Research in Sports Medicine最新文献

Recovery dynamics in combat sports like judo are critical for optimizing performance and reducing injury risk. This study aimed to evaluate the time-course of physiological (creatine kinase, CK) and neuromuscular (countermovement jump, CMJ) recovery in junior judo athletes following competition. Thirteen junior-level judo athletes participated in this study. Assessments of CK and CMJ were conducted at three points: 24 hours before, 24 hours after, and 48 hours after competition. A repeated-measures ANOVA was used to analyse differences across time points, and Pearson's correlation measured associations between match duration and recovery markers. CK levels showed a significant increase 24 hours post-competition, returning to baseline by 48 hours, indicating muscle damage peaks shortly after matches. CMJ performance remained stable across all time points, suggesting a different recovery pathway for neuromuscular function. Additionally, match duration correlated with CK increase, reflecting higher physical stress. This study highlights a distinct recovery pattern for CK and CMJ, with CK peaking 24 hours post-match and CMJ showing resilience to acute competition stress. Coaches and athletes can use these findings to tailor recovery interventions, focusing on muscle recovery within the first 24 hours to optimize performance and reduce injury risk in subsequent events.

We examined the effect of anthocyanin-rich New Zealand blackcurrant (NZBC) extract on running-induced gastrointestinal symptoms in the heat. Recreationally active men (n = 12, age: 28 ± 6 yr, BMI: 24.5 ± 1.8 kg·m^-2, $\dot{V}$O_2max: 56 ± 6 mL·kg^-1·min^-1) volunteered. Participants dosed with 7 days of NZBC extract (CurraNZ®) (210 mg anthocyanins) or placebo. Exercise consisted of treadmill running for one hr at 65%$\dot{V}$O_2max (34.1 ± 0.1°C, 40.8 ± 0.2% relative humidity) with the recording of gastrointestinal symptoms during and at 60 min following recovery in normal conditions. With placebo, 11 participants (92%) reported gastrointestinal symptoms (e.g. belching, stitch), and this was reduced to four participants (25%) with NZBC extract. Using a modified visual analog scale, the accumulated score of gastrointestinal symptoms was lower with 7-day intake of NZBC extract (placebo: 112, NZBC extract: 54, p = 0.04). The prevalence of upper, lower and other gastrointestinal symptoms was reduced (upper, placebo: 75%, NZBC extract: 25%; lower: placebo: 25%, NZBC extract: 17%; other, placebo: 50%, NZBC extract: 25%). With placebo, only two participants reported severe symptoms (one participant for dizziness and nausea with that participant still reporting those in the NZBC extract condition). Seven-day intake of New Zealand blackcurrant extract reduced the incidence of gastrointestinal symptoms during 1-h of running in hot environmental conditions. Future research should examine the efficacy of NZBC extract on exercise-associated gastrointestinal symptoms in conditions in which gastrointestinal symptoms can be expected to be severe.

This systematic review aims to identify the biomechanical alterations in Osgood - Schlatter disease (OSD). A comprehensive electronic search was undertaken by two independent researchers of PubMed, Lilacs, CINAHL, Embase, Scopus, Sportdiscus, Web of Science, SciELO, and Cochrane using search terms referring to OSD, following PRISMA 2020 recommendations. Cross-sectional/observational studies or baseline measurements of longitudinal studies that provided comparisons of individuals with OSD and control participants were included. There were no restrictions on language and publication date. Studies were selected based on titles, abstracts, and full texts, and duplicates were excluded. Study quality was rated according to the Joanna Briggs Institute (JBI) Critical Appraisal Checklist. The search yielded 568 studies, and after applying the eligibility criteria, 554 studies were excluded, resulting in a final sample of 14 studies. Participants identified in the studies were adolescents (10-16 years) and were mostly male. People with OSD displayed a greater height and body mass index, as well as the presence of pelvic tilt, increased posterior tibial slope, increased condylomalleolar and tibial torsion angles, lower hip abduction (in women) and knee extension strength, and greater stiffness of the quadriceps femoris, gastrocnemius, and soleus muscles. Overall evidence quality is moderate based on JBI guidelines.

