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Samenvatting Hoofdstuk 8.2 - Respiratory Response to Acute Exercise

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Samenvatting hoofdstuk 8.2

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INSPANNINGSFYSIOLOGIE
HOC 08.2: RESPIRATOIRE RESPONSEN BIJ ACUTE INSPANNING


Respiratoire respons bij acute inspanning

Ergospirometer

Meten van:
- Zuurstofopname (VO2)
- Koolstofdioxide (VCO2)
- Teugvolume (TV)
- Ademahlingsfrequentie (f)


Berekenen van:
- VO2max
- RQ/RER
- Ventilatie (in 1 min) (VE)
- Ventilatoire drempel (Tvent)
- VE/VO2 en VE/VCO2
- Zuurstofopname efficiëntie helling (OUES)


VE (pulmonaire ventilatie)

Ventilatie = teugvolume (TV) x ademhalingsfrequentie (f)

Onmiddellijk ­ in ventilatie
- Begint vóór spiercontractie
- Anticiperend antwoord van centrale opdracht

Geleidelijke tweede fase van ­ in ventilatie
- Gedreven door chemische veranderingen in arterieel bloed
- ­ CO2 en H + waargenomen door chemoreceptoren
- Rechter atrium rekreceptoren


Ventilatoire responsen bij inspanning – (submaximale) steady state inspanning

Vb: 11 km/u lopen, 60% VO2max

VE ­evenredig met de metabolische behoefte aan spieren
- @ lage trainingsintensiteit: alleen teugvolume ­
- @ hoge trainingsintensiteit: ademhalingssnelheid ook ­



1

, Herstel van ventilatie na uitgestelde training
- Herstel duurt enkele minuten
- Kan worden geregeld door bloed-pH, PCO2 en temperatuur




Ventilatoire responsen bij inspanning – VO2 en VE - ­ inspanningsintensiteit

Vb: maximale inspanningstest: start aan 80W + 30W/3min




Cardiale en ventilatoire processen zijn erg met elkaar gelinkt.


Minuutventilatie (VE)
à maximale inspanning met ­ intensiteit

- Als het werkpercentage hoger is dan 55% tot 70% VO2max, moet extra energie
afkomstig zijn van glycolyse (vorming lactaat en H +)
- Glycolyse → ­ CO2-waarden à veroorzaakt ademhaling à ­ ventilatie
- VE reageert beter op eisen voor CO2-verwijdering dan O2-opname


In tegenstelling tot hartfrequentie (continue stijgende hartfrequentie bij stijgende intensiteit),
heb je bij ventilatie wel een knikpunt in die stijgende rechte.


2

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