Electrophysiology and kinesiology for health and disease

Moritani, Toshio; Kimura, Tetsuya; Hamada, Taku; Nagai, Narumi

doi:10.1016/j.jelekin.2005.01.001

Cited by 37 publications

(49 citation statements)

References 71 publications

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“…The latter was identified where the downward slope of the T wave joins the baseline. The QT interval was measured in the CM 5 lead (Moritani et al, 2005). We present data for QTc using the traditional Bazett formula (QTcϭQT/øRR) (Bazett, 1920).…”

Section: Ecg Qtc-intervalmentioning

confidence: 99%

“…After passage through the Hammingtype data window, power spectral analysis using a fast Fourier transform was performed on a consecutive 1024-second series of R-R interval data obtained during the test. To evaluate activity of the ANS, we analyzed a low frequency (LF) component (0.035-0.15 Hz) jointly regulated by both 42 The Effect of L-citrulline Ingestion on ECG QT Interval and Autonomic Nervous System Activity sympathetic nervous system activity and parasympathetic nervous system activities, and a high frequency (HF) component (0.15-0.4 Hz) that solely reflected parasympathetic nervous system activity by integrating the spectrum for the respective bandwidth (Akselrod et al, 1981;Matsumoto et al, 1999Matsumoto et al, , 2001Moritani et al, 2005).…”

Section: Autonomic Nervous System (Ans)mentioning

confidence: 99%

“…A good blood flow is indispensable for production of ATP to supply oxygen. In our previous study, we measured the cardiac depolarization-repolarization interval by using a CM 5 lead ECG in patients with ischemic heart disease (IHD), and reported that cardiac activation-recovery interval (ARI) and recovery time (RT) significantly increased in IHD patients compared with control subjects (Moritani et al, 2005). This study indicated that the improvement of blood flow might decrease the cardiac depolarization-repolarization interval time.…”

Section: Introductionmentioning

confidence: 98%

“…We therefore attempted to identify new quantitative ECG characteristics of the QTc intervals using a computer algorithm we have recently developed. For instance, we employed the R-wave triggeraveraging technique to obtain averaged electrocardiogram for 30 sec, and determined the QT interval with an accuracy of 1 msec and, which has been shown to provide reliable information about cardiac depolarization-repolarization characteristics in our previous study with patients with diabetes and ischemic heart disease (Moritani et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…However, the effect of L-citrulline ingestion on the ECG QTc interval, which reflects the total duration of ventricular depolarization and repolarization, remained unclear. Accordingly, the purpose of this study was to investigate whether or not L-citrulline ingestion affected myocardial depolarization and repolarization (ECG QTc interval) and autonomic nervous system activity in healthy young males as determined by heart rate variability power spectral analyses (Matsumoto et al, 1999;Moritani et al, 2005), respectively.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of L-citrulline Ingestion on ECG QT Interval and Autonomic Nervous System Activity

Kameda

Okigawa

Kimura

et al. 2011

J Physiol Anthropol

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The purpose of this study was to investigate the effect of L-citrulline ingestion on ECG QT interval. To accomplish this purpose, nine male subjects (age: 23.4Ϯ0.5 years, weight: 57.7Ϯ5.6 kg) participated, who had no history of cardiovascular or respiratory function disorders. Each subject performed two tests (L-citrulline and placebo ingestion) on a separate day. ECG was taken before, and 60 min and 90 min after L-citrulline ingestion. The heart-ratecorrected QT interval (QTc) decreased significantly 60 min ( pϭ0.0004) and 90 min (pϭ0.011) after L-citrulline ingestion. However, there were no significant changes after placebo ingestion. In addition, the interaction between L-citrulline ingestion and placebo was significant (two-way ANOVA: interaction, pϭ0.010). Our major finding was that L-citrulline ingestion decreases the QT interval in healthy subjects. This result suggests that transient L-citrulline ingestion may shorten the time required to complete myocardial depolarization and repolarization.

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Section: Ecg Qtc-intervalmentioning

confidence: 99%

Section: Autonomic Nervous System (Ans)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of L-citrulline Ingestion on ECG QT Interval and Autonomic Nervous System Activity

Kameda

Okigawa

Kimura

et al. 2011

J Physiol Anthropol

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Thermoregulatory sympathetic nervous system activity and diet‐induced waist‐circumference reduction in obese Japanese women

Fujibayashi

Hamada

Matsumoto

et al. 2009

American J Hum Biol

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The present study is designed to investigate how and to what extent sympathovagal behavior in a balanced low-calorie diet relates to favorable changes of body mass, waist circumference, and/or metabolic risk factors. The study involved 28 mildly obese women without clinical complications, who underwent an 8-week calorie restriction program using a 1,200-kcal daily diet with an adequate nutrient content; including two regular meals, and one formula meal replacement. All subjects were examined before and after the dietary intervention. We measured anthropometric parameters, blood pressure, and biochemical blood profiles for lipid metabolism. Autonomic nervous system activity was evaluated by heart rate variability power spectral analysis. The dietary intervention induced moderate, but significant reduction of waist circumference (-5.3% +/- 0.8%), body fat percentage (-5.8% +/- 0.8%), and body mass (-6.6% +/- 0.5%). Linear regression analysis showed that Deltavery low frequency (VLF) power reflecting energy metabolic- and thermoregulatory sympathetic function significantly correlated to Deltawaist circumference (r = -0.53, P < 0.01), Deltabody fat percentage (r = -0.39, P < 0.05), Deltabody mass (r = -0.43, P < 0.05), DeltaHDL-cholesterol/total cholesterol ratio (HDL-C/TC) (r = 0.62, P < 0.001), and Deltanonesterified fatty acids (NEFA) (r = 0.56, P < 0.01). A stepwise multiple regression analysis additionally revealed that Deltawaist circumference (P = 0.024), DeltaHDL-C/TC (P = 0.013), and DeltaNEFA (P = 0.016) were significant and independent factors, which contributing to the variance in DeltaVLF power (r(2) = 0.61). Although causes and consequences of obesity continue to elude researchers, the present study indicates that thermoregulatory sympathetic activity relates to moderate waist-circumference reduction together with favorable changes of blood lipid profiles after short-term dietary modification in mildly obese women.

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The Role of Exercise and Nutrition in Lifestyle-Related Disease

Moritani

2015

Physical Activity, Exercise, Sedentary Behavior and Health

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Electrophysiology and kinesiology for health and disease

Cited by 37 publications

References 71 publications

The Effect of L-citrulline Ingestion on ECG QT Interval and Autonomic Nervous System Activity

The Effect of L-citrulline Ingestion on ECG QT Interval and Autonomic Nervous System Activity

Thermoregulatory sympathetic nervous system activity and diet‐induced waist‐circumference reduction in obese Japanese women

The Role of Exercise and Nutrition in Lifestyle-Related Disease

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