between TP and RP. In contrast, the number of breathing plateaus per stage (NP) was significantly higher in TP compared to RP during TP₂ (5.9 ± 3.8 vs. 0.4 ± 0.5 times, p < 0.001), TP₃ (2.6 ± 2.7 vs. 0.3 ± 0.6 times, p = 0.04), and TP₄ (4.6 ± 4.1 vs. 0.3 ± 0.6 times, p < 0.001). Breathing plateaus appear characteristic for tennis when hitting hard without affecting metabolism. Exploring individual breathing patterns can be recommended in practice.

High-quality sleep is necessary for optimal health and promoting recovery from training, contributing to sport performance. Research suggests a high prevalence of poor sleep duration and quality in athletes. Reduced sleep duration has been shown to be deleterious to performance, but less is known about sleep quality and its relationship to training responses and performance. In 26 elite male (n = 10) and female (n = 16) collegiate swimmers, we assessed sleep quality (sleep duration (hrs), sleep debt (hrs), slow-wave sleep (SWS_hrs and SWS%), rapid-eye movement (REMhrs and REM%)), training measures (strain (AU), average heart rate (HR) (ExHR_avg) and maximum exercising HR (ExHR_max)), and swimming performance (200yd time trial swim) during heavy training, preceding championship competition. Collection of sleep data was matched to days of training data collection, and also to the day preceding the performance swim. Pearson correlations were utilized to determine relationships between variables unless sex effects existed in which case linear regression analyses were utilized to control for sex differences in variables. In all swimmers, sleep duration is related to strain (R = −0.78; p = 0.01), and sleep debt is related to ExHR_avg (R = 0.53; p = 0.005). SWS_hrs negatively is related to ExHR_avg (R = −0.42; p = 0.032). Controlling for sex, sleep duration predicted swimming performance (R² = 0.881; p < 0.001), swimmers with greater sleep durations exhibited faster swim race times. Similarly, when controlling for sex, SWS% predicted swimming performance (R² = 0.883; p < 0.001), swimmers with greater SWS% exhibited faster times. Sleep quality measures were related to training adaptations and swimming performance was predicted by sleep quantity and quality. Athletes should obtain adequate sleep to support recovery and optimize training and performance.

Nine ultra-endurance athletes completed a randomised, crossover trial involving two 28-day dietary arms during which the athletes consumed a carbohydrate-rich diet (carbohydrate 58 ± 3, protein 15 ± 2 and fat 26 ± 2%) containing low- or high-glycaemic-index (LGI or HGI, respectively) carbohydrates. At the start and end of each dietary arm, participants performed a fasted 3-h submaximal run outdoors before ingesting either a low (GI = 32, isomaltulose [Palatinose]) or high (GI = 100, maltodextrin) glycaemic index drink (0.75 g/kg bm/h over 3.5 h). Participants then completed a treadmill run to exhaustion at 74 ± 1% v$$O_2peak, with pulmonary gas exchange measured over the first hour. Interstitial glucose [iG] was measured via continuous glucose monitoring (Supersapiens, Atlanta, USA). Data were analysed ANOVA and post hoc t-tests with Bonferroni adjustment as appropriate, with p ≤ 0.05 accepted as significant. Mean 24-h [iG] was similar between diets (LGI:102 ± 5 vs. HGI:100 ± 5 mg/dL). [iG] variability measures, including standard deviation (LGI:17 ± 1 vs. HGI:18 ± 2 mg/dL, p = 0.016) and coefficient of variation (LGI:16 ± 1% vs. HGI:18 ± 1%, p = 0.0003), were lower in the LGI diet, with a reduced percentage of time spent below the recommended range (LGI 2 ± 1% vs. HGI 4 ± 2%, p = 0.006. Level 1 [55–69 mg/dL] LGI 1 ± 1% vs. HGI 3 ± 2, p = 0.005). Carbohydrate oxidation during the first hour of the run test was reduced in the LGI diet arm (ΔLGI −0.14 ± 0.32 vs. ΔHGI 0.06 ± 0.28 g·min⁻¹, p = 0.016) but endurance capacity was similar across diets. Adopting a 28-day LGI carbohydrate-rich diet and incorporating isomaltulose improved glycaemic variability and reduced time spent below the target glycaemic range with evidence of similar endurance performance capability when compared to a HGI carbohydrate-rich diet.

