BMC sports science, medicine & rehabilitation最新文献

{"title":"Prolonged cycling lowers subsequent running mechanical efficiency in collegiate triathletes.","authors":"J A Stewart,&nbsp;E K Merritt,&nbsp;D E Lidstone,&nbsp;J M McBride,&nbsp;K A Zwetsloot","doi":"10.1186/s13102-022-00543-w","DOIUrl":"https://doi.org/10.1186/s13102-022-00543-w","url":null,"abstract":"<p><strong>Background: </strong>A significant challenge that non-elite collegiate triathletes encounter during competition is the decline in running performance immediately after cycling. Therefore, the purpose of this study was to determine if performing a 40-km bout of cycling immediately before running would negatively influence running economy and mechanical efficiency of running during simulated race conditions in collegiate triathletes.</p><p><strong>Methods: </strong>Eight competitive club-level collegiate triathletes randomly performed two trials: cycling for 40 km (Cycle-Run) or running for 5 km (Run-Run), immediately followed by a four-minute running economy and mechanical efficiency of running test at race pace on an instrumented treadmill. Blood lactate, respiratory exchange ratio, mechanical work, energy expenditure, and muscle glycogen were also measured during the four-minute running test.</p><p><strong>Results: </strong>Mechanical efficiency of running, but not running economy, was significantly lower in Cycle-Run, compared to Run-Run (42.1 ± 2.5% vs. 48.1 ± 2.5%, respectively; p = 0.027). Anaerobic energy expenditure was significantly higher in the Cycle-Run trial, compared to the Run-Run trial (16.3 ± 2.4 vs. 7.6 ± 1.1 kJ; p = 0.004); while net (151.0 ± 12.3 vs. 136.6 ± 9.6 kJ; p = 0.204) and aerobic energy expenditure (134.7 ± 12.3 vs. 129.1 ± 10.5 kJ; p = 0.549) were not statistically different between trials. Analysis of blood lactate, respiratory exchange ratio, mechanical work, and changes in muscle glycogen revealed no statistically significant differences between trials.</p><p><strong>Conclusions: </strong>These results suggest that mechanical efficiency of running, but not running economy, is decreased and anaerobic energy expenditure is increased when a 40-km bout of cycling is performed immediately before running in collegiate triathletes.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"149"},"PeriodicalIF":1.9,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9344700/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40574526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Injury incidence and specific injury patterns in app-based bodyweight training (Freeletics): results of an international survey with 3668 participants.","authors":"G Hertel,&nbsp;A Hochrein,&nbsp;C Suren,&nbsp;P Minzlaff,&nbsp;I J Banke,&nbsp;J Willers,&nbsp;R von Eisenhart-Rothe,&nbsp;P M Prodinger","doi":"10.1186/s13102-022-00525-y","DOIUrl":"https://doi.org/10.1186/s13102-022-00525-y","url":null,"abstract":"<p><strong>Background: </strong>The aim of this study was to analyze incidences and sport-specific injury patterns among users of a bodyweight-based training method instructed by a smartphone app (Freeletics Bodyweight App).</p><p><strong>Methods: </strong>An online questionnaire based on current validated epidemiological observation methods was designed using the statistic website Surveymonkey. Subscribers of the Freeletics Bodyweight App were contacted via an online link. Injury incidence, defined as an event leading to a training pause of at least 1 day, was recorded. The type of injury was reported and classified. Furthermore, all participants were asked whether they recognized any positive or negative effects on their subjective health status. The collected data were analyzed using Surveymonkey statistic services.</p><p><strong>Results: </strong>A total of 4365 Freeletics users responded to the questionnaire, 3668 completed forms were subject of further investigation. The injury period prevalence reported by users of the Freeletics App was 24% in men and 21% in women. The most frequently reported site of injury was the shoulder (29%) and the knee joint (28%), with strains (28.5%) and other muscle injuries (14.4%) being the most frequently reported types of injuries. An injury incidence rate of 4.57 per 1000 h was calculated, with injuries occurring less frequently in experienced users. Most participants reported a distinct positive effect of the app-based training on their health status.