Respiratory responses to exercise part 2

Question 1

Ventilatory threshold

Answer 1

point where pulmonary ventilation increases disproportionately with O2 consumption during graded execise

Question 2

what is ventilatory threshold directly related to?

Answer 2

increased CO2 from buffering lactate

Question 3

what can ventilatory equivalent reach ?

Answer 3

35-40 L per L of O2 consumed

Question 4

OBLA

Answer 4

onset of blood lactate accumulation when blood lactate concentration increases above 4.0mM

Question 5

Lactate threshold

Answer 5

highest VO2 with less than 1.0mM per L increase in blood lactate concentration above pre-exercise levels

Question 6

what is a trainable factor?

Answer 6

OBLA and LActate threshold

Question 7

what are 3 possible reasons for onset of anaerobic metabolism

Answer 7

could be decreased lactate clearance OR blood O2 levels OR blood flow to muscles

Question 8

what is OBLA/lactate threshold strongly related to?

Answer 8

pH changes, increased CO2 and H+ and bicarbonate

Question 9

why can’t you call OBLA and lactate threshold the same thing in different exercise modes or fitness levels?

Answer 9

specificity aspect

different muscles may be trained differently

Question 10

what 4 “trainable” factors influence lactate threshold?

Answer 10

muscle fibre type
capillary density
mitochondrial density & size
enzyme concentration

Question 11

what does lactate threshold predict performance-wise?

Answer 11

better performance if higher threshold

Question 12

4 factors which increase O2 extraction at the muscle during exercise

Answer 12

increase PO2 gradient
increase PCO2
decrease pH
increase temperature

Question 13

right shift of oxygen dissociation curve

Answer 13

decrease percent saturation of hemoglobin for given PO2 and increased O2 extraction to muscle