테아닌(L-theanine) 섭취가 Ergometer 운동 후 뇌파에 미치는 영향 (The Effects of L-theanine on Alpha-band Oscillatory Brain Activity and Heart Rate Variability during Incremental Ergometer Exercise)

서지정보

· 발행기관 : 한국사회체육학회
· 수록지 정보 : 한국사회체육학회지 / 72호 / 461 ~ 472페이지
· 저자명 : 김성대, 오명진, 정일규

초록

Ingestion of the nonproteinic amino acid L-theanine (γ-glutamylethylamide) has been shown to influence oscillatory brain activity in the alpha band (8-13 Hz) in humans during resting electroencephalographic (EEG) recordings and also during incremental ergometer exercise. To our knowledge, there is no study using EEG · HRV to determine the combined effects of L-theanine ingestion plus exercise. The purpose of the study is to investigate the effects of L-theanine on alpha-band oscillatory brain activity during an incremental ergometer exercise. EEG data were recorded from twelve neurologicayll normal individuals (20.5±1.0years) while engaging in an incremental exercise task. Participants underwent testing on two separate days, ingesting either a 200-mg colorless and tasteless solution of L-theanine mixed with water, or a water-based solution placebo on each day in counterbalanced order. The parameters of heart rate variability were obtained from both timeand frequency domain analysis of 5min ECG recording at rest, immediately after exercise, and recovery 15min.
We compared the alpha-band activity measured in two conditions :when subjects ingested L-theanine vs .
Placebo. The results were as follows. 1. Alpha power (absolute )of Fp2, F3, P3, and P4 region in -Ltheanine group was lower than that in placebo group at recovery 15min (<p.1). 2. Beta activity (relative) of T3 · T 4 region in L-theanine group was higher than that in placebo gropu at recovery 15min (p<.1). 3. Analysis of HRV revealed a significant increase in sympathetic activity and a significant decrease in parasympathetic activity following ergometer exercise with no significant difference bewt een both groups. These results suggest tha t L-theanine ingestion may have a different neurophysiological porfile after incremental exercise compared to placebo.

영어초록

Ingestion of the nonproteinic amino acid L-theanine (γ-glutamylethylamide) has been shown to influence oscillatory brain activity in the alpha band (8-13 Hz) in humans during resting electroencephalographic (EEG) recordings and also during incremental ergometer exercise. To our knowledge, there is no study using EEG · HRV to determine the combined effects of L-theanine ingestion plus exercise. The purpose of the study is to investigate the effects of L-theanine on alpha-band oscillatory brain activity during an incremental ergometer exercise. EEG data were recorded from twelve neurologicayll normal individuals (20.5±1.0years) while engaging in an incremental exercise task. Participants underwent testing on two separate days, ingesting either a 200-mg colorless and tasteless solution of L-theanine mixed with water, or a water-based solution placebo on each day in counterbalanced order. The parameters of heart rate variability were obtained from both timeand frequency domain analysis of 5min ECG recording at rest, immediately after exercise, and recovery 15min.
We compared the alpha-band activity measured in two conditions :when subjects ingested L-theanine vs .
Placebo. The results were as follows. 1. Alpha power (absolute )of Fp2, F3, P3, and P4 region in -Ltheanine group was lower than that in placebo group at recovery 15min (<p.1). 2. Beta activity (relative) of T3 · T 4 region in L-theanine group was higher than that in placebo gropu at recovery 15min (p<.1). 3. Analysis of HRV revealed a significant increase in sympathetic activity and a significant decrease in parasympathetic activity following ergometer exercise with no significant difference bewt een both groups. These results suggest tha t L-theanine ingestion may have a different neurophysiological porfile after incremental exercise compared to placebo.

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