Researchers may implement magnetic resonance imaging (MRI) to evaluate neurophysiological metrics (e.g. connectivity) in athletes with sports-related concussion (SRC). MRI usage has been purported to exacerbate symptoms that mimic SRC symptomatology, possibly influencing recovery. The present study examined MRI use on SRC recovery outcomes in collegiate athletes. Ninety student-athletes (45 with MRI acutely post-SRC, 45 non-MRI) from four collegiate sites were analysed. Multivariable Cox proportional hazard regressions were used to measure the SRC recovery risk [return-to-play (RTP) initiation (RTP-I) and unrestricted RTP] with hazard ratios (HR) and 95% confidence intervals (95% CI). No hazard differences for median days to RTP-I [MRI: 10, interquartile range (IQR) = 7-15; non-MRI: 7 (IQR = 4-9)] were observed (HR = 0.75; 95% CI: 0.28-1.21). No hazard differences for median days to RTP [(MRI: 17 (IQR = 11-60); non-MRI: 12 (IQR = 8-24)] were observed (HR = 0.77; 95% CI: 0.29-1.26). MRI use post-SRC does not affect recovery; researchers/clinicians can employ such a procedure without affecting athlete recovery.

Overhead throwing sports, such as baseball and softball, pose a risk of upper extremity injuries, including the elbow. Studies on overhead throwing sports among female athletes is scarce compared to their male counterparts. A total of 329 athletes (271 softball, 58 baseball) aged 18-22 years participated in the study and answered an anonymous survey regarding their personal backgrounds and elbow injuries. The most common diagnosis among the 61 athletes who reported having elbow injuries diagnosed by a physician was ulnar collateral ligament injuries (29.5%). In addition, a total of 15.5% of athletes did not seek medical attention from a physician despite experiencing discomfort in their elbow, with time constraints being the most common reason. Athletes engaged in competitive baseball before college had a significantly elevated likelihood of experiencing elbow injuries and discomfort compared to those who engaged in non-overhead throwing sports (Odds ratio = 3.84, 95% CI 1.16-12.72, p = 0.028) but engaging in softball prior to college was not a significant risk factor for sustaining elbow injuries. Playing competitive baseball prior to college emerged as a risk factor for sustaining elbow injuries among Japanese female collegiate softball and baseball athletes.

This systematic review and meta-analysis evaluated the effects of sodium bicarbonate (NaHCO₃) supplementation on 200 m time trial performance and physiological responses in swimmers, following PRISMA guidelines. A comprehensive search across five databases identified eligible randomized controlled trials comparing NaHCO₃ with placebo. Outcomes were 200 m time, blood bicarbonate, blood lactate, and blood pH. Results showed significant increases in blood bicarbonate (SMD = 1.09, 95% CI = 0.38 to 1.79, P<0.01), blood lactate (SMD = 0.76, 95% CI = 0.24 to 1.29, P<0.01) and blood pH (SMD = 1.02, 95% CI = 0.33 to 1.71, P<0.01), but no effect on 200 m time (SMD = 0.26, 95% CI -0.58 to 1.10). These findings suggest NaHCO₃ enhances certain physiological responses but does not improve 200 m performance, though data limitations require cautious interpretation.

Chronic Ankle Instability (CAI) is a condition characterized by giving-way episodes, instability and recurrent ankle sprains. Poor sleep can increase the risk of musculoskeletal injury and sleep is known to be an important aspect of injury recovery. However, the effect sleep has on those with CAI as well as its risk for recurrent episodes of giving-way remains unclear. The purpose of this study was to examine the relationship between sleep behaviour and giving-way episodes associated with CAI. Twenty-five participants with CAI (11 M/14 F, age = 22.9 ± 2.7 years, height = 171.9 ± 8.9 cm, mass = 76.7 ± 15.9 kg) were included in this study. All participants completed baseline patient-reported outcome measures and wore a fitness tracker that measured sleep for 1 month. Seven participants had a giving-way (GW, no-giving way = NWG) episode. Those with a giving-way episode spent significantly less time asleep (GW = 325.3 ± 63.2 min, NGW = 413.9 ± 49.5 min, p < 0.001, d = 1.659), less time in bed (GW = 384.9 ± 79.0 min, NGW = 473.1 ± 55.0 min, p = 0.002, d = 1.419), less minutes in REM (GW = 59.9 ± 19.9 min, NGW = 93.5 ± 25.4 min, p = 0.002, d = 1.400) and less minutes in light sleep (GW = 197.6 ± 51.5 min, NGW = 250.2 ± 34.4 min, p = 0.003, d = 1.328) compared to those without. In conclusion, this study shows that individuals with CAI who suffered a giving-way episode had poorer sleep behaviour the night before an episode.

