Previous Level Of Performance Research Articles

Surgical Closure of Equine Abdomen, Prevention, and Management of Incisional Complications.

Although rarely fatal, complications of ventral midline laparotomy incision in equine patients increase hospitalization cost and duration and may jeopardize return to athletic function. Therefore, many techniques have been developed to reduce their occurrence and expedite their resolution when they occur. Our technique of celiotomy incision closure includes the use of tension sutures (vertical U mattress) of polyglactin 910 on the linea alba, which is then apposed by polyglactin 910 interrupted sutures or a simple continuous pattern suture with a stop midway before routine closure of the superficial layers. The celiotomy incision is protected by an elastic bandage during the immediate postoperative period. This technique has been associated with favorable results: 5.3% confirmed incisional infections after a single celiotomy and 26.7% after repeat celiotomy. The overall incisional complication (serous/sanguineous discharge, hematoma, infection, hernia formation, and complete wound breakdown) occurrence was 9.5% and 33.3% after single and repeat laparotomy, respectively. In cases considered more susceptible to infection (early relaparotomy or laparotomy incisions longer than 30 cm), negative pressure therapy was found easy to apply on closed incisions. No detrimental effects were observed. However, the potential prophylactic benefit of this therapy needs to be confirmed in a larger group. In infected laparotomy wounds requiring drainage, the use of negative pressure therapy seemed to have a positive effect on the formation of granulation tissue. However, there was no control group to allow statistical confirmation. Finally, one case of complete breakdown of the laparotomy incision was managed by stainless steel retention sutures, the application of negative pressure therapy, and a hernia belt. At re-evaluation 15 months post-surgery, several small hernias were detected, but the horse had returned to his previous level of sports performance and had not shown any episode of colic.

Equine Musculoskeletal Pathologies: Clinical Approaches and Therapeutical Perspectives-A Review.

Musculoskeletal injuries such as equine osteoarthritis, osteoarticular defects, tendonitis/desmitis, and muscular disorders are prevalent among sport horses, with a fair prognosis for returning to exercise or previous performance levels. The field of equine medicine has witnessed rapid and fruitful development, resulting in a diverse range of therapeutic options for musculoskeletal problems. Staying abreast of these advancements can be challenging, prompting the need for a comprehensive review of commonly used and recent treatments. The aim is to compile current therapeutic options for managing these injuries, spanning from simple to complex physiotherapy techniques, conservative treatments including steroidal and non-steroidal anti-inflammatory drugs, hyaluronic acid, polysulfated glycosaminoglycans, pentosan polysulfate, and polyacrylamides, to promising regenerative therapies such as hemoderivatives and stem cell-based therapies. Each therapeutic modality is scrutinized for its benefits, limitations, and potential synergistic actions to facilitate their most effective application for the intended healing/regeneration of the injured tissue/organ and subsequent patient recovery. While stem cell-based therapies have emerged as particularly promising for equine musculoskeletal injuries, a multidisciplinary approach is underscored throughout the discussion, emphasizing the importance of considering various therapeutic modalities in tandem.

Long-term performance of show-jumping horses and relationship with severity of ataxia and complications associated with myeloencephalopathy caused by equine herpes virus-1.

Equine herpesvirus myeloencephalopathy (EHM) has severe impact on the sport horse population. Study the influence of EHM on the likelihood of affected horses to return to their previous performance and investigate the association of clinical variables with prognosis. Twenty-six horses positive for equine herpesvirus type 1 (EHV-1) were admitted to a veterinary teaching hospital (VTH) during a natural EHM outbreak at an international jumping event. Data collected from the VTH, the International Equestrian Federation, and surveys completed by the riders and horse owners were retrospectively analyzed. Horses affected by EHM had 68% chance of returning to exercise, and 52.9% were able to achieve their preoutbreak performance level. Horses with an ataxia grade at admission ≥4/5 had an increased fatality rate (P < .05) and 10% chance of reaching their preoutbreak performance level. None of the horses with both vascular and urinary complications returned to their previous performance level. Finally, horses vaccinated against EHV-1 and those with urinary complications had a 71.4% and 43.7% fatality rate, respectively. Horses affected by EHM were able to return to their previous performance levels, but certain clinical variables were negatively associated with postoutbreak performance. Ataxia grade upon admission and the development of systemic signs of vasculitis and urinary complications were potential poor prognostic indicators in sport horses. Variables linked to fatality included prior vaccination against EHV-1, ataxia grade upon admission, and the development of urinary complications.

