AI Article Synopsis

  • - This study examines how different types of jumps (unilateral vs. bilateral) and various measures (mean force, propulsive impulse, jump height) are affected by fatigue and their effectiveness in revealing inter-limb asymmetries.
  • - Thirty-eight participants completed countermovement jumps before and after either a unilateral or bilateral fatigue protocol, with results showing a decrease in jump performance for both protocols.
  • - The findings suggest that unilateral jumps are more effective than bilateral jumps for highlighting changes in inter-limb asymmetries caused by fatigue, indicating their importance for testing purposes.

Article Abstract

This study explores the sensitivity of jump type (unilateral and bilateral) and output variable (mean force, propulsive impulse, and jump height) to detect the changes in inter-limb asymmetries induced by unilateral and bilateral fatigue protocols. Thirty-eight individuals performed two testing sessions that consisted of (I) nine "pre-fatigued" countermovement jumps (CMJs; three bilateral and six unilateral [three with each leg]), (II) fatigue protocol and (III) nine "post-fatigued" CMJs. The testing sessions only differed in the fatigue protocol (five sets to failure against the 15-repetition maximum load using either the unilateral or bilateral knee extension exercise). The magnitude of all CMJ-derived variables (mean force, impulse, and jump height) decreased following both unilateral ( ≤ 0.002) and bilateral fatigue protocols ( ≤ 0.018). However, only unilateral protocol accentuated inter-limb asymmetries, which was detected for all variables during the unilateral CMJ (from -4.33% to -2.04%; all  < 0.05) but not during the bilateral CMJ (from -0.64% to 0.54%; all  > 0.05). The changes in inter-limb asymmetries following the unilateral and bilateral fatigue protocols were not significantly correlated between the unilateral and bilateral CMJs ( ≤ 0.172). The unilateral CMJ should be recommended for the testing purposes over the bilateral CMJ due to its greater sensitivity to detect the selective effects of fatigue.

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http://dx.doi.org/10.1080/02640414.2023.2235157DOI Listing

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