Publications by authors named "Vermeulen Stefan"

Article Synopsis
  • The study focuses on improving the quantification of phages for personalized therapy and industrial use, highlighting that the traditional culture-based method is accurate but time-consuming.
  • A DNase treatment before using quantitative polymerase chain reaction (qPCR) is proposed to enhance the accuracy of phage quantification, though qPCR still tends to overestimate compared to the gold standard method.
  • Findings indicate that the differences in phage quantification methods vary based on the age of the phage stocks, and electron microscopy confirmed the presence of free DNA influencing the results.
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De Bleecker, C, Vermeulen, S, Willems, T, Segers, V, Spanhove, V, Leys, R, Vanrenterghem, J, and De Ridder, R. Validation of impact forces estimated by wearable device VERT in volleyball validation impact forces VERT. J Strength Cond Res XX(X): 000-000, 2024-As volleyball players are exposed to high volumes of forceful jump-landing actions, the risk of injuries is increased.

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Short-term fatigue protocols simulating sports participation are scarce and not well-documented in jump-landing sports. Therefore, this study investigated physiological and physical responses following high-intensity, intermittent exercise protocols (HIIPs) with a standardized level of subjective exhaustion (Borg ≥18/20) and a modified fixed version of five circuits (HIIP-5) for future inclusion in biomechanical screening protocols. Twenty male volleyball and basketball players participated in this study to complete the HIIP and the HIIP-5.

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Background: Biomechanical evaluations of sport-specific jump-landing tasks may provide a more ecologically valid interpretation compared to generic jump-landing tasks. For accurate interpretation of longitudinal research, it is essential to understand the reliability of biomechanical parameters of sport-specific jump-landing tasks.

Research Question: How reliable are hip, knee and ankle joint angles and moment curves during two volleyball-specific jump-landing tasks and is this comparable with the reliability of a generic jump-landing task?

Methods: Three-dimensional (3D) biomechanical analyses of 27 male volleyball players were performed in two sessions separated by one week.

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Some psychiatric patients have exhausted all approved treatment options. Numerous investigational drugs are currently being developed and tested in clinical trials. However, not all patients can participate in clinical trials.

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Article Synopsis
  • Patellar tendinopathy (PT) is a common injury among volleyball players, potentially exacerbated by overload during intense jumping activities, but its link to fatigue while spiking is unclear.
  • A study with 43 male volleyball players measured how fatigue from a high-intensity jumping protocol impacted patellar tendon loading and movement mechanics before and after exercise.
  • Results showed that fatigue led to a stiffer landing strategy and reduced forces on the patellar tendon, suggesting players may adapt their movements to protect against injury when tired, which could increase the risk of developing PT if those protective adaptations fail after intense play.
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Drawing on ethical and legal frameworks in the Netherlands, the United States and France, we examine whether physicians are expected to inform patients about potentially relevant opportunities for expanded access to investigational drugs. While we found no definitive legal obligation, we argue that physicians have a moral obligation to discuss opportunities for expanded access with patients who have run out of treatment options to prevent inequality, to promote autonomy, and to achieve beneficence.

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Fatigue has often been considered a risk factor for developing sports injuries, modulating lower extremity jump-landing biomechanics. The impact of fatigue on proximal trunk and pelvic biomechanics has been suggested to play an important role in lower extremity loading and injury risk, yet the available evidence remains ambiguous as the trunk and pelvis were often not the primary focus of research. Therefore, the purpose of this systematic review was to determine how fatigue affects trunk and pelvic three-dimensional jump-landing biomechanics.

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When seriously ill patients reach the end of the standard treatment trajectory for their condition, they may qualify for the use of unapproved, investigational drugs regulated via expanded access programs. In medical-ethical discourse, it is often argued that expanded access to investigational drugs raises 'false hope' among patients and is therefore undesirable. We set out to investigate what is meant by the false hope argument in this discourse.

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Objectives: To develop a clinical tool to evaluate unilateral landing quality in a healthy population. The reliability of the novel tool was evaluated, and the influence of gender and leg-dominance was investigated.

Design: An experimental study for developing a test protocol, scoring criteria, and scoring method, based on observable landing errors, for the novel Unilateral Landing Error Scoring System (ULESS).

