The influence of isokinetic dynamometer configuration on eccentric hamstring strength metrics: implications for...

Area of Science:

• Biomechanics
• Sports Medicine
• Clinical Assessment

Background:

• Isokinetic dynamometry is the gold standard for strength assessment.
• Current protocols may lack functional relevance for hamstring strength.
• Understanding configuration effects is crucial for accurate interpretation.

Purpose of the Study:

• To quantify the influence of dynamometer configuration on eccentric hamstring strength metrics.
• To compare seated versus extended hip positions during testing.
• To assess the functional relevance of different testing setups.

Main Methods:

• 23 trained participants performed isokinetic eccentric knee flexor trials at 180°·s^-1.
• Testing was conducted in both seated and extended hip positions.
• Peak torque, isokinetic range, and functional range were measured.

Main Results:

• The extended hip position resulted in significantly greater peak torque (P=0.04).
• Peak torque in the extended position was achieved at a greater degree of knee flexion (P<0.001).
• Isokinetic and functional ranges remained consistent but occurred at more flexed knees in the extended position.

Conclusions:

• Dynamometer configuration, specifically hip position, influences eccentric hamstring strength metrics.
• The extended hip configuration may better mimic hamstring strain injury mechanisms.
• Configuration sensitivity has implications for clinical strength assessment and training adaptations.