Evaluation of tissue oxygen saturation of the masseter muscle during standardised teeth clenching

Autor: Akira Nishiyama, Satoshi Kokai, Chiho Satokawa, Takashi Ono, Katsuhiko Suzuki, Shunsuke Uesugi
Rok vydání: 2019
Předmět:
Zdroj: Journal of Oral Rehabilitation. 47:19-26
ISSN: 1365-2842
0305-182X
DOI: 10.1111/joor.12863
Popis: BACKGROUND Haemodynamics during recovery after teeth clenching is poorly understood. OBJECTIVE To clarify factors influencing tissue blood oxygenation recovery after clenching with altered muscle activity and duration, but constant total muscle activity. METHODS The following tasks were based on constant maximum voluntary clenching (100% MVC): (a) 50% MVC × 30 seconds; (b) 30% MVC × 50 seconds; and (c) 10% MVC × 150 seconds. Tissue oxygenated (oxy-Hb), deoxygenated (deoxy-Hb) and total haemoglobin (total-Hb) were recorded using near-infrared spectroscopy in the masseter muscle during recovery after each task. Participants rested for 30 seconds before each task; average resting values were set as baseline. Respective ratios to baseline at 20, 60, 120 and 180 seconds after each task were calculated; the tasks were compared at each time point using one-way repeated-measures ANOVA. RESULTS Oxy-Hb and total-Hb decreased and deoxy-Hb increased during the tasks and recovered thereafter. For Task 3, not all values recovered to baseline, even after 180 seconds (oxy-Hb: 96.85%, total-Hb: 98.31%, deoxy-Hb: 102.98%). Oxy-Hb (after 180 seconds, Task 1-Task 3: P
Databáze: OpenAIRE
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