نتایج جستجو برای: breathing
تعداد نتایج: 29872 فیلتر نتایج به سال:
Heart rate variability (HRV), the beat-to-beat alterations in heart rate, comprises sympathetic and parasympathetic nerve activities of the heart. HRV analysis is used to quantify cardiac autonomic regulation. Since respiration could be a confounding factor in HRV evaluation, some studies recommend consciously controlled breathing to standardize the method. However, it remains unclear whether c...
Background and aims: Polycyclic aromatic hydrocarbons (PAHs) are a group of organic compounds that are produced during the incomplete combustion of fossil fuels and petroleum products and are widely spread in the environment. Newsagents may be exposed to urban pollutions such as polycyclic aromatic hydrocarbons. The aim of this study was to assess the breathing zone exposure of newsagents to ...
We examined the effect of oral breathing on respiratory movements, including the number of respirations and the movement of the thoracic wall at rest and while chewing gum. Forty normal nose breathers were selected by detecting expiratory airflow from the mouth using a CO2 sensor. Chest measurements were recorded using a Piezo respiratory belt transducer, and electromyographic (EMG) activity of...
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