The sternal part lowers the costal cartilages, facilitating inhalation by expanding the chest cavity.Dysfunction in the diaphragm can result in disruptions in esophageal motility and add to gastroesophageal reflux condition (GERD).Máy b?m màng th?y l?c ho?t ??ng t??ng t? nh? cách máy b?m d?ng c? h?c v?n hành, nh?ng ch?t l?ng s? ti?p xúc tr?c