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2 results on '"hand motor hot spot"'

1. Comparison of hemodynamic changes after repetitive transcranial magnetic stimulation over the anatomical hand knob and hand motor hotspot: A functional near-infrared spectroscopy study.

Author

Kim, Jinuk, Kim, Heegoo, Lee, Jungsoo, Lee, Hwang-Jae, Na, Yoonju, Chang, Won Hyuk, and Kim, Yun-Hee

Subjects
*TRANSCRANIAL magnetic stimulation, *NEAR infrared spectroscopy, *HEMODYNAMICS, *TIME series analysis, *MOTOR cortex
Abstract

Background: Low-frequency rTMS can induce upregulation of excitability in the contralateral hemisphere by interhemispheric interaction. Objective: The aim of this study was to compare the effects of interhemispheric modulation on hemodynamic changes after applying low-frequency rTMS over the anatomical hand knob (HK) and the hand motor hotspot (hMHS) in the dominant motor cortex. Methods: Ten healthy right-handed participants without a history of neurological or psychiatric symptoms (five males; 29.8±2.8 years) participated in this single-blind, randomized, cross-over study. rTMS was applied under three conditions over the dominant (left) hemisphere for 20 minutes: 1) 1 Hz rTMS stimulation on the HK (HK-rTMS), 2) 1 Hz rTMS stimulation on the hMHS (hMHS-rTMS), and 3) sham stimulation (Sham-rTMS). For all participants, functional near-infrared spectroscopy (fNIRS) was applied for measurement of cerebral oxyhemoglobin (oxyHb) and deoxyhemoglobin (deoxyHb) concentration over the non-dominant (right) hemisphere during a serial reaction time task (SRTT) with the non-dominant (left) hand before and after each condition. Results: The average coordinates of the hMHS (x = – 39.60 mm, y = – 17.11 mm, z = 66.40 mm) were anterior and lateral to the HK (x = – 36.72 mm, y = – 28.87 mm, z = 56.41 mm). In fNIRS time-series analysis, the integral value of oxyHb was significantly increased over the motor cortical region of the non-dominant hemisphere after the hMHS-rTMS compared with Sham-rTMS. The HK-rTMS also showed slight increment of oxyHb concentration but without statistical significance. The SPM group analysis showed greater magnitude of the activity in hMHS-rTMS than that of HK-rTMS after stimulation (p < 0.05). Conclusions: These results demonstrated an interhemispheric modulation effect of hemodynamic changes by 1 Hz rTMS. The hMHS produced a more robust modulation effect of 1 Hz rTMS on the contralateral hemisphere than did the HK. Therefore, the rTMS can be considered a better stimulation target than the HK. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Comparison of hemodynamic changes after repetitive transcranial magnetic stimulation over the anatomical hand knob and hand motor hotspot: A functional near-infrared spectroscopy study

Author

Won Hyuk Chang, Heegoo Kim, Hwang-Jae Lee, Jinuk Kim, Jung-Soo Lee, Yun-Hee Kim, and Yoonju Na

Subjects
Serial reaction time, Adult, Male, medicine.medical_specialty, Modulation effect, medicine.medical_treatment, hand knob, Hemodynamics, Stimulation, Interhemispheric modulation, behavioral disciplines and activities, hand motor hot spot, 050105 experimental psychology, 03 medical and health sciences, 0302 clinical medicine, Developmental Neuroscience, Near-infrared spectroscopy, Internal medicine, mental disorders, Medicine, Humans, 0501 psychology and cognitive sciences, Single-Blind Method, Cross-Over Studies, Spectroscopy, Near-Infrared, business.industry, musculoskeletal, neural, and ocular physiology, 05 social sciences, Contralateral hemisphere, Motor Cortex, Evoked Potentials, Motor, Hand, Transcranial Magnetic Stimulation, Transcranial magnetic stimulation, medicine.anatomical_structure, Neurology, nervous system, Cardiology, Functional near-infrared spectroscopy, Female, Neurology (clinical), business, 030217 neurology & neurosurgery, psychological phenomena and processes, Motor cortex, Research Article
Abstract

Background: Low-frequency rTMS can induce upregulation of excitability in the contralateral hemisphere by interhemispheric interaction. Objective: The aim of this study was to compare the effects of interhemispheric modulation on hemodynamic changes after applying low-frequency rTMS over the anatomical hand knob (HK) and the hand motor hotspot (hMHS) in the dominant motor cortex. Methods: Ten healthy right-handed participants without a history of neurological or psychiatric symptoms (five males; 29.8±2.8 years) participated in this single-blind, randomized, cross-over study. rTMS was applied under three conditions over the dominant (left) hemisphere for 20 minutes: 1) 1 Hz rTMS stimulation on the HK (HK-rTMS), 2) 1 Hz rTMS stimulation on the hMHS (hMHS-rTMS), and 3) sham stimulation (Sham-rTMS). For all participants, functional near-infrared spectroscopy (fNIRS) was applied for measurement of cerebral oxyhemoglobin (oxyHb) and deoxyhemoglobin (deoxyHb) concentration over the non-dominant (right) hemisphere during a serial reaction time task (SRTT) with the non-dominant (left) hand before and after each condition. Results: The average coordinates of the hMHS (x = – 39.60 mm, y = – 17.11 mm, z = 66.40 mm) were anterior and lateral to the HK (x = – 36.72 mm, y = – 28.87 mm, z = 56.41 mm). In fNIRS time-series analysis, the integral value of oxyHb was significantly increased over the motor cortical region of the non-dominant hemisphere after the hMHS-rTMS compared with Sham-rTMS. The HK-rTMS also showed slight increment of oxyHb concentration but without statistical significance. The SPM group analysis showed greater magnitude of the activity in hMHS-rTMS than that of HK-rTMS after stimulation (p

Published
2020

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