MEASUREMENT OF STRENGTH & POWER USING VARIOUS TECHNIQUES Flashcards
Physiological and mechanical factors
Muscle structure
Joint Position
Joint velocity
Muscle structure is made up of which variables
Fibre type
Architecture
Joint position is made up of which variables
Moment arm
Muscle Length
Joint velocity is made up of which varibale
Force velocity
Different type of requirements in sports
Strength - powerlifting
Strength - speed
Speed - Strength
Speed - sprinting
Why is strength related to sprinting?
Push off force from blocks
Purpose of strength assesments?
Ability to distinguish between athletes at different levels
Indicator of ‘good’ performance
Correlation with athletic performance
Sensitivity to training adaptions
Injury prevention
Strength assessment specificity
Testing conditions should imitate the movement/ activity and training conditions
Violation will result in data problems
Specificity considerations
Type of movement Velocity of movement Posture Joint position Bilateral
Isotonic strength testing
Isotonic = equal + tension
Anisometric - ‘non + equal + length’
Equipment
Free weights
Strengths of isotonic testing
ecological validity
Limitations of isotonic testing
One rm doesn’t provide scientific reason behind
Force x Velocity
Power
Vertical GRF
Centre of mass
What has half back squat training correlated with
Sprinting performance
Power and speed based tests
Types
- Slow ssc (>250ms) CMJ
- Fast ssc (<250ms) drop jump
Assessment of leg extensors’ power
- Profiling
- Discriminative analysis
- Training adaptations
Vertical jumping - mechanical and performance variables
- Impulse
- Take-off velocity
- Power
- Jump height (CoM)
- Rate of force development
- Speed index
- Reactive strength index
How to calculate rate of force development
10% - 90%
Isometric strength testing advantages
- Muscle group isolation
- Accurate and reliable
- Quantified and detailed biomechanics analysis
Isometric strength testing limitations
- Specific joint position strength
- Difficult to elicit an (MVC) maximum voluntary contraction
Force development calculations
Peak RFD - steepest point
Definition of force development
Relationship with muscle architecture
Isokinetic meaning
Constant velocity
Isokinetic strength pros
Testing force velocity relationship
Advantages of isokinetic testing
- muscle group isolation
- maximal resistance in ROM
- Quantification
- correlated with performance
- safety
Disadvantages of isokinetic strength testing
not a real movement (need familiarisation) cannot match angular velocities during dynamic activities
