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Knee Extensor Fatigability During Di...

Delgadillo, Jose.

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Knee Extensor Fatigability During Different Resistance Exercise Protocols in Young and Old Adults.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Knee Extensor Fatigability During Different Resistance Exercise Protocols in Young and Old Adults./
Author:	Delgadillo, Jose.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	78 p.
Notes:	Source: Masters Abstracts International, Volume: 80-05.
Contained By:	Masters Abstracts International80-05.
Subject:	Gerontology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10933751
ISBN:	9780438657564

Knee Extensor Fatigability During Different Resistance Exercise Protocols in Young and Old Adults.
Delgadillo, Jose.

Knee Extensor Fatigability During Different Resistance Exercise Protocols in Young and Old Adults. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 78 p.

Source: Masters Abstracts International, Volume: 80-05.

Thesis (M.S.)--Marquette University, 2018.

This item must not be sold to any third party vendors.

Aging is associated with decreased muscle strength, power, and contraction velocity, and increased fatigability of the lower limb muscles during dynamic contractions. The aims of this thesis were to compare young in and old men and women in: (1) fatigability of the knee extensors for two types of dynamic fatiguing protocols that are the basis of resistance training protocols, and (2) the central and peripheral mechanisms of fatigue during the two types of dynamic fatiguing protocols. Twenty young (19-24, 22.2 ± 1.3 years, men = 10) and twenty old adults (64-85, 73.8 ± 5.4, men = 10) performed: two different resistance training protocols, one high load high velocity protocol (HLP) and one low load low velocity protocol (LLP), each completing 4 sets of 8 repetitions. Before and after each protocol, the following were assessed: voluntary activation using muscle stimulation and the interpolated twitch technique as a measure of central fatigue, and contractile properties evoked with electrical stimulation as a measure of peripheral fatigue. The LLP of the knee extensor muscles induced greater reductions in isometric force than the HLP (P < 0.05) (21% vs. 12% reduction) across all four exercise sets, resulting in greater fatigability for the LLP. A more rapid recovery of MVIC force for the young adults compared to the old was observed (P < 0.05). The LLP also showed a greater reduction in the rate of force development than the HLP (P < 0.05). The reduction in MVIC force was associated with the reductions in twitch amplitude (r² = 0.368, P < 0.001) and voluntary activation (r2 = 0.209, P 0.05). The LLP protocol induced greater fatigability of the knee extensor muscles than the HLP, evidenced by greater reductions in MVIC. Muscular mechanisms were the primary contributor to the differences with a smaller contribution from neural mechanisms.

ISBN: 9780438657564Subjects--Topical Terms:

533633
Gerontology.
Subjects--Index Terms:

Exercise science

Knee Extensor Fatigability During Different Resistance Exercise Protocols in Young and Old Adults.
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520 $a Aging is associated with decreased muscle strength, power, and contraction velocity, and increased fatigability of the lower limb muscles during dynamic contractions. The aims of this thesis were to compare young in and old men and women in: (1) fatigability of the knee extensors for two types of dynamic fatiguing protocols that are the basis of resistance training protocols, and (2) the central and peripheral mechanisms of fatigue during the two types of dynamic fatiguing protocols. Twenty young (19-24, 22.2 ± 1.3 years, men = 10) and twenty old adults (64-85, 73.8 ± 5.4, men = 10) performed: two different resistance training protocols, one high load high velocity protocol (HLP) and one low load low velocity protocol (LLP), each completing 4 sets of 8 repetitions. Before and after each protocol, the following were assessed: voluntary activation using muscle stimulation and the interpolated twitch technique as a measure of central fatigue, and contractile properties evoked with electrical stimulation as a measure of peripheral fatigue. The LLP of the knee extensor muscles induced greater reductions in isometric force than the HLP (P < 0.05) (21% vs. 12% reduction) across all four exercise sets, resulting in greater fatigability for the LLP. A more rapid recovery of MVIC force for the young adults compared to the old was observed (P < 0.05). The LLP also showed a greater reduction in the rate of force development than the HLP (P < 0.05). The reduction in MVIC force was associated with the reductions in twitch amplitude (r² = 0.368, P < 0.001) and voluntary activation (r2 = 0.209, P 0.05). The LLP protocol induced greater fatigability of the knee extensor muscles than the HLP, evidenced by greater reductions in MVIC. Muscular mechanisms were the primary contributor to the differences with a smaller contribution from neural mechanisms.
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