F. Backx

F. Backx
University Medical Center Utrecht | UMC Utrecht · Department of Rehabilitation, Physical therapy science and Sports

prof; MD PhD FESMA

About

275
Publications
140,503
Reads
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6,132
Citations
Citations since 2017
60 Research Items
4012 Citations
20172018201920202021202220230200400600
20172018201920202021202220230200400600
20172018201920202021202220230200400600
20172018201920202021202220230200400600
Additional affiliations
January 2007 - present
University Medical Center Utrecht
Position
  • Professor in Clinical Sports Medicine
February 2002 - January 2007
Utrecht University
Position
  • Sports medicine specialist and director of the University Center of Sports medicine (UCS; being a cooperation of the KNVB and UMC Utrecht))
June 1982 - June 1991
Utrecht University
Position
  • Researcher
Description
  • Part-time working on my thesis. 14-5-1991: Defense of the thesis Sports injuries in youth; etiology and prevention (promotor prof.dr. WL Mosterd and prof.dr.Collette)

Publications

Publications (275)
Article
Full-text available
Background Extracorporeal shockwave therapy (ESWT) is used commonly to treat pain and function in Achilles tendinopathy (AT). The aim of this study was to synthesize the evidence from (non-) randomized controlled trials, to determine the clinical effectiveness of ESWT for mid-portion Achilles tendinopathy (mid-AT) and insertional Achilles tendinopa...
Article
Full-text available
Introduction Mid-portion Achilles tendinopathy (mid-AT) is currently the preferred term for persistent Achilles tendon pain, defined as located 2–7 cm proximal to the calcaneus, and with loss of function related to mechanical loading. Histologically, mid-AT is considered to represent a degenerative condition. Therefore, monitoring of tendon structu...
Article
Full-text available
Objectives Adherence to injury prevention programmes in football remains low, which is thought to drastically reduce the effects of injury prevention programmes. Reasons why (medical) staff and players implement injury prevention programmes, have been investigated, but player’s characteristics and perceptions about these programmes might influence...
Article
Full-text available
Purpose. Ultrasound tissue characterization (UTC) is used to visualize and quantify the Achilles tendon structure. We investigated the intra-rater and inter-rater reliability of UTC for quantifying the midportion tendon structure and the area of maximum degeneration (AoMD) in military personnel with midportion Achilles tendinopathy. Method. UTC sca...
Article
PurposeThe purpose of this study was to explore what extent male amateur soccer players participate in off-field activities and whether these off-field activities are associated with the development of hamstring injuries.Methods Amateur soccer players (n = 399) from first-class selection teams (n = 32) filled out a baseline screening questionnaire...
Conference Paper
Background Hamstring injury incidence remains high among male soccer players. One of the reasons is low adherence for effective hamstring injury prevention programs. Insight in injury risk can contribute to better adherence for injury prevention measures. The hamstring outcome score (HaOS) might provide an insight in injury risk. Objective To dete...
Article
Full-text available
Background: The purpose of this study was to analyze factors associated with physical activity (PA) and to identify perceived barriers and benefits of PA among patients with hypothyroidism on thyroid hormone therapy. Methods: This survey-based cross-sectional study was conducted among members of the Dutch thyroid patient organization. Self-repor...
Article
Full-text available
Background Alfredson isolated eccentric loading and Silbernagel concentric–eccentric loading have both shown beneficial effects on clinical symptoms in midportion Achilles tendinopathy (AT), but they have never been compared directly. Purpose To test for differences in clinical effects at 1-year follow-up between Alfredson and Silbernagel loading...
Article
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Objectives Although muscle flexibility is considered to be a risk factor for hamstring and lower back injuries (HLB-injuries) in male soccer players, it is unclear whether this is true for elite female soccer players. Design Prospective observational cohort study. Method 114 elite female soccer players were monitored during the 2014-2015 soccer s...
Article
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Awareness of physical activity (PA) constraints in patients with primary hypothyroidism on thyroid hormone replacement therapy (THR) is important. Hence, this cross-sectional matched case-control study aimed to determine PA and sports participation (SP) in patients with hypothyroidism on THR in comparison to control subjects. Accordingly, survey qu...
Article
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Background: This study investigated whether a supervised exercise programme improves quality of life (QoL), fatigue and cardiorespiratory fitness in patients in the first year after oesophagectomy. Methods: The multicentre PERFECT trial randomly assigned patients to an exercise intervention (EX) or usual care (UC) group. EX patients participated...
Article
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Background Studies on the benefits of lower extremity compression garments (CGs) have focused on their effects on post-exercise recovery and performance improvement. Less is known about why athletes actually use CGs, the frequency with which they use them, and perceived benefits from using CGs. The purpose of this study was to investigate which ath...
