Ch14 Pt2 Flashcards
Ventilatory Equivalent can reach what?
35-40L of O2 consumed
OBLA Deeper breakdown
Onset of Blood Lactate Accumulation
-when blood lactate concentration increases above 4.0mM -distinct measurement
-very trainable factor
cause of OBLA?
Controversial
-blood lactate values do not necessarily represent onset on anaerobic metabolism
-could be decreased lactate clearance -capillary action increase
-decreased blood O2 levels -hemoglobin
-decreased blood flow to muscles
Lactate Threshold/ OBLA are influenced by: (4)
Muscle fiber type (anaerobic, aerobic)
Capillary density -deliver O2 to blood and clears lactic acid
Mitochondrial density and size -muscle uptaking more O2 (avo2)
Enzyme Concentration (Lactate dehydrogenate)
Lactate threshold is the highest VO2 at or below:
A 1.0 mM/L increase in blood lactate
Trainable factors at the muscle (metabolism, vascular factors, etc) that would influence Lactate Threshold?
Muscle fibers type, capillary density, fat storage, capillarization clearance
Possible cause of OBLA:
Decreased blood lactate, decreased blood O2 levels, decreased blood flow to muscles
Order of Occurence for OBLA, Ventilatory thresholds and Lactate thresholds:
- Lactate Threshold: increase in ventilation is a response to the increase in lactic acid
-lowers blood pH - Ventilatory thresholds
- OBLA
3 Phases of Respiratory response to Exercise
- Neurogenic, central command in cerebral cortex =rapid response
- Slower expoensntial rise to reach steady-state (20s after initiation)
- Fine tuning of steady state ventilation
Static exercise 3 phases
Similar to low endurance exercise, but has no 3-phase
Sex differences in respiration
Lung volumes and capacities smaller in females than males
-due to smaller size, more breast tissue
Females have higher breathing frequency and lower TV than males at same ventilation
