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Lipolytic, Hormonal, and Muscle Quality Differences of Female Endurance Athletes with Higher vs Lower Body Fat.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Lipolytic, Hormonal, and Muscle Quality Differences of Female Endurance Athletes with Higher vs Lower Body Fat./
作者:	Ragland, Tristan Joseph.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	97 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-04, Section: B.
Contained By:	Dissertations Abstracts International83-04B.
標題:	Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28542879
ISBN:	9798460428908

Lipolytic, Hormonal, and Muscle Quality Differences of Female Endurance Athletes with Higher vs Lower Body Fat.
Ragland, Tristan Joseph.

Lipolytic, Hormonal, and Muscle Quality Differences of Female Endurance Athletes with Higher vs Lower Body Fat. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 97 p.

Source: Dissertations Abstracts International, Volume: 83-04, Section: B.

Thesis (Ph.D.)--The Florida State University, 2021.

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

IntroductionThe popularity of endurance events has grown recently with an increased number of participants who have an elevated body fat percentage. The influence of chronic endurance training on adipose tissue physiology in these recreational athletes is unknown. The purpose of this investigation was to determine the effect of chronic endurance training on lipolytic rate and measurements of muscle quality (MQ) between two groups of female endurance athletes with two different levels of body fatness.MethodsFemale endurance athletes (N=14) with >8 yrs of training experience were divided based on body fat % into lower body fat (LBF; N=5, age=32.1±8.2yrs, BF%=19.4±4.7%, BMI=21.8±1.7kg/m2) or higher body fat (HBF; N=9, age=36.1±8.3 yrs, BF%=31.1±3.1%, BMI=23.9±3.2 kg/m2) groups based upon a BF cut-off of the 30th percentile. Two visits were completed: 1) anthropometrics, BF%, fitness, strength, and MQ testing. US histogram analysis and isokinetic force production of the rectus femoris were used to quantify MQ (IMF% and N-m/cm2), and 2) SCAAT lipolysis was measured 1 hr before, during cycling at ~70% VO2peak for 45 min, and after exercise for 2h.ResultsSCAAT lipolysis was not significantly different pre-exercise or not post-exercise (p > 0.05). However, there was a significant difference during exercise F(1,12) =15.01, p=.002, n2=.556 (LBF=3090.6±1394.1µM, HBF=1003.2±654.3µM) between groups. There were no significant differences between groups in insulin or growth hormone (p > 0.05). There were no significant differences between groups in muscle quality with IMF% (p > 0.05).ConclusionChronic endurance exercise training of recreational female athletes appears to alleviate the expected decrements in muscle quality due to excess adiposity among individuals in the EBF group; however, there remains a lower resting and exercise-induced lipolysis in the HBF than LBF group. Further investigations should consider possible mechanisms or lifestyle factors contributing to these observed differences.

ISBN: 9798460428908Subjects--Topical Terms:

518431
Physiology.
Subjects--Index Terms:

Exercise

Lipolytic, Hormonal, and Muscle Quality Differences of Female Endurance Athletes with Higher vs Lower Body Fat.
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520 $a IntroductionThe popularity of endurance events has grown recently with an increased number of participants who have an elevated body fat percentage. The influence of chronic endurance training on adipose tissue physiology in these recreational athletes is unknown. The purpose of this investigation was to determine the effect of chronic endurance training on lipolytic rate and measurements of muscle quality (MQ) between two groups of female endurance athletes with two different levels of body fatness.MethodsFemale endurance athletes (N=14) with >8 yrs of training experience were divided based on body fat % into lower body fat (LBF; N=5, age=32.1±8.2yrs, BF%=19.4±4.7%, BMI=21.8±1.7kg/m2) or higher body fat (HBF; N=9, age=36.1±8.3 yrs, BF%=31.1±3.1%, BMI=23.9±3.2 kg/m2) groups based upon a BF cut-off of the 30th percentile. Two visits were completed: 1) anthropometrics, BF%, fitness, strength, and MQ testing. US histogram analysis and isokinetic force production of the rectus femoris were used to quantify MQ (IMF% and N-m/cm2), and 2) SCAAT lipolysis was measured 1 hr before, during cycling at ~70% VO2peak for 45 min, and after exercise for 2h.ResultsSCAAT lipolysis was not significantly different pre-exercise or not post-exercise (p > 0.05). However, there was a significant difference during exercise F(1,12) =15.01, p=.002, n2=.556 (LBF=3090.6±1394.1µM, HBF=1003.2±654.3µM) between groups. There were no significant differences between groups in insulin or growth hormone (p > 0.05). There were no significant differences between groups in muscle quality with IMF% (p > 0.05).ConclusionChronic endurance exercise training of recreational female athletes appears to alleviate the expected decrements in muscle quality due to excess adiposity among individuals in the EBF group; however, there remains a lower resting and exercise-induced lipolysis in the HBF than LBF group. Further investigations should consider possible mechanisms or lifestyle factors contributing to these observed differences.
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