Article
Full-text available
Objectives Hamstring injuries are common among soccer players. The hamstring outcome score (HaOS) might be useful to identify amateur players at risk of hamstring injury. Therefore the aims of this study were: To determine the association between the HaOS and prior and new hamstring injuries in amateur soccer players, and to determine the prognosti...
Article
Full-text available
Background Antipsychotic-induced Weight Gain (AiWG) is a debilitating and common adverse effect of antipsychotics. AiWG negatively impacts life expectancy, quality of life, treatment adherence, likelihood of developing type-2 diabetes and readmission. Treatment of AiWG is currently challenging, and there is no consensus on the optimal management st...
Article
Objective: To explore associations between physical activity and peak oxygen uptake (VO2peak), age, sex, and Hoffer classification in young wheelchair-users with spina bifida. Design: Exploratory study. Subjects: Dutch children (age 5-19 years) with spina bifida who use a manual wheelchair. Methods: For the dependent variable physical activi...
Article
ABSTRACT Chronic exertional compartment syndrome (CECS) is one of the recalcitrant overuse injuries of the legs. CECS is traditionally diagnosed with an intracompartmental pressure measurement (ICPM). The primary objective of this article was to report the relationship between exertional compartment pain and intracompartmental pressure in young ser...
Article
Full-text available
Objective: Despite the common occurrence of lower levels of physical activity and physical fitness in youth with spina bifida (SB) who use a wheelchair, there are very few tests available to measure and assess these levels. The purpose of this study was to determine reliability and the physiologic response of the 6-minute push test (6MPT) in youth...
Article
Full-text available
Background Having a physically active lifestyle after cancer diagnosis is beneficial for health, and this needs to be continued into survivorship to optimize long-term benefits. We found that patients, who participated in an 18-week exercise intervention, reported significant higher physical activity (PA) levels 4 years after participation in a ran...
Article
Full-text available
Background: Although sports participation leads to important health enhancement for youth with chronic diseases or physical disabilities (CDPD), it may pose an increased risk for injury or illness. This study investigated the incidence, type, severity and risks to (sports-related) injuries and illnesses among ambulatory youth with CDPD. Methods:...
Article
Background: Plyometric training is a specific form of strength training that is used to improve the physical performance of athletes. An overview of the effects of plyometric training on soccer-specific outcomes in adult male soccer players is not available yet. Purpose: To systematically review and meta-analyze the effects of plyometric trainin...
Article
Objective: To investigate which preventive measures runners use when preparing for a half- or full-marathon and whether the use of these measures at baseline and during the preparation-period differs between runners who sustained no/non-substantial running-related injuries (NSIRs) or substantial running-related injuries (SIRs). Design: Prospecti...
Preprint
Background: Although sports participation leads to important health enhancement for youth with chronic diseases or physical disabilities (CDPD), it may pose an increased risk for injury or illness. This study investigated the incidence, type, severity and risks to (sports-related) injuries and illnesses among ambulatory youth with CDPD. Methods: Ov...
Preprint
Full-text available
Background: Although sports participation leads to important health enhancement for youth with chronic diseases or physical disabilities (CDPD), it may pose an increased risk for injury or illness. This study investigated the incidence, type, severity and risks to (sports-related) injuries and illnesses among ambulatory youth with CDPD. Methods: Ov...
Preprint
Full-text available
Background: Although sports participation leads to important health enhancement for youth with chronic diseases or physical disabilities (CDPD), it may pose an increased risk for injury or illness. This study investigated the incidence, type, severity and risks to (sports-related) injuries and illnesses among youth with CDPD. Methods: For one calen...
Article
Objective: To describe the incidence, prevalence, and impact of running-related injuries (RRIs) and illness symptoms in half marathon and marathon runners during the 16-week period before the Utrecht Marathon. Methods: In this prospective cohort study, we used the Oslo Sports Trauma Research Center questionnaire to register RRIs and illness symp...
Article
De sportarts, een nieuwkomer in het veld van medisch specialisten, is er niet alleen voor sporters, maar ook voor de begeleiding van lichamelijk inactieve patiënten door middel van tests, voorlichting en beweegadviezen. Sinds 2016 wordt deze zorg vergoed in het basispakket.
Article
Full-text available
Background Although the Nordic Hamstring Exercise (NHE) prevents hamstring injury in soccer players effectively, the annual incidence of these injuries still increases. This may be because of poor long‐term compliance with the program. Furthermore, the timing and amplitude of gluteal and core muscle activation seem to play an important role in hams...
