Hypertrophy in the cervical muscles and thoracic discs in bed rest?

Journal article


Belavy, Daniel, Miokovic, Tanja, Armbrecht, Gabriele and Felsenberg, Dieter. (2013). Hypertrophy in the cervical muscles and thoracic discs in bed rest? Journal of Applied Physiology. 115(5), pp. 586 - 596. https://doi.org/10.1152/japplphysiol.00376.2013
AuthorsBelavy, Daniel, Miokovic, Tanja, Armbrecht, Gabriele and Felsenberg, Dieter
Abstract

The impact of prolonged bed rest on the cervical and upper thoracic spine is unknown. In the 2nd Berlin BedRest Study (BBR2-2), 24 male subjects underwent 60-day bed rest and performed either no exercise, resistive exercise, or resistive exercise with whole body vibration. Subjects were followed for 2 yr after bed rest. On axial cervical magnetic resonance images from the skull to T3, the volumes of the semispinalis capitis, splenius capitis, spinalis cervicis, longus capitis, longus colli, levator scapulae, sternocleidomastoid, middle and posterior scalenes, and anterior scalenes were measured. Disc height, anteroposterior width, and volume were measured from C2/3 to T6/7 on sagittal images. The volume of all muscles, with the exception of semispinalis capitis, increased during bed rest (P < 0.025). There were no significant differences between the groups for changes in the muscles. Increased upper and midthoracic spine disc height and volume (P < 0.001) was seen during bed rest, and disc height increases persisted at least 6 mo after bed rest. Increases in thoracic disc height were greater (P = 0.003) in the resistive vibration exercise group than in control. On radiological review, two subjects showed new injuries to the mid-lower thoracic spine. One of these subjects reported a midthoracic pain incident during maximal strength testing before bed rest and the other after countermeasure exercise on day 3 of bed rest. We conclude that bed rest is associated with increased disc size in the thoracic region and increases in muscle volume at the neck. The exercise device needs to be modified to ensure that load is distributed in a more physiological fashion.

Year2013
JournalJournal of Applied Physiology
Journal citation115 (5), pp. 586 - 596
ISSN8750-7587
Digital Object Identifier (DOI)https://doi.org/10.1152/japplphysiol.00376.2013
Page range586 - 596
Publisher's version
File Access Level
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