athlete specific strength
Download
Skip this Video
Download Presentation
Athlete Specific Strength

Loading in 2 Seconds...

play fullscreen
1 / 26

Athlete Specific Strength - PowerPoint PPT Presentation


  • 77 Views
  • Uploaded on

Athlete Specific Strength. Chapter 3. Last Week. Bilateral difference in maximal unloaded knee extension velocity? CMJ vs. SJ?. Force Generation. Muscles - peripheral factors CNS - central factors. Peripheral Factors. Cross sectional area ( CSA ) relates to strength

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Athlete Specific Strength' - colin-chambers


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
last week
Last Week

Bilateral difference in maximal unloaded knee extension velocity?

CMJ vs. SJ?

force generation
Force Generation
  • Muscles - peripheral factors
  • CNS - central factors
peripheral factors
Peripheral Factors
  • Cross sectional area (CSA) relates to strength
  • Myofibrils (sarcomeres with actin and myosin)
  • The result is crossbridges
  • Crossbridge attachment means strength
    • Both quantity & # of available attachment sites
  • Parallel vs. series (strength vs. velocity)
hypertrophy
Hypertrophy
  • Strength training increases size of the cell and number of filaments
  • Result is CSA
  • Hyperplasia is very small (<5%)
  • Sarcoplasmic hypertrophy no increase in strength (cell volumization)
  • Myofibrillar hypertrophy increases strength
hypertrophy cont
Hypertrophy cont…
  • Increase in actin and myosin (protein synthesis)
  • Training must be done properly (bodybuilders vs. weightlifters)
  • Muscle protein catabolism with heavy lifting leads to supercompensation with muscle anabolism
  • Type I – reduces protein degradation
  • Type II – increase protein synthesis
body weight bw
Body Weight (BW)
  • Muscle mass is about 50% of total BW
  • Strength to BW relationship is high in weightlifters and low in normals
  • Absolute vs. relative strength relationship is inverse
bw cont
BW cont…
  • Sport picks you - not vice versa
  • Small athletes have relative strength
  • Large athletes have absolute strength
  • Gymnasts vs. football
  • Wrestlers reduce weight to increase relative strength
nutritional and hormonal
Nutritional and Hormonal
  • Bioenergetics are required for protein synthesis
  • Amino acids build muscle
  • Protein requirements vary from 1-2-3g per kg
  • Anabolic hormones are testosterone and growth hormone (GH) and IGF-1
  • Catabolic is cortisol
  • Male vs. female concentrations?
  • Strength training increases anabolics (females?)
hormonal levels

Genesis of Developmental Differences

Between Male and Female

Testosterone Boys

Upper Body Strength Boys

Testosterone Girls

Upper Body Strength Girls

Puberty

0 5 10 12 15 20

AGE

Hormonal Levels
hormonal training
Hormonal Training
  • Heavy strength training increases GH
  • Hormonal changes are related to:
    • Muscle mass activated
    • Amount of work
    • Amount of rest
  • Nutrients must be ingested immediately following exercise for up-regulation
  • Testosterone, GH and IGF-1 increased
neural factors
Neural Factors
  • Muscle mass must be activated
    • Action potentials
  • Intermuscular coordination
    • Recruitment
    • Rate coding
  • Motor units – motor neuron and all fibers it innervates
  • Small vs. large motor units (20-2000)
  • Slow vs. fast – contractile properties
neural cont
Neural cont…
  • Slow twitch – low velocity, force and aerobic
  • Fast twitch – high velocity, force and anaerobic
  • Type I, IIa or IIx (may be 7-11)
  • All or none law – no gradation
  • Percentage varies by human being
  • http://www.blackwellpublishing.com/matthews/myosin.html
recruitment
Recruitment
  • Size principle - small to large (threshold?)
  • In mixed muscle ST continue to fire even when recruiting FT
  • 100% recruitment is impossible (95%-99%)
rate coding
Rate Coding
  • Firing rate increases with resistance requirements
  • Send more signals more quickly
  • Rate coding is important above 50-80% of max force
  • MU’s may synchronize for greater force
  • Psychological factors play a large role
intermuscular
Intermuscular
  • Skill requires coordination
  • Train movements not muscles
  • Electrical stim does not train the CNS
  • Bilateral deficit is CNS controlled
  • Isolated exercises are rehab or ameliorative
  • Machines vs. free weights?
taxonomy of strength
Taxonomy of Strength
  • Max slow force is similar to isometric
  • Eccentric strength is greatest
  • Force and velocity are inversely related
  • Maximorum force requires heavy resistance
  • RFD does not correlate with force max
  • SSC force is not increased with heavy strength training
next class
Next Class
  • Lab tonight on fast twitch fiber percentage and CSA (pg. 5 syllabus)
  • Homework - graphs and explanation
  • Homework - Table showing comparison of absolute strength vs. relative strength vs. strength per unit of CSA.
  • Homework – read the Thorstensson fatiguability and fiber comp article
  • Next week Chapter 4 and lab
ad