QS Study

Regulation of respiration

During exercise, the rate of respiration increase. It controlled by both neural and chemical mechanism. During exercise, the increase in ventilation which occurs to meet the increased oxygen demands is not fully explained by the control of the peripheral or central chemoreceptors alone. There are non-chemical controls of ventilation that are required to supply input to the respiratory center to increase ventilation, particularly during the initiation of exercise when ventilation needs to increase rapidly.

Fig: Regulation of respiration

Regulation of Respiration during Exercise –

  • Nervous factor

Direct stimulation of respiratory centre from the motor cortex. During exercise, the brain transmitting impulse to the contracting mode also transmits the collateral impulse to the respiratory centre. This stimulation of respiratory centre increases the rate of respiration.

  • Indirect stimulation from proprioceptors

During exercise movement of the joints is body excites the proprioceptors. This then transmits an impulse to the respiratory center which in turn increases respiration.

  • Hypoxia

During exercise, hypoxia develops in the much that elicit afferent nerve signal increase the respiration.

  • Chemical factor (Stimulation caused by chemical substances)

During exercise, the PCO2 increase and PO2 decrease due to excess metabolism in the cell. This then stimulates a chemosensitive area of the brain and peripheral. Chemoreceptor system so thus ↑ rate of respiration.