Ultrastructural Muscle Damage In Young Versus Older Men After High-Volume, Heavy Resistance Strength Training

By Ty Sevin, Aug 31, 2021

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Roth SM, Martel GF, Ivey FM, Lemmer JT, Tracy BL, Hurlbut DE, Metter EJ, Hurley BF, Rogers MA. Department of Kinesiology, University of Maryland College Park, College Park, Maryland 20742, USA.


The purpose of this study was to compare the effects of heavy resistance strength training on ultrastructural muscle damage in young and older men. Fifteen healthy untrained men, 7 young (20-30yr) and 10 older (65-75yr) completed a 9 week unilateral leg extension, heavy resistance strength training program, consisting of 5 sets of 5-20 repetitions 3 days a week. Biopsies of leg muscle were taken before and after the training program to determine muscle damage.


Both the young and older men increased strength significantly, 26 and 25% respectively. The older men also showed a significant increase in muscle strength (13%) in the untrained leg (attributed to cross-education of the limb). Biopsies after the 9 weeks of HRST revealed that muscle damage was significant in both training groups, however no significant differences existed between groups.


Past research has indicated that older skeletal muscle may be more susceptible to muscle damage than young muscle. This is the first study to show that high-volume HRST leads to similar increases in muscle damage in both young and older men. The data reveals heavy resistance strength training results in significant strength gains for young and older men with no significant difference in risk of muscle damage.

Keiser Equipment Used

Leg extension machine

Published in the Journal of Applied Physiology, 1999 Jun;86(6):1833-40

Link to Original Research

About the author

Ty Sevin

Director of Human Performance, Education and Research

Articles by Ty Sevin >

With over 25 years of coaching experience at both the collegiate and Olympic levels, Ty Sevin is one of the most influential track and field coaches in the country. Ty has worked for the United States Olympic Committee, serving as the Director of the Track and Field Residency Program at the USOC Olympic Training Center in Chula Vista, CA. He has also served as an assistant coach for Team USA on three separate occasions, for both the men’s and women’s teams. Ty himself was a four-time U.S. Olympics Trials qualifier in javelin. Ty most recently spent four years as the Associate Head Coach at the University of Texas at Austin for both the men’s and women’s track and field teams. Prior to that, he led the men’s and women’s track and cross-country teams at the University of New Orleans and McNeese State.

Currently, Ty applies his vast industry experience to the role of Director of Human Performance, Research and Education for Keiser Corporation, where he consults with college and professional sports teams regarding the utilization of Keiser strength equipment. He is also responsible for creating educational curriculum relating to human performance and overseeing Keiser research projects