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Trunk Rotation Essay

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Clinicians frequently assess movement performance during a trunk rotation task to observe
19 biomechanical deficits. The degeneration of the sensory (Brumagne et al., 2004) and motor systems (Horak et
20 al., 1989) is inevitable as age increases; thereby altered movement and/or postural control in older adults is
21 apparent.(Pyykko et al., 1990) For example, compared to younger adults, older adults show less rotational
22 ROM of the cervical spine (Trott et al., 1996) and of the thoracic spine (Baird and Van Emmerik, 2009) during
23 axial trunk rotation while standing as well as in sitting (Doriot and Wang, 2006). A comprehensive
24 investigation on different directions of rotation is required since trunk asymmetry exists during daily activities. …show more content…

Such differences have the potential to contribute to variations in the kinematics and
39 shoulder-pelvic coordination in older adults with recurrent LBP.
40 In our study, the RP was defined by the kinematic differences between the angle of the shoulder and
41 pelvis during two phases of trunk rotation. The coordinated rotation of RP was investigated during rotation
42 from the left to the right side (RP1) as well as during the return phase to the left side (RP2). In addition, the
43 shoulder and pelvis ROM during trunk rotation was also investigated while considering individual
44 characteristics, such as age and BMI. Therefore, the purpose of this study was to compare changes in
45 kinematic differences of angular displacements with shoulder and pelvis ROM as well as RP based on trunk
46 coordination in different directions of rotation in older adults with and without recurrent LBP.
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48 Methods
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50 Subjects were recruited from the University community, and those subjects who met study inclusion
51 criteria received information regarding the study and signed a copy of the Institutional Review Board approved
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consent form (IRB#8-15B). The participants were included in the study if 52 they: 1) were 50 years of age …show more content…

A VAS for pain intensity provides a quantitative measure of subjective pain and a total functional
68 disability score ranging from 0 to 100 mm.(Huskisson, 1983) The pain was generally rated during the
69 individual’s daily activities.
70 As indicated in Figure 1, in order to capture the angular displacement of trunk rotation, reflective
71 markers were attached to the bilateral shoulders, the first thoracic spine (T1), the 10th thoracic spine (T10), the
72 first sacrum (S1), and the bilateral posterior superior iliac spines (PSIS). Six digital cameras captured the
73 motion of each marker three-dimensionally (Motion Analysis Corporation, Santa Rosa, CA, USA). The signals
74 from the marker trajectories were filtered with a fourth-order zero-phase Butterworth low-pass filter with a
75 cutoff frequency of 6 Hz to eliminate noise from the raw data with the sampling rate at 100 Hz. The captured
76 data was recorded in a personal computer and further analyzed by customized software in MATLAB (The
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MathWorks, I 77 nc. Natick, Massachusetts,

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