Musical instruments, oral problems and prosthodontics: A review and a clinical report of a musician menopausal woman

The condition of teeth and the function of the oral organs are important when playing musical, especially brass or wind, instruments. This article describes the prosthodontic treatment provided for a musician who had lost a tooth and her subsequent musical performance. The relevant literature is also discussed. A 49-year-old professional clarinet player who fractured and avulsed the upper left central incisor during a fall sought maxillofacial rehabilitation for the missing tooth to maintain her ability to play the clarinet. Her treatment consisted of a provisional removable prosthesis with an acrylic base and clasps followed by a final fixed implant and conventional prostheses, designed accordingly. Her satisfaction with the prostheses was assessed by a self-reported questionnaire. The dental treatment helps to ensure that the musicians with oral, mainly prosthodontic, problems can continue playing the wind or brass instrument, especially the clarinet at their previous performance level professionally.

A Longitudinal and Multilevel Investigation of Grateful Climate in Cultivating Psychological Resilience: The Mediating Role of Athlete’s Gratitude

For athletes facing high levels of pressure and experiencing significant psychological and physical demands, mere adaptation to the pressure is insufficient. They must also possess psychological resilience, which entails the ability to rebound from stressful conditions or even surpass their previous performance levels. Previous research has indicated that receiving unilateral positive support is one of the factors contributing to psychological resilience. Therefore, the objective of this study is to examine the relationship between athlete gratitude and psychological resilience. Gratitude is considered a relational, reciprocal, and prosocial construct that aligns well with the interdependence inherent in the sports context. This research focuses on both the environmental and individual levels of gratitude, drawing on the multilevel model of gratitude framework. The study investigates how the grateful climate, representing environmental gratitude, influences athletes’ psychological resilience through individual gratitude. A longitudinal survey method was employed, involving a total of 289 high school student-athletes from 49 teams who participated in a five-wave survey conducted over a three-year period. The results indicate a significant influence of the grateful climate on changes in athletes’ psychological resilience. This influence operates through individual gratitude, which acts as a mediating factor in predicting changes in psychological resilience. The findings of this study can provide practical guidance for human resource managers and educators by highlighting the importance of fostering gratitude at both the individual and environmental levels to enhance athletes’ psychological resilience.

PLAR: a combined percutaneous and arthroscopic treatment for iliotibial band syndrome description of surgical technique and short-term results: description of surgical technique and short-term results

IntroductionDescription of a new surgical procedure (percutaneous lengthening and arthroscopic release, PLAR) that combines all the possible interventions on the iliotibial band (ITB), and evaluates its outcomes in a group of distance runners diagnosed with ITBS.MethodsA prospective observational study was made of distance runners diagnosed with ITBS and operated upon using the PLAR technique between 1 and 2018 and 31 June 2020. The surgical technique is described in detail, and the demographic data and functional outcomes measured by the sports performance scales Activity Rating Scale (ARS) and International Knee Documentation Committee (IKDC) are presented.ResultsA total of 14 patients were included, with a mean follow-up of 16 months (range 12–42 months). All the patients resumed their previous sporting activity after an average of 4 (range 2.5-6) months, and no complications were recorded. In all cases, statistically significant improvement was evidenced by the ARS and IKDC scales following PLAR (p < 0.001), with excellent outcomes in 71% of the cases according to the ARS scale and in 86% according to the IKDC scale (mean difference between preoperative and final follow-up scores of 12.1/16 and 34.2/100 points, respectively).ConclusionThe PLAR technique is effective in allowing a return to previous sports performance levels in a short period of time among patients with ITBS refractory to conservative management, with a high satisfaction rate and the absence of complications.

