The effect of a lower extremity kinematic constraint on lifting biomechanics.
Appl Ergon
; 42(6): 867-72, 2011 Nov.
Article
em En
| MEDLINE
| ID: mdl-21397210
ABSTRACT
Leaning against a stationary barrier during manual materials handling tasks is observed in many industrial environments, but the effects of this kinematic constraint on low back mechanics are unknown. Thirteen participants performed two-handed lifting tasks using both a leaning posture and no leaning posture while trunk kinematics, muscle activity and ground reaction force were monitored. Results revealed that lifting with the leaning posture required significantly less activity in erector spinae (26% vs. 36% MVC) and latissimus dorsi (8% vs. 14% MVC), and less passive tissue moment compared with the no leaning posture. Peak sagittal accelerations were lower when leaning, but the leaning posture also had significantly higher slip potential as measured by required coefficient of friction (0.05 vs. 0.36). The results suggested that the leaning lifting strategy provides reduced low back stress, but does so at the cost of increased slip potential.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fenômenos Biomecânicos
/
Remoção
/
Região Lombossacral
Limite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Appl Ergon
Ano de publicação:
2011
Tipo de documento:
Article