EFFECTS OF THE BREATHING MODE CHARACTERIZED BY PROLONGED EXPIRATION ON RESPIRATORY AND CARDIOVASCULAR RESPONSES AND AUTONOMIC NERVOUS ACTIVITY DURING THE EXERCISE
- VernacularTitle:運動時の呼気延長呼吸が呼吸循環応答と自律神経活動に与える影響
- Author:
TAKUYA MATSUMOTO
;
ATSUHIKO MATSUNAGA
;
MIYAKO HARA
;
MASAKAZU SAITOH
;
RYUSUKE YONEZAWA
;
AKIRA ISHII
;
TOSHIKI KUTSUNA
;
KAZUYA YAMAMOTO
;
TAKASHI MASUDA
- Publication Type:Journal Article
- Keywords:
prolonged expiration;
autonomic nervous activity;
exercise;
heart rate variability;
cardiovascular response
- From:Japanese Journal of Physical Fitness and Sports Medicine
2008;57(3):315-326
- CountryJapan
- Language:Japanese
-
Abstract:
PURPOSE : The purpose of this study was to clarify the effects of prolonged expiration (PE) on respiratory and cardiovascular responses and autonomic nervous activity during the exercise.METHODS : Twenty-five healthy men (22±1years) were classified according to the breathing mode during the exercise : 2-second inspiration and 4-second expiration in 1 : 2 group, 3-second inspiration and 3-second expiration in 1 : 1 group and normal breathing in control group. The 6-minute exercise was performed at anaerobic threshold (AT) and 60%AT using a cycle ergometer as an exercise protocol. Respiratory rate (RR) and tidal volume (TV) were measured by the expired gas analysis. The power of low- (LF) and high-frequency components (HF) was analyzed from a Holter electrocardiogram to assess the heart rate variability. RESULTS : RR and LF/HF were significantly lower, TV and HF were significantly higher during the exercise of 60%AT and AT in the 1 : 1 and 1 : 2 groups than in the control group (P<0.05 or P<0.01). The increase of HR was significantly lower and that of HF was significantly higher during the exercise at 60%AT in the 1 : 2 group than in the 1 : 1 group (P<0.05). CONCLUSION : PE activated the parasympathetic nervous activity and consequently restrained an excessive increase of HR during the exercise at 60%AT.
