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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Case
report
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FORCE-VELOCITY, IMPULSE-MOMENTUM RELATIONSHIPS: IMPLICATIONS FOR EFFICACY OF PURPOSEFULLY SLOW RESISTANCE TRAINING |
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Brian K. Schilling1  ,
Michael J. Falvo2 and Loren Z.F. Chiu3 |
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1Exercise Neuromechanics Laboratory, The University of Memphis, Memphis, USA 2Locomotor Control Laboratory, Washington University School of Medicine, USA 3Department of Biokinesiology and Physical Therapy, University of Southern California, USA |
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© Journal of Sports Science and Medicine (2008) 7, 299 - 304 |
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| ABSTRACT | |||
| The purpose of this brief review is to explain the mechanical
relationship between impulse and momentum when resistance exercise is performed
in a purposefully slow manner (PS). PS is recognized by ~10s concentric
and ~4-10s eccentric actions. While several papers have reviewed the effects
of PS, none has yet explained such resistance training in the context of
the impulse-momentum relationship. A case study of normal versus PS back
squats was also performed. An 85kg man performed both normal speed (3 sec
eccentric action and maximal acceleration concentric action) and PS back
squats over a several loads. Normal speed back squats produced both greater
peak and mean propulsive forces than PS action when measured across all
loads. However, TUT was greatly increased in the PS condition, with values
fourfold greater than maximal acceleration repetitions. The data and explanation
herein point to superior forces produced by the neuromuscular system via
traditional speed training indicating a superior modality for inducing neuromuscular
adaptation.
Key words: Impulse, momentum, purposefully slow, time-under-tension. |
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