BACKGROUND: Causes of anterior cruciate ligament (ACL) injuries are multifactorial. Anterior cruciate ligament injury prevention should thus be approached from a multifactorial perspective as well. Training to resist fatigue is an underestimated aspect of prevention programs given that the presence of fatigue may play a crucial role in sustaining an ACL injury.OBJECTIVES:The primary objective of this literature review was to summarize research findings relating to the kinematic and kinetic effects of fatigue on single-leg landing tasks through a systematic review and meta-analysis. Other objectives were to critically appraise current approaches to examine the effects of fatigue together with elucidating and proposing an optimized approach for measuring the role of fatigue in ACL injury prevention.METHODS:A systematic literature search was conducted in the databases PubMed (1978-November 2017), CINAHL (1992-November 2017), and EMBASE (1973-November 2017). The inclusion criteria were: (1) full text, (2) published in English, German, or Dutch, (3) healthy subjects, (4) average age ≥ 18 years, (5) single-leg jump landing task, (6) evaluation of the kinematics and/or kinetics of the lower extremities before and after a fatigue protocol, and (7) presentation of numerical kinematic and/or kinetic data. Participants included healthy subjects who underwent a fatigue protocol and in whom the effects of pre- and post-fatigue on three-dimensional lower extremity kinematic and kinetics were compared. Methods of data collection, patient selection, blinding, prevention of verification bias, and study design were independently assessed.RESULTS:Twenty studies were included, in which four types of single-leg tasks were examined: the single-leg drop vertical jump, the single-leg drop landing, the single-leg hop for distance, and sidestep cutting. Fatigue seemed to mostly affect initial contact (decreased angles post-fatigue) and peak (increased angles post-fatigue) hip and knee flexion. Sagittal plane variables at initial contact were mostly affected under the single-leg hop for distance and sidestep cutting conditions whilst peak angles were affected during the single-leg drop jump.CONCLUSIONS:Training to resist fatigue is an underestimated aspect of prevention programs given that the presence of fatigue may play a crucial role in sustaining an ACL injury. Considering the small number of variables affected after fatigue, the question arises whether the same fatigue pathways are affected by the fatigue protocols used in the included laboratory studies as are experienced on the sports field.
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Although the benefits of current anterior cruciate ligament (ACL) injury prevention programmes have been demonstrated in efficacy studies, they, unfortunately, have had limited public health impact to date. For example, the incidence of ACL injuries continues to rise in adolescent athletes. Raising awareness and educating coaches and athletes is not enough to facilitate the widespread, sustained use of these programmes in the real-world setting. Considering the profound burden of ACL injuries, it is necessary to continue to improve the current ACL injury prevention programmes through co-creation. First, the uptake of the programmes should be optimized by a better appreciation and understanding of the individual, socio-cultural and environmental context (i.e., community). Second, the content of the programmes should be optimized to better reflect the demands of the sport by creating more ownership and increasing motivation (incorporating challenging, sport-specific and fun elements) with the end-users. In addition, implicit motor learning, random practice and differential learning are concepts that should be integrated when practising to obtain the most optimal results when learning or finetuning skills.
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Background: Marital status is associated with prognosis in patients with cardiovascular disease (CVD).However, the influence of partners on successful modification of lifestyle-related risk factors (LRFs) in secondaryCVD prevention is unclear. Therefore, we studied the association between the presence of a partner,partner participation in lifestyle interventions and LRF modification in patients with coronary arterydisease (CAD).Methods: In a secondary analysis of the RESPONSE-2 trial (n=711),which compared nurse-coordinated referralto community-based lifestyle programs (smoking cessation, weight reduction and/or physical activity) to usualcare in patients with CAD, we investigated the association between the presence of a partner and the level ofpartner participation on improvement in >1 LRF (urinary cotinine <200 ng/l, ≥5% weight reduction, ≥10% increased6-min walking distance) without deterioration in other LRFs at 12 months follow-up.Results: The proportion of patients with a partner was 80% (571/711); 19% women (108/571). In the interventiongroup, 48% (141/293) had a participating partner in ≥1 lifestyle program. Overall, the presence of apartner was associated with patients' successful LRF modification (adjusted risk ratio (aRR) 1.93, 95% confidenceinterval (CI) 1.40–2.51). A participating partner was associated with successful weight reduction(aRR 1.73, 95% CI 1.15–2.35).Conclusion: The presence of a partner is associated with LRF improvement in patients with CAD. Moreover, patientswithpartners participating in lifestyle programs aremore successful in reducingweight. Involving partnersof CAD patients in weight reduction interventions should be considered in routine practice.
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