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The Journal of Sports Medicine and Physical Fitness 2023 June;63(6):765-72

DOI: 10.23736/S0022-4707.23.14571-3

Copyright © 2023 THE AUTHORS

This is an open access article distributed under the terms of the CC BY-NC 4.0 license which allows users to distribute, remix, adapt and build upon the manuscript, as long as this is not done for commercial purposes, the user gives appropriate credits to the original author(s) and the source (with a link to the formal publication through the relevant DOI), provides a link to the license and indicates if changes were made.

lingua: Inglese

Effects of resistance training on bone mineral density and resting serum hormones in female collegiate distance runners: a randomized controlled pilot trial

Tetsuro KOBAYASHI 1 , Shotaro SEKI 2, Inkwan HWANG 2

1 Graduate School of Health and Sport Science, Nippon Sport Science University, Tokyo, Japan; 2 Faculty of Sport Science, Nippon Sport Science University, Kanagawa, Japan

BACKGROUND: Studies report low bone mineral density (BMD) in female distance runners. We aimed to investigate changes in BMD and resting serum hormones, including dehydroepiandrosterone sulfate (DHEA-S) and estradiol (E2), before and after resistance training (RT) interventions in female collegiate distance runners.
METHODS: Fourteen female collegiate distance runners (age, 19.8±0.8 years) and 14 age-matched healthy young women as controls (age, 20.5±1.6 years) were included and divided into RT groups and controls (runner with RT, RRT; runner controls, RCON; non-athlete with RT, NRT; non-athlete controls, NCON). The RRT and NRT groups performed squats and deadlifts at 60-85% 1RM load for one session of five sets of five repetitions, twice a week for 16 weeks. BMD of the total body, lumbar spine L2-L4, and femoral neck was measured by dual-energy X-ray absorptiometry scanning. Resting serum cortisol, adrenocorticotropic hormone, testosterone, growth hormone, insulin-like growth factor 1, DHEA-S, progesterone, E2, procollagen type I N-terminal propeptide (P1NP), and N-terminal telopeptide were assayed.
RESULTS: The results showed a significant increase in total body BMD in both the RRT and NRT (both P<0.05) groups. P1NP in the RRT group increased significantly after RT, and the increase was higher than in the RCON (P<0.05). Conversely, no significant changes were observed in resting blood hormone levels for all measurements in all groups (all P>0.05).
CONCLUSIONS: These findings suggest that 16 weeks of RT in female collegiate distance runners may increase total body BMD.

KEY WORDS: Bone and bones; Female; Athletes; Relative energy deficiency in sport; Weight lifting

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