</p><p><strong>Conclusion: </strong>In comparison to other sports activities app-based bodyweight training is associated with a comparably low injury period prevalence. The vast majority of injuries were reported to have resolved within one week.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"145"},"PeriodicalIF":1.9,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321304/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40627843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effectiveness of a golf injury prevention program (GRIPP intervention) compared to the usual warm-up in Dutch golfers: protocol design of a randomized controlled trial.","authors":"S Gladdines,&nbsp;A L von Gerhardt,&nbsp;E Verhagen,&nbsp;A Beumer,&nbsp;D Eygendaal","doi":"10.1186/s13102-022-00511-4","DOIUrl":"https://doi.org/10.1186/s13102-022-00511-4","url":null,"abstract":"<p><strong>Background: </strong>Sixty million golfers around the world play golf. Golf injuries are most frequently located in the spine, elbow, wrist, hand and shoulder. Those injuries are often seen in golfers with more playing hours and suboptimal swing biomechanics, resulting in overuse injuries. Golfers who do not perform a warm-up or do not warm-up appropriately are more likely to report an injury than those who do. There are several ways to warm-up. It is unclear, which warm-up is most useful for a golfer to perform. Moreover, there is currently no evidence for the effectiveness of a warm-up program for golf injury prevention. We previously have developed the Golf Related Injury Prevention Program (GRIPP) intervention using the Knowledge Transfer Scheme (KTS). We aim to evaluate the effect of the GRIPP intervention on golf-related injuries. The hypothesis is that the GRIPP intervention program will reduce the number of golf-related injuries.</p><p><strong>Methods and design: </strong>The GRIPP study is a two-armed randomized controlled trial. Twenty-eight golf clubs with 11 golfers per club will be randomly allocated to the intervention or control group. The intervention group will perform the GRIPP intervention program, and the control group will perform their warm-up as usual. The GRIPP intervention is conducted with the Knowledge Transfer Scheme framework, which is a systematic process to develop an intervention. The intervention consists of 6 exercises with a maximum total of 10 min. The primary outcome is the overall prevalence (%) of golf injuries measured with the Oslo Sports Trauma Research Center (OSTRC-H) questions on health problems every fortnight. The secondary outcome measures will be exposure to golf and compliance to the intervention program.</p><p><strong>Discussion: </strong>In other sports warm-up prevention programs are effective in reducing the risk of injuries. There are no randomized trials on golf injury prevention. Therefore, an individual unsupervised golf athlete intervention program is conducted which reflects the daily practice of predominantly unsupervised exposure of amateur golfers.</p><p><strong>Trial registration: </strong>The trial is retrospectively (28 October 2021) registered at the Dutch Trial Register: NL9847 ( https://trialsearch.who.int ).</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"144"},"PeriodicalIF":1.9,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9327285/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40541711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acute effects of a 60-min time trial on power-related parameters in trained endurance runners.","authors":"Antonio Cartón-Llorente,&nbsp;Luis E Roche-Seruendo,&nbsp;Elena Mainer-Pardos,&nbsp;Hadi Nobari,&nbsp;Alberto Rubio-Peirotén,&nbsp;Diego Jaén-Carrillo,&nbsp;Felipe García-Pinillos","doi":"10.1186/s13102-022-00538-7","DOIUrl":"https://doi.org/10.1186/s13102-022-00538-7","url":null,"abstract":"<p><strong>Background: </strong>The advent of power meters for running has raised the interest of athletes and coaches in new ways of assessing changes in running performance. The aim of this study is to determine the changes in power-related variables during and after a strenuous endurance running time trial.