The Effect of asymptomatic versus mild symptomatic COVID-19 infection on male athletic performance: A cross-sectional clinical research

Objective: Novel Coronavirus Disease 2019 (COVID-19) pandemic has affected the whole world and still host many obscurities. Researches involving athletes investigated the lifestyle, athletic performance and psychological alterations compared to pre-pandemics and returning-to-sports process. But, knowledge about the past symptomatic COVID-19 effects on athletic performance is immature. Athletes are prone to asymptomatic or mild symptomatic COVID-19 rather than severe form; so this study aimed to compare the muscular athletic performance, cardiorespiratory function and psychological condition after COVID-19 between asymptomatic and mild symptomatic athletes. Materials and Methods: This case-control designed study recruited a total of 40 young adult male long-distance runners who survived COVID-19 asymptomatically (n=20), and with mild symptoms (n=20). All of the subjects had completed the isolation period and been approved to return-to-sports. The age, anthropometric properties, athletic license term and dominant hand and foot sides of the subjects were recorded. The muscular strength of upper limb, isokinetic and isometric muscular strengths of lower limb flexor and extensors, and VO2max were measured. The self-reported depression, anxiety and COVID-19-related fear were evaluated. Results: The values of all muscular strength parameters, VO2max and anxiety level were similar between the groups (p&gt;0.05). However, the levels of depression (p=0.048) and COVID-19-related fear (p=0.012) were significantly higher in mild symptomatic group in comparison with asymptomatic (p&lt;0.05). Conclusions: Mild symptomatic COVID-19 did not affect muscular athletic performance and cardiorespiratory fitness, but caused psychological disorder in comparison with asymptomatic infection. In case of COVID-19, the psychological state of the athlete should be paid close attention. We suggest the supply of adequate and quick psychological support while targeting the previous level of physical fitness and athletic performance in the returning-to-sports process.

Total removal of the fourth metacarpal bone in an Icelandic horse.

Fractures of the splint bones are the most common fractures in horses. Various treatment options for splint bone fractures (MC/MT II and IV), including conservative and surgical management, have been described. This report describes an acute splint bone fracture due to external trauma in a 17-year-old Icelandic mare. The fracture was diagnosed as an open multifragment fracture of the proximal third of the fourth metacarpal bone (MCIV) in the right front limb. Surgery was performed with the horse under general anaesthesia. The distal fragments were removed, and the distal part of the proximal remnant splint bone was cut with an osteotome. During the postoperative period, a routine x-ray-control two days after surgery showed a dislocated fracture of the remaining proximal part of the fourth metacarpal bone. In a second surgery, the proximal part of MCIV was entirely removed. After a reconvalescence period of 5 month, the horse reached her previous level of performance as a leisure horse. The mare is still free of lameness 6 years after the incident.

Effects of individualised rehabilitation for horses with equine herpesvirus myeloencephalopathy

SummaryIn 2019, a Swedish outbreak of equine herpes virus type 1 (EHV‐1) led to varying neurological symptoms also known as EHM (equine herpes myeloencephalopathy). Nineteen of the 39 exposed horses developed EHM. EHM outbreaks have become more common in recent decades and can result in large economic losses for the horse industry in addition to clear welfare implications. However, there is limited information about the estimated time to recovery from EHM and return to previous level of performance and there is limited published information regarding neurological rehabilitation in horses. Our objective was to describe and evaluate the potential benefit of implementing individual rehabilitation plans for horses recovering from EHM. Four horses with EHV‐1 and with clinical signs of neurological dysfunction were selected. All horses were initially hospitalised at an intensive care unit between 4 and 9 days and approximately 3 months after the outbreak they were considered sufficiently recovered to start a rehabilitation programme. The programs mainly focused on regaining proprioception, core stability and strength with consideration given to fatigue in the horse and risk to the handlers. A repeated neurological examination was performed six times over the first year and the rehabilitation programs were modified accordingly. The owners considered the horses ‘normal’, both mentally and physically, between 6 and 8 months after the outbreak. All horses were back to their previous level of performance after 8–11 months. A limitation of the study was a small study population with no control group. Our conclusions are that horses suffering from severe EHM may return to an acceptable athletic function given time and an individually adapted rehabilitation program. To potentially show that an individually adapted rehabilitation plan brings the horse back to acceptable function faster than nonspecific rehabilitation, a case‐control study would be required.

