# Validity of the Enode Sensor and My Jump 3 App for Assessing Countermovement Jump Performance
## 4 Discussion
The high R\({}^{2}\) value and significance level indicate that My Jump 3 could serve as a practical and accessible alternative for performance monitoring in athletic settings, providing reliable data that align closely with laboratory-based Force Plate measurements. An R\({}^{2}\) value near 1, observed for both the Enode Sensor and My Jump 3 App, demonstrated that a substantial proportion of the variance in Force Plate measurements can be accounted for by these tools, highlighting their strength as predictors of jump heights. These results suggest that both the Enode Sensor and My Jump 3 Appoffer reliable estimates of jump heights, with minimal accuracy loss relative to Force Plate measurements, making them suitable for both training and competitive settings. Despite these promising results, it is crucial to acknowledge limitations. The controlled conditions under which measurements were taken may limit the generalizability of these findings. Previous research suggests that environmental variability, such as surface conditions and lighting, can impact measurement accuracy in real-world settings [59; 60]. Thus, future studies should validate these devices in field-based scenarios with a more diverse sample to enhance the robustness of the results. Additionally, although three jumps were performed per participant, only the best jump was selected for analysis, which prevented the further calculation of absolute reliability measures (standard error of measurement--SEM--and minimal detectable change--MDC). Incorporating multiple testing sessions or additional trials in future research would enable these indices to be determined, providing a more comprehensive interpretation of the data. Furthermore, despite the app being operated by an experienced observer with expertise as a strength and conditioning (S&C) coach--ensuring adherence to the app's guidelines and utilizing the highest available recording frequency--errors may still have occurred because of inaccuracies in marking the jump/landing moments or frame omissions in the recording frequency. Nevertheless, the app's flexibility, cost effectiveness, and practical applications in training environments make it a valuable tool, with future studies potentially enhancing its accuracy through automated frame detection or higher-frequency cameras. Lastly, the Enode Sensor and My Jump 3 App demonstrated excellent reliability and validity in measuring vertical jump heights when compared to the Force Plate measurements, offering practical, cost-effective solutions for sports performance monitoring. These tools have the potential to democratize access to performance data, allowing for continuous, real-time athlete monitoring that can support individualized training adjustments and load management without requiring expensive laboratory equipment. The implications of this study suggest that as technology advances, wearable sensors and mobile applications will continue to play integral roles in sports science, offering versatile tools for assessing and optimizing athletic performance in dynamic, real-world environments. Future studies should extend beyond the current controlled laboratory setting by evaluating these tools across diverse athletic populations and under more dynamic, field-based conditions to enhance their generalizability and practical relevance.