Loring S H, Mead J
J Appl Physiol Respir Environ Exerc Physiol. 1982 Mar;52(3):700-4. doi: 10.1152/jappl.1982.52.3.700.
Although there is electromyographic evidence for abdominal muscle activity during quiet breathing in standing subjects, several studies have shown, or assumed, that subjects normally breathe on their relaxation characteristics. This latter observation would by itself suggest that abdominal muscles do not contract during quiet breathing. To test this assumption we observed abdominal and rib cage displacements with magnetometers in 17 uninformed subjects. During quiet breathing most subjects showed evidence of tonic or phasic abdominal muscle contraction while standing and sitting but not supine. Subjects studied during hyperpnea immediately following exercise-showed evidence of greater abdominal muscle contraction than at rest. We conclude that most subjects standing at rest normally contract their abdominal muscles.
尽管有肌电图证据表明站立受试者在安静呼吸时有腹部肌肉活动，但多项研究已经表明或假设，受试者通常根据其放松特征进行呼吸。后一种观察结果本身就表明，安静呼吸时腹部肌肉不会收缩。为了验证这一假设，我们用磁力计观察了17名不知情受试者的腹部和胸廓位移。在安静呼吸时，大多数受试者在站立和坐着时显示出强直性或阶段性腹部肌肉收缩的证据，但仰卧时没有。在运动后紧接着的深呼吸期间进行研究的受试者显示出比休息时更大的腹部肌肉收缩证据。我们得出结论，大多数静息站立的受试者通常会收缩其腹部肌肉。
