Problem Statement: High-intensity movements place a substantial mechanical load on the ankle joint, increasing the risk of injury to the ankle complex if the musculoskeletal system is not adequately prepared. Currently, there is limited evidence regarding whether unilateral ankle plantar flexor (PF) strength components provide an accurate measure of an athlete`s single-limb readiness for plyometric activities and the potential risk of ankle complex injuries. Purpose: The primary aim was to assess differences in the unilateral reactive strength index (RSI) and isometric ankle muscle strength among male floorball players across age groups, playing positions, and competitive levels. The secondary aim was to determine strength benchmarks and to explore the relationship between relative PF strength and the RSI. Methods: Seventy-six athletes (under 17 years [U17]: n = 27; under 20 years [U20]: n = 23; and 20+ years: n = 26) performed a unilateral foot-ankle 10/5 rebound jump and isometric seated PF strength test. Strength levels were categorised using the T-scores. Results: The unilateral RSI and relative PF strength significantly differed across the age groups (p < .05, eta² = .088-.120) and playing levels (p < .001, d = 0.87-1.59), but not by playing position. Thirteen athletes had a poor RSI and poor PF strength in both measures, while twelve had good RSI, but fifteen had good relative PF strength. Unilateral relative PF strength associated with the RSI (r = .403-.593, p < .01), with weaker athletes demonstrating a lower average power and jump height. Conclusions: These findings highlight differences in unilateral strength components, suggesting that athletes with a stronger ankle PF tend to perform jumps better. Younger and lower level floorball players may benefit from targeted ankle strengthening to enhance performance and reduce injury risk.
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