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Aerobic vs. Anaerobic Necessities for Combustion • Engine: Necessities for Combustion • Engine: Fuel (gas) + Ignition (spark) + O2 • Fire: Necessities for Combustion • Engine: Fuel (gas) + Ignition (spark) + O2 • Fire: Fuel (wood) + Ignition (match) + O2 • Muscle: Necessities for Combustion • Engine: Fuel (gas) + Ignition (spark) + O2 • Fire: Fuel (wood) + Ignition (match) + O2 • Muscle: Fuel (carbs) + Nerve impulse +O2 Necessities for Combustion • Oxygen – is the most limiting factor for performance. – Is transported to the muscle by the blood. – transport is interrupted by muscle contraction (mush like stepping on a hose.) Aerobic Contraction • Muscle contraction with oxygen. • Muscle contracts for a short time and then relaxes long enough in between contractions allowing blood (O2) into the muscle. Aerobic Contraction • Examples: ??? Anaerobic Contraction • Muscle contraction without oxygen. • Muscle contracts long enough to prevent O2 transport to the muscle cells. OR • Muscle contracts and relaxes too fast to allow blood (O2) to muscle cells. Anaerobic Contraction • Examples: ??? – Long contraction … – Very rapid contraction … Anaerobic Contraction Oxygen Debt • Oxygen wasn’t available during anaerobic contraction so it must be paid back (panting) Anaerobic Contraction Waste Products • Heat – sweat • CO2 – breathe out • Lactic Acid – in muscle – Inhibits muscle contraction – Causes the “burn” during exercise – Contributes to soreness – Aerobic exercise the next day increases circulation of blood to muscles and carries away lactic acid. Soreness will be relieved more quickly. Aerobic vs. Anaerobic Contraction Activity (12 pts) • Groups of 3-4 max • Develop an activity to demonstrate the difference between aerobic and anaerobic contraction including all effects. Five facts must be stressed. • Audience: sixth grade students • Puzzles, games, demos, etc. (No lectures) Activity Scoring 12 points ____ (1 pt) Did all the group members actively participate? ____ (5 pts) Were five facts about aerobic and anaerobic activity expressed? ____ (2 pts) Was the information given accurate and understandable? ____ (1 pt) Were all the participants audible? ____ (1 pt) Was the activity original and creative? ____ (2 pts) Were all group members good audience members when not performing?
