The muscle metabolic system in exercise

1- The phosphate system:

• Adenosine triphosphate (A.T.P) (Adenosine PO3 ~ PO3 ~ PO3-)

Each mol.. 7300 calories. (for 3 seconds)

• Creatin phosphate (creatin ~ Po3)

each bond 10.300 calories

( 8-10 seconds)

2- The glycogen–Lactic acid sys.

glycolysis• Glucose E+ pyruvic acid.

+02

energy used for resynthesize of 4 A.T.P molecules

In absence of 02

- 02• Pyruvic acid lactic acid

(1.3 – 1.6 minutes).

+O2 CO2+H2O+energy

3- The aerobic system.

In presence enough amount of O2

GlucoseFatty acids Amino acids

The three important metabolic systems that supply energy for

exercising muscle

Metabolic system Time

Phosphagen system 8 to 10 seconds

Glycogen – lactic acid system

1.3 to 1.6 minutes

Aerobic system Unlimited time (as long as nutrients last)

Duration for each metabolic system

Energy system used in various sports.

Phosphagen system:100- meter dash.Jumping.Weight lifting.Diving.

Phosphagen and glycogen-lactic acid systems:200 meter dash. Basketball.400-meter dash.100-meter swim.Tennis.

Glycogen – lactic acid and aerobic systems:800 – meter dash.200 – meter swim.Boxing.1500 – meter run.1- mile run. 400 –meter swim.

Aerobic system:10.000 meter skating.Cross-country. Marathon run (26.2 miles, 42.2 km).Jogging.

Recovery after exercise: Recovery is the time pass between the end

of exercise and return back to the resting parameters.

O2 O2 Lactic acid pyruvic acid E+CO2+H2O

Energy from the aerobic system used for reconstitute of A.T.P, cr~ p also glycogen in lactic acid system.

O2 debt • It is the O2 which was not supplied during the

exercise and supplied during recovery.

• Used for oxidation of accumulated lactic acid and resynthesize A.T.P and C.P.

• It’s value is the difference between the of O2

consumed during recovery period and the amount of O2 consumed during a similar period of rest.

The steady state (second wind)• On starting exercise athletes suffer

from dyspnea and discomfort.• Dyspnea disappears after some time

due to increase respiratory and circulatory functions to proved sufficient O2.

(steady state or second wind)

Relation between exercise and:a. Work loads. b. O2 uptake. c. Blood

lactate.