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Mette Kreutzfeldt Zebis

Mette Kreutzfeldt Zebis
University College Copenhagen & Bispebjerg and Frederiksberg Hospital University of Copenhagen

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118
Publications
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Publications

Publications (118)
Article
Full-text available
Non-traumatic shoulder injuries are common in team handball. However, many athletes continue to throw, despite pain in the shoulder. This study investigated upper body kinematics and muscle activation while throwing in female elite handball players with and without shoulder pain. Thirty female elite team handball players, 15 with pain (age 22.2 ± 2...
Article
Full-text available
Background Differences in shoulder-disability among common shoulder-disorders in orthopaedic specialist care is unknown. Furthermore, rating of shoulder-disability using patient-reported outcomes is time-consuming, and a faster approach is needed. Objectives First, compare shoulder-disability among common shoulder-disorders. Secondly, rate shoulde...
Article
Background: Ankle sprain is the most common type of sports injury, especially in team sports. Standing and dynamic landing balance, as an indicator of ankle instability, were investigated using varying experimental approaches. Methods: In the present cross-sectional study, 81 adolescent female elite handball and football players were divided int...
Conference Paper
Full-text available
Background The hamstring muscle strengthening is an integral part of validated injury prevention programs in football. However, it is unknown whether hamstring muscle strengthening exercises are used in female elite football. Objective To investigate the use of hamstring muscle strengthening in female elite football training. Design Descriptive,...
Conference Paper
Background Shoulder rotation strength deficit measured at one time-point during preseason has been investigated as a risk factor for shoulder problems in sports with conflicting results. However, athletes face changes in physical demands and accumulative training exposure during a season, which likely influence their rotation strength over this per...
Article
Full-text available
In rehabilitation, four single leg hop tests are frequently used for evaluation of ACL injured children. However, reference values on single leg hop performance and the corresponding limb symmetry indexes (LSIs) of healthy children younger than 15 years of age are lacking. Thus, the purpose was to describe hop performance and LSIs in healthy Danish...
Article
Purpose: Retraction of semitendinosus muscle has been reported after reconstruction of the anterior cruciate ligament with semitendinosus/gracilis-graft. However, very little data exist on the natural variation in side-to-side length symmetry. The purpose of this study was to investigate the side-to-side asymmetry of semitendinosus muscle length i...
Article
Full-text available
Background: Hamstring injuries remain a major burden in football while the effective prevention exercise the Nordic Hamstring is poorly adopted, despite the added positive effects on performance. Better understanding of hamstring function during Nordic Hamstring compared to other exercises may provide better insight to the physiological adaptation...
Article
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# Background Reduced activation of the hamstring muscles and specifically the medial semitendinosus muscle (ST) has been shown to be a risk factor for non-contact anterior cruciate ligament (ACL) injury. Specific hamstring strength exercises may show high ST activity, however the effect of unilateral vs. bilateral exercise execution on ST activati...
Article
Full-text available
Background: A strong recommendation against subacromial decompression surgery was issued in 2019. This leaves nonoperative care as the only treatment option, but recent studies suggest that the dose of strengthening exercise is not sufficient in current nonoperative care. At this point, it is unknown if adding more strengthening to current nonoper...
Article
Background: Patients with a bone sarcoma who undergo limb-sparing surgery and reconstruction with a tumor prosthesis in the lower extremity have been shown to have reduced self-reported physical function and quality of life (QoL). To provide patients facing these operations with better expectations of future physical function and to better evaluat...
Article
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Purpose To identify modifiable biomechanical and neuromuscular anterior cruciate ligament (ACL) injury risk factors for first-time ACL injury in adolescent female elite football and team handball players. Methods Adolescent female elite football and handball players with no previous ACL injury participated in the present study. At baseline, player...
Article
Objectives We aimed to determine the use of injury prevention exercises and injury prevention exercise programs in Danish youth handball and investigate coach and player experiences, beliefs and attitudes of injury and their prevention. Design A mixed-methods design consisting of cross-sectional quantitative surveys and qualitative interviews. Me...
Article
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Muscle strength assessment is fundamental to track the progress of performance and prescribe correct exercise intensity. In field settings, simple tests are preferred. This study develops equations to estimate maximal muscle strength in upper- and lower-extremity muscles based on submaximal elastic resistance tests. Healthy adults (n = 26) performe...
