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The rate of force development scaling factor (RFD-SF): protocol, reliability, and muscle comparisons

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Abstract

Performing a set of isometric muscular contractions to varied amplitudes with instructions to generate force most rapidly reveals a strong linear relationship between peak forces (PF) achieved and corresponding peak rates of force development (RFD). The slope of this relationship, termed the RFD scaling factor (RFD-SF), quantifies the extent to which RFD scales with contraction amplitude. Such scaling allows relative invariance in the time required to reach PF regardless of contraction size. Considering the increasing use of this relationship to study quickness and consequences of slowness in older adults and movement disorders, our purpose was to further develop the protocol to measure RFD-SF. Fifteen adults (19–28 years) performed 125 rapid isometric contractions to a variety of force levels in elbow extensors, index finger abductors, and knee extensors, on 2 days. Data were used to determine (1) how the number of pulses affects computation of the RFD-SF, (2) day-to-day reliability of the RFD-SF, and (3) the nature of RFD-SF differences between diverse muscle groups. While sensitive to the number of pulses used in its computation (P < .05), RFD-SF was reliable when computed with >50 pulses (ICC > .7) and more so with 100–125 pulses (ICC = .8–.92). Despite differences in size and function across muscles, RFD-SF was generally similar (i.e., only 8.5% greater in elbow extensors than in index finger abductors and knee extensors; P = .049). Results support this protocol as a reliable means to assess how RFD scales with PF in rapid isometric contractions as well as a simple, non-invasive probe into neuromuscular health.

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Acknowledgments

The project described was supported by Grant Number 1R21AR060659-01A2 from the National Institute of Arthritis and Musculoskeletal and Skin Diseases. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Arthritis and Musculoskeletal and Skin Diseases or the National Institutes of Health.

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  1. Department of Kinesiology and Applied Physiology, University of Delaware, 541 S. College Ave, Newark, DE, 19716, USA

    Maria Bellumori, Slobodan Jaric & Christopher A. Knight

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  1. Maria Bellumori
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  2. Slobodan Jaric
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  3. Christopher A. Knight
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Correspondence to Christopher A. Knight.

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Bellumori, M., Jaric, S. & Knight, C.A. The rate of force development scaling factor (RFD-SF): protocol, reliability, and muscle comparisons. Exp Brain Res 212, 359–369 (2011). https://doi.org/10.1007/s00221-011-2735-7

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  • DOI: https://doi.org/10.1007/s00221-011-2735-7

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