The Study On Metabolic Characteristics Of Partial Skeletal Muscle Oxygen By Near-Infrared Spectroscopy Detection

Introduction:Research on the relative change between inflection points of respiratory quotient (RQ) and HbO2 in skeletal muscle during the process of increased intensity sports. Compare the occurrence priority and interval regularity of the two based on time, and analyze the physiological mechanism of synchronisms.Methods:12 rowing athlete candidates are chose to test to do increased intensity sports on dynamometer (CONCEPT-II). The output power of initial load is 50W, and then increased by 50W every 3 minutes until exhaustive. Monitor the relative changes of HbO2 in Quadriceps by Near-Infrared Spectroscopy (NIRS) during sports.Simultaneously determine and record the oxygen uptake of candidates in sports, including the intake of oxygen (VO2) and exhaled volume of carbon dioxide (VCO2), by the Cardiopulmonary Function Instrument MAX-II.Results:The inflection point of RQ is relatively changing toΔHbO2. That means there is a time delay in RQ. The delay in VO2 and VCO2 relative to HbO2, which is affirmed in the single-factor variance analysis test, is do exist.Conclusion:During increased intensity sports, the respiratory quotient changes regularly accompanied with the inflection point, and content of muscle oxygen (ΔHbO2) in quadriceps changes regularly with unconventional inflection point which might denote that of respiratory quotient. Inflection point of respiratory quotient has a regular delay time relative to that ofΔHbO2. The phenomenon provides powerful evidence for us to speculate inflection point of respiratory quotient by measuringΔHbO2 in Muscle-Oxygen Monitoring System. It may provide new methods to measure oxygen uptake.