Article
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Purpose: We aimed to investigate the influence of wearing a ballistic vest on physical performance in police officers. Methods: We performed a cross-over study to investigate the influence of wearing a ballistic vest on reaction and response time, lumbar muscle endurance and police vehicle entry and exit times. Reaction and response time was bas...
Article
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Background Evidence-based guidelines recommend exercise-therapy as first line treatment for subacromial pain syndrome, but no previous study has mapped the content of care for subacromial pain syndrome and knowledge about adherence to clinical guidelines are lacking. We aim to describe the content and outcome of current care and investigate the rel...
Article
We evaluated the cardiometabolic effects of a 15-week combined exercise programme, implemented in sports clubs, for 50–70-year-olds with low aerobic fitness. In a randomized controlled trial, 45 participants (26 women) with low fitness were randomly assigned (2:1-ratio) to a training group (TG, n = 30) or inactive control group (CG, n = 15). TG had...
Article
Objective: To investigate change in shoulder rotation strength from preseason to midseason during a competitive season in youth elite handball players without shoulder problems. Design: Prospective cohort study. Methods: Players (n = 292, 45% female, 14-18 years of age) without shoulder problems from Danish youth elite handball clubs were asse...
Article
Background: Non-contact anterior cruciate ligament (ACL) injuries are a major problem among adolescent female soccer and handball players. Therefore, the aim of this study was to examine if known biomechanical and neuromuscular ACL injury risk factors obtained from single-planar jump-landings and multi-planar side-jumps can resemble the demands of...
Article
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Introduction: A significant step towards sport-related injury prevention is the introduction of easily accessible smartphone applications (apps). However, it is unknown whether this type of app-based instruction facilitates similar acute neuromuscular and biomechanical characteristics of the preventive exercises as achieved when instructed on-site...
Article
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Background The incidence of anterior cruciate ligament (ACL) injuries in children is increasing. However, no standardized core set of outcome measures exists for evaluating pediatric ACL injuries. Purpose To perform a scoping review of the literature to identify patient-reported outcome measures (PROMs) and objective outcome measures used to evalu...
Article
Objectives: Regaining muscle strength is essential for successful outcome after anterior cruciate ligament (ACL) injury, why progression of exercise intensity in ACL injury rehabilitation is important. Thus, this study evaluated hamstring and quadriceps muscle activity progression during bodyweight exercises used in a validated ACL injury rehabili...
Article
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There is strong evidence that considerable health benefits can be achieved even with small amounts of physical activity. However, getting people to exercise regularly is a major challenge not least in the elderly population. This study investigated the feasibility and physiological health effects of a pragmatic 15-week exercise programme for sedent...
Article
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Background: Resistance training to failure is an advanced method often used by healthy individuals. Little is known about this type of training in individuals with musculoskeletal pain. Purpose: This study investigates the effect of 10 weeks’ elastic resistance training on neck and shoulder muscle activity during a single set to failure. Study desi...
Article
Full-text available
Young, adolescent female athletes are at particular high risk of sustaining a non-contact anterior cruciate ligament (ACL) injury during sport. Through the last decades much attention has been directed toward various anatomical and biomechanical risk factors for non-contact ACL injury, and important information have been retrieved about the influen...
Chapter
Biomechanics is the study of movement and loading of biomechanical structures, in this case in the handball player. In other words, by using biomechanical measures, knowledge is obtained about movements and coordination of movements, i.e., technique, and the forces exerted by—or applied upon—the body during sports-specific movements. Biomechanical...
Chapter
Knowledge regarding prevention of injuries in handball has improved substantially in the last 10–15 years. We know more about who is injured, how the injury happens and, most importantly, how acute lower extremity injuries, including ACL injuries, can be prevented. As much as 50% of these acute injuries can be prevented by introducing neuromuscular...
Chapter
The efficacy of injury prevention exercise programs (IPEPs) for handball has been established in large-scale randomized controlled trial. Despite this, these programs are currently not implemented in a real-world context.