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In Belgium, the incorporation of phages into magistral preparations for human application has been permitted since 2018. The stability of such preparations is of high importance to guarantee quality and efficacy throughout treatments. We evaluated the ability to preserve infectivity of four different phages active against three different bacterial species in five different buffer and infusion solutions commonly used in medicine and biotechnological manufacturing processes, at two different concentrations (9 and 7 log pfu/mL), stored at 4 °C.

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Bacteriophages are a promising therapeutic strategy among cystic fibrosis and lung-transplanted patients, considering the high frequency of colonization/infection caused by pandrug-resistant bacteria. However, little clinical data are available regarding the use of phages for infections with . A 12-year-old lung-transplanted cystic fibrosis patient received two rounds of phage therapy because of persistent lung infection with pandrug-resistant .

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Objectives: Stability of the core is associated with lower extremity functioning. Consequently, impaired core stability might play a role in developing non-contact acute lower extremity sports injuries. The objective was to investigate components of core stability as potential risk factors for acute lower extremity injuries.

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Objective: Ankle-foot problems have a considerable impact on daily functioning in patients with hypermobile Ehlers-Danlos syndrome and hypermobility spectrum disorder (hEDS/HSD). Therefore, the objective of this study was to identify alterations in multisegment ankle and foot kinematics during gait and to assess foot function and pain in these patients.

Methods: Twenty-three women with hEDS/HSD and 23 healthy controls participated in this 3-dimensional gait analysis.

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Background: Lower extremity overuse injuries are common in athletes participating in sports with repeated bouts of landing manoeuvres. Biomechanical alterations during landing may be associated with these types of injuries. The objective of this systematic review with meta-analysis was to summarise and determine the relationship between kinematic alterations during a landing task and the development of lower extremity overuse injuries in physically active populations.

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RNA quality and quantity are important factors for ensuring the accuracy of gene expression analysis and other RNA-based downstream applications. Thus far, only a limited number of methodological studies have compared sample storage and RNA extraction procedures for human cells. We compared three commercially available RNA extraction kits, i.

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To determine phage titers accurately, reproducibly and in a non-laborious and cost-effective manner, we describe the development of a qPCR platform for molecular quantification of five phages present in bacteriophage cocktail 2 (BFC2). We compared the performance of this molecular approach, with regard to quantification and reproducibility, with the standard culture-based double agar overlay method (DAO). We demonstrated that quantification of each of the five phages in BFC2 was possible by means of qPCR, without prior DNA extraction, but yields were significantly higher in comparison to DAO.

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Primary hyperparathyroidism (PHPT) is probably the most common endocrine disorder of the parathyroid glands, causing hypercalcemia. It is diagnosed often in persons with elevated serum calcium levels. However, hematological manifestations, such as thrombocytopenia are less known.

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In order to identify current trends in anaerobic bacteraemia, a 10-year retrospective study was performed in the University Hospital Brussel, Belgium. All clinically relevant bacteraemia detected from 2004 until 2013 were included. Medical records were reviewed in an attempt to define clinical parameters that might be associated with the occurrence of anaerobic bacteraemia.

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Background: Bioluminescent cancer models are widely used but detailed quantification of the luciferase signal and functional comparison with a non-transfected control cell line are generally lacking. In the present study, we provide quantitative and functional tests for luciferase-transfected cells.

Materials And Methods: We quantified the luciferase expression in BLM and HCT8/E11 transfected cancer cells, and examined the effect of long-term luciferin exposure.

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Radiotherapy is a mainstay in the postoperative treatment of breast cancer as it reduces the risks of local recurrence and mortality after both conservative surgery and mastectomy. Despite recent efforts to decrease irradiation volumes through accelerated partial irradiation techniques, late cardiac and pulmonary toxicity still occurs after breast irradiation. The importance of this pulmonary injury towards lung metastasis is unclear.

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Aim: Candida species are known as opportunistic pathogens, and a possible cause of invasive infections. Because of their species-specific antimycotic resistance patterns, reliable techniques for their detection, quantification and identification are needed. We validated a DNA amplification method for direct detection of Candida spp.

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Background: The aim of this study was to optimize quantitative (real-time) polymerase chain reaction (qPCR) assays for 8 major periodontal pathogens, i.e. Aggregatibacter actinomycetemcomitans, Fusobacterium nucleatum, Parvimonas micros, Porphyromonas gingivalis, Prevotella intermedia, Tanerella forsythia and Treponema denticola, and of the caries pathogen Streptococcus mutans.

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