Changes In Power With Resistance Training In Older And Younger Men And Women

By Ty Sevin, Sep 01, 2021

< Back to Benefits of Strength Training on Strength and Power Gains in Older Adults

Jozsi AC, Campbell WW, Joseph L, Davey SL, Evans WJ. Noll Physiological Research Center and the Department of Physiology, The Pennsylvania State University, University Park, USA.


Research clearly demonstrates that older people and younger people exhibit similar gains in muscle strength through progressive resistance training (PRT). However, few studies have focused on changes in muscle power with age. This study examined the influence of progressive resistance training (PRT) on muscle power output in 17 men and women aged 56-66 years, and compared their responses to 15 men and women aged 21-30 years. Twice weekly for 12 weeks, all subjects performed PRT using five exercises, three sets per exercise at 80% of their one repetition maximum (1RM). Muscle power was measured (isotonically) on the knee extension and arm pull machines, at resistances equivalent to 40, 60, and 80% of the 1RM.


All subjects independent of age or sex, increased arm pull power similarly at 40 and 60% of 1RM but did not exhibit a significant increase in arm pull power at 80% of 1RM. Older and younger subjects also had similar increases in leg extensor power at 40 and 60% of 1RM, but men responded with greater absolute gains than women at these percentages (p < .05). The increase in leg extensor power at 80% of 1RM was similar in all groups. In regard to strength, older and younger subjects increased similarly in all exercises except the left knee extension. Independent of age, men increased strength more than women in all exercises except the double leg press. 


These results demonstrate that healthy older individuals, male and female, can significantly improve muscle power with progressive resistance training. These improvements are on the same magnitude as those realized by younger adults performing the same exercises. This is very significant research because previous studies have shown that leg muscle power is more important than leg strength in performing daily activities such as stair climbing, rising from a chair and walking. More research is needed to determine if training at 80% of 1RM is the optimal protocol for improving power.

Keiser Equipment Used

Seated chest press, arm pull, unilateral knee extension, bilateral leg curl, bilateral leg press.

Published in the Journal of Gerontology, A Biol Sci Med Sci 1999 Nov;54(11):M591-6

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