Successful transabdominal treatment of a chronic splenic abscess caused by Clostridium perfringens after penetrating external trauma in a horse

SummaryThis report describes the successful treatment of a traumatic splenic abscess by transabdominal drainage under ultrasonographic guidance. The gelding presented for investigation of recurrent pyrexia, mild abdominal pain and weight loss after a penetrating trauma to the caudolateral abdomen 5 weeks previously. At this stage, the abdominal wall had healed and a splenic abscess was diagnosed. Before treatment, mature adhesions between the abdominal wall and the spleen were confirmed by diagnostic laparoscopy in the standing horse. Transabdominal ultrasound‐guided drainage was performed, followed by intralesional placement of a balloon catheter for 2 weeks and a silicone drain for an additional week. Postoperatively, the horse was treated with intralesional and systemic antibiotics. The healing process was unremarkable and the horse was discharged 4 weeks postoperatively. At 10 months post‐surgery, after the body condition score had normalised, the horse returned to its previous level of performance.

Poster 107: Biomechanical Effect of “AIGHL Reconstruction” for Bankart Lesion in Thrower’s Shoulder: A Novel Surgical Treatment to Maintain Maximum Shoulder External Rotation Angle after Surgery

Objectives: For anterior shoulder instability, antero-inferior labral repair (Bankart repair) is a reliable surgery to prevent shoulder dislocation. However, in biomechanical and clinical studies, maximum shoulder external rotation angle is reported to be decreased by about 10 degrees due to shortening of the anterior band of the inferior glenohumeral ligament (AIGHL) length after Bankart repair. For overhead throwing athletes, the 10 degrees reduction in shoulder external rotation makes it difficult to return to the previous performance level, although it does not affect daily activity. To prevent shortening of the AIGHL length, an AIGHL reconstruction was developed using fascia lata graft. Preliminary clinical results in overhead throwing athletes showed that a throwing program could start with complete restoration of maximum shoulder external rotation angle 3 months after AIGHL reconstruction. In this study the effect of AIGHL reconstruction on shoulder external rotation and anterior stability for simulated Bankart lesion in a cadaveric model of a thrower’s shoulder was evaluated (Fig. 1). Methods: Eight cadaveric shoulders were tested at 60° of glenohumeral abduction (90° of shoulder abduction) to simulate throwing motion. Glenohumeral translations at 60° and 90° of external rotation, maximum humeral rotational range of motion, and humeral head shift were measured using goniometer and MicroScribe 3D-digitizer. Each specimen was subjected to five experimental stages: (1) intact condition; (2) simulation of thrower’s shoulder by anterior capsular stretching based on previously reported method; (3) creation of Bankart lesion (AIGHL and the labrum were detached at glenoid side); (4) Bankart repair using three suture anchors; and (5) AIGHL reconstruction using allograft of fascia lata. In the AIGHL reconstruction, allograft was patched between the detached AIGHL and glenoid at maximum shoulder external rotation position to restore the original AIGHL length (Fig. 2). For statistical analysis, linear mixed-effects model and Tukey’s post-hoc analysis were used. Results: After 20% stretching, shoulder external rotation and anterior translation were significantly increased (intact 128.3° and 2.8mm, thrower’s shoulder 141.9° and 7.3mm, p&lt;0.001). Creation of Bankart lesion significantly increased anterior translation (8.3mm) compared with intact condition (p=0.021). Bankart repair completely restored anterior translation (3.0mm) to intact level; however, maximum shoulder external rotation angle after Bankart repair (134.8°) was significantly less than that in thrower’s shoulder (p=0.009). AIGHL reconstruction completely restored anterior translation (6.5mm) to thrower’s shoulder without decreasing maximum shoulder external rotation angle (144.4°) compared with thrower’s shoulder (Fig. 3 &amp; 4). At maximum humeral external rotation, the humeral head was significantly shifted superiorly after creation of Bankart lesion compared with intact condition(p=0.005). After Bankart repair, the humeral head was significantly shifted inferiorly from the Bankart lesion (p=0.003) and was significantly inferior relative to the position after AIGHL reconstruction (p=0.007). Conclusions: While Bankart repair completely restored anterior translation to the intact level (tighter than thrower’s shoulder), AIGHL reconstruction completely restored to the thrower’s level. Furthermore, maximum shoulder external rotation angle was maintained after AIGHL reconstruction although Bankart repair decreased external rotation significantly. Therefore, AIGHL reconstruction can be a useful surgical option for Bankart lesion in overhead throwing athletes to restore anterior stability while maintaining maximum shoulder external rotation angle after surgery.

