Exploring the Functional Brain Activity of Motor Control of Abdominal Muscle Associated with Voluntary Voiding Based on Functional Near-Infrared Spectroscopy
Objective The contractions of abdominal muscle during voluntary urination is a motor control task,Which aims to explore the central activity characteristics of this action with functional near-infrared spectroscopy(fNIRS).Methods A total of 19 healthy subjects aged 18 years or older were recruited to undergo fNIRS testing twice,performing repetitive abdominal muscle contractions in the no-urine and strong-urine states.Brain activity under the corresponding no-abdominal muscle-contraction task was used as a baseline to analyze the cortical activities specific to abdominal muscle contractions in these two different states.Re-sults Abdominal muscle contractions during the strong desire to urinate primarily activated the bilateral pre-motor/supplementary motor area(BA6),bilateral dorsolateral prefrontal cortex(BA9/46),bilateral frontal pole area(BA10),the anterior portion of the right inferior frontal gyrus(BA47),the right middle temporal gyrus(BA21),the right primary motor cortex(BA4),and the left primary somatosensory cortex(BA1/2/3)in conjunction with the left inferior frontal of pars triangularis Broca's area(BA45)(P<0.05).In contrast,abdominal muscle contractions with no desire to urinate primarily activated the bilateral pre-motor/supplementary motor area(BA6)(P<0.05),the right primary motor cortex(BA4),the right primary somatosensory cortex(BA1/2/3),the right infe-rior frontal of pars triangularis Broca's area(BA45),and the right supramarginal gyrus part of Wernicke's area(BA40)(P<0.05).Compared to the strong urination state,stronger activation of the bilateral premotor/assistive motor area(BA6)was present in the non-urination state(P<0.05).Compared to the non-urination state,stronger activation of the left dorsolateral prefrontal cortex(BA46)was present in the strong urination state(P<0.05).Conclusion The primary somatosensory cortex,primary motor cortex,and pre-motor/supplementary motor area are jointly involved in the regulation of voluntary urination-associated random abdominal muscle contractions.And further activation of the prefrontal cortex can be induced during abdominal muscle contractions in the strong urination state,suggesting that the prefrontal cortex plays a positive role in facilitating abdominal muscle movements and ini-tiating urination following the perception of urinary awareness.
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