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AIS Chapter 13 Strength and power assessment

AIS Chapter 13 Strength and power assessment. Strength. Definition: ability of a muscle to produce force Maximal strength Strength endurance: repeatedly exert submaximal force Rate of force development (RFD) Isometric strength, measured by hand-held dynamometers Dynamic strength

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AIS Chapter 13 Strength and power assessment

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  1. AIS Chapter 13Strength and power assessment

  2. Strength • Definition: ability of a muscle to produce force • Maximal strength • Strength endurance: repeatedly exert submaximal force • Rate of force development (RFD) • Isometric strength, measured by hand-held dynamometers • Dynamic strength • Isokinetic dynamometry: constant angular velocity • Isoinertial test: constant load, such as 1 RM

  3. Strength • Speed-strength, also referred as POWER • Ability to apply force rapidly • Isoinertial protocols that use loads aimed at targeting specific aspects of strength and speed-strength continuum • Squat jump, countermovement jump, for lower body • Bench throw, bench pull, for upper body • Varying in inertial loads • Strength endurance • Max number of repetitions in push-ups, chin-ups… • Time to fatigue in submaximal isometric contraction

  4. Strength, power, and functional performance • Test results highly correlated with physical performance • Jumping, sprinting • Also correlated with skill-dominated activities • Golf club had speed, grinding in sailing • Weekly strength training important in maintaining sprint performance across season in team sport athletes • Power is usually a more useful discriminator than strength • Strength training more effective for weaker persons • Power training more effective for stronger persons

  5. Test protocols • Isometric midthigh pull • https://www.youtube.com/watch?v=kY2EzwrUhCw • Measure vertical ground reaction force via force platform • Highly related to max strength in dynamic lifts, substitutes to traditional RM testing • Maximum strength: 1 RM • Direct or indirect measurement

  6. Protocols for speed strength • Assessment against a spectrum of loads • Performance against > 1 inertial condition • Allows comparison of speed-strength characteristics against varying inertial loads • Decide training needs of each athlete, force-velocity spectrum

  7. Protocols for speed strength • Equipment: force platform, linear position transducer • Squat jump, countermovement jumps • Bench throw: explosively press barbell from chest as faraway as possible • Usually using Smith machine • Determine optimal load for average and peak power output • Important in designing power training program • Comparing SJ vs CMJ

  8. Use force platform and force transducer

  9. Interpretation of test results

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