Chapter
Female hormones fluctuate in concentrations during the menstrual cycle. This has triggered speculations among athletes, coaches, as well as researchers about the hormonal changes that lead to variations in athletic performance and adaptation to training. Many athletes, as in the general population, use oral contraceptives. This has raised questions...
Article
Background: The high injury incidence during match-play in female adolescent football is a major concern. In football, males and females play matches with the same football size. No studies have investigated the effect of football size on injury incidence in female adolescent football. Thus, the aim of the present study was to investigate the effe...
Article
Street soccer has been shown to be effective in improving cardiovascular and musculoskeletal fitness in homeless men, due to high heart rate (HR) and multiple intense actions. The purpose of this study was to investigate HR, movement pattern, rating of perceived exertion (RPE), flow and worry during street soccer for homeless women. Fifteen homeles...
Conference Paper
Introduction The efficacy of knee injury-prevention exercise programs (IPEPs) for handball has been established, however their implementation in Danish youth handball is unknown. This study aimed to assess key IPEP implementation components in Danish youth handball, including coach and player attitudes, beliefs, and experiences. Materials and meth...
Article
Full-text available
Background: Subacromial impingement syndrome (SIS) is a painful, and often long lasting, shoulder condition affecting patient function and quality of life. In a recent study, we observed major strength impairments in shoulder external rotation and abduction (~30%) in a population of patients with pronounced and long-lasting SIS. However, the curre...
Article
Full-text available
Background Impaired patient-reported shoulder function and pain, external-rotation strength, abduction strength, and abduction range-of-motion (ROM) is reported in patients with subacromial impingement (SIS). However, it is unknown how much strength and ROM improves in real-life practice settings with current care. Furthermore, outcomes of treatmen...
Article
Background: Reduced lower extremity muscle strength as well as reduced lower extremity muscle pre-activity (defined as muscular activity just prior to initial ground contact) during high-risk movements are factors related to increased risk of non-contact ACL injury in adolescent female athletes. A strong relationship exists between muscle strength...
Article
Post-menopausal women frequently exhibit low bone mineral density and therefore evidence-based exercises that induce osteogenic loading and prevent osteoporosis are often essential. The purpose of this study was to investigate the loading intensity of three different jumping exercises in post-menopausal women. Fourteen post-menopausal women partici...
Article
Background: While strength training for the neck and shoulder muscles may be effective in reducing headache, the optimal combination of exercise frequency and duration is unknown. This study investigates the effect of different time-wise combinations of one weekly hour of strength training for the neck and shoulder muscles on headache frequency, i...
Article
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Purpose: Prolonged hospital bed rest after severe injury or disease leads to rapid muscle atrophy and strength loss. Therefore, the main aim of this study was to evaluate the efficacy of lower extremity strengthening exercises using elastic resistance that can be performed while lying in a hospital bed. Methods: Using a cross-sectional design, 2...
Article
Background Shoulder function and the prevalence of shoulder complaints in elite badminton are not well described. Objective The aims of this study were to compare players who reported previous or present shoulder complaints with those players who did not. Shoulder function and shoulder problems were quantified. And the players reported influence o...
Article
Background Non-traumatic shoulder injuries are common in overhead sports, however many athletes still participate in their sport despite pain. Non-optimal scapula kinematics at the instant of maximal humeral external rotation (HumExtRot) is considered a risk factor in overhead throwing sports. Objective The aim of the study was to investigate whet...
Article
Full-text available
The aim of the present single-case study was to investigate the effect of 6 weeks’ kettlebell training on the neuromuscular risk profile for ACL injury in a high-risk athlete returning to sport after ACL reconstruction. A female elite soccer player (age 21 years) with no previous history of ACL injury went through neuromuscular screening as measure...
Article
Full-text available
Background: A lateral ankle sprain is the most prevalent musculoskeletal injury in sports. Exercises that aim to improve balance are a standard part of the ankle rehabilitation process. In an optimal progression model for ankle rehabilitation and prevention of future ankle sprains, it is important to characterize different balance exercises based...
Article
Full-text available
Background Adolescent female football and handball players are among the athletes with the highest risk of sustaining anterior cruciate ligament (ACL) injuries. Aim This study evaluated the effects of evidence-based lower extremity injury prevention training on neuromuscular and biomechanical risk factors for non-contact ACL injury. Methods 40 adol...
