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. 2021 Jan 25;18(3):1032.
doi: 10.3390/ijerph18031032.

Are the Parameters of Novel Two-Point Force-Velocity Model Generalizable in Leg Muscles?

Saša Đurić  1 , Vladimir Grbić  2 , Milena Živković  2 , Nikola Majstorović  2 , Vedrana Sember  1
Affiliations

Are the Parameters of Novel Two-Point Force-Velocity Model Generalizable in Leg Muscles?

Saša Đurić et al. Int J Environ Res Public Health. .

Abstract

The two-point force-velocity model allows the assessment of the muscle mechanical capacities in fast, almost fatigue-free conditions. The aim of this study was to investigate the concurrent validity of the two-point parameters with directly measured force and power and to examine the generalization of the two-point parameters across the different functional movement tests of leg muscles. Twelve physically active participants were tested performing three functional lower limb maximal tests under two different magnitudes of loads: countermovement jumps, maximal cycling sprint, and maximal force under isokinetic conditions of the knee extensors. The results showed that all values from the two-point model were higher than the values from the standard tests (p < 0.05). We also found strong correlations between the same variables from different tests (r ≥ 0.84; p < 0.01), except for force in maximal cycling sprint, where it was low and negligible (r = -0.24). The results regarding our second aim showed that the correlation coefficients between the same two-point parameters of different lower limb tests ranged from moderate to strong (r -0.47 to 0.72). In particular, the relationships were stronger between power variables than between force variables and somewhat stronger between standard tests and two-point parameters. We can conclude that mechanical capacities of the leg muscles can be partially generalized between different functional tests.

Keywords: biomechanics; exercise; force-velocity relationship; performance; resistance; two-point model.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Flow chart of data collection.
Figure 2
Figure 2
Two-point model presented for three different functional tests of lower limb muscles averaged across participants.
Figure 3
Figure 3
The averaged across the participant values of F (top panel), and P (bottom panel) obtained from the two-point model (open bars) and standard tests (filled bars) for all lower limb tests (means with SD error bars). The correlation coefficients are presented in parentheses above bars (* p < 0.05—significance of correlation). Significant differences between the two-point parameters and maximal values obtained from standard tests are marked (* p < 0.05).
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