This study investigated actions preceding goals in male and female players across 6 FIFA World Cups. This is the first longitudinal, multi-sex analysis of goal actions using world-class data, extending validity and findings beyond the current evidence base (domestic, single-sex studies). In total, 2995 actions preceding goals from open-play were analysed across the last 6 men's’ and women's FIFA world cups (2014–2023) using the modified Bloomfield method. Additionally, possible longitudinal (tournament cycle), sex, and role-based (i.e., scorer vs. assister) differences were examined using Bayesian and chi-squared analyses. Linear advancing movements (≈41%), particularly sprinting, were the most prevalent actions leading to goals, followed by deceleration (≈22%) and turns (≈19%) (Cramer's V = 0.27–0.38; p < 0.05). Longitudinal, between-sex and between-role (i.e., scorer vs. assister) differences were predominantly minimal for movement types (Bayes Factors [BF₁₀] < 0.01; Cramer's V = 0.02–0.06; p > 0.05). Sprinting preceded goals more prevalently for males (43.4%) and scorers (43.2%), when compared with females (39.0%) and assisters (39.1%), respectively (Cramer's V = 0.04–0.10; p < 0.05). Female players performed significantly greater proportions of actions at high intensity versus males (53.0 vs. 47.9%; BF₁₀ = 38.7; Cramer's V = 0.369; p < 0.05), and the 2022/2023 cycle had lower proportion of actions at high intensity compared to earlier cycles (46.6% vs. 52.3%–52.5%; BF₁₀ = 0.019; Cramer's V = 0.06; p < 0.05). This analysis highlights the importance of sprinting, decelerating, and turning for goal-scoring. Therefore, enhancing players' physiological and mechanical reserves to undertake these actions, as and when required during match-play, appears prudent. Further, analysts/coaches may apply this information to identify decisive goal-scoring actions and design targeted training drills accordingly.

The impact of National Governing Body talent development programmes on injury, illness, sleep, wellbeing and stress of developing elite athletes (DEA) is poorly understood. Therefore, we examined differences between age-matched DEA (n = 42, 25 females; Mage = 21.0; SD = 2.5) and recreationally active athletes (RAA, n = 79, 56 females; Mage = 21.2; SD = 2.8) on these variables over 14 weeks of training using a weekly online monitoring tool. Compared to RAA, DEA completed a greater proportion of planned training and competition without health problems or reducing training volume. Despite training more hours (DEA M = 17.1; SD = 5.1, RAA M = 6.0; SD = 3.2, p < 0.001), DEA reported similar recovery, higher readiness to train, more sleep, better sleep quality, higher wellbeing (DEA M = 68%; SD = 15, RAA M = 56% SD = 16, p < 0.001), lower stress and fewer injuries, resulting in fewer days lost to injuries than RAA (DEA M = 0.4; SD = 1.5, RAA M = 2.5 SD = 6.7, p = 0.01). There was no difference between DEA and RAA in the prevalence of illness or days lost due to illness. In conclusion, despite a greater training and competition load, DEA reported better health and wellbeing than RAA, suggesting the increased demands of National Governing Body talent development programmes may not adversely affect health. These findings also highlight the benefits and importance of talent development systems undertaking a holistic and multidisciplinary approach to athlete monitoring.

The positive impact of physical activity on cognitive functions is well established and varies by exercise type, with open-skill sports—activities involving high uncertainty—offering distinct advantages. Although team sports are traditionally considered open-skill activities, parkour provides a dynamic and varied environment. This study compared the effects of indoor team sports (consistent environment) and parkour (varied environments) on cognitive functions. Forty healthy young adults (mean age: 21.5 ± 3 years) were divided into a team sports group (TS, n = 19) and a parkour group (PK, n = 21). Both groups trained twice a week for 4 weeks, with sessions lasting 2 hours each. Cognitive performance was assessed pre- and posttraining using the Trail Making Test (TMT), Letter Cancellation Test (LCT), Change Blindness Test (CB), visual memory tests, and short- and long-term memory recall. The PK group significantly improved in TMT and CB tests (p < 0.001), whereas the TS group showed no significant changes (p > 0.05). Both groups improved similarly in the LCT and working memory tests (p < 0.001). However, the PK group outperformed the TS group in long-term memory tasks (p < 0.001). These findings suggest that parkour's exploratory nature enhances observation skills, visuospatial attention, and long-term memory more effectively than indoor team sports. Training in diverse environments appears to yield greater benefits for visual and cognitive capacities than practice in static settings.