Ross van der Werff, Shaun O'Leary, Gwendolen Jull, Michael Peolsson, Johan Trygg, Anneli Peolsson
NHMRC CCRE (Spinal Pain, Injury and Health), The University of Queensland, 4072 Brisbane, QLD, Australia
DOI: 10.2340/16501977-1822

Objective: To evaluate the capacity of the ultrasound-based method of speckle tracking analysis to detect changes in multilayered dorsal neck muscle activity induced by performing a lifting task.
Subjects: Twenty-one healthy individuals.
Design: Participants performed a loaded lifting task in 3 different postural orientations of the neck (neutral, flexed and forward head posture). Ultrasound images were recorded and speckle tracking analysis was used to quantify muscle deformation and deformation rate over 3 equal time-periods during the lifting sequence (rest, mid-lift and end-lift).
Results: Significant main effects of postural orientation for the deformation measure (p < 0. 05) and time for the deformation rate measure (p < 0. 05) were observed in all dorsal muscles examined. Significant time by postural interactions for the deformation measure were observed in the trapezius, semispinalis cervicis and multifidus (p < 0. 05) and in the semispinalis cervicis (p < 0. 05) for the deformation rate measure.
Conclusion: Speckle tracking analysis ultrasound measurements can detect differences in multilayered muscle activity of the dorsal neck induced by postural variations during a lifting task. Findings for the deformation and the deformation rate measures suggest that they quantify a different, albeit related, mechanical event during muscle contraction in a functional task such as lifting.