</p><p><strong>Methods: </strong>Twenty-one healthy male endurance runners, with a personal record of 37.2 ± 1.2 min in a 10-km race, completed a 1-h run on a motorized treadmill trying to cover as much distance as they could. Before and after the time trial the athletes were asked to perform a 3-min run at 12 km h^-1. Normalized mean power output, step frequency, form power and running effectiveness were calculated using the Stryd™ power meter. Heart rate (HR) and rating of perceived exertion (RPE) were monitored, and data averaged every 5 min.</p><p><strong>Results: </strong>Despite high levels of exhaustion were reached during the time trial (HRpeak = 176.5 ± 9.8 bpm; RPE = 19.2 ± 0.8), the repeated measures ANOVA resulted in no significant differences (p ≥ 0.05), between each pair of periods for any of the power-related variables. The pairwise comparison (T test) between the non-fatigued and fatigued constant 3-min runs showed an increase in step frequency (p = 0.012) and a decrease in form power (p < 0.001) under fatigue conditions, with no meaningful changes in normalized mean power output and running effectiveness.</p><p><strong>Conclusions: </strong>Trained athletes are able to maintain power output and running effectiveness during a high demanding extended run. However, they preferred to reduce the intensity of vertical impacts under fatigue conditions by increasing their step frequency.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"142"},"PeriodicalIF":1.9,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9310469/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40629011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristic MRI findings of the shoulder, elbow, and wrist joints in elite wheelchair basketball players.","authors":"Masafumi Sakai,&nbsp;Hirotaka Mutsuzaki,&nbsp;Yukiyo Shimizu,&nbsp;Yoshikazu Okamoto,&nbsp;Takahito Nakajima","doi":"10.1186/s13102-022-00528-9","DOIUrl":"https://doi.org/10.1186/s13102-022-00528-9","url":null,"abstract":"<p><strong>Background: </strong>The health of wheelchair users' upper limbs is directly related to their quality of life. Moreover, para-sport athletes are subjected to a dual load on their upper extremities from competition and daily life, making it even more critical to maintain upper extremity health. This study aimed to investigate the characteristics of joint disorders in elite wheelchair basketball players using magnetic resonance imaging (MRI).</p><p><strong>Methods: </strong>We scanned MRI images of the bilateral shoulders, elbows, and wrist joints of ten elite wheelchair basketball players and ten general wheelchair users. The elite wheelchair players were athletes who underwent at our institution medical checkup of the candidates for the national team for the international women's tournament and who agreed to this research purpose. The general wheelchair players were recruited from wheelchair users in their 20s and 30s who had no daily exercise habits and who agreed to the study objectives. Two radiologists interpreted the MRI images and diagnosed the diseases of each joint. We compared the number of lesions between the two groups. We used Fisher's exact test to determine whether the lesions diagnosed by MRI were specific to wheelchair basketball players. The significance threshold was set at P < 0.05.</p><p><strong>Results: </strong>Elite wheelchair basketball players had significantly more right-sided, left-sided and bilateral latero-posterior lesions, which are cysts found on the lateral-posterior corner of the capitulum of the humerus than did general wheelchair users (P < 0.05). Severe damage to the right triangular fibrocartilage complex was also observed more frequently (P < 0.05) in wheelchair basketball players.</p><p><strong>Conclusions: </strong>We believe that the patients' tendency to fall forward in the wheelchair hitting both hands on the ground, thereby injuring the triangular fibrocartilage complex and locking the lateral elbow, may be the cause of the characteristic findings on MRI. High-speed wheelchair operation was also considered a cause of severe triangular fibrocartilage complex injuries. This study's insights can be useful for future solutions to extend players' careers.