![Page 1: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/1.jpg)
Muscular Fatigue• reduces pool of fibers available to contract and force
– 1. lactate accumulation
– 2. glycogen depletion
• lactate accumulation
– high intensity exercise
– increased muscle lactate
• reduces pH (acidic)– muscles fail to contract
• decreases rate of energy production
– lactate accumulation in FG fibers first
• reduction of power
– light exercise hastens removal
![Page 2: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/2.jpg)
![Page 3: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/3.jpg)
• glycogen depletion
• not the fatigue factor for high intensity work
– low intensity work
– depletion reflects recruitment pattern
• ST - first to fatigue
• FOG fibers second
• FG may eventually deplete
– as one fiber type is depleted the next is recruited
– fibers dependent on fats for energy
• decreased rate of energy production
• must slow speed
• fatigue before completely out of adipose tissue
– repletion of glycogen
• 2 days
• reverse order of recruitment
![Page 4: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/4.jpg)
![Page 5: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/5.jpg)
![Page 6: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/6.jpg)
• ability to perform is limited by onset of fatigue
• impairment of muscle function
– depletion of substrate
– disruption of energy production
– electrolyte gradients
– alteration of calcium uptake and release by SR
– decrease blood flow and/or too much temperature increase in muscles
![Page 7: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/7.jpg)
Diseases
• muscle strain
– over-stretched muscle
• increases heat (increased blood flow)
• swelling from fluid accumulation
• pain
– rest and cold hydo-therapy
– recovery time
• days to weeks
– test for muscle damage
• CK
![Page 8: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/8.jpg)
• Exertional Rhabdomyolysis- tying up, azoturia
– exercise induced damage to muscle
• mild cramping to inability to move
– common conditions
• well conditioned horse– after day or two rest and full feed
• over exercised
• fluid/electrolyte imbalance- dehydration (decreased chloride and calcium)
• deficiency of selenium and /or Vit E
• hormonal effect– high strung
– female
• genetic predisposition
![Page 9: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/9.jpg)
• symptoms
– stiff gait to not moving at all
– if down, unable to get up
– muscles of hind quarters and back most affected
• shoulder muscles
– muscle feel rigid; deep palpation causes pain
– distressed, sweating, increased temperature, increases RR and increases HR
![Page 10: Muscular Fatigue reduces pool of fibers available to contract and force –1. lactate accumulation –2. glycogen depletion lactate accumulation –high intensity](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e405503460f94b31ae4/html5/thumbnails/10.jpg)
• treatment
– limit muscle damage
– restore fluid and electrolytes
– relaxants/pain relievers
– keep warm and still
• mild cases - walk
• prevention
– change diet
– training
• often reoccurs