Publications by authors named "I Shrier"
Immortal time may arise in survival analyses when individuals are assigned to treatment strategies based on post-eligibility information or selected based on post-assignment eligibility criteria. Selection based on eligibility criteria applied after treatment assignment results in immortal time when the analysis starts the follow-up at assignment. Misclassification of assignment to treatment strategies based on treatment received after eligibility results in immortal time when the treatment strategies are not distinguishable at the start of follow-up.
View Article and Find Full Text PDFArticle Synopsis
- The study aims to evaluate how changing the duration of participation in ice hockey, using the acute:chronic workload ratio (ACWR), affects injury risk in adolescent players without recent injuries.
- Conducted as a prospective cohort study over five years, data were collected from ice hockey players aged 13-17 in Canada, with various participation levels analyzed for injury risk.
- Results showed that increasing participation duration consistently raises injury risk, with no optimal level identified; specifically, injury risk increased notably for ACWR values higher than 2, suggesting higher exposure leads to greater injury likelihood.
Background: Several observational studies of the relationship between training load and injury have found increased risks of injury at low loads. These associations are expected because load is often assessed at the end of the injury follow-up period. As such, athletes who get injured earlier in the follow-up period will have systematically lower loads than athletes who get injured later in the follow-up period.
View Article and Find Full Text PDFObjective: To determine the effect of bye weeks (no practices or games) on the injury event rate in the Canadian Football League (CFL).
Design: Historical (retrospective) cohort study.
Setting: CFL.
Training-Load Management Ambiguities and Weak Logic: Creating Potential Consequences in Sport Training and Performance.
Int J Sports Physiol Perform
September 2024
Background: The optimization of athlete training load is not a new concept; however in recent years, the concept of "load management" is one of the most widely studied and divisive topics in sports science and medicine.
Purpose: Discuss the challenges faced by sports when utilizing training load monitoring and management, with a specific focus on the use of data to inform load management guidelines and policies/mandates, their consequences, and how we move this field forward.
Challenges: While guidelines can theoretically help protect athletes, overzealous and overcautious guidelines may restrict an athlete's preparedness, negatively influence performance, and increase injury risk.