Article
Full-text available
Objectives To assess the outcome of conservative treatment for chronic exertional compartment syndrome (CECS) as it relates to the reduction in surgical fasciotomy and return to active duty in a military population. Methods Historic cohort. From 2015 to 2018, 75 surgically eligible patients with pressure-positive anterior CECS (Group 1), or with p...
Article
Full-text available
Lankhorst, K, Takken, T, Zwinkels, M, van Gaalen, L, Velde, St, Backx, F, Verschuren, O, Wittink, H, and de Groot, J. Sports participation, physical activity, and health-related fitness in youth with chronic diseases or physical disabilities: the health in adapted youth sports study. J Strength Cond Res XX(X): 000-000, 2019-Youth with chronic disea...
Article
Full-text available
Introduction: The aim of this study was to objectively assess time spent in physical activity (PA) and sedentary behavior (SB) in patients with schizophrenia compared to healthy controls matched for age, gender and socioeconomic status. Associations between both PA and cardiorespiratory fitness (CRF) and mental and physical health parameters in pat...
Article
Full-text available
Background Even though typically developing youth are already at risk for physical inactivity, youth with spina bifida may be even at higher risk as a consequence of their reduced mobility. No objective data is available for youth with spina bifida who use a manual wheelchair, so the seriousness of the problem is unknown. The purpose of this observ...
Article
Objectives: To investigate adherence to a Nordic hamstring exercise (NHE) program in a real-world context of male amateur football, and the perceptions of end users (players) and intervention deliverers (coaches and medical staff) about adherence to this proven effective program. Design: Retrospective cohort study. Setting: Dutch amateur footb...
Article
Full-text available
Purpose: To investigate the effects of high-intensity interval training (HIT) on physical fitness and cardiometabolic health in youth with physical disabilities. Methods: For this quasi-experimental study 70 participants were recruited from schools for special education and divided into runners and users of wheelchairs. HIT was performed for 8 w...
Article
Objectives: To investigate the prognosis and possible prognostic factors of running-related injuries (RRIs) in novice runners. Design: Prospective cohort study. Methods: Participants of Start to Run, a 6-weeks course for novice runners in The Netherlands, were asked to participate in this study. Before the start of the course a baseline questi...
Article
Full-text available
Background: Running is increasingly popular, but also carries a high injury risk, especially in novice runners. This study investigates differences in incidence and characteristics of running-related injuries (RRIs) between novice and experienced runners in the open population, in order to adapt to more specific needs for future prevention programs...
Article
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This study examined the criterion validity of self-reported running-related injuries (RRI) by novice runners. Fifty-eight participants (41 females; age 46 ± 11 yrs) of the “Start-to-Run” program provided self-reports on their RRIs using an online questionnaire. Subsequently, they attended injury consultations with sports medicine physicians who pro...
Article
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Background: The objective of this study was to derive evidence-based physical activity guidelines for the general Dutch population. Methods: Two systematic reviews were conducted of English language meta-analyses in PubMed summarizing separately randomized controlled trials and prospective cohort studies on the relation between physical activity...
Article
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Objectives: To determine the proportion of participants of a running program for novice runners that discontinued running and investigate the main reasons to discontinue and characteristics associated with discontinuation. Design: Prospective cohort study. Methods: The study included 774 participants of Start to Run, a 6-week running program f...
Article
Full-text available
Background Midportion Achilles tendinopathy (AT) can cause long-term absence from sports participation, and shows high recurrence rates. It is important that the decision to return to sport (RTS) is made carefully, based on sharply delimited criteria. Lack of a well-defined definition and criteria hampers the decision to RTS among athletes with AT,...
Article
Full-text available
Background: Testing aerobic fitness in youth is important because of expected relationships with health. Objective: The purpose of the study was to estimate the validity and reliability of the Shuttle Ride Test in youth who have spina bifida and use a wheelchair for mobility and sport. Design: Ths study is a validity and reliability study. Me...
Article
Full-text available
Background Hamstring injuries are the most common muscle injury in amateur and professional soccer. Most hamstring injuries occur in the late swing phase, when the hamstring undergoes a stretch-shortening cycle and the hamstring does a significant amount of eccentric work. The incidence of these injuries has not decreased despite there being effect...
Article
Full-text available
Background Acute lateral ankle sprains are the single most often diagnosed injury in female soccer players and often result in an inability to play. This highlights the need for effective prevention strategies. Proprioceptive training and/or the use of an external support to decrease inversion of the ankle joint can prevent or reduce the number of...
Article
Full-text available
Background Midportion Achilles tendinopathy (AT) is a common overuse injury, usually requiring several months of rehabilitation. Exercise therapy of the ankle plantar flexors (i.e. tendon loading) is considered crucial during conservative rehabilitation. Alfredson’s isolated eccentric and Silbernagel’s combined concentric-eccentric exercise program...
