Effects of NMES-elicited versus voluntary low-level conditioning contractions on explosive knee extensions.
J Musculoskelet Neuronal Interact
; 22(4): 465-473, 2022 12 01.
Article
em En
| MEDLINE
| ID: mdl-36458384
ABSTRACT
OBJECTIVES:
Electrically-induced or voluntary conditioning-contractions (CC) can be used to affect contractile properties of a subsequent explosive contraction (EC). Here, we aimed at comparing the effect of neuromuscular-electrical-stimulation (NMES) vs voluntary CC performed prior to explosive contractions of the knee extensors.METHODS:
A 10 sec NMES CC (100Hz, 1000µs, 10% MVC), or a voluntary contraction (VOL CC) mimicking the NMES CC, preceded an isometric EC of the knee extensors. Explosive contraction was performed with the goal to reach the target (70% MVC) as quickly as possible.RESULTS:
All the parameters related with the explosive contractions' muscle-output were similar between protocols (difference ranging from 0.23%, Mean Torque; to 5.8%, Time to Target), except for the Time to Peak Torque, which was lower when preceded by NMES (11.1%, p=0.019). Interestingly, the RTD 0-50 ms_EC was 37.3% higher after the NMES compared with the VOL CC protocol.CONCLUSION:
Explosive contraction was potentiated by an NMES CC as compared with a voluntary CC. This may be due to a reduction in descending drive following VOL CC, which has been shown to occur even with low-level voluntary efforts. These findings could be used to improve rehabilitation or training protocols that include conditioning contractions.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Substâncias Explosivas
Idioma:
En
Revista:
J Musculoskelet Neuronal Interact
Assunto da revista:
FISIOLOGIA
/
NEUROLOGIA
/
ORTOPEDIA
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Itália