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European Journal of Applied Physiology

Open Access 05-03-2024 | Motor Evoked Potential | Original Article

Cortical and spinal responses to short-term strength training and detraining in young and older adults in rectus femoris muscle

Authors: Gonzalo Gomez-Guerrero, Janne Avela, Ilkka Jussila, Esa Pihlajamäki, Fu-Yu Deng, Dawson J. Kidgell, Juha P. Ahtiainen, Simon Walker

Published in: European Journal of Applied Physiology

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Abstract

Introduction

Strength training mitigates the age-related decline in strength and muscle activation but limited evidence exists on specific motor pathway adaptations.

Methods

Eleven young (22–34 years) and ten older (66–80 years) adults underwent five testing sessions where lumbar-evoked potentials (LEPs) and motor-evoked potentials (MEPs) were measured during 20 and 60% of maximum voluntary contraction (MVC). Ten stimulations, randomly delivered, targeted 25% of maximum compound action potential for LEPs and 120, 140, and 160% of active motor threshold (aMT) for MEPs. The 7-week whole-body resistance training intervention included five exercises, e.g., knee extension (5 sets) and leg press (3 sets), performed twice weekly and was followed by 4 weeks of detraining.

Results

Young had higher MVC (~ 63 N·m, p = 0.006), 1-RM (~ 50 kg, p = 0.002), and lower aMT (~ 9%, p = 0.030) than older adults at baseline. Young increased 1-RM (+ 18 kg, p < 0.001), skeletal muscle mass (SMM) (+ 0.9 kg, p = 0.009), and LEP amplitude (+ 0.174, p < 0.001) during 20% MVC. Older adults increased MVC (+ 13 N·m, p = 0.014), however, they experienced decreased LEP amplitude (− 0.241, p < 0.001) during 20% MVC and MEP amplitude reductions at 120% (− 0.157, p = 0.034), 140% (− 0.196, p = 0.026), and 160% (− 0.210, p = 0.006) aMT during 60% MVC trials. After detraining, young and older adults decreased 1-RM, while young adults decreased SMM.

Conclusion

Higher aMT and MEP amplitude in older adults were concomitant with lower baseline strength. Training increased strength in both groups, but divergent modifications in cortico-spinal activity occurred. Results suggest that the primary locus of adaptation occurs at the spinal level.
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Metadata
Title
Cortical and spinal responses to short-term strength training and detraining in young and older adults in rectus femoris muscle
Authors
Gonzalo Gomez-Guerrero
Janne Avela
Ilkka Jussila
Esa Pihlajamäki
Fu-Yu Deng
Dawson J. Kidgell
Juha P. Ahtiainen
Simon Walker
Publication date
05-03-2024
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Applied Physiology
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-024-05443-0