Return to sport after conservative treatment of elbow dislocation in judoka.

Injuries to the elbow are frequent in judo combat, but studies on down-time and effect on performance after conservative treatments are rare. This issue is particularly relevant for elbow dislocations in high-performance patients such as elite athletes. The purpose of this study was to evaluate (1) time-loss and (2) the regained level of performance in judoka after conservative treatment of simple elbow dislocation. In cooperation with the European Judo Union, judoka were asked to complete a 139-item survey regarding elbow injuries they suffered during their career. Besides demographics, injury data, diagnosis and treatment options, the athletes were asked about down-time and reductions in performance level. This study enrolled 108 judoka with conservative treatment of elbow dislocation out of a population of 5426 volunteers. 69% (n=74) reported a time-loss of less than three months; 6% reported a time-loss of more than six months. The majority (68%, n=73) reported that they had returned to their previous performance level, while 22% (n=24) suffered from a slightly reduced level of performance. In the subgroup of international and national athletes (n=54), 63% returned to judo after less than three months, with 72% achieving the same level and 15% reporting a slightly reduced performance level. Level of performance and time lost after conservative treatment for elbow dislocations were comparable for male and female judoka. Approximately two out of three judoka returned to the same level of performance after three months of down-time after undergoing conservative therapy for simple elbow dislocations. Despite the high performance level of the study population, conservative treatment of simple elbow dislocation resulted in satisfactory outcomes. The presented data can guide medical professionals and competitive-level contact-sport athletes with respect to expectations in the process of returning to sport.

Return to play and performance guidelines in rugby union

Models and guidelines on factors associated with the safe return to play (RTP) of an injured athlete have been established, but very limited research has been conducted on components necessary for returning an athlete to their previous level of performance, known as return to performance (RTPerf). The study aimed to establish guidelines applicable to RTP and RTPerf in rugby union. A mixed-methods study design using an e-Delphi survey was conducted to obtain the opinions of medical team members of the Currie Cup rugby unions across South Africa on RTP (Part 1 of the study). In Part 2, medical team members and coaches of the Free State Rugby Union were consulted for RTPerf guidelines. Part 1 of the study comprised a three-step decision-based RTP model used to identify RTP components in rugby. The e-Delphi questionnaire was compiled based on literature analyses and vast experience of the authors. Part 1 involved three steps of integrated guidelines for RTP decision-making in rugby union established by agreement (&gt;80%) (first or second round): Step 1: medical history; Step 2: evaluation of participation risk; and Step 3: decision modifiers. Part 2 focused on components to consider during the RTPerf decision-making process, including psychological readiness, limb symmetry index, acute:chronic training load, external load and internal load. Twelve key performance indicators (KPIs) to measure RTPerf in rugby reached consensus (&gt;80%). The comparison of performance profiles and current KPIs of a rugby player could be used to evaluate the player's performance level and whether they truly achieved RTPerf.

