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Effect of acceleration on the rate of power development and neural activity of the leg extensors across the adult life span

  • Stijn Van DriesscheEmail author
  • Evelien Van Roie
  • Benedicte Vanwanseele
  • Christophe Delecluse
Original Article
  • 11 Downloads

Abstract

Purpose

The rate of power development (RPD) represents the capacity to rapidly generate power during a dynamic muscle contraction. As RPD is highly susceptible to aging, its decline can have important functional consequences. However, the effect of age on RPD in response to rapid changes in movement velocity (cfr. fall incidence) is not yet clear. Therefore, the present study aimed to examine the effect of age on RPD and neural drive in response to different accelerations.

Methods

Three maximal isokinetic leg extensor tests at 540°/s with different initial acceleration phases at 3200, 5700 and 7200°/s2 were performed. RPD, which is the slope of the power-time curve during the acceleration phase, was calculated for 83 subjects aged between 20 and 69 years. Mean electromyography signal amplitude was determined for rectus femoris (RF), vastus lateralis (VL) and biceps femoris muscles.

Results

The average annual age-related decline rate of RPD at highest acceleration was − 2.93% and was − 1.52% and − 1.82% higher compared to lower acceleration rates (p < 0.001). This deficit can probably be explained by an age-related impairment in neural drive during the first 75 ms of the acceleration phase, as evidenced by a reduced RF and VL neuromuscular activity of − 0.30% and − 0.36% at highest versus lowest acceleration (p < 0.05).

Conclusion

These findings highlight the inability of aged individuals to quickly respond to abrupt changes in movement velocity, which requires more focus in training and prevention programs.

Keywords

Sarcopenia Aging Fall prevention Explosive power 

Abbreviations

BF

Biceps femoris

EMG

Electromyography

mA

Mean EMG amplitude

RF

Rectus femoris

RPD

Rate of power development

VL

Vastus lateralis

Notes

Author contributions

SVD conceived of the study, participated in the design and coordination of the study, performed the measurements and analysis, interpreted the data and wrote the manuscript; EVR participated in the design of the study, interpretation of the data and writing of the manuscript; BVW participated in the design of the study and writing of the manuscript; CD conceived of the study, participated in the design of the study and interpretation of the data and approved the final manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Physical Activity, Sports and Health Research Group, Department of Movement Sciences, Faculty of Movement and Rehabilitation SciencesKU LeuvenLeuvenBelgium
  2. 2.Human Movement Biomechanics Research Group, Department of Movement SciencesKU LeuvenLeuvenBelgium

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