Effects of Different Loading Types on the Validity and Magnitude of Force-Velocity Relationship Parameters

Author:

Jankovic Goran1,Janicijevic Danica1,Nedeljkovic Aleksandar1,Petrovic Milos R.1,Cosic Marko1,Garcia-Ramos Amador23

Affiliation:

1. University of Belgrade, Faculty of Sport and Physical Education, The Research Center, Belgrade, Serbia

2. University of Granada, Faculty of Sport Sciences, Department of Physical Education and Sport, Granada, Spain

3. Universidad Católica de la Santísima Concepción, Faculty of Education, Department of Sports Sciences and Physical Conditioning, Concepción, Chile

Abstract

Background: Force-velocity ( F-V) relationship models gained popularity as a tool for muscle mechanical assessment. However, it is not clear whether the validity of the F-V relationship parameters (maximal theoretical force [ F0], velocity [ V0] and power [ Pmax]) is affected using different load types: gravitational ( W, rubber bands pulling the barbell downward), inertial ( I, rubber bands pulling the barbell, which is equalized to the weight of the added plates upward), and combined ( W + I, weight of the plates). Hypothesis: Load type would affect both the magnitude and validity of F-V relationship parameters. The highest magnitude and validity was expected for F0 using a W, for V0 using an I, and for Pmax using a W + I load. Study Design: Cross-sectional. Level of Evidence: Level 3. Methods: A total of 13 resistance-trained men (body mass, 87.7 ± 11.2 kg and body height, 183.9 ± 6.4 cm) performed bench press (BP) throws (BPTs) using 3 types of loads against 30 to 80 kg. The validity of F-V relationship parameters was explored with respect to the tests used traditionally for force (maximal voluntary contraction and 1-repetition maximum [1RM]), velocity (maximal velocity achieved during almost unloaded tasks), and power (BPT against the 50%1RM and medicine ball throws) assessment. Results: The W + I loading promoted the highest values of F0 and Pmax, while the highest magnitude of V0 was promoted by the I loading. The validity was acceptable for F0 obtained using the 3 loading conditions with respect to the BP 1RM ( r range, 0.30-0.83), and V0 obtained using the I loading with respect to the stick throw ( r = 0.54). Conclusion: The magnitude of the F-V relationship parameters is affected by load type, but their validity with respect to standardized tests is comparable, with the exception of the higher validity of V0 when obtained using the I loading. Clinical relevance: Any load type can be used for assessing F0, while I load should be selected when assessing V0.

Publisher

SAGE Publications

Subject

Physical Therapy, Sports Therapy and Rehabilitation,Orthopedics and Sports Medicine

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