Maximising the use of asymmetry data for profiling, rehab and fatigue monitoring with Chris Bishop
Aug 24, 2023
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Dr. Chris Bishop, Associate Professor at Middlesex University, discusses the intricacies of asymmetries in sports performance. He emphasizes the need for context-aware analysis and highlights the limitations of relying solely on asymmetry metrics. Chris explores correlations, challenges with force plates, and selecting meaningful metrics for fatigue monitoring and injury rehab.
Asymmetries as a metric to assess performance and injury risk have limitations due to the noisiness and variability of the data.
The counter movement jump test and asymmetry data can be used in different scenarios, including performance profiling, fatigue monitoring, and rehab protocols, but the selection of metrics should be purpose-driven and context-specific.
When using force plates for asymmetry assessment, it is important to consider the test's relevance to the sport's needs and the athlete's training history, with different metrics being valuable for monitoring performance, neuromuscular fatigue, and injury rehabilitation.
Deep dives
The challenges and limitations of using asymmetries as a metric
Asymmetries as a metric to assess performance and injury risk have limitations due to the noisiness and variability of the data. Single time point associative studies have shown mixed results, with some indicating larger asymmetries correlating with worse performance. Training interventions have shown minimal changes in asymmetries, and it remains unclear if reducing asymmetries leads to improved performance. The repeatability and threshold concepts of asymmetries are also questioned, as well as the value of using ratio metrics. The variability and multiple strategies in performing a counter movement jump further complicate the interpretation of asymmetry data.
Using asymmetries for performance profiling, fatigue monitoring, and rehab
The counter movement jump test and asymmetry data can be used in different scenarios. Performance profiling involves correlating asymmetry metrics with performance outcomes, such as jump height or speed, to assess an athlete's readiness or progress. Fatigue monitoring utilizes the counter movement jump to track changes in asymmetries as a sign of neuromuscular fatigue or recovery. Rehab protocols can also incorporate the test to evaluate an injured athlete's progress and readiness to return to play. However, the selection of metrics should be purpose-driven, considering the specific goals and context of each scenario.
Choosing the appropriate metrics for different scenarios
When selecting metrics for performance profiling, emphasizing strong performance-related metrics like jump height is recommended. For fatigue monitoring, metrics that show changes in asymmetries over time can provide insights into an athlete's readiness or recovery. In rehab settings, metrics that assess progress and symmetry restoration should be prioritized. It is important to consider the purpose of the test, the available resources, and the intended outcomes when choosing the appropriate asymmetry metrics.
The Importance of Assessing Asymmetry Data
Assessing asymmetry data in athletes can help identify real imbalances and potential areas for further investigation. For an asymmetry to be considered real, the interlimb percentage difference should be greater than the intra-limb variability. If a consistently greater asymmetry is observed over multiple test sessions and shows consistency in directionality, it may indicate a real imbalance that could benefit from addressing and improving the weaker limb's capacity. Strengthening the weaker limb can improve its ability to handle stress and reduce the risk of non-contact repetitive stress trauma.
Considerations for Metric Selection and Asymmetry Assessment
When using force plates for asymmetry assessment in athletes, it is important to consider the test's relevance to the sport's needs and the athlete's training history. Bilateral and unilateral jump tests on force plates provide different information, with single-leg tests offering a better measure of true limb capacity. Metrics such as jump height, power, and impulse can be useful for monitoring performance. Additionally, time-oriented metrics, like time to take off, can be valuable in monitoring neuromuscular fatigue. Landing orientated metrics and force at different time points, such as force at 100 milliseconds, may be relevant for injury rehabilitation and return-to-play assessments.
In this episode of the Pacey Performance Podcast, Dr. Chris Bishop, Associate Professor at Middlesex University delves deep into the intricacies of asymmetries, exploring their relevance and implications across various aspects of sports performance. Chris dissects the misconceptions and misunderstandings associated with asymmetry metrics, emphasizing the need for context-aware analysis and a balanced perspective.
The conversation delves into the practical challenges faced by practitioners and researchers in interpreting asymmetry data obtained from jump testing and other performance assessments. Chris' insights shed light on the limitations of relying solely on asymmetry metrics as a predictive tool and the importance of considering individual biomechanical factors and sports-specific demands.
As the episode goes on, Chris navigates the listeners through the nuances of correlating asymmetry metrics with broader performance outcomes. He addresses the common pitfalls of overreliance on correlations and offers valuable insights into identifying meaningful relationships between asymmetry data and athlete performance. Chris also tackles the challenges posed by force plates, shedding light on the complexities of interpreting data and selecting meaningful metrics for assessing neuromuscular fatigue, profiling performance, and aiding injury rehabilitation.
This is an incredible episode from the Godfather of asymmetries.