Kinesiology 2230A/B Lecture Notes - Lecture 6: Lactate Threshold, Peripheral Chemoreceptors, Vapor Pressure

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Published on 12 Apr 2013
School
Western University
Department
Kinesiology
Course
Kinesiology 2230A/B
Professor
Oct. 24
Lecture 6
- The greater the number of particles in the air, the greater water vapour pressure
- Condensation: transition from vapour to liquid
- T drops- capacity of air to hold water vapour drops PH2O drops
- Avg energy of particles in fluid governed by T
o Greater TOC greater the energy
o Some particles have energy greater than avg
o These can escape from attractive forces holding liquid together (evap)
Last Day
Respiratory regulation
- Nervous messaging from active muscles, nerve outflow sent to inspiratory centre increasing
breathing frequency, increase ventilation
- At rest, stretch receptors monitor change in stretch and down regulate ventilation
- Peripheral chemoreceptors: PO2, PCO2, pH
Estimating Lactate Threshold
- CO2 production occurring faster than O2 consumption
- Hit LT, increase in ventilation is greater than O2 consumption
o Something else driving ventilation compared to O2 consumption
- VCO2/VO2
o Early in exercise, CO2 production and O2 consumption equal
Ventilation During Exercise
- Anaerobic threshold I when Ve/VO2 increases with increases in Ve/VCO2 and VCO2/VO2
- Ventilator, anaerobic and lactate thresholds all occur at about the same point
Work Rate
- Looking at how much CO2/O2 is in one particular breath
- WR starts, increase in ventilation, CO2 production and O2 consumption
o Below ventilator threshold
- Ventilation goes from linear increase to non-linear as power output increases
o CO2 same pattern
o No change of CO2 concentration within blood
Whatever you are producing, able to blow it off when breathing increases
- Ve/VCO2: very little change
- VO2 consumption remains linear increase
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Document Summary

The greater the number of particles in the air, the greater water vapour pressure. Avg energy of particles in fluid governed by t. T drops- capacity of air to hold water vapour drops ph2o drops: greater toc greater the energy, some particles have energy greater than avg, these can escape from attractive forces holding liquid together (evap) Nervous messaging from active muscles, nerve outflow sent to inspiratory centre increasing breathing frequency, increase ventilation. At rest, stretch receptors monitor change in stretch and down regulate ventilation. Co2 production occurring faster than o2 consumption. Hit lt, increase in ventilation is greater than o2 consumption: something else driving ventilation compared to o2 consumption. Vco2/vo2: early in exercise, co2 production and o2 consumption equal. Anaerobic threshold i when ve/vo2 increases with increases in ve/vco2 and vco2/vo2. Ventilator, anaerobic and lactate thresholds all occur at about the same point. Looking at how much co2/o2 is in one particular breath.

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