NDLI: A mechanical comparison of linear and double-looped hung supplemental heavy chain resistance to the back squat: a case study.

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A mechanical comparison of linear and double-looped hung supplemental heavy chain resistance to the back squat: a case study.

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A mechanical comparison of linear and double-looped hung supplemental heavy chain resistance to the back squat: a case study.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Neelly, Kurt R. Terry, Joseph G. Morris, Martin J.
Description	Country affiliation: United States Author Affiliation: Neelly KR ( Department of Physical Therapy and Health Science, Bradley University, Peoria, Illinois, USA. kurtn@bradley.edu)
Abstract	A relatively new and scarcely researched technique to increase strength is the use of supplemental heavy chain resistance (SHCR) in conjunction with plate weights to provide variable resistance to free weight exercises. The purpose of this case study was to determine the actual resistance being provided by a double-looped versus a linear hung SHCR to the back squat exercise. The linear technique simply hangs the chain directly from the bar, whereas the double-looped technique uses a smaller chain to adjust the height of the looped chain. In both techniques, as the squat descends, chain weight is unloaded onto the floor, and as the squat ascends, chain weight is progressively loaded back as resistance. One experienced and trained male weight lifter (age = 33 yr; height = 1.83 m; weight = 111.4 kg) served as the subject. Plate weight was set at 84.1 kg, approximately 50% of the subject's 1 repetition maximum. The SHCR was affixed to load cells, sampling at a frequency of 500 Hz, which were affixed to the Olympic bar. Data were collected as the subject completed the back squat under the following conditions: double-looped 1 chain (9.6 kg), double-looped 2 chains (19.2 kg), linear 1 chain, and linear 2 chains. The double-looped SHCR resulted in a 78-89% unloading of the chain weight at the bottom of the squat, whereas the linear hanging SHCR resulted in only a 36-42% unloading. The double-looped technique provided nearly 2 times the variable resistance at the top of the squat compared with the linear hanging technique, showing that attention must be given to the technique used to hang SHCR.
File Format	HTM / HTML
ISSN	10648011
Issue Number	1
Volume Number	24
e-ISSN	15334287
Journal	Journal of Strength and Conditioning Research
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2010-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Sport Sciences Resistance Training Methods Weight-bearing Physiology Adult Biomechanical Phenomena Humans Male Movement Instrumentation Comparative Study Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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