scholarly journals Methods Matter: Beware of collider stratification bias when analyzing recurrent injuries

2021 ◽  
Author(s):  
Ian Shrier ◽  
Steven Stovitz ◽  
Chinchin Wang ◽  
Russell John Steele
Keyword(s):  
Sport Medicine ◽  
Major Objective ◽  
Medicine Research ◽  
Rehabilitation Programs ◽  
Surveillance Programs ◽  
Recurrent Injuries ◽  
Sport Medicine Research ◽  
Multiple Causes

A major objective of sport medicine research is to assess causes of injuries. Studying causes of subsequent injuries, including the effects of rehabilitation programs, presents unique challenges to provide appropriate guidance for treatment. In this commentary, we highlight the issue of “collider stratification bias”. Collider stratification bias is a major concern whenever we restrict populations based on variables that have multiple causes, which is common in surveillance programs studying subsequent injuries.

Biomechanical Comparison of Countermovement Jumps Performed on Land and in Water: Age Effects

2018 ◽  
Vol 27 (3) ◽  
pp. 249-256 ◽  
Author(s):  
Talin Louder ◽  
Dennis Dolny ◽  
Eadric Bressel
Keyword(s):  
Older Adults ◽  
Young Adults ◽  
Sports Medicine ◽  
Mechanical Power ◽  
Water Age ◽  
Cross Sectional ◽  
Medicine Research ◽  
Rehabilitation Programs ◽  
Using Data ◽  
Kinematic Measures

Context:The aquatic environment provides a low-impact alternative to land-based exercise and rehabilitation in older adults.Objective:Evaluate the biomechanics of older adults and young adults performing jumping movements on land and in water.Design and Setting:Cross-sectional, mixed-factorial experiment; adjustable-depth pool at sports medicine research facility.Participants:Fifty-six young adults (age = 22.0 [3.9] y) and 12 healthy older adults (age = 57.3 [4.4] y).Interventions:Each participant performed 6 maximal effort countermovement jumps: 3 jumps were performed on land, and 3 other jumps were performed with participants immersed in chest-deep water.Main Outcome Measures:Using data from the amortization and propulsive phases of jumping, the authors computed the following kinetic and kinematic measures: peak and mean mechanical power, peak force, amortization time and rate, unweighting and propulsive times, and lower-extremity segment kinematics.Results:Mechanical power outputs were greater in younger adults (peak: 7322 [4035] W) versus older adults (peak: 5661.65 [2639.86] W) and for jumps performed in water (peak: 9387 [3981] W) versus on land (peak: 4545.84 [1356.53] W). Peak dorsiflexion velocities were greater for jumps performed in water (66 [34] deg/s) versus on land (4 [7] deg/s). The amortization rate was 26% greater in water versus on land. The amortization time was 20% longer in older adults versus young adults.Conclusions:Countermovement jumps performed in water are mechanically specific from those performed on land. Older adults jumped with longer unweighting times and increased mechanical power in water. These results suggest that aquatic-based exercise and rehabilitation programs that feature jumping movements may benefit older adults.

Biosecurity: tools, behaviours and concepts

2020 ◽  
Vol 4 (5) ◽  
pp. 449-452
Author(s):  
Alan MacLeod ◽  
Nicola Spence
Keyword(s):  
Plant Protection ◽  
Human Life ◽  
Animal Health ◽  
Early Warning Systems ◽  
Policy Makers ◽  
Recent Developments ◽  
Surveillance Programs ◽  
Harmful Organisms ◽  
The One ◽  
Biosecurity Practices

COVID 19 has raised the profile of biosecurity. However, biosecurity is not only about protecting human life. This issue brings together mini-reviews examining recent developments and thinking around some of the tools, behaviours and concepts around biosecurity. They illustrate the multi-disciplinary nature of the subject, demonstrating the interface between research and policy. Biosecurity practices aim to prevent the spread of harmful organisms; recognising that 2020 is the International Year of Plant Health, several focus on plant biosecurity although invasive species and animal health concerns are also captured. The reviews show progress in developing early warning systems and that plant protection organisations are increasingly using tools that compare multiple pest threats to prioritise responses. The bespoke modelling of threats can inform risk management responses and synergies between meteorology and biosecurity provide opportunities for increased collaboration. There is scope to develop more generic models, increasing their accessibility to policy makers. Recent research can improve pest surveillance programs accounting for real-world constraints. Social science examining individual farmer behaviours has informed biosecurity policy; taking a broader socio-cultural approach to better understand farming networks has the potential to change behaviours in a new way. When encouraging public recreationists to adopt positive biosecurity behaviours communications must align with their values. Bringing together the human, animal, plant and environmental health sectors to address biosecurity risks in a common and systematic manner within the One Biosecurity concept can be achieved through multi-disciplinary working involving the life, physical and social sciences with the support of legislative bodies and the public.

Use of Vestibular Rehabilitation in the Pediatric Population

2019 ◽  
Vol 4 (6) ◽  
pp. 1399-1405 ◽  
Author(s):  
Jennifer Christy
Keyword(s):  
Pediatric Population ◽  
Dynamic Balance ◽  
Vestibular Rehabilitation ◽  
Rehabilitation Program ◽  
Gross Motor ◽  
Gaze Stabilization ◽  
Motor Delay ◽  
Rehabilitation Programs ◽  
Motor Practice ◽  
Balance Exercises

Purpose The purpose of this article was to provide a perspective on vestibular rehabilitation for children. Conclusion The developing child with vestibular dysfunction may present with a progressive gross motor delay, sensory disorganization for postural control, gaze instability, and poor perception of motion and verticality. It is important that vestibular-related impairments be identified early in infancy or childhood so that evidence-based interventions can be initiated. A focused and custom vestibular rehabilitation program can improve vestibular-related impairments, enabling participation. Depending on the child's age, diagnosis, severity, and quality of impairments, vestibular rehabilitation programs may consist of gaze stabilization exercises, static and dynamic balance exercises, gross motor practice, and/or habituation exercises. Exercises must be modified for children, done daily at home, and incorporated into the daily life situation.

Deficits in Selective Attention Alter Gait in Frail Older Adults

GeroPsych ◽  
2016 ◽  
Vol 29 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Véronique Cornu ◽  
Jean-Paul Steinmetz ◽  
Carine Federspiel
Keyword(s):  
Older Adults ◽  
Nursing Home ◽  
Selective Attention ◽  
Dual Task ◽  
Nursing Home Residents ◽  
Gait Rehabilitation ◽  
Rehabilitation Programs ◽  
Gait Parameters ◽  
Growing Body ◽  
Task Conditions

Abstract. A growing body of research demonstrates an association between gait disorders, falls, and attentional capacities in older adults. The present work empirically analyzes differences in gait parameters in frail institutionalized older adults as a function of selective attention. Gait analysis under single- and dual-task conditions as well as selective attention measures were collected from a total of 33 nursing-home residents. We found that differences in selective attention performances were related to the investigated gait parameters. Poorer selective attention performances were associated with higher stride-to-stride variabilities and a slowing of gait speed under dual-task conditions. The present findings suggest a contribution of selective attention to a safe gait. Implications for gait rehabilitation programs are discussed.

Unique Rehabilitation Programs in a Federal Prison

1976 ◽  
Vol 21 (2) ◽  
pp. 130-131 ◽  
Author(s):  
LOWELL B. PARSONS
Keyword(s):  
Federal Prison ◽  
Rehabilitation Programs
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