Fundamentals of Biomechanics

LAB ACTIVITY 4 NAME _____________________________
MUSCLE ACTIONS AND THE STRETCH-SHORTENING
CYCLE (SSC)
Maximal Repetitions with a Submaximal Resistance
Concentric—Stronger Side Eccentric—Weaker Side
Subject 1 _________ _________
Subject 2 _________ _________
Subject 3 _________ _________
Subject 4 _________ _________
Subject 5 _________ _________
Pre-Stretch Augmentation in SSC
CMJ _________ SJ _________
PA (%) = ((CMJ – SJ)/SJ) • 100 (Kubo et al., 1999)
My PA _________ Class Mean PA _________
QUESTIONS
1. Did the stronger side of the body have the most endurance? Explain the results of this
comparison of concentric and eccentric muscles actions based on the Force–Velocity Relationship
of muscle.
2. Hypothesize the likely lower extremity muscle actions in the SJ and the CMJ.
3. How much improvement in vertical jump could be attributed to using a SSC?
LAB ACTIVITIES L-9
4. What aspects of coaching jumps and other explosive movements must be emphasized to
maximize performance? Explain why your technique points may improve performance
based on muscle mechanics or principles of biomechanics.
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