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The cross-education effect in men and woman after unilateral strength training and detraining
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences.ORCID iD: 0000-0003-1848-5491
Swedish School of Sport and Health Sciences, GIH.
Swedish School of Sport and Health Sciences, GIH.
Capio Atro Clinic, Sophiahemmet, Stockholm, Sweden.
2016 (English)Conference paper, Abstract (Refereed)
Abstract [en]

Introduction

It is well known that muscle strength increases in both the untrained and trained limb after a period of unilateral strength training. However, it is not known how this so called cross-education effect (CE-effect) is affected by a long period of detraining, and if there are any sex differences. Also, there are conflicting results regarding the effect of unilateral training on muscle mass in the untrained limb.

Aim

The primary objective was to study the CE-effect in men and women after a period of unilateral strength training and detraining. The secondary objective was to study if training one limb would affect the muscle mass of the homologous opposite limb.

Method

Sixteen untrained individuals, 9 females and 7 males, completed the study. The training intervention was 10 weeks (34 sessions) of unilateral strength training (leg press (LP) and leg extension (LE) exercise). 1RM and muscle thickness (vastus lateralis) were measured pre-, post- and 20 weeks post-training.

Results

Strength (1RM) in the trained leg increased for both men and woman (LP: ~60%, LE ~20%, p<0.01), with no sex differences. However, only the men had a strength increase in the untrained leg (LP: 26%, LE: 10%, p<0.05) and the non-significant increase observed for the woman (LP: 10%, LE: 3%) was significantly smaller than the increase in the men (p<0.05). Muscle thickness increased similarly for both men and women (trained leg: ~14%, p<0.01; untrained leg: ~4%, p<0.05). The detraining period did not affect strength, but muscle thickness was reduced close to pre-training values in both men and women.

Conclusion

The results of the present study show that the CE-effect is larger in men than women, and that it is long lasting (at least 20 weeks). Further, strength training of one leg can increase the muscle mass of the homologous opposite leg.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Cross-education, strength training, hypertrophy
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-4646OAI: oai:DiVA.org:gih-4646DiVA: diva2:1048856
Conference
INTERNATIONAL CONFERENCE ON STRENGTH TRAINING, Kyoto, Nov 30 - Dec 2, 2016
Funder
Swedish National Centre for Research in Sports
Available from: 2016-11-22 Created: 2016-11-22 Last updated: 2016-12-05Bibliographically approved

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Citation style
  • apa
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