lec 22
Help!
|
|
||||
|---|---|---|---|---|---|
| increase % SO | Endurance training
🗑
|
||||
| increase % FT | Sprinters
🗑
|
||||
| Average persons SO & FT | 50% / 50%
🗑
|
||||
| Factors affecting the force & power production | - Myogenic or intrinsic factors
- Length-tension relationship
- Force-velocity relation
🗑
|
||||
| Length-tension relationship | - Length of muscle affects overlap between the thick & thin filaments
- # cross bridges activated
🗑
|
||||
| Force-velocity relation | The amount of force developed during muscular contractions also depend on the velocity of the contraction
🗑
|
||||
| ^ Contraction | v velocity
🗑
|
||||
| v Contraction | ^ Velocity
🗑
|
||||
| FT develops what? | larger peak force
🗑
|
||||
| ST contracts what? | higher velocity
🗑
|
||||
| Velocity = 0 | the highest amount of force (isometric)
🗑
|
||||
| Po | maximal force when velocity is 0
🗑
|
||||
| o VMax | Max velocity of contraction when Force = 0
🗑
|
||||
| Why do FT contract @ higher velocity? - What is the underlying mechanism? | FG fibers have higher ATPase activity – higher rate of ATP hydrolysis – higher rate of energy transformation. – higher rate of cross bridge recycling – higher contractile velocity (unloaded or @ any given force)
🗑
|
||||
| what makes a muscle develop force faster | - Force depends on # of cross bridges that are in power/active
- Depends. On how many troponins are saturated with calcium
🗑
|
||||
| Rate of force depends on | Ca++ released
🗑
|
||||
| ^ Ca++ = | ^ Cross bridges = ^ force
🗑
|
||||
| FG fibers develop force @ higher rate | it has well-developed (denser) SR network
- Higher rate of Ca++ release – higher rate of force development
🗑
|
||||
| Which MF develop force faster | FG fibers
🗑
|
||||
| Ca++ Re-uptake is also faster in what | resulting in faster relaxation (FT)
🗑
|
||||
| Static (isometric) action | Limb does not move but muscle contracts
🗑
|
||||
| Dynamic (isotonic) Action | Developing force with lengthening or shortening
🗑
|
||||
| Concentric muscular action | Shorten/contraction
🗑
|
||||
| Eccentric muscular action | • Lengthening
• Hypertension happens here
🗑
|
||||
| Isokinetic muscular action | - Same movement of velocity
- Velocity remains same
🗑
|
||||
| Muscle develops larger force when | its forcibility being stretched
- Eccentric
🗑
|
||||
| Power-velocity Relationship | ^ velocity of contraction the ^ power output
🗑
|
||||
| Further ^ in velocity | results in v Power output
🗑
|
||||
| Optimal Velocity | the velocity of muscular action @ which the P.O. is maximal
🗑
|
||||
| ^O.P. @ any given velocity | FT have ^higher P.O. than S.O.
🗑
|
||||
| @ any P.O | S.O. contracts faster than FT
🗑
|
||||
| Effect of FG on the power velocity relationship during concentric muscular action | - FG = ^ P.O. @ any given velocity
- FG = v Velocity @ any given P.O.
- FG = ^ Optimal velocity
🗑
|
||||
| Highest Power output achieved at | 30% velocity max
🗑
|
||||
| Power-velocity the P.O is greater in a muscle of different fiber type composition | @ any given velocity the P.O. is greater in a muscle with higher % of FT fibers
🗑
|
||||
| The peak power of muscles increases with what? | velocity up to angular velocity of 200-300 degrees-sec
🗑
|
||||
| In vivo | Force developed by muscles in regulated by 2 mechanisms
🗑
|
||||
| Necrogenic regulation of muscle 2 mechanisms | 1. BY regulating the # of motor units recruited into action – up to 100-fold increase the force output
2. By regulating the force output via increasing the firing frequency of a motoneurons (Rate coding - 4-fold)
🗑
|
||||
| Specific training | ^ anaerobic & aerobic capacity of both MF types
🗑
|
||||
| Types IIx --> IIa | Both strength & endurance training
🗑
|
||||
| Type IIa --> I | Extensive endurance training
🗑
|
||||
| Endurance training | ^ aerobic capacity
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
rmart11
Popular Physiology sets