APRL動作的腦電波分析

Eeg Analysis during Spatial Disorientation with and Without Yelling Maneuver

郭博昭(Bo-Jan Kuo) ； 陳建良(Chien-Liang Chen) ； 陳曉瑩(Hsiao-Ying Chen) ； 溫德生(Te-Sheng Wen)

《中華民國航空醫學暨科學期刊》 18卷2期 (2004/12) Pp. 91-99

https://doi.org/10.7011/JAMSRC.200412.0091

摘要

Introduction: APRL maneuver is repeated yelling ”Er” (＞120 dB) during experiencing spatial disorientation (SD), which was previously developed by our laboratory. The preliminary study has evidenced its awakening effect on the recovery time from vestibular illusions induced by Vertifuge. To investigate the underlying mechanism, we repeated some experiments and analyzed the EEG recording. Methods: Twenty-five male subjects participated to run Vertifuge profiles. They were randomly exposed to resultant vectors generating while cockpit positioned head-in, head-out and head-tangential. A portable EEG recorder was secured on the waist of the subject with three electrodes placed on his skull. For a given ride the subject was instructed to yell (exp.) or not yell (control) at the onset of SD. For each EEG channel a discrete Fourier transform was computed using a fast Fourier alogrithm. From which mean power frequency (MPF), mean slope of MPF, and max. increase in MPF during SD onset period (6(superscript th)~10(superscript th) sec after running) were quantified. These measures were based upon the characteristic of arousal and sleep EEG's, i.e., higher MPF for arousal arid lower MPF for drowsiness. Results: Yelling significantly shortened recovery time from SD scenario (head-in: 8.58±0.44＜15.21±0.86; head-out: 8.68±0.28＜18.09±1.18; head-tangential: 14.72±1.46＜16.21±1.11, in see). Mostly, MPF's at sec (halfway of SD onset) were significantly greater with yelling than without yelling (head-in: 14.13±0.85＞9.47±0.53; head-out: 15.10±0.67＞8.03±0.58, in Hz). The corresponding figures for mean slopes of MPF were higher in both head-in and head-tangential profiles with yelling (0.61±0.43＞-1.17±0.18; 0.92±0.47＞0.02±0.37, in Hz/s). The data also showed that higher max. increase in MPF existed in all profiles while yelling (head-in: 5.21±0.46＞2.83±0.64; head-out: 5.06±0.69＞3.60±0.79; head-tangential: 7.01±0.59＞4.76±0.66, in Hz). Conclusion: The results of this study indicate that yelling can lead to the activation of EEG. These bioelectrical changes may facilitate the earlier recovery form SD scenario.

關鍵字

腦電波 ； 平均波頓 ； 空間迷向 ； APRL動作

並列摘要

Introduction: APRL maneuver is repeated yelling ”Er” (＞120 dB) during experiencing spatial disorientation (SD), which was previously developed by our laboratory. The preliminary study has evidenced its awakening effect on the recovery time from vestibular illusions induced by Vertifuge. To investigate the underlying mechanism, we repeated some experiments and analyzed the EEG recording. Methods: Twenty-five male subjects participated to run Vertifuge profiles. They were randomly exposed to resultant vectors generating while cockpit positioned head-in, head-out and head-tangential. A portable EEG recorder was secured on the waist of the subject with three electrodes placed on his skull. For a given ride the subject was instructed to yell (exp.) or not yell (control) at the onset of SD. For each EEG channel a discrete Fourier transform was computed using a fast Fourier alogrithm. From which mean power frequency (MPF), mean slope of MPF, and max. increase in MPF during SD onset period (6(superscript th)~10(superscript th) sec after running) were quantified. These measures were based upon the characteristic of arousal and sleep EEG's, i.e., higher MPF for arousal arid lower MPF for drowsiness. Results: Yelling significantly shortened recovery time from SD scenario (head-in: 8.58±0.44＜15.21±0.86; head-out: 8.68±0.28＜18.09±1.18; head-tangential: 14.72±1.46＜16.21±1.11, in see). Mostly, MPF's at sec (halfway of SD onset) were significantly greater with yelling than without yelling (head-in: 14.13±0.85＞9.47±0.53; head-out: 15.10±0.67＞8.03±0.58, in Hz). The corresponding figures for mean slopes of MPF were higher in both head-in and head-tangential profiles with yelling (0.61±0.43＞-1.17±0.18; 0.92±0.47＞0.02±0.37, in Hz/s). The data also showed that higher max. increase in MPF existed in all profiles while yelling (head-in: 5.21±0.46＞2.83±0.64; head-out: 5.06±0.69＞3.60±0.79; head-tangential: 7.01±0.59＞4.76±0.66, in Hz). Conclusion: The results of this study indicate that yelling can lead to the activation of EEG. These bioelectrical changes may facilitate the earlier recovery form SD scenario.

並列關鍵字

EEG ； mean power frequency ； spatial disorientation ； APRL maneuver