3. decline in muscle performance associated with muscle
activity.
As fatigue sets in,
o force in your muscles reduces,
o muscle responses to brain stimuli reduces
o activity levels decrease.
temporary and reversible condition
continuous high-frequency
stimulation
repeated tetanic
stimulation
5. Fuel depletion Metabolic by-products Neuromuscular events
•Intramuscular ATP
• Muscle glycogen
• Blood glucose
• Hydrogen ions (H+) in
plasma and muscle
• Inorganic phosphate
(Pi)
• Adenosine diphosphate
(ADP)
• Decreased ‘firing’ of the
central nervous system
• Impaired sodium (Na+)
and potassium (K+)
gradients
6. Problem:
build up of
lactic acid
Problem:
needs oxygen
Problem: only make
1 ATP at a time
(15-20s of activity)
Ca2+
7. Myosin: for cross-bridge cycling
Ca2+ ATPase:
o terminate contraction, pump Ca2+ back into sarcoplasmic reticulum
8.
9. reduced maximum force-generating capacity
reduced myofibrillar Ca2+ sensitivity
reduced Ca2+ release
↓ force
10. • ACIDOSIS
• H+ competes with Ca2+ for binding sites on troponin C
• ↓ maximal Ca2+ activated force and Ca2+ sensitivity (slows the maximal
shortening velocity and prolongs relaxation)
• Burning sensation
11.
12. Predominant
energy system
Likely causes of fatigue Types of recovery
ATP/PC Fuel Depletion:
ATP & PC
Rest recovery
Lactic Acid Accumulation of metabolic by-
products:
H+ (hydrogen ions)
Pi (inorganic phosphates)
Non-dietary
Active Recovery
Massage
Hydro/water based therapies
e.g. contrasting via hot/cold baths
Aerobic Fuel Depletion:
Glycogen stores, then fats
Elevated body temperature leading to:
Dehydration
Dietary
High Glycemic Index foods
Rehydration
Non-dietary
Active Recovery
Massage
Hydro/water based therapies
