Influence of Different Spinal Alignments in Sitting on Trunk Muscle Activity

Miura, Tatsuhiro; Sakuraba, Keishoku

doi:10.1589/jpts.25.483

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…A reduction in the EMG activity of trunk muscles in slumped sitting has been reported consistently in the literature 36 , 37 ) . When postural muscle activity decreases, the lumbopelvic region becomes dependent on its passive structures to maintain the position against gravity at end-range spine flexion 38 ) .…”

Section: Discussionmentioning

confidence: 60%

Perceived body discomfort and trunk muscle activity in three prolonged sitting postures

2015

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[Purpose] This study aimed to investigate the perceived discomfort and trunk muscle activity in three different 1-hour sitting postures. [Subjects] A repeated-measures design study was conducted on 10 healthy subjects. [Methods] Each subject sat for an hour in three sitting postures (i.e., upright, slumped, and forward leaning sitting postures). Subjects rated perceived body discomfort using Borg’s CR-10 scale at the beginning and after 1 hour sitting. The electromyographic activity of the trunk muscle activity was recorded during the 1-hour period of sitting. [Results] The forward leaning sitting posture led to higher Borg scores in the low back than those in the upright (p = 0.002) and slumped sitting postures (p < 0.001). The forward leaning posture was significantly associated with increased iliocostalis lumborum pars thoracis (ICL) and superficial lumbar multifidus (MF) muscle activity compared with the upright and slumped sitting postures. The upright sitting posture was significantly associated with increased internal oblique (IO)/transversus abdominis (TrA) and ICL muscle activity compared with the slumped sitting posture. [Conclusion] The sitting posture with the highest low back discomfort after prolonged sitting was the forward leaning posture. Sitting in an upright posture is recommended because it increases IO/TrA muscle activation and induces only relatively moderate ICL and MF muscle activation.

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Section: Discussionmentioning

confidence: 60%

Perceived body discomfort and trunk muscle activity in three prolonged sitting postures

2015

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“…A Dutch population-based study reported that a sedentary lifestyle posed a higher risk of chronic NSLBP because of low activity levels 20 ) . Actually, activity levels of trunk muscles in sitting postures and spinal pelvic movement in sitting is very low (less than 15% maximal voluntary contraction; MVC) as previously reported by Miura et al 21 , 22 ) . Moreover it has been reported that muscle activity levels of the trunk extensors in daily living is 20−30%MVC 23 ) .…”

Section: Introductionmentioning

confidence: 72%

Properties of Force Output and Spectral EMG in Young Patients with Nonspecific Low Back Pain during Isometric Trunk Extension

Miura

Sakuraba

2014

J Phys Ther Sci

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[Purpose] To clarify the influence of nonspecific low back pain (NSLBP) on force fluctuation and the myoelectric data of back muscles during isometric trunk extension at low to high force levels. [Subjects] Fourteen male subjects with NSLBP and 14 healthy male control subjects participated in this study. [Methods] All participants extended their trunk isometrically maintaining 10 levels of target force [2, 5, 10, 15, 20, 30, 50, 70, 80 and 90% of maximal voluntary contraction (MVC) in a random order] for about 4 seconds with visual feedback. A force transducer and tri-axis force sensor were positioned at the 7th thoracic vertebra to measure force output and the direction of force. Myoelectric activities of the back muscles (longissimus thoracis, L2 level; multifidus, S1 level) were recorded by surface electromyography. [Results] Force output of NSLBP subjects fluctuated more than that of healthy subjects at 30% and 50%MVC. Higher median power frequency in the multifidus was observed in NSLBP subjects at moderate to high force levels. [Conclusion] These results show that the properties of force output in NSLBP subjects differ from those in healthy subjects, suggesting that the assessment of force fluctuation of back muscles at moderate force levels is a useful index for evaluating and discriminating NSLBP.

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“…The site for each electrode was shaved and then cleaned with cotton and alcohol to reduce skin impedance. To normalize the EMG activity of the IO, EO, and MF muscles, the maximum voluntary isometric contraction (MVIC) of the muscles was measured using maneuvers suggested previously [ 16 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of Pelvic Floor Muscle Training Using Pressure Biofeedback on Pelvic Floor Muscle Contraction and Trunk Muscle Activity in Sitting in Healthy Women

Ko¹,

Koo

Jung³

et al. 2022

Healthcare

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Pelvic floor muscle training (PFMT) has been recommended as the first choice as one of the effective methods for preventing and improving urinary incontinence (UI). We aimed to determine whether pressure biofeedback unit training (PBUT) improves short term and retention performance of pelvic floor muscle contraction. The muscle activities of the external oblique (EO), transversus/internal oblique (TrA/IO), multifidus (MF) and the bladder base displacement were measured in the verbal feedback group (n = 10) and PBU group (n = 10) three times (baseline, post-training, and at the 1-week follow-up). Surface electromyographic activity was recorded from the EO, TrA/IO, and MF muscles. The bladder base displacement was measured using ultrasound. The results were analyzed using two way mixed ANOVA. The bladder base displacement may have elevated more in the PBU group than in the verbal feedback group due to decreased TrA/IO activity. These findings indicate that PBUT is a better method than verbal feedback training.

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Influence of Different Spinal Alignments in Sitting on Trunk Muscle Activity

Cited by 9 publications

References 22 publications

Perceived body discomfort and trunk muscle activity in three prolonged sitting postures

Perceived body discomfort and trunk muscle activity in three prolonged sitting postures

Properties of Force Output and Spectral EMG in Young Patients with Nonspecific Low Back Pain during Isometric Trunk Extension

Effect of Pelvic Floor Muscle Training Using Pressure Biofeedback on Pelvic Floor Muscle Contraction and Trunk Muscle Activity in Sitting in Healthy Women

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