Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch

Bibliographic Details
Main Author:	Loew, Emily
Language:	English
Published:	University of Toledo / OhioLINK 2019
Subjects:	Sports Medicine Health Care
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556792929213981

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-toledo15567929292139812021-08-03T07:10:59Z Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch Loew, Emily Sports Medicine Health Care Context: Overhead throwing athletes experience more injuries to the medial elbow as a result of increased valgus force to the elbow. The FCU is shown to play an important role in stabilizing the medial elbow during throwing, but there is little research regarding the neural response of this musculature. A measurement called Hoffmann (H) reflex allows for assessment of motor neuron pool excitability (MNPE) of targeted muscles. Previous studies have evaluated effects of joint distention on MNPE in the lower extremity, but there is currently no research on the effects in the upper extremity. Thus, there is no known neurophysiological response of the FCU when the elbow experiences difference in levels of stretch during the act of throwing. Objective: To evaluate differences in MNPE of the FCU using H-reflex when the elbow is placed at increasing levels of stretch (neutral, medium, high). Design: Descriptive. Setting: Laboratory. Participants: 12 healthy males. Inclusion: aged 18-30, recreationally active with history of participation in overhead sport, no history of upper extremity injury or surgery. Exclusion: unable to elicit measurable H-reflex, known central or peripheral nerve pathology, current use of depressants or stimulants, pain with shoulder internal or external rotation. Interventions: Independent variables included level of stretch (neutral, medium, high). All participants completed three measurable trials at each condition. Main Outcome Measures: Maximum H-reflex response, maximum M-wave response, and H:M ratio were recorded and analyzed for observed differences between increasing levels of elbow stretch. Results: Decrease in H-reflex response from neutral to high stretch [ES=-0.63(-1.6,0.4); p=.007]. No difference in M-response [ES=-0.40(-1.5,0.7); p=.520] or H:M ratio [ES=-0.38(-1.4,0.6); p=.700] with increase in stretch. Conclusion: There was a decrease in H-reflex response of the FCU as the level of stretch increased from neutral to high. Level of stretch did not influence H:M response of FCU. Word Count: 297 2019-08-28 English text University of Toledo / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556792929213981 http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556792929213981 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Sports Medicine Health Care
spellingShingle	Sports Medicine Health Care Loew, Emily Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch
author	Loew, Emily
author_facet	Loew, Emily
author_sort	Loew, Emily
title	Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch
title_short	Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch
title_full	Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch
title_fullStr	Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch
title_full_unstemmed	Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch
title_sort	comparison of flexor carpi ulnaris hoffmann reflex at different levels of elbow stretch
publisher	University of Toledo / OhioLINK
publishDate	2019
url	http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556792929213981
work_keys_str_mv	AT loewemily comparisonofflexorcarpiulnarishoffmannreflexatdifferentlevelsofelbowstretch
_version_	1719455912234582016

Comparison of Flexor Carpi Ulnaris Hoffmann Reflex at Different Levels of Elbow Stretch

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