Strength-Endurance: Interaction Between Force-Velocity Condition and Power Output.

Area of Science:

• Sports Science
• Biomechanics
• Exercise Physiology

Background:

• Strength-endurance is typically assessed relative to maximal power output (Pmax).
• However, the same power output can be achieved through varying force and velocity combinations.
• The impact of these force-velocity conditions on strength-endurance remains unclear.

Purpose of the Study:

• To investigate the influence of force-velocity conditions and power output on strength-endurance.
• To determine how different force-velocity profiles affect performance in strength-endurance tasks.

Main Methods:

• Fourteen athletes underwent assessments of force-velocity relationships and strength-endurance via repeated squat jumps.
• Ten individualized force-velocity-power conditions were tested, varying relative power (%Pmax), velocity-specific relative power (%Pmax v), and force-to-velocity ratio (RFv).
• Strength-endurance was measured by maximum repetitions (SJRep) and total work (Wtot); reliability was also assessed.

Main Results:

• Strength-endurance (SJRep and Wtot) was significantly influenced by velocity-specific relative power (%Pmax v) and the force-to-velocity ratio (RFv).
• Maximal power output (%Pmax) was not a significant predictor of strength-endurance.
• Higher SJRep and Wtot were observed at lower %Pmax v and in conditions favoring lower RFv (low force-high velocity).

Conclusions:

• Strength-endurance is highly dependent on an individual's specific force-velocity and power-velocity relationships, as defined by %Pmax v and RFv.
• Standardizing force-velocity conditions and velocity-specific relative power is crucial for reliable strength-endurance testing and effective training program design.