Conservative management of equine tarsal collateral ligament injuries may allow return to normal performance.

To describe type and distribution of tarsal collateral ligament (CL) injuries and to assess the long-term outcome in horses treated conservatively. 78 horses (median age, 7 years [IQR, 4 to 9.75 years]) of different breeds and disciplines. Retrospective analysis (2000 through 2020) of horses with tarsal CL lesions diagnosed on ultrasound. The resting time, ability to return to work, and performance level after the injury were compared between horses having a single ligament (group S) or multiple ligaments (group M) affected and according to the case severity. Most of the horses (57/78) presented a single CL injury, while 21 had multiple CLs affected simultaneously, for a total of 108 CLs injured and 111 lesions. In both groups, the short lateral CL (SLCL) was the most commonly affected (44/108), followed by the long medial CL (LMCL; 27/108). Enthesopathies (72.1%) were more frequent than desmopathies alone (27.9%) and involved mostly the proximal insertion of the SLCL and the distal attachment of the LMCL. Conservative treatment (n = 62) consisted mainly of stall rest. The median resting time (120 days [IQR, 60 to 180 days]) did not significantly differ between the 2 groups (group S vs M) or according to the severity. Most horses (50/62) were able to return to work within 6 months. Horses that did not return (12/62) were more likely to have severe lesions (P = .01). Thirty-eight horses were able to perform at a level equal to or higher than before the injury. This study highlights the importance of thorough ultrasound assessment of tarsal CL injuries and demonstrates that conservative management is a viable option to allow these horses to return to previous performance level.

Outcome following local injection of a liquid amnion allograft for treatment of equine tendonitis or desmitis – 100 cases

BackgroundTendon and ligament injuries are significant causes of loss of use and early retirement in performance horses. Amniotic fluid and tissue are excellent sources of growth factors and cytokines important in tendon and ligament healing. Thus, an equine-origin liquid amnion allograft (ELAA) may be beneficial in the treatment of equine tendonitis and desmitis. Objectives of this study were to report the outcome achieved (i.e. ability to return to work) for horses diagnosed with tendonitis or desmitis lesions treated with local injection of ELAA and to compare these outcomes to those reported for other regenerative medicine modalities.MethodsA prospective, multi-center, non-blinded clinical trial was conducted. Equine veterinarians at 14 sites were selected to participate in the data collection for the trial. Criterion for inclusion was a horse presenting with lameness which was attributed to tendonitis or desmitis by diagnostic anesthesia and/or imaging. These horses were subsequently treated by local injection of the lesion with ELAA by the attending veterinarian. Standardized questionnaires describing each horse’s signalment, discipline, ability to return to work, and any adverse events were completed and submitted by the attending veterinarian following a minimum of six months of follow-up. The current literature was reviewed to identify clinical studies reporting outcomes of equine tendonitis/desmitis lesions treated with other regenerative therapies. Contingency table analyses were performed comparing outcomes.ResultsQuestionnaires for 100 horses with 128 tendonitis and desmitis lesions met the inclusion criteria. Of these, 72 horses with 94 lesions returned to or exceeded their original level of work, 10 horses with 13 lesions returned to work but could not perform to previous standards, and 18 horses with 20 lesions did not return to work as a result of the injury. No differences were observed when outcome of horses treated with ELAA were compared to those of similar studies using other regenerative therapies.ConclusionsTreatment of tendonitis and desmitis lesions by local injection of ELAA resulted in similar outcomes for horses returning to previous level of performance as other regenerative modalities such as mesenchymal stem cells, platelet-rich plasma, and autologous conditioned serum; however, blinded placebo-controlled studies are indicated.

