Anaerobic power and isometric strength

defining aerobic power

• gylcolysis is dominant after 10s

  • cross over pit between ATP-PC and glycolysis occurs around 8s

• all systems begin at same time but contribution changes

• after 60s glycolysis is now exhausted

• increased movement velocity - decreased load applied

  • decreased force generation

vertical jump

• well correlated with peak leg power

  • scoring connection to ADLs but less so for sports

• measured using countermovement jump

  • requires voluntary somatic control

• 3 jumps are performed w/ 15s between as utilizes ATP-PC system

• high test-retest reliability coefficients of different vertical jump tests

  • r > 0.98 - protocol of Gray et al.

  • r > 0.92 - jump and reach protocol Genocross 1966

• Test-retest reliability coefficient of vertical jump test is 0.95

wingate

• test-retest coefficient of correlation is high - 0.91 and 0.93

  • 0.93 for wingate test performed with the arms

• coefficient of variation of a 30s all-out test on an isokinetic cycle erg is equal to 5.4%

• test-retest riablibty of the rate of power decrease is worse than mean power

  • 0.43 and 0.74 respectively

• coefficient of variation of fatigue index is higher than coefficient of variation of maximal peak torque

relationship to aerobic power

• athletes training aerobically also have an icnrease in VO2max

  • moderate correlation as we cannot isolate measures

    • significant overall of sprint performance seen → aerobic capacity

eliciting maximal lactate response

• no significant difference when comparing work to rest ratios between groups (energy pathway)

  • only significant difference between ATP-PCr 10:2 and 10:4

metabolic response to sprinting

• increase in VO2 lower fatigue index

  • fatigue index during repeated spring tests measured

• anaerobic power often shorter in length dominated by ATP-PC system but can also engage glycolytic system when over 10s such as wingate test

broad jump

• when comparing standing broad jump (SBJ) to peak power during wingate

  • r = 0.446 indicating moderate correlation and a p <0.0001

• ban-altman demonstrates

  • ~5% of values outside limits of agreement

  • mean bias is virtually 0

  • symmetrical error (LOAs) due ot z score data

capacity v power

• Cunningham vs wingate

  • Cunningham

    • constant workload max time

      • capacity

    • warm-up: progress to 6mph 0% grade and practice getting on and off belt

      • then increase to 8mph and 20% grade

    • measure total time of unsupported running

      • record time to nearest 0.5s

  • Wingate

    • power measure

    • all out test for a given length of time

isometric strength

• max grip strength and IMTP are common measures

grip strength

• strong predictor of

  • whole body strength

  • disability in older adulthood

  • OP risk

  • nutritional status

  • body composition

  • lung function

  • hospital stay duration

  • mortality

  • etc etc

• also quick, easy, cheap and portable

IMTP

• strong predictor of performance in

  • deadlift 1Rm

  • squat 1RM

  • running peorfmrnace

  • sport peorfmrance

  • jump ability

  • etc. etc

• quick, easy, cheap and portable