Article
Knee injuries are common in adolescent female football. Self-reported previous knee injury and low Knee injury and Osteoarthritis Outcome Score (KOOS) are proposed to predict future knee injuries, but evidence regarding this in adolescent female football is scarce. The aim of this study was to investigate self-reported previous knee injury and low...
Article
To investigate the effect on hip-flexion strength of a 6-week hip-flexor training programme using elastic bands as resistance. We hypothesized that the training group, compared to a control group, would increase their hip-flexion strength more. Thirty-three healthy subjects (45 % females), 24(5) years of age, were included in a randomized controlle...
Article
Full-text available
Process evaluation is important to explain success or failure of workplace interventions. This study performs a summative process evaluation of workplace interventions with physical exercise. As part of a randomized controlled trial 132 office workers with neck and shoulder pain were to participate in 10 weeks of elastic resistance training five ti...
Article
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Background: Previous studies report varying rates of time-loss injuries in adolescent female soccer, ranging from 2.4 to 5.3 per 1000 athlete-exposures or 2.5 to 3.7 per 1000 hours of exposure. However, these studies collected data using traditional injury reports from coaches or medical staff, with methods that significantly underestimate injury...
Article
Full-text available
To determine the time-wise effect of specific resistance training on neck pain among industrial technicians with frequent neck pain symptoms. Secondary analysis of a parallel-group cluster randomized controlled trial of 20 weeks performed at two large industrial production units in Copenhagen, Denmark. Women with neck pain >30 mm VAS (N = 131) were...
Article
Biomechanical investigations of sports-specific movements may yield information on which measures could be most efficient for prevention of Anterior Cruciate Ligament (ACL) injuries. High knee valgus moments have been related to increased risk of ACL injury, but further knowledge is needed on how hip strength and hip joint control may influence val...
Article
Full-text available
The most commonly used graft in ACL-reconstructions is harvested from the semitendinosus muscle (ST) which causes atrophy and reduced muscle strength in the hamstrings. As the ST serves as an important ACL agonist, exercises that causes high levels of ST muscle activity after ACL-reconstruction, is of great interest to prevent re-rupture of the ACL...
Article
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Background. Neck/shoulder pain is a common musculoskeletal disorder among adults. The pain is often assumed to be related to muscular tenderness rather than serious chronic disease. Aim. To determine the association between neck/shoulder pain intensity and trapezius muscle tenderness in office workers. Methods. 653 employees from two large office w...
Article
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Objectives: This study investigated long-term effects and implementation processes of workplace strength training for musculoskeletal disorders. Methods: 333 and 140 laboratory technicians from private and public sector companies, respectively, replied to a 3-year follow-up questionnaire subsequent to a 1-year randomized controlled trial (RCT) w...
Article
Therapists commonly use elastic bands in resistance exercises during rehabilitation of smaller muscles, such as in the shoulder. However, the effectiveness has not yet been investigated for larger muscle groups. This study investigates muscle activity during lower extremity exercises. Electromyographic (EMG) activity of 10 muscles was measured in 2...
Article
Full-text available
Objective. To investigate the effect of workplace neck/shoulder strength training with and without regular supervision on neck/shoulder pain and headache among office workers. Method. A 20-week cluster randomized controlled trial among 351 office workers was randomized into three groups: two training groups with the same total amount of planned exe...
Article
Full-text available
Objective: To investigate the effect of workplace neck/shoulder strength training with and without regular supervision on neck/shoulder pain and headache among office workers. Method: A 20-week cluster randomized controlled trial among 351 office workers was randomized into three groups: two training groups with the same total amount of planned...
Article
The aim of this study was to evaluate muscle activity during hamstring rehabilitation exercises performed in training machine compared with elastic resistance. Six women and 13 men aged 28-67 yrs participated in a crossover study. Electromyographic (EMG) activity was recorded in the biceps femoris and the semitendinosus during the concentric and th...
Article
Full-text available
Previous studies have shown positive effects of physical exercise at the workplace on musculoskeletal disorders. However, long-term adherence remains a challenge. The present study evaluates long-term adherence and effects of a workplace strength training intervention on back, neck and upper extremity pain among laboratory technicians. Cluster-rand...