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Effects of High-Speed Power Training on Neuromuscular and Gait Functions in Frail Elderly with Mild Cognitive Impairment Despite Blunted Executive Functions: A Randomized Controlled Trial

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Abstract

Background

Physical frailty and impaired executive function of the brain show similar pathophysiology. Both of these factors lead to dysfunction of neuromuscular and abilities in elderly. Highspeed power training (HSPT) has been determined to have positive effects on neuromuscular function and gait performance, as well as executive function in the elderly.

Objectives

The purpose of this study was to investigate the effects of 8-week HSPT on neuromuscular, gait and executive functions in frail elderly with mild cognitive impairment (MCI). Design, setting and participants: We performed a randomized controlled trial of frail elderly from community and medical center in republic of Korea. Forty-two physically frail elderly with MCI were randomly allocated to control (n=22, age=74.22±4.46) and intervention groups (n=18, age=73.77±4.64). The intervention group was subjected to HSPT, 3 times weekly for 8 weeks.

Measurements

Isometric contraction of knee extension and flexion with electromyography (EMG) was measured to determine the neuromuscular function such as knee extensor strength, rate of torque development, movement time, pre-motor time, motor time, rate of EMG rise, and hamstrings antagonist co-activation. Additionally, the 4.44-meter gait and timed up-and-go (TUG) test were administered to assess gait performance. A frontal assessment battery was measured in this study.

Results

The 8-week HSPT regimen improved the knee extensor strength from 1.13±0.08 to 1.25±0.07 (p<0.05), the 200-ms RTD from 3.01±0.3 to 3.55±0.24 (p<0.05) and the rate of EMG rise from 166.48±13.31 to 197.94±11.51 (p<0.05), whereas the movement time and motor time were statistically decreased from 921.69±40.10 to 799.51±72.84, and 271.40±19.29 to 181.15±38.08 (p<0.05), respectively. The 4.44-m gait speed and TUG significantly decreased from 6.39±0.25 to 5.5±0.24, and 11.05±0.53 to 9.17±0.43 respectively (p<0.05).

Conclusion

The findings of this study suggest the favorable effects of 8-week HSPT on the neuromuscular function and the gait performance in the frail elderly with MCI without increase in the executive function.

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Acknowledgments

This paper was supported by the Dongjakgu public health center, the Department of Neuropsychiatry in Boramae Hospital from Seoul official government and the Dongjak-gu center for dementia.

Funding

Funding: This study was supported by the Institute on Aging, Seoul National University, and National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning (Korea Mouse Phenotyping Project NRF-2013M3A9D5072550, 2017M3A9D5A01052447). The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of data; in the preparation of the manuscript; or in the review or approval of the manuscript.

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Correspondence to Wook Song.

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Conflict of interest: On behalf of all the authors, the corresponding author states that there is no conflict of interest.

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Lee, D.W., Yoon, D.H., Lee, JY. et al. Effects of High-Speed Power Training on Neuromuscular and Gait Functions in Frail Elderly with Mild Cognitive Impairment Despite Blunted Executive Functions: A Randomized Controlled Trial. J Frailty Aging 9, 179–184 (2020). https://doi.org/10.14283/jfa.2020.23

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