Return to play and performance in the National Basketball Association after undergoing operative or nonoperative treatment for foot fracture

BackgroundThe incidence of distal lower extremity fractures in National Basketball Association (NBA) athletes continues to increase. There is a paucity of data regarding return-to-play (RTP) rates and performance after sustaining foot fractures in these athletes. The purpose of this study is to quantify RTP rates and performance in NBA players after sustaining a foot fracture. MethodsSixty-two NBA athletes suffered foot fractures between 2005 and 2021 according to publicly accessible online data. Each athlete was matched to a control player based on age at start of career, age at index injury year, body mass index (BMI), and position played. Performance statistics from 3 seasons prior and 3 seasons following the index injury season were recorded. ResultsWe found that players who suffered foot fracture injuries are expected to make a full recovery and reach their previous level of performance within three years. 100% of players treated nonoperatively returned to play; meanwhile only 90% of players who were treated operatively returned to play. This difference is statistically significant. ConclusionNBA athletes have a high RTP rate after sustaining a foot fracture. Players may experience an initial decrease in playing time and performance when returning to play, however, these variables were found to return to baseline over time. After three seasons, player statistics returned to baseline in mostly every category, including player efficiency rating (PER). We found that players are expected to make a full recovery and return to their previous level of performance, regardless of whether they were treated operatively or not. Players treated nonoperatively returned to play at a rate of 100% meanwhile those treated operatively returned at a rate of 90%. Therefore, it is our recommendation that players opt for nonoperative treatment when possible.

The effects of long-term methylphenidate administration and withdrawal on progressive ratio responding and T2 MRI in the male rhesus monkey

Methylphenidate is a frequently prescribed drug treatment for Attention-Deficit/Hyperactivity Disorder. However, methylphenidate has a mode of action similar to amphetamine and cocaine, both powerful drugs of abuse. There is lingering concern over the long-term safety of methylphenidate, especially in a pediatric population, where the drug may be used for years. We performed a long-term evaluation of the effects of chronic methylphenidate use on a behavioral measure of motivation in male rhesus monkeys. Animals were orally administered a sweetened methylphenidate solution (2.5 or 12.5 mg/kg, twice a day, Mon-Fri) or vehicle during adolescence and into adulthood. These animals were assessed on a test of motivation (progressive ratio responding), during methylphenidate treatment, and after cessation of use. Moreover, animals were evaluated with quantitative T2 MRI about one year after cessation of use.During the administration phase of the study animals treated with a clinically relevant dose of methylphenidate generally had a higher rate of responding than the control group, while the high dose group generally had a lower rate of responding. These differences were not statistically significant. In the month after cessation of methylphenidate, responding in both experimental groups dropped compared to their previous level of performance (p = 0.19 2.5 mg/kg, p = 0.06 12.5 mg/kg), and responding in the control animals was unchanged (p = 0.81). While cessation of methylphenidate was associated with an acute reduction in responding, group differences were not observed in the following months. These data suggest that methylphenidate did not have a significant impact on responding, but withdrawal from methylphenidate did cause a temporary change in motivation. No changes in T2 MRI values were detected when measured about one year after cessation of treatment.These data suggest that long-term methylphenidate use does not have a negative effect on a measure of motivation or brain function / microstructure as measured by quantitative T2 MRI. However, cessation of use might be associated with temporary cognitive changes, specifically alteration in motivation. Importantly, this study modeled use in healthy individuals, and results may differ if the same work was repeated in a model of ADHD.

