Influence of Fatigue on Selected Kinematic Parameters in High Jump – A Pilot Case Study

Abstract

PURPOSE: High jump, a complex athletic activity, involves distinct phases crucial for success, notably the take-off phase. While previous studies explored kinematic parameters' influence on high jump success, none investigated their fatigue-induced changes. This pilot study aimed to explore fatigue's impact on kinematic parameters in high jump performance. METHODS: A prominent Croatian junior high jumper underwent rested and fatigued jumping sessions. Internal fatigue was assessed via the Wellness questionnaire and session rating of perceived exertion (sRPE). External fatigue parameters were assessed through bilateral and unilateral Countermovement Jump (CMJ) height using Gyko and Optogait devices. Kinematic parameters were recorded via Logitech C920 and Xiaomi Redmi Note 8 Pro cameras, including contact time, take-off place, knee and body angles. RESULTS: Significant differences were observed in knee angle touchdown (p=0,01), knee angle take-off (p=0,05), body angle touchdown (p=0,01), body angle take-off (p=0,03), knee amortization start (p=0,05), and knee amortization (p=0,01). CONCLUSION: Fatigue significantly impacts kinematic parameters in high jump, particularly affecting body inclination during take-off, knee angles, and knee amortization. Coaches should consider fatigue when planning training and competition schedules for optimal performance. Maintaining rested conditions is crucial, and targeted training can enhance muscle groups affected by fatigue during specific jump phases.