Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading

Variable resistance training (VRT) such as that employed by equipment that utilizes asymmetrical cams or pulleys (ASYM CAM) (e.g., Nautilus Machines) and elastic resistance (ELASTIC) are commonly used by athletes and fitness enthusiasts. However, the use of ELASTIC in high intensity training protoco...

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Main Authors:	Aboodarda, S.J., Ibrahim, F., Mokhtar, A.H., Thompson, M.W., Behm, D.G.
Format:	Article
Published:	American Society of Exercise Physiologists 2012
Subjects:	GV Recreation Leisure R Medicine
Online Access:	https://www.asep.org/asep/asep/JEPonlineDECEMBER2012_Aboodarda.pdf https://www.asep.org/asep/asep/JEPonlineDECEMBER2012_Aboodarda.pdf

id	um-14431
recordtype	eprints
spelling	um-144312017-11-01T05:57:11Z Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading Aboodarda, S.J. Ibrahim, F. Mokhtar, A.H. Thompson, M.W. Behm, D.G. GV Recreation Leisure R Medicine Variable resistance training (VRT) such as that employed by equipment that utilizes asymmetrical cams or pulleys (ASYM CAM) (e.g., Nautilus Machines) and elastic resistance (ELASTIC) are commonly used by athletes and fitness enthusiasts. However, the use of ELASTIC in high intensity training protocols has been controversial due to the limitation of providing a relatively low external force. The purpose of this study was designed to quantify and compare the acute responses in electromyogram signals (EMG) and the concentration of serum growth hormone ([GH]), testosterone ([T]), and lactate ([LA]) following fatiguing knee extension exercise with ELASTIC and ASYM CAM. In a counterbalanced cross-over study, nine male (21.08 ± 6.2 yrs) recreationally active subjects completed 5 sets of 10-RM knee extension exercise with ELASTIC and ASYM CAM with 3 wks of no training between experimental conditions. Blood sampling, maximum voluntary contraction (MVC) and EMG were recorded before, immediately, 15, 30, and 60 min after the termination of the exercise bout. The average of applied forces with ASYM CAM was significantly higher than ELASTIC (362 ± 34.2 N vs. 266.73 ± 58.56 N; P = .00) across the 5 sets of dynamic exercises. However, the average force and mean amplitude of MVC as well as the [GH], [T] and [LA] demonstrated no significant difference between the two types of exercise either in the pretest or during the recovery period (all P>0.05). Contrary to the traditional approach of using ELASTIC, which is for early rehabilitation purposes, the findings of the present study suggest ELASTIC is an acceptable exercise device for high intensity resistance training in the final stages of rehabilitation as well as athletic conditioning. American Society of Exercise Physiologists 2012-12 Article PeerReviewed https://www.asep.org/asep/asep/JEPonlineDECEMBER2012_Aboodarda.pdf Aboodarda, S.J.; Ibrahim, F.; Mokhtar, A.H.; Thompson, M.W.; Behm, D.G. (2012) Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading. Journal of Exercise Physiology - Online <http://eprints.um.edu.my/view/publication/Journal_of_Exercise_Physiology_-_Online.html>, 15 (6). pp. 1-12. ISSN 1097-9751 http://eprints.um.edu.my/14431/
repository_type	Digital Repository
institution_category	Local University
institution	University Malaya
building	UM Research Repository
collection	Online Access
topic	GV Recreation Leisure R Medicine
spellingShingle	GV Recreation Leisure R Medicine Aboodarda, S.J. Ibrahim, F. Mokhtar, A.H. Thompson, M.W. Behm, D.G. Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading
description	Variable resistance training (VRT) such as that employed by equipment that utilizes asymmetrical cams or pulleys (ASYM CAM) (e.g., Nautilus Machines) and elastic resistance (ELASTIC) are commonly used by athletes and fitness enthusiasts. However, the use of ELASTIC in high intensity training protocols has been controversial due to the limitation of providing a relatively low external force. The purpose of this study was designed to quantify and compare the acute responses in electromyogram signals (EMG) and the concentration of serum growth hormone ([GH]), testosterone ([T]), and lactate ([LA]) following fatiguing knee extension exercise with ELASTIC and ASYM CAM. In a counterbalanced cross-over study, nine male (21.08 ± 6.2 yrs) recreationally active subjects completed 5 sets of 10-RM knee extension exercise with ELASTIC and ASYM CAM with 3 wks of no training between experimental conditions. Blood sampling, maximum voluntary contraction (MVC) and EMG were recorded before, immediately, 15, 30, and 60 min after the termination of the exercise bout. The average of applied forces with ASYM CAM was significantly higher than ELASTIC (362 ± 34.2 N vs. 266.73 ± 58.56 N; P = .00) across the 5 sets of dynamic exercises. However, the average force and mean amplitude of MVC as well as the [GH], [T] and [LA] demonstrated no significant difference between the two types of exercise either in the pretest or during the recovery period (all P>0.05). Contrary to the traditional approach of using ELASTIC, which is for early rehabilitation purposes, the findings of the present study suggest ELASTIC is an acceptable exercise device for high intensity resistance training in the final stages of rehabilitation as well as athletic conditioning.
format	Article
author	Aboodarda, S.J. Ibrahim, F. Mokhtar, A.H. Thompson, M.W. Behm, D.G.
author_facet	Aboodarda, S.J. Ibrahim, F. Mokhtar, A.H. Thompson, M.W. Behm, D.G.
author_sort	Aboodarda, S.J.
title	Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading
title_short	Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading
title_full	Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading
title_fullStr	Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading
title_full_unstemmed	Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading
title_sort	acute neuromuscular and hormonal responses to resistance exercise using variable external resistance loading
publisher	American Society of Exercise Physiologists
publishDate	2012
url	https://www.asep.org/asep/asep/JEPonlineDECEMBER2012_Aboodarda.pdf https://www.asep.org/asep/asep/JEPonlineDECEMBER2012_Aboodarda.pdf
first_indexed	2018-09-06T06:22:48Z
last_indexed	2018-09-06T06:22:48Z
_version_	1610838147123380224

Acute Neuromuscular and Hormonal Responses to Resistance Exercise Using Variable External Resistance Loading

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