Article
Full-text available
Background The evidence on the associations of cardiorespiratory fitness, body adiposity and sports participation with arterial stiffness in children and adolescents with chronic diseases or physical disabilities is limited. Methods Altogether 140 children and adolescents with chronic diseases or physical disabilities participated in this cross-se...
Article
Objective To provide an evidence-based overview of the effectiveness of e-coaching as a cardiac rehabilitation program (CRP). Methods Pubmed, Embase, PEDro and CINAHL were searched to identify relevant RCTs. The e-coaching programs were divided into basic or complex depending on their content. Two reviewers independently assessed the methodologica...
Article
Full-text available
There are three major questions about return to play (RTP) after hamstring injuries: How should RTP be defined? Which medical criteria should support the RTP decision? And who should make the RTP decision? The study aimed to provide a clear RTP definition and medical criteria for RTP and to clarify RTP consultation and responsibilities after hamstr...
Article
Full-text available
There is evidence for a beneficial effect of aerobic exercise on cognition, but underlying mechanisms are unclear. In this study, we test the hypothesis that aerobic exercise increases cerebral blood flow (CBF) in patients with vascular cognitive impairment (VCI). This study is a multicenter single-blind randomized controlled trial among 80 patient...
Article
Full-text available
There is evidence for a beneficial effect of aerobic exercise on cognition, but underlying mechanisms are unclear. In this study, we test the hypothesis that aerobic exercise increases cerebral blood flow (CBF) in patients with vascular cognitive impairment (VCI). This study is a multicenter single-blind randomized controlled trial among 80 patient...
Article
Full-text available
In the past people with Multiple Sclerosis (MS) were advised to avoid exercise and sports in fear of excessive fatigue and increase of impairments. In recent years different studies reported positive effects of exercising on MS. In scientific publications and in the opinion of healthcare professionals the effect of sports on MS is not very clear. T...
Article
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Background: Although it has been suggested that generalized joint hypermobility (GJH) is a risk factor for injury in soccer players, it remains unclear whether this applies to elite female soccer players. Purpose: To investigate whether GJH is a risk factor for injury in elite female soccer players. Study design: Cohort study; Level of evidenc...
Article
Full-text available
Background: Psychological distress caused by cardiovascular pre-participation screening (PPS) may be a reason not to implement a PPS program. We assessed the psychological impact of PPS, including cardiac computed tomography (CT), in 318 asymptomatic sportsmen aged ≥45 years. Methods: Coronary artery disease (CAD) was defined as a coronary arter...
Article
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Background: There is no valid and reliable instrument that evaluates injury severity and treatment effects for medial tibial stress syndrome (MTSS) patients. Objective: The aim was to generate items for the MTSS score, a new patient-reported outcome measure for patients with MTSS. Methods: The authors consulted experts in the field of MTSS to gener...
Article
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Objectives: To determine content validity of the Muscle Power Sprint Test (MPST), and construct validity and reliability of the MPST, 10×5 Meter Sprint Test (10×5MST), slalom test, and One Stroke Push Test (1SPT) in wheelchair-using youth with spina bifida (SB). Design: Clinimetric study. Setting: Rehabilitation centers, SB outpatient services...
Article
Objective: Investigating differences in hip muscle strength between athletes with Achilles tendinopathy (AT) and asymptomatic controls. Design: Cross-sectional case-control study. Setting: Sports medical center. Participants: Twelve recreational male athletes with mid-portion AT and twelve matched asymptomatic controls. Outcome measures: I...
Article
Full-text available
Background: In soccer, although hamstring flexibility is thought to play a major role in preventing hamstring injuries, the relationship between hamstring flexibility and hamstring injuries remains unclear. Purpose: To investigate the relationship between hamstring flexibility and hamstring injuries in male amateur soccer players. Study design:...
Article
Background Acute lateral ankle ligamentous sprains (ALALS) are common injuries. This injury does not always have a favourable long-term outcome. Studies reporting the prognosis of ALALS after functional treatment are scarce. Objective To determine the prognosis of functionally treated ALALS, in terms of recurrent ALALS and residual symptoms. Stud...
Article
Full-text available
Background More than half of the recurrent hamstring injuries occur within the first month after return-to-play (RTP). Although there are numerous studies on RTP, comparisons are hampered by the numerous definitions of RTP used. Moreover, there is no consensus on the criteria used to determine when a person can start playing again. These criteria n...
Article
Objective: To evaluate the effectiveness of a combined treatment of focused shockwave therapy (ESWT) and eccentric training compared with sham-shockwave therapy (placebo) and eccentric training in participants with patellar tendinopathy (PT) after 24 weeks. Design: Randomized controlled trial. Setting: Sports medicine departments of a universi...