A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Cortical and spinal responses to short-term strength training and detraining in young and older adults in rectus femoris muscle (2024)
Gomez-Guerrero, G., Avela, J., Jussila, I., Pihlajamäki, E., Deng, F.-Y., Kidgell, D. J., Ahtiainen, J. P., & Walker, S. (2024). Cortical and spinal responses to short-term strength training and detraining in young and older adults in rectus femoris muscle. European Journal of Applied Physiology, Early online. https://doi.org/10.1007/s00421-024-05443-0
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Gomez-Guerrero, Gonzalo; Avela, Janne; Jussila, Ilkka; Pihlajamäki, Esa; Deng, Fu-Yu; Kidgell, Dawson J.; Ahtiainen, Juha P.; Walker, Simon
Lehti tai sarja: European Journal of Applied Physiology
ISSN: 1439-6319
eISSN: 1439-6327
Julkaisuvuosi: 2024
Ilmestymispäivä: 05.03.2024
Volyymi: Early online
Kustantaja: Springer
Julkaisumaa: Saksa
Julkaisun kieli: englanti
DOI: https://doi.org/10.1007/s00421-024-05443-0
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/93948
Tiivistelmä
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.
YSO-asiasanat: ikääntyminen; ikääntyneet; kestävyysharjoittelu; voimaharjoittelu; reidet
Vapaat asiasanat: aging; resistance training; TMS; lumbar stimulation; cortico-spinal excitability; lower-limbs
Liittyvät organisaatiot
OKM-raportointi: Kyllä
VIRTA-lähetysvuosi: 2024
Alustava JUFO-taso: 1