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Musculoskeletal response to exercise is greatest in women with low initial values.
Med Sci Sports Exerc. 2003 Oct; 35(10):1691-6.MS

Abstract

INTRODUCTION

The "initial values" principle of exercise training states those with the lowest initial values of a physiologic system have the greatest capacity for improvement in response to training. We sought to determine whether initial values predicted the musculoskeletal response to training in premenopausal women (N = 31) who participated in a 1-yr program of resistance and jump training designed to improve physical indices of fracture risk. Significant improvements in trochanteric bone mineral density (BMD), hip abductor strength, power, and postural stability occurred in response to training.

METHODS

To determine the predictive power of initial values, we performed separate stepwise regression analyses for each variable including the following dependent variables: age, initial value, highest weight lifted during training, and total number of exercise sessions attended.

RESULTS

In each case, the initial value was the most significant predictor of percent change in response to training. Initial values explained 15-29% of the variance in the magnitude of the training response. For each unit lower BMD of the greater trochanter (0.01 g.cm-2), the training response was 12% greater. For each unit decrease in initial strength (1 N.m), power (1 W), and stability (1 SI unit), the training response was 1.0%, 0.2%, and 8.0% greater, respectively. When categorized by quartile of initial values, women in the lowest quartile had two- to fivefold greater improvements in musculoskeletal measures than those in the upper quartile.

CONCLUSION

Women who began training with the lowest initial values had the greatest improvements in hip BMD, hip abductor strength, leg power, and postural stability. These results support the training principle of initial values and suggest that this training program may be most successful in premenopausal women with lower values of musculoskeletal indices of fracture risk.

Authors+Show Affiliations

Bone Research Laboratory, Department of Exercise Science, Oregon State University, Corvallis, OR, USA. wintersk@ohsu.eduNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

14523306

Citation

Winters-Stone, Kerri M., and Christine M. Snow. "Musculoskeletal Response to Exercise Is Greatest in Women With Low Initial Values." Medicine and Science in Sports and Exercise, vol. 35, no. 10, 2003, pp. 1691-6.
Winters-Stone KM, Snow CM. Musculoskeletal response to exercise is greatest in women with low initial values. Med Sci Sports Exerc. 2003;35(10):1691-6.
Winters-Stone, K. M., & Snow, C. M. (2003). Musculoskeletal response to exercise is greatest in women with low initial values. Medicine and Science in Sports and Exercise, 35(10), 1691-6.
Winters-Stone KM, Snow CM. Musculoskeletal Response to Exercise Is Greatest in Women With Low Initial Values. Med Sci Sports Exerc. 2003;35(10):1691-6. PubMed PMID: 14523306.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Musculoskeletal response to exercise is greatest in women with low initial values. AU - Winters-Stone,Kerri M, AU - Snow,Christine M, PY - 2003/10/3/pubmed PY - 2004/4/7/medline PY - 2003/10/3/entrez SP - 1691 EP - 6 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 35 IS - 10 N2 - INTRODUCTION: The "initial values" principle of exercise training states those with the lowest initial values of a physiologic system have the greatest capacity for improvement in response to training. We sought to determine whether initial values predicted the musculoskeletal response to training in premenopausal women (N = 31) who participated in a 1-yr program of resistance and jump training designed to improve physical indices of fracture risk. Significant improvements in trochanteric bone mineral density (BMD), hip abductor strength, power, and postural stability occurred in response to training. METHODS: To determine the predictive power of initial values, we performed separate stepwise regression analyses for each variable including the following dependent variables: age, initial value, highest weight lifted during training, and total number of exercise sessions attended. RESULTS: In each case, the initial value was the most significant predictor of percent change in response to training. Initial values explained 15-29% of the variance in the magnitude of the training response. For each unit lower BMD of the greater trochanter (0.01 g.cm-2), the training response was 12% greater. For each unit decrease in initial strength (1 N.m), power (1 W), and stability (1 SI unit), the training response was 1.0%, 0.2%, and 8.0% greater, respectively. When categorized by quartile of initial values, women in the lowest quartile had two- to fivefold greater improvements in musculoskeletal measures than those in the upper quartile. CONCLUSION: Women who began training with the lowest initial values had the greatest improvements in hip BMD, hip abductor strength, leg power, and postural stability. These results support the training principle of initial values and suggest that this training program may be most successful in premenopausal women with lower values of musculoskeletal indices of fracture risk. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/14523306/Musculoskeletal_response_to_exercise_is_greatest_in_women_with_low_initial_values_ L2 - https://doi.org/10.1249/01.MSS.0000089338.66054.A5 DB - PRIME DP - Unbound Medicine ER -