Clinical and ultrasonographic evaluation of the treatment of naturally occurring front limb suspensory branch injuries in sport horses with a standardized leukocyte poor platelet-rich plasma

This study was performed to evaluate the effectiveness of ultrasound-guided injections in lesions of suspensory ligament branches of an autologous standardized leukocyte poor platelet-rich plasma. Nine sport horses with front legs suspensory ligament branch desmopathies (SLBD) were included in the study. A clinical examination and ultrasound evaluation of the affected suspensory ligament branches were carried out at the time of inclusion and on a monthly basis for 6 months after the first platelet-rich plasma (PRP) injection. Twelve branches were treated with 2–3 injections spaced by 2 weeks. Long-term follow-up at 12 months and up to 24 months for 6 horses were carried out by means of telephonic interviews with the owner. Ten out of 12 branches presented resolution of the hypoechoic lesions within three months and the treatment was associated with rapid resolution of lameness. Six of the 9 horses returned to their previous workload, 2 were in a lower level and 1 was retired. Two to three intralesional injections with RegenPRP in SLBD contributes to a rapid resolution of lameness and ultrasonographic lesions without complications. This treatment should be considered to increase the number of horses reaching their previous level of performance. Clinical results confirm that the use of a standardized autologous leukocyte poor PRP represents a convenient alternative treatment for SLB lesions.

Low‐field MRI findings and follow‐up of central tarsal bone fractures in four non‐racehorses

SummaryBackgroundCentral tarsal bone fractures in non‐racehorses are uncommon and their MRI appearance and follow‐up have not been described.ObjectivesTo describe the clinical and MRI characteristics and follow‐up of central tarsal bone fractures in non‐racehorses.Study designRetrospective descriptive case series.MethodsThe low‐field MRI appearance of central tarsal bone fractures in sports horses identified over a 9‐year period, was reviewed. Follow‐up MRI examinations, treatment and clinical outcome were included.ResultsFour horses with five vertical fractures of the central tarsal bone were included. There were three Warmbloods, of which two were showjumpers and one a dressage horse, and one Quarter Horse used for western performance. All fractures could consistently be visualised on low‐field standing MRI and were associated with marked sclerosis in the surrounding bone, with little to no associated bone marrow lesion of the central tarsal bone. One horse had bilateral fractures. Three fractures were complete (full‐thickness) slab fractures and two were incomplete (partial‐thickness) slab fractures. Fractures occurred in a consistent dorsomedial to plantarolateral oblique orientation and were non‐displaced. Incomplete fractures occurred at the dorsomedial proximal aspect of the central tarsal bone. All horses were treated conservatively initially. The dressage horse with bilateral fractures and the Quarter Horse remained lame after conservative treatment and were subsequently treated surgically. Three horses returned to their previous level of performance, one horse in spite of persistent MRI evidence of a fracture line (non‐union), while the Quarter Horse returned to a lower level of reining.Main limitationsSmall number of horses.ConclusionsStanding low‐field MRI is helpful in the diagnosis of central tarsal bone fractures. Central tarsal bone fractures occur in a dorsomedial to plantarolateral orientation in sports horses, can be complete or incomplete, unilateral or bilateral and remain non‐displaced. The prognosis is good for return to performance.

Does maternity during sports career jeopardize future athletic success in elite marathon runners?

The impact of maternity (Mat) on subsequent athletic performance is not well known. This study aims to investigate the impact of maternity among elite marathoners on their overall performance progression. For each runner listed in the top 150 female marathoners, who had experienced a mid-career maternity, performance development was reconstituted throughout the career. Maternity data and career break time span (Ttotal) were collected from publicly available informations. Performances were modelled according to the known age-performance relationship and the impact of maternity was added into the model. Linear mixed effect model was used to study the influence of maternity on the overall career. Among this sample, thirty-seven runners had at least 1 child during her career. Among them, fourteen had two children. Eleven runners (29.72%) made their personal best performance before Mat, which occurred at an average age of 28.40 ± 4.00 years. Twenty-six runners (70.28%) establish their best performances after Mat, at an average age of 32.20 ± 4.28. The age-performance relationship model explains 92% of the performance variability during the career’s progression. When age is considered, maternity does not have significant impact on performance development. World’s most competitive marathoners can still perform at their best level after pregnancy. The ability to return and surpass previous performance level is influenced by the age at which pregnancy occurs, relative to the age of peak performance during career development.