Optimization of the Force-Velocity Relationship Obtained From the Bench-Press-Throw Exercise: An a Posteriori...

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Science

Background:

• The linear force-velocity (F-V) relationship is crucial for understanding muscle function.
• Accurate assessment of F-V parameters like maximum power (Pmax) is vital for performance evaluation.
• Existing methods vary in the number and distribution of data points used.

Purpose of the Study:

• To compare the reliability of F-V relationship outcomes using different load methods.
• To evaluate the impact of data point distribution versus the number of points on F-V reliability.
• To determine the optimal method for reproducible F-V assessment in exercises like the bench-press-throw.

Main Methods:

• A multicenter reliability study analyzed data from 63 healthy men across 3 studies.
• The F-V relationship was assessed using a 2-point method (20-70% 1RM) and multiple-point methods (4-load: 30-60% 1RM; 6-load: 20-70% 1RM).
• Reliability was quantified using the coefficient of variation (CV), with a CV ratio of 1.15 considered the smallest important difference.

Main Results:

• The 2-point method demonstrated greater reliability for F-V outcomes (F0, V0, F-V slope, Pmax) compared to the 4-load method.
• Reliability metrics (CV ratios) for the 2-point method were consistently lower and more favorable than the 4-load method.
• The 6-load multiple-point method yielded reliability comparable to the 2-point method across all F-V parameters.

Conclusions:

• The distance between experimental data points is more critical for a reproducible F-V relationship than the total number of points.
• The 2-point method, utilizing distant loads, offers a reliable and potentially quicker alternative for F-V assessment.
• This finding supports the use of the 2-point method for efficient and dependable evaluation of the F-V relationship.