Effects of asparagus by-product supplementation on muscle mass and strength following resistance training and detraining in healthy males

Name: Barakat Denben.

LCSH: Kasetsart University -- Theses. M.S. (Sports and Exercise Science) 2023.

Classification :.LCCS: QP321

LCSH: Kasetsart University. -- Department of Sports Science and Health -- Theses.

LCSH: Muscle strength.

LCSH: Muscles.

LCSH: Ecdysteroids

LCSH: Isometric exercise.

LCSH: Asparagus -- Utilization.

LCSH: Dietary supplements.

Abstract: 20-hydroxyecdysone (20E) are the most encountered phytoecdysteroids claiming to enhance muscle performance during resistance training (RT). Little is known about their potential ergogenic value and detraining effects post RT. A randomized control trial was conducted to examine the effects of 20E extracted from Asparagus officinalis L. on muscle strength and mass, as well as anabolic/catabolic hormones following training and detraining periods. Twenty healthy males were matched according to fat-free mass and randomly assigned to consume double-blind supplements containing either a placebo (PLA, n=10) or 30 mg/day of 20E (20E, n=10) for 12 weeks of RT and detraining period. The RT program performed 75%-80% of one-repetition maximum (1-RM), three sessions/weeks supervised by a personal trainer. Before and after training and detraining periods, body composition, circumferences, lower-and upper-muscular strength and mass, cardiorespiratory fitness, and anabolic/catabolic hormones were analyzed. This study found that supplementing with 20E decreased cortisol levels significantly (23.3% decrease, p<0.05) compared to the PLA, but had no effect on body circumference, muscle strength, or anabolic hormones post-RT was observed. In 20E, peak oxygen uptake (V̇ O2peak) increase (p<0.01) after 12 weeks RT period. Following a 6-week detraining period, the 20E consuming group showed a lower percentage change in 1RM bench press/FFM than the PLA (p<0.05). Compared to the PLA, detraining throughout 12 weeks resulted in a lower percentage change in the thigh (1.2% decrease, p<0.05) and chest (1% decrease, p<0.01) circumferences, as well as reduced cortisol levels (p<0.01) in the 20E. Furthermore, there were no significant changes in muscle mass were observed in the 20E after detraining. However, V̇ O2peak was a significant change (9.3% decrease, p<0.01) in the 20E after detraining. 20E had lower of cortisol than the PLA after 12 weeks of training (p<0.05) and detraining (p<0.01). As a result, 20E may have an anticatabolic effect during the RT period, as well as the ability to prevent muscle mass loss due to detraining by lowering catabolic hormone levels during the detraining period. We concluded 20E supplement derived from Asparagus officinalis L. hard-stem byproducts is a promising way to increase muscle mass, especially upper-body mass, during the RT period while also maintaining muscle mass and strength during detraining. Furthermore, it has not been indicated that taking supplements containing 20E extracted from Asparagus officinalis L. causes side effects that are directly related to it. Blood urea nitrogen

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Jatuporn Phoemsapthawee

Role: Thesis Advisor

Name: Ratree Ruangthai

Role: Thesis Co-Advisor

Name: Siriporn Sripinyowanich

Role: Thesis Co-Advisor

Created: 2023

Modified: 2025-06-24

Issued: 2025-06-24

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2566/barakat-denb-all.pdf

CallNumber: QP321.B37

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Sports and Exercise Science

Grantor: Kasetsart University

©copyrights Kasetsart University

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