metabolic adaptations to steady state exerciserrobergs/426l15ststate.pdfadaptations during steady...
TRANSCRIPT
Dr. Robergs Fall, 2010
Steady State Exercise 1
Metabolic Adaptations to Steady State Exercise
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.00.5
1.0
1.5
2.0
2.5
3.0
Time (min)
VO2
(L/m
in)
160 Watts
120
80
40
Dr. Robergs Fall, 2010
Steady State Exercise 2
1 2 3 4 5 6 70.0
0.5
1.0
1.5
2.0
2.5
3.0 Oxygen Deficit
Time (min)
VO2
(L/m
in)
Oxygen Consumed
Dr. Robergs Fall, 2010
Steady State Exercise 3
20 40 60 80 100 120 140 160 1800.5
1.0
1.5
2.0
2.5
3.0
VO2 = (0.01184 x Watts) + 0.699
Power Output (Watts)
VO2
(L/m
in)
2 3 4 5 6 7
80
100
120
140 160 Watts
120
80
40
Time (min)
Hea
rt R
ate
(bea
ts/m
in)
Dr. Robergs Fall, 2010
Steady State Exercise 4
20 40 60 80 100 120 140 160 18050
70
90
110
130
150 HR = (0.4038 x Watts) + 77.65
Watts = (HR - 77.65) / 0.4038
Power Output (Watts)
Hea
rt R
ate
(bea
ts/m
in)
b. VO2 DriftFor exercise intensities > 60% VO2max, prolonged exercise (> 30 min) causes a slight continued increase in VO2. (increased temperature and circulating catecholamines)
c. CHO CatabolismIncreases with an increase is exercise intensity, with an increasing reliance on muscle glycogen.
d. Lipid CatabolismDecreases with an increase is exercise intensity. The majority of the source of FFA used during exercise is from intramuscular lipid droplets.
Adaptations during steady state exercise, cont’d.
Dr. Robergs Fall, 2010
Steady State Exercise 5
Endurance trainedRelatively untrained
Exercise at the lactate threshold
Short term intense exercise
The lower the exercise intensity, the longer the time to muscleglycogen depletion.
Metabolic Energy Demand Is Quantified by Whole Body Oxygen Consumption (VO )2
Dr. Robergs Fall, 2010
Steady State Exercise 6
Treadmill Walking and Running
Dr. Robergs Fall, 2010
Steady State Exercise 7
Douglas Bag Collection of Expired Air
Dr. Robergs Fall, 2010
Steady State Exercise 8
Exercise Increases Muscle and Whole Body Energy Demand In a Predictable Manner