Electromyography of muscles of posture: thigh muscles in males

Joseph, J.; Nightingale, A.

doi:10.1113/jphysiol.1954.sp005193

Cited by 54 publications

(13 citation statements)

References 5 publications

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“…In the present study, the most recruited muscular group was the quadriceps, whose concentric contractions are expected to cause a smaller proprioceptive disturbance than eccentric contractions [20], and are not primarily related to quiet standing control [6]. The cycle ergometer exercises generated different changes in SDC parameters: MP reduced more after Test1, whilst MT and mVel increased more after Test2 and Test1, respectively.…”

Section: Discussionmentioning

confidence: 95%

“…Nardone et al [5] showed that cycle ergometer exercises do not increase body sways even after exercise intensities above anaerobic threshold. Since the quadriceps is the main muscle involved in cycle ergometer exercises, these findings suggest that this muscle is not important in quiet standing control [6]. However, if the same exercise is performed at maximal intensity, the decrease of the pH can negatively modify neurotransmission and force production [7].…”

Section: Introductionmentioning

confidence: 97%

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Effects of maximal oxygen uptake test and prolonged cycle ergometer exercise on the quiet standing control

2010

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 97%

Effects of maximal oxygen uptake test and prolonged cycle ergometer exercise on the quiet standing control

2010

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“…The standing posture is maintained predominantly by posterior muscles, the so-called Guy-and-Derrick principle [2]. Invariably, only the posterior muscles in the lower legs are activated to maintain quiet stance [1,18,19]. The relative positional relationship of body segments during this quiet stance is similar under conditions of weightlessness [7], suggesting that relatively stable mechanisms for posture maintenance exist.…”

Section: Introductionmentioning

confidence: 99%

“…Continuous activity of the anterior muscles of the thigh is also observed in a few subjects [1,4,19,20,27,29,32]. However, it has not been elucidated whether the anterior or posterior postural muscle dominance is a general principle for all postural muscles throughout the body under both static and dynamic conditions.…”

Section: Introductionmentioning

confidence: 99%

Postural muscle activity patterns during standing at rest and on an oscillating floor

Fujiwara

Toyama

Kiyota

et al. 2006

Journal of Electromyography and Kinesiology

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Postural muscle activity pattern was examined in the eyes-closed state after adequate adaptation to floor anteroposterior oscillation. Twenty-three subjects were grouped almost evenly according to dominance of anterior or posterior postural muscles in the trunk and thigh during quiet stance. In the posterior-dominant group, this dominance was maintained at every frequency in most subjects. In the anterior-dominant group, this dominance was maintained in most subjects at 0.1 and 0.5Hz but changed to posterior dominance at 1.0 and 1.5 Hz in about half the subjects.Periodicity of muscle activity was evaluated by EMG amplitude spectrum at the floor oscillation frequency. Periodicity of posterior-dominant muscles in the trunk and thigh increased with increasing oscillatory frequency. In the trunk, the periodicity did not differ significantly between posterior-dominant and anterior-dominant groups. However, in the thigh, periodicity was significantly lower in the anterior-dominant muscles. This was considered to be caused by nonperiodic alternating action of the anterior and posterior muscles. In the lower leg, posterior dominance was observed in quiet stance and at all oscillation frequencies. Periodicity of soleus and gastrocnemius increased at higher frequencies and was higher in gastrocnemius than in soleus. The periodicity 5 10 15 2 difference between both muscles decreased with increasing oscillation frequency.3

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“…These postures are also associated with asymmetrical muscle efforts and abnormal disc loads. Numerous EMG studies over the past four decades support this idea [2,4,5,11,17,28,29,30,31,34,38].…”

Section: Discussionmentioning

confidence: 99%

Validation of a computer analysis to determine 3-D rotations and translations of the rib cage in upright posture from three 2-D digital images

Harrison

Janik²,

Cailliet

et al. 2006

Eur Spine J

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IntroductionHuman thoracic cage posture has been of interest since ancient times, especially deformities of the rib cage [20,25,35,36,45]. In his classic texts, Breig [8][9][10] showed that human postures can cause adverse mechanical tension on the central nervous system, thus correlating abnormal posture with disease. During the past century, thoracic posture (axial translation) has been associated with the treatment of disc degeneration and prolapse [13,37,50]. Abstract Since thoracic cage posture affects lumbar spine coupling and loads on the spinal tissues and extremities, a scientific analysis of upright posture is needed. Common posture analyzers measure human posture as displacements from a plumb line, while the PosturePrintä claims to measure head, rib cage, and pelvic postures as rotations and translations. In this study, it was decided to evaluate the validity of the PosturePrintä Internet computer system's analysis of thoracic cage postures. In a university biomechanics laboratory, photographs of a mannequin thoracic cage were obtained in different postures on a stand in front of a digital camera. For each mannequin posture, three photographs were obtained (left lateral, right lateral, and AP). The mannequin thoracic cage was placed in 68 different single and combined postures (requiring 204 photographs) in five degrees of freedom: lateral translation (Tx), lateral flexion (Rz), axial rotation (Ry), flexion-extension (Rx), and anteriorposterior translation (Tz). The PosturePrintä system requires 13 reflective markers to be placed on the subject (mannequin) during photography and 16 additional ''click-on'' markers via computer mouse before a set of three photographs is analyzed by the PosturePrintä computer system over the Internet. Errors were the differences between the positioned mannequin and the calculated positions from the computer system. Average absolute value errors were obtained by comparing the exact inputted posture to the PosturePrintä's computed values. Mean and standard deviation of computational errors for sagittal displacements of the thoracic cage were Rx=0.3±0.1°, Tz=1.6±0.7 mm, and for frontal view displacements were Ry=1.2±1.0°, Rz=0.6±0.4°, and Tx=1.5±0.6 mm. The PosturePrintä system is sufficiently accurate in measuring thoracic cage postures in five degrees of freedom on a mannequin indicating the need for a further study on human subjects.

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Electromyography of muscles of posture: thigh muscles in males

Cited by 54 publications

References 5 publications

Effects of maximal oxygen uptake test and prolonged cycle ergometer exercise on the quiet standing control

Effects of maximal oxygen uptake test and prolonged cycle ergometer exercise on the quiet standing control

Postural muscle activity patterns during standing at rest and on an oscillating floor

Validation of a computer analysis to determine 3-D rotations and translations of the rib cage in upright posture from three 2-D digital images

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