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Fredrick Gardin

Column-editor : James M. Mensch

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Tamerah Hunt and Fredrick Gardin

Column-editor : James M. Mensch

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Simon Wang and Stuart M. McGill

Spine stability is ensured through isometric coactivation of the torso muscles; however, these same muscles are used cyclically to assist ventilation. Our objective was to investigate this apparent paradoxical role (isometric contraction for stability or rhythmic contraction for ventilation) of some selected torso muscles that are involved in both ventilation and support of the spine. Eight, asymptomatic, male subjects provided data on low back moments, motion, muscle activation, and hand force. These data were input to an anatomically detailed, biologically driven model from which spine load and a lumbar spine stability index was obtained. Results revealed that subjects entrained their torso stabilization muscles to breathe during demanding ventilation tasks. Increases in lung volume and back extensor muscle activation coincided with increases in spine stability, whereas declines in spine stability were observed during periods of low lung inflation volume and simultaneously low levels of torso muscle activation. As a case study, aberrant ventilation motor patterns (poor muscle entrainment), seen in one subject, compromised spine stability. Those interested in rehabilitation of patients with lung compromise and concomitant back troubles would be assisted with knowledge of the mechanical links between ventilation during tasks that impose spine loading.

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Lauren Anne Lipker, Caitlyn Rae Persinger, Bradley Steven Michalko and Christopher J. Durall

cuff dimensions were not reported. Total inflation time could not be calculated from the study data. The exercises consisted of straight leg raises, hip joint abduction, hip joint adduction, half squats, step-ups, resisted knee flexion with elastic tubing, and knee-bending walking exercises. Subjects

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Joshua T. Slysz and Jamie F. Burr

intervention group was accomplished using an automated tourniquet system (Zimmer Automated Tourniquet System 1500 model; Soma Technology Inc, Bloomfield, CT) with periodic inflation to 220 mm Hg. An individual intervention session comprised of 3 cycles of 4-minute inflation, 4-minute deflation. The tourniquet

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Jeff A. Nessler, Thomas Hastings, Kevin Greer and Sean C. Newcomer

according to manufacturer guidelines. For trials that required inflation of the bladder, consistency in air pressure was achieved by performing a predetermined number of strokes with a manual bicycle pump (5 strokes for medium sized vest and 8 strokes for large sized vest). The number of strokes was

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Jennifer Ostrowski, Angelina Purchio, Maria Beck and JoLynn Leisinger

range of 5–75 mm Hg), during which the sleeve undergoes cycles of 3-minute inflation and 1-minute deflation during the entire treatment time. The PP intermittent compression can be applied with either a gel pack insert or wetted IB inserts. Previous research has found that the wetted IB inserts produce

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Robert D. Catena, Nigel Campbell, Alexa L. Werner and Kendall M. Iverson

(although to be expected) high collinearity (variance inflation factor > 10) within anthropometric measure categories (eg, the torso depth was highly correlated with gestational age). We also observed high collinearity between torso anthropometry and BMI. We had to account for this high collinearity and

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Zachary W. Bell, Scott J. Dankel, Robert W. Spitz, Raksha N. Chatakondi, Takashi Abe and Jeremy P. Loenneke

reached a pressure that they deemed to be a moderate pressure with no pain (7 out of 10), they were asked to verbally state the word “7” (in line with the recommendations of Wilson et al 3 ). In the likelihood that AOP was found before participants rated their 7 out of 10, inflation of the cuff was

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Sinéad O’Keeffe, Niamh Ní Chéilleachair and Siobhán O’Connor

AFAQ1 scores could be predicted by injury severity and injury history in the previous 12 months. Multicollinearity of the multiple regression analysis was first examined by inspecting the correlation coefficients and variance inflation factors, with high correlation ( r  > .9) and variance inflation