The aim of the present study was to examine the prevalence and associated musculoskeletal features of patellofemoral-pain (PFP) in pubertal female dancers at baseline and 12-months later. Thirty-four female dancers (aged 11.9 ± 2.5 yrs, with Tanner stages 3-5 of 68.8% for breasts and 74.2% for pubic at the baseline) were assessed for anthropometric measurements, tibial bone strength, joint ROM, patellar-tendon structure, muscle strength, and were clinically examined by an orthopaedic physician for PFP. At the baseline, 50% suffered from PFP. At the follow-up, 26.5% remained healthy without PFP; 20.6% recovered; 23.5% developed PFP; and 29.4% remained with PFP. PFP*time interaction was found for tibial bone strength (F_(3,30) = 16.534, p < .001). In tendon structure (echo-type III), joint ROM (en-pointe and hip external rotation) and muscle strength (knee flexors, knee extensors and hip abductors), Kruskal -Wallis test showed significantly different improvement/deterioration (from pre to post) between healthy-dancers, recovered-dancers, developed-PFP dancers and dancers that remained with PFP (p < 0.05). A relatively high prevalence of dancers suffered from PFP at both baseline and follow-up, with few having recovered. In dancers that developed PFP and those that remained with PFP, reduced tibial bone strength, alternated tendon structure, increased joint ROM, and reduced muscle strength were seen, compared to their healthy or recovered counterparts.

This research investigated the impact of New Zealand blackcurrant (NZBC) on 2000-meter rowing ergometer performance and cognitive abilities. Nine trained male rowers from Iran's national team participated in a double-blind, placebo-controlled crossover study, undergoing three sessions with NZBC (600 mg∙day-1), placebo (PL), and control (CL) treatments over seven days, followed by a 14-day washout period. Participants completed a 2000-meter ergometer test provided self-reported ratings of perceived exertion (RPE) and completed a cognitive function assessment five minutes following the rowing exercise. Findings indicated no significant ergogenic benefits from NZBC supplementation (420 ± 12 s) compared to PL (424 ± 15 s) and CL (423 ± 14 s), despite showing a minimal effect size (Cohen's d = 0.23). Six subjects had negligible enhancements in performance. No changes were seen in cognitive function or RPE (p > 0.05). A seven-day regimen of NZBC did not enhance rowing performance, cognitive function, or RPE.

We aimed to investigate the anterior cruciate ligament reconstruction (ACL-R) rehabilitation and return-to-sport (RTS) practices of Turkish physiotherapists. An online survey with 25 questions on ACL-R rehabilitation and RTS practices was created on Google Forms and distributed to physiotherapists via social media. Two-hundred sixty-four physiotherapists' responses were analysed. About 62.3% of therapists treated patients prior to ACL-R. Open-kinetic-chain (OKC) exercises frequently started at 4-6 weeks post-operatively (34.8%). Return-to-running cleared at 3-4 months (37%) and RTS cleared at 6-9 months (40.2%) mostly. Manual muscle tests were used by 58.4% of physiotherapists to evaluate knee strength before RTS. About 46.7% of physiotherapists did not assess psychological readiness for RTS. Physiotherapists with a bachelor's degree cleared patients for RTS earlier (<9 months) than those with postgraduate degrees (p = 0.001) but used patient-reported outcome measures (PROMs) more frequently (p = 0.010). Physiotherapists with over 5 years of experience used PROMs and psychological readiness scales more frequently (p = 0.035, p = 0.001) but also cleared patients for RTS earlier (p = 0.014). This study revealed that physiotherapist rehabilitation practices after ACL-R are not fully consistent with the current best evidence. This inconsistency in rehabilitation practices may lead to suboptimal patient outcomes after ACL-R. Encouraging physiotherapists to incorporate the latest evidence into practice might lead to better rehabilitation outcomes.