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"141"},"PeriodicalIF":1.9,"publicationDate":"2022-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9308260/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40532970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Are active video games useful in the development of gross motor skills among non-typically developing children? A meta-analysis.","authors":"Sen Li,&nbsp;Yang Song,&nbsp;Zhidong Cai,&nbsp;Qingwen Zhang","doi":"10.1186/s13102-022-00532-z","DOIUrl":"https://doi.org/10.1186/s13102-022-00532-z","url":null,"abstract":"<p><strong>Background: </strong>Proficiency in gross motor skills (GMS) lays the foundation for developing more complex motor skills. Improving these motor skills may provide enhanced opportunities for the development of a variety of perceptual, social, and cognitive skills. However, GMS development and intervention effects are not ideal for many non-typically developing children.</p><p><strong>Objective: </strong>To systematically evaluate the effect of active video games on the development of gross motor skills in non-typically developing children and adolescents.</p><p><strong>Methods: </strong>Seven Chinese and English databases were searched for randomized controlled trials, and the risk of bias in included studies were qualitative evaluation according to the revised Cochrane risk of bias tool for randomised trials (RoB 2). Then a meta-analysis was conducted to estimate the overall effect of active video games on the development of gross motor skills in non-typically developing children.</p><p><strong>Results: </strong>Twenty papers were included. In the three subordinate concepts of gross motor skills, active video games significantly improved locomotor skills [ SMD = 0.59, 95% CI (0.40, 0.77)] and non-locomotor skills [SMD = 0.51, 95% CI (0.20, 0.81)] in non-typically developing children. However, there was no significant difference compared with the control group [ SMD = 0.32, 95% CI (- 0.17, 0.82)] in object control skills.</p><p><strong>Conclusions: </strong>The study shows that active video games can improve locomotor skill and stability skill in non-typically developing children, but the effect on object control skill is uncertain, and more high-quality literature needs to be included in the future. Trial registration The meta-analysis was registered on INPLASY (202,250,124) and is available in full on inplasy.com ( https://inplasy.com/inplasy-2022-5-0124/ ).</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"140"},"PeriodicalIF":1.9,"publicationDate":"2022-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9308223/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40533092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orthostatic intolerance as a potential contributor to prolonged fatigue and inconsistent performance in elite swimmers.","authors":"Lindsay S Petracek,&nbsp;Ella F Eastin,&nbsp;Ian R Rowe,&nbsp;Peter C Rowe","doi":"10.1186/s13102-022-00529-8","DOIUrl":"https://doi.org/10.1186/s13102-022-00529-8","url":null,"abstract":"<p><strong>Background: </strong>Athletic underperformance is characterized by fatigue and an inability to sustain a consistent exercise workload. We describe five elite swimmers with prolonged fatigue and athletic underperformance. Based on our work in myalgic encephalomyelitis /chronic fatigue syndrome, we focused on orthostatic intolerance as a possible contributor to symptoms.</p><p><strong>Methods: </strong>Participants were referred for evaluation of fatigue and underperformance to the Chronic Fatigue Clinic at the Johns Hopkins Children's Center. All patients were evaluated for overtraining syndrome, as well as for features commonly seen in myalgic encephalomyelitis/chronic fatigue syndrome. The latter included joint hypermobility, orthostatic intolerance, and non-IgE mediated milk protein intolerance. Orthostatic intolerance was tested by performing a ten-minute passive standing test or a head-up tilt table test.</p><p><strong>Results: </strong>Orthostatic testing provoked fatigue and other symptoms in all five swimmers, two of whom met heart rate criteria for postural tachycardia syndrome. Treatment was individualized, primarily consisting of an increased intake of sodium chloride and fluids to address orthostasis. All patients experienced a relatively prompt improvement in fatigue and other orthostatic symptoms and were able to either return to their expected level of performance or improve their practice consistency.</p><p><strong>Conclusions: </strong>Orthostatic intolerance was an easily measured and treatable contributor to athletic underperformance in the five elite swimmers we describe. We suggest that passive standing tests or formal tilt table tests be incorporated into the clinical evaluation of athletes with fatigue and underperformance as well as into scientific studies of this topic. Recognition and treatment of orthostatic intolerance provides a new avenue for improving outcomes in underperforming athletes.