Speech Therapy Changes Blood Circulation and Oxygenation in the Brain and Muscle

Wolf, Martin; Bonin, Dietrich von; Wolf, Ursula

doi:10.1007/978-1-4419-7756-4_4

Cited by 5 publications

(11 citation statements)

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“…In particular, we demonstrated that during speech exercises, a decrease in cerebral hemodynamics and oxygenation occurred. We hypothesized that this effect might be the result of a decrease in the partial pressure of carbon dioxide in the arterial blood (PaCO2) during speaking [5,6]. This hypothesis was confirmed in a subsequent study [4]: we found significant changes in end-tidal CO2 (PETCO2), a reliable and accurate estimate of PaCO2 [7], during all recitation tasks and even during the control task (mental arithmetic).…”

Section: Introductionmentioning

confidence: 68%

“…In previous studies, we showed that guided rhythmic speech exercises in the context of arts speech therapy (AST) cause changes in heart rate variability [1,2], cardiorespiratory interactions [3], as well as hemodynamics and oxygenation in the brain and muscle [4][5][6]. In particular, we demonstrated that during speech exercises, a decrease in cerebral hemodynamics and oxygenation occurred.…”

Section: Introductionmentioning

confidence: 92%

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The Effect of Inner Speech on Arterial CO2 and Cerebral Hemodynamics and Oxygenation: A Functional NIRS Study

Scholkmann

Wolf²,

Wolf

2013

Oxygen Transport to Tissue XXXV

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The aim of the present study was (i) to investigate the effect of inner speech on cerebral hemodynamics and oxygenation, and (ii) to analyze if these changes could be the result of alternations of the arterial carbon dioxide pressure (PaCO2). To this end, in seven adult volunteers, we measured changes of cerebral absolute [O2Hb], [HHb], [tHb] concentrations and tissue oxygen saturation (StO2) (over the left and right anterior prefrontal cortex (PFC)), as well as changes in end-tidal CO2 (PETCO2), a reliable and accurate estimate of PaCO2. Each subject performed three different tasks (inner recitation of hexameter (IRH) or prose (IRP) verses) and a control task (mental arithmetic (MA)) on different days according to a randomized crossover design. Statistical analysis was applied to the differences between pre-baseline, two tasks, and four post-baseline periods. The two brain hemispheres and three tasks were tested separately. During the tasks, we found (i) PETCO2 decreased significantly (p < 0.05) during the IRH ( 3 mmHg) and MA ( 0.5 mmHg) task. (ii) [O2Hb] and StO2 decreased significantly during IRH ( 1.5 M; 2 %), IRP ( 1 M; 1.5 %), and MA ( 1 M; 1.5 %) tasks. During the post-baseline period, [O2Hb] and [tHb] of the left PFC decreased significantly after the IRP and MA task ( 1 M and 2 M, respectively). In conclusion, the study showed that inner speech affects PaCO2, probably due to changes in respiration. Although a decrease in PaCO2 is causing cerebral vasoconstriction and could potentially explain the decreases of [O2Hb] and StO2 during inner speech, the changes in PaCO2 were significantly different between the three tasks (no change in PaCO2 for MA) but led to very similar changes in [O2Hb] and StO2. Thus, the cerebral changes cannot solely be explained by PaCO2. Abstract: The aim of the present study was (i) to investigate the effect of inner speech on cerebral hemodynamics and oxygenation, and (ii) to analyze if these changes could be the result of alternations of the arterial carbon dioxide pressure (Pa-CO2). To this end, in seven adult volunteers, we measured changes of cerebral absolute [O2Hb], [HHb], [tHb] concentrations and tissue oxygen saturation (StO2) (over the left and right anterior prefrontal cortex (PFC)), as well as changes in end-tidal CO2 (PETCO2), a reliable and accurate estimate of PaCO2. Each subject performed three different tasks (inner recitation of hexameter (IRH) or prose (IRP) verses) and a control task (mental arithmetic (MA)) on different days according to a randomized crossover design. Statistical analysis was applied to the differences between pre-baseline, two tasks, and four postbaseline periods. The two brain hemispheres and three tasks were tested separately. During the tasks, we found (i) PETCO2 decreased significantly (p < 0.05) during the IRH (~3 mmHg) and MA (~0.5 mmHg) task. (ii) [O2Hb] and StO2 decreased significantly during IRH (~1.5 μM; ~2 %), IRP (~1 μM; ~1.5 %), and MA (~1 μM; ~1.5 %) tasks. During the post-baseline period, [O2Hb] and [tHb] of t...

