2.2 What causes muscle fatigue
What is glycogen production selective to
muscle groups involved in the activity
What are the two mechanisms of this process
running out of fuel and buildup
What happens when pH falls below 6.9
the cellular processes of energy in production and muscle contraction begin to slow
Why does this happen
there is a break in the chain of events in muscular contraction
What is buildup
accumulation of metabolic by-products
What is peripheral muscle fatigue caused by
inability for the body to supply sufficient energy or other metabolites to the contracting muscles to meet the increased energy demand
What happens due to leakage of ACH and Calcium
insufficient levels lead to reduced muscular recruitment and contractions
What are the possibilities for central fatigue
interruption in motor coordination, inhibition of voluntary effort, psychological factors, pain perception and tolerance, neural malfunction, interference in the basal ganglia
What are the two types of fatigue
Central and Peripheral
What is running out of fuel
Depletion of neurotransmitters and energy sources
What does glycogen depletion from type I and type II fibers depend on
Duration and intensity of the activity
What do the muscles operate best at (pH)
6.9-7.1
What do we need for a muscular contraction
ACH to bind at the neuromuscular junction, calcium dependent binding, ATP release
What kind of byproducts effect pH balance
Hydrogen and Lactic acid
What does energy depletion cause to happen
Impaired ATP production
What are the neural malfunctions
Membrane potentials are unable to reach sufficient levels to continue to send action potentials
What happens when the pH gets below 6.4
Myosin can no longer bind to actin, muscle contraction stops
What are the psychological factors that could effect central fatigue
Perception and tolerance
What happens to energy production systems during exercises
Produce many metabolic byproducts
What does fatigue result in
The cessation of muscular work or the inability to maintain a given intensity of work