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"139"},"PeriodicalIF":1.9,"publicationDate":"2022-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9308026/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40619356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A preliminary study on the feasibility of community game-based respiratory muscle training for individuals with high cervical spinal cord injury levels: a novel approach.","authors":"Dongheon Kang,&nbsp;Jiyoung Park,&nbsp;Seon-Deok Eun","doi":"10.1186/s13102-022-00534-x","DOIUrl":"https://doi.org/10.1186/s13102-022-00534-x","url":null,"abstract":"<p><strong>Background: </strong>Respiratory disorders result in rehospitalization and premature death of patients with cervical spinal cord injuries (CSCI). Community game-based respiratory muscle training (RMT) programs could reduce secondary complications.</p><p><strong>Methods: </strong>We examined the feasibility and preliminary efficacy of RMT as a community-based exercise program. Among the 10 included participants (eight male and two female), four, one, one, and four reported C3, C4, C5, and C6 complete injuries, respectively (eight graded by American Spinal Injury Association impairment scale [ASIA] A and two by ASIA B). Their mean age was 43 ± 12.3 y. The time since injury was 10 ± 6.7 y. The participants completed an RMT program for 60 min/day, twice weekly, for 8 weeks. The participants were trained in the use of a newly developed game-based RMT device. The device provides consistent pressure for respiratory muscle strength and endurance training. Seven RMT devices were modified to allow 10 game-based RMT programs. Forced vital capacity (FVC), forced expiratory volume in 1 s (FEV₁), peak expiratory flow (PEF), vital capacity (VC), inspiratory capacity (IC), inspiratory reserve volume (IRV), expiratory reserve volume (ERV), maximum inspiratory pressure (MIP), maximum expiratory pressure (MEP), and peak cough flow (PCF) were measured.</p><p><strong>Results: </strong>There were improvements after RMT compared to pre-RMT in FVC (p = 0.027, 10.62%, 0.22 effect size [ES]), PEF (p = 0.006, 23.21%, 0.45 ES), VC (p = 0.002, 35.52%, 0.60 ES), IC (p = 0.001, 46.94%, 0.81 ES), IRV (p = 0.001, 90.53%, 1.22 ES), MIP (p = 0.002, 97.25%, 1.32 ES), MEP (p = 0.005, 141.12%, 1.07 ES), and PCF (p = 0.001, 35.60%, 0.74 ES). The participants reported a positive impact of the program.</p><p><strong>Conclusions: </strong>Community game-based RMT for individuals with CSCI appears to be safe and feasible. Community exercise with RMT use may have a positive impact on the respiratory measures for patients with CSCI who are vulnerable to respiratory compromise.</p><p><strong>Trial registration: </strong>KCT0005980.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"137"},"PeriodicalIF":1.9,"publicationDate":"2022-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9306039/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40616918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pre-operative knee extensor and flexor torque after secondary ACL rupture: a comparative retrospective analysis.","authors":"Marlene Mauch,&nbsp;Ramona Ritzmann,&nbsp;Christophe Lambert,&nbsp;Markus Wenning,&nbsp;Clara Ebner,&nbsp;Leonie Hartl,&nbsp;Albrecht H Heitner,&nbsp;Jochen Paul,&nbsp;Christoph Centner","doi":"10.1186/s13102-022-00531-0","DOIUrl":"https://doi.org/10.1186/s13102-022-00531-0","url":null,"abstract":"<p><strong>Background: </strong>Secondary anterior cruciate ligament (ACL) ruptures are a relevant clinical concern after surgical treatment of a primary ACL rupture. However, there is a lack of scientific evidence related to the role of muscle strength prior to revision surgery in a second ACL rupture. The aim of this study was to assess differences in knee extensor and flexor strength in patients before primary and secondary ACL reconstruction compared to healthy controls.</p><p><strong>Methods: </strong>In total, n = 69 age, weight and sex matched individuals were included in the study: n = 23 patients with isolated primary ACL rupture, n = 23 with secondary ACL rupture, and n = 23 matched healthy controls. Maximal isokinetic knee extension and flexion torque normalized to body mass was assessed for both legs.