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 92%

The Effect of Inner Speech on Arterial CO2 and Cerebral Hemodynamics and Oxygenation: A Functional NIRS Study

Scholkmann

Wolf²,

Wolf

2013

Oxygen Transport to Tissue XXXV

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous studies showed that guided rhythmic speech exercises in the context of arts speech therapy (AST) cause changes in heart rate variability (Bettermann et al, 2002), and cardiorespiratory interactions (Cysarz et al, 2004) as well as blood circulation and oxygenation in the brain and muscle (Wolf et al, 2011a(Wolf et al, , 2011b. In particular we demonstrated that during AST a decrease in cerebral hemodynamics and oxygenation occurred in the prefrontal cortex (PFC) (Wolf et al, 2011a(Wolf et al, , 2011b.…”

Section: Introductionmentioning

confidence: 92%

End-tidal CO2: An important parameter for a correct interpretation in functional brain studies using speech tasks

Scholkmann

Gerber

Wolf³

et al. 2013

NeuroImage

113

105

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“…(3) Signal processing techniques should be developed and applied to distinguish between CO 2 R-related and NCrelated changes in fNIRS signals. (4) In order to investigate the influence of the ANS state on the fNIRS signals, the measurement and analysis of skin conductance and heart rate variability changes during speech tasks might also be important for a proper interpretation of fNIRS signals. In addition, measurements of MBP changes in future studies would contribute to interpreting the fNIRS results.…”

Section: Implications For Further Research On the Topicmentioning

confidence: 99%

“…In a next step, effects on cerebral and systemic changes of hemodynamics and oxygenation were investigated by our research group using functional near-infrared spectroscopy (fNIRS). 3,4 A decrease in cerebral hemodynamics and oxygenation was found to occur during speech exercises, which was hypothesized to be a result of a decrease in the partial pressure of carbon dioxide (CO 2 ) in the arterial blood (PaCO 2 ) during speaking. This hypothesis was confirmed in a subsequent study combining fNIRS and capnography, 5 where we observed changes in end-tidal CO 2 (P ET CO 2 ), a reliable and accurate estimate of PaCO 2 , 6-8 during all speech tasks and even during the control task (mental arithmetic).…”

Section: Introductionmentioning

confidence: 99%

Cerebral hemodynamic and oxygenation changes induced by inner and heard speech: a study combining functional near-infrared spectroscopy and capnography

et al. 2014

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Abstract. The aim of this study was to investigate the effects of inner and heard speech on cerebral hemodynamics and oxygenation in the anterior prefrontal cortex (PFC) using functional near-infrared spectroscopy and to test whether potential effects were caused by alterations in the arterial carbon dioxide pressure (PaCO 2 ). Twenty-nine healthy adult volunteers performed six different tasks of inner and heard speech according to a randomized crossover design. During the tasks, we generally found a decrease in PaCO 2 (only for inner speech), tissue oxygen saturation (StO 2 ), oxyhemoglobin (½O 2 Hb), total hemoglobin ([tHb]) concentration and an increase in deoxyhemoglobin concentration ([HHb]). Furthermore, we found significant relations between changes in ½O 2 Hb, [HHb], [tHb], or StO 2 and the participants' age, the baseline P ET CO 2 , or certain speech tasks. We conclude that changes in breathing during the tasks led to lower PaCO 2 (hypocapnia) for inner speech. During heard speech, no significant changes in PaCO 2 occurred, but the decreases in StO 2 , ½O 2 Hb, and [tHb] suggest that changes in PaCO 2 were also involved here. Different verse types (hexameter and alliteration) led to different changes in [tHb], implying different brain activations. In conclusion, StO 2 , ½O 2 Hb, [HHb], and [tHb] are affected by interplay of both PaCO 2 reactivity and functional brain activity. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Speech Therapy Changes Blood Circulation and Oxygenation in the Brain and Muscle

Cited by 5 publications

References 3 publications

The Effect of Inner Speech on Arterial CO2 and Cerebral Hemodynamics and Oxygenation: A Functional NIRS Study

The Effect of Inner Speech on Arterial CO2 and Cerebral Hemodynamics and Oxygenation: A Functional NIRS Study

End-tidal CO2: An important parameter for a correct interpretation in functional brain studies using speech tasks

Cerebral hemodynamic and oxygenation changes induced by inner and heard speech: a study combining functional near-infrared spectroscopy and capnography

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