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Open AccessArticle

The Effects of Botulinum Toxin Injections on Spasticity and Motor Performance in Chronic Stroke with Spastic Hemiplegia

1
Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
2
TIRR Memorial Hermann Hospital, Houston, TX 77030, USA
3
Department of Health and Kinesiology, Northeastern State University, Broken Arrow, OK 74014, USA
4
Department of Biomedical Engineering, University of Houston, Houston, TX 77204, USA
5
Department of Rehabilitation Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
6
Guangdong Provincial Work Injury Rehabilitation Center, Guangzhou 510000, China
*
Author to whom correspondence should be addressed.
Both authors contributed equally.
Toxins 2020, 12(8), 492; https://doi.org/10.3390/toxins12080492
Received: 15 June 2020 / Revised: 25 July 2020 / Accepted: 27 July 2020 / Published: 31 July 2020
Spastic muscles are weak muscles. It is known that muscle weakness is linked to poor motor performance. Botulinum neurotoxin (BoNT) injections are considered as the first-line treatment for focal spasticity. The purpose of this study was to quantitatively investigate the effects of BoNT injections on force control of spastic biceps brachii muscles in stroke survivors. Ten stroke survivors with spastic hemiplegia (51.7 ± 11.5 yrs; 5 men) who received 100 units of incobotulinumtoxinA or onabotulinumtoxinA to the biceps brachii muscles participated in this study. Spasticity assessment (Modified Ashworth Scale (MAS) and reflex torque) and muscle strength of elbow flexors, as well as motor performance assessment (force variability of submaximal elbow flexion) were performed within one week before (pre-injection) and 3~4 weeks (3-wk) after BoNT injections. As expected, BoNT injections reduced the MAS score and reflex torque, and elbow flexor strength on the spastic paretic side. However, motor performance remained within similar level before and after injections. There was no change in muscle strength or motor performance on the contralateral arm after BoNT injections. The results of this study provide evidence that BoNT injections can reduce spasticity and muscle strength, while motor performance of the weakened spastic muscle remains unchanged. View Full-Text
Keywords: botulinum toxin; spasticity; stroke; motor control; force variability; motor performance botulinum toxin; spasticity; stroke; motor control; force variability; motor performance
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MDPI and ACS Style

Chen, Y.-T.; Zhang, C.; Liu, Y.; Magat, E.; Verduzco-Gutierrez, M.; Francisco, G.E.; Zhou, P.; Zhang, Y.; Li, S. The Effects of Botulinum Toxin Injections on Spasticity and Motor Performance in Chronic Stroke with Spastic Hemiplegia. Toxins 2020, 12, 492. https://doi.org/10.3390/toxins12080492

AMA Style

Chen Y-T, Zhang C, Liu Y, Magat E, Verduzco-Gutierrez M, Francisco GE, Zhou P, Zhang Y, Li S. The Effects of Botulinum Toxin Injections on Spasticity and Motor Performance in Chronic Stroke with Spastic Hemiplegia. Toxins. 2020; 12(8):492. https://doi.org/10.3390/toxins12080492

Chicago/Turabian Style

Chen, Yen-Ting; Zhang, Chuan; Liu, Yang; Magat, Elaine; Verduzco-Gutierrez, Monica; Francisco, Gerard E.; Zhou, Ping; Zhang, Yingchun; Li, Sheng. 2020. "The Effects of Botulinum Toxin Injections on Spasticity and Motor Performance in Chronic Stroke with Spastic Hemiplegia" Toxins 12, no. 8: 492. https://doi.org/10.3390/toxins12080492

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