</p><p><strong>Results: </strong>For patients with secondary ACL ruptures, torques were reduced in the non-injured (extension: 1.94 Nm/kg vs. 2.46 Nm/kg, p < 0.05, flexion: 1.25 Nm/kg vs. 1.59 Nm/kg, p < 0.05) and the injured leg (extension: 1.70 Nm/kg vs. 2.46 Nm/kg, p < 0.05, flexion: 1.14 Nm/kg vs. 1.59 Nm/kg, p < 0.05) compared to healthy controls. For patients with a primary ACL rupture torques were reduced in the non-injured (extension: 1.92 Nm/kg vs. 2.46 Nm/kg, p < 0.05, flexion: 1.24 Nm/kg vs. 1.59 Nm/kg, p < 0.05) and the injured leg (extension: 1.38 Nm/kg vs. 2.46 Nm/kg, p < 0.05, flexion: 1.01 Nm/kg vs. 1.59 Nm/kg, p < 0.05) compared to healthy controls. There were no differences between patients with primary and secondary ruptures, except of the knee extension on the injured leg showing higher values after a secondary ACL rupture (1.38 Nm/kg vs. 1.70 Nm/kg, p < 0.05).</p><p><strong>Conclusions: </strong>The findings indicate that maximal knee torques were significantly reduced in patients with primary and secondary ACL ruptures before surgical reconstruction for the non-injured and injured leg as compared to healthy controls. Further investigations are needed to assess strength abilities before and after a second revision within a prospective design.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"135"},"PeriodicalIF":1.9,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9295510/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40607386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cardiopulmonary exercise testing and impedance cardiography in the assessment of exercise capacity of patients with coronary artery disease early after myocardial revascularization.","authors":"Małgorzata Kurpaska,&nbsp;Paweł Krzesiński,&nbsp;Grzegorz Gielerak,&nbsp;Karina Gołębiewska,&nbsp;Katarzyna Piotrowicz","doi":"10.1186/s13102-022-00527-w","DOIUrl":"https://doi.org/10.1186/s13102-022-00527-w","url":null,"abstract":"<p><strong>Background: </strong>Patients with coronary artery disease (CAD) are characterized by different levels of physical capacity, which depends not only on the anatomical advancement of atherosclerosis, but also on the individual cardiovascular hemodynamic response to exercise. The aim of this study was evaluating the relationship between parameters of exercise capacity assessed via cardiopulmonary exercise testing (CPET) and impedance cardiography (ICG) hemodynamics in patients with CAD.</p><p><strong>Methods: </strong>Exercise capacity was assessed in 54 patients with CAD (41 men, aged 59.5 ± 8.6 years) within 6 weeks after revascularization by means of oxygen uptake (VO₂), assessed via CPET, and hemodynamic parameters [heart rate (HR), stroke volume, cardiac output (CO), left cardiac work index (LCWi)], measured by ICG. Correlations between these parameters at anaerobic threshold (AT) and at the peak of exercise as well as their changes (Δpeak-rest, Δpeak-AT) were evaluated.</p><p><strong>Results: </strong>A large proportion of patients exhibited reduced exercise capacity, with 63% not reaching 80% of predicted peak VO₂. Clinically relevant correlations were noted between the absolute peak values of VO₂ versus HR, VO₂ versus CO, and VO₂ versus LCWi (R = 0.45, p = 0.0005; R = 0.33, p = 0.015; and R = 0.40, p = 0.003, respectively). There was no correlation between AT VO₂ and hemodynamic parameters at the AT time point. Furthermore ΔVO₂ (peak-AT) correlated with ΔHR (peak-AT), ΔCO (peak-AT) and ΔLCWi (peak-AT) (R = 0.52, p < 0.0001, R = 0.49, p = 0.0001; and R = 0.49, p = 0.0001, respectively). ΔVO₂ (peak-rest) correlated with ΔHR (peak-rest), ΔCO (peak-rest), and ΔLCWi (peak-rest) (R = 0.47, p < 0.0001; R = 0.41, p = 0.002; and R = 0.43, p = 0.001, respectively).</p><p><strong>Conclusion: </strong>ICG is a reliable method of assessing the cardiovascular response to exercise in patients with CAD. Some ICG parameters show definite correlations with parameters of cardiovascular capacity of proven clinical utility, such as peak VO₂.</p>","PeriodicalId":520573,"journal":{"name":"BMC sports science, medicine & rehabilitation","volume":" ","pages":"134"},"PeriodicalIF":1.9,"publicationDate":"2022-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9288716/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40511674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}