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Jing Gao - One of the best experts on this subject based on the ideXlab platform.
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ultrasound strain imaging to assess the Biceps Brachii Muscle in chronic poststroke spasticity
Journal of Ultrasound in Medicine, 2018Co-Authors: Jing Gao, Jonathan M RubinAbstract:Objectives The aim of the study was to assess the feasibility of ultrasound strain imaging in characterizing the Biceps Brachii Muscle in chronic poststroke spasticity. Methods We prospectively analyzed strain imaging data from bilateral Biceps Brachii Muscles in 8 healthy volunteers and 7 patients with poststroke chronic spasticity. Axial deformations of the Biceps Brachii Muscle and overlying subcutaneous tissue were produced by external compression using a sandbag (1.0 kg) attached to a transducer. The lengthening and shortening of the Biceps Brachii Muscle and subcutaneous tissue were produced by manual passive elbow extension (from 90° to 0°) and flexion (from 0° to 90°), respectively. We used offline 2-dimensional speckle tracking to estimate axial and longitudinal strain ratios (Biceps Brachii strain/subcutaneous tissue strain), and the longitudinal tissue velocity of the Biceps Brachii Muscle. Statistical analyses included analysis of variance for testing differences in strain imaging parameters among healthy, nonspastic, and spastic Biceps Brachii Muscles, the Bonferroni correction for further testing differences in US strain imaging among paired groups (healthy versus spastic, nonspastic versus spastic, and healthy versus nonspastic), and the Pearson correlation coefficient for assessing the intraobserver reliability of performing strain imaging in stroke survivors. Results The differences in strain imaging parameters between healthy and spastic and between nonspastic and spastic Biceps Brachii Muscles were significant at both 90° elbow flexion and maximal elbow extension (P .05). The intraobserver reliability of performing strain imaging in stroke survivors was good (r = 0.85; P Conclusions Ultrasound strain imaging seems to be feasible for characterizing the Biceps Brachii Muscle in chronic poststroke spasticity.
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quantitative ultrasound imaging to assess the Biceps Brachii Muscle in chronic post stroke spasticity preliminary observation
Ultrasound in Medicine and Biology, 2018Co-Authors: Jing Gao, Johnson Chen, David Park, Michael Wells, Brian Fowlkes, Michael W OdellAbstract:We prospectively investigated the feasibility of using quantitative ultrasound imaging (QUI) to assess the Biceps Brachii Muscle (BBM) in individuals with chronic post-stroke spasticity. To quantify Muscle echogenicity and stiffness, we measured QUI parameters (gray-scale pixel value and shear wave velocity [SWV, m/s]) of the BBM in three groups: 16 healthy BBMs; 12 post-stroke, non-spastic BBMs; and 12 post-stroke, spastic BBMs. The QUI results were compared with the Modified Ashworth Scale and Tardieu Scale. A total of 20 SWVs were measured in each BBM, once at elbow in 90° flexion and again at maximally achievable extension using acoustic radiation force impulse imaging. BBM pixel value was measured in gray-scale images captured at 90° elbow flexion using ImageJ software. Statistical analyses included analysis of variance for examining the difference in SWV and pixel values among the three groups; Bonferroni correction for testing the difference in SWV and pixel values in a paired group; t-test for examining the difference in SWV values measured at two elbow angles; and Pearson correlation coefficient for analyzing the correlation of QUI to Modified Ashworth Scale and Tardieu Scale. SWV significantly differed between spastic BBMs and non-spastic or healthy BBMs. For pixel values, each of the three groups significantly differed from the others at elbow 90° flexion. The difference in SWV measured between the two elbow angles was also significant (p <0.01). A strong negative correlation was found between SWV and passive range of motion (R2 = -0.88, p <0.0001) in spastic upper limbs. These results suggest that the use of QUI is feasible in quantitative assessment of spastic BBM.
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ultrasound elastography in assessment of post stroke spasticity of the Biceps Brachii Muscle
Internaltional Ultrasonics Symposium, 2017Co-Authors: Jing Gao, Michael W Odell, Johnson ChenAbstract:Approximately 15 million people experience a stroke each year worldwide and two-thirds of these individuals require rehabilitation. Post-stroke spasticity is one of the common consequences characterized by excessive Muscle tone resulting in an increase of Muscle stiffness. To date, the assessment of spasticity is still a lack of gold standards. We prospectively evaluated the feasibility of ultrasound strain imaging (USI) to assess Biceps Brachii Muscle (BBM) stiffness and dynamic motion in subjects with post-stroke spasticity.
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ultrasound strain elastography in assessment of chronic post stroke spasticity of Biceps Brachii Muscle
Internaltional Ultrasonics Symposium, 2017Co-Authors: Jing Gao, Michael W Odell, Johnson Chen, Robert J MinAbstract:The assessment of post-stroke Muscle spasticity is challenging due to lack of a gold standard. The Modified Ashworth Scale (MAS), commonly used in evaluating spasticity is neither quantitative or reliable. We have reported the use of ultrasound strain imaging (USI) to assess rigid Biceps Brachii Muscle (BBM) in Parkinson's disease [1]. We have now extended the application of USI to determining spastic BBM in stroke survivors. We performed USI in 8 healthy volunteers and 8 subjects with chronic post-stroke spasticity of the upper limb. BBM axial deformation was produced by external compression using a sandbag (1.0 kg) tied transducer [2]. Lengthening and shortening of BBM was generated by manual passive elbow extension (from 90° to 0°) and flexion (from 0° to 90°), respectively. We used offline 2-D speckle tracking to estimate axial strain (representing BBM stiffness) as well as lateral strain and tissue velocity (representing BBM dynamic displacement). ANOVA was used to assess statistically significant differences in USI between healthy controls and both non-spastic and spastic BBMs in stroke survivors. The Bonferroni correction was then applied to test the difference in the paired groups (healthy vs non-spastic; non-spastic vs spastic; and healthy vs non-spastic). We observed significant differences in USI parameters between healthy and spastic BBM, and between non-spastic and spastic BBM (all p 1+).
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ultrasound shear wave elastography in the assessment of passive Biceps Brachii Muscle stiffness influences of sex and elbow position
Clinical Imaging, 2017Co-Authors: Johnson Chen, Michael W Odell, Jing GaoAbstract:Objective To assess differences in Biceps Brachii Muscle (BBM) stiffness as evaluated by ultrasound shear wave elastography (SWE). Methods The passive stiffness of the BBM was quantified with shear wave velocity (SWV) measurements obtained from 10 healthy volunteers (5 men and 5 women, mean age 50years, age range 42-63 years) with the elbow at full extension and 30° flexion in this IRB-approved study. Potential differences between two depths within the Muscle, two elbow positions, the two arms, and sexes were assessed by using two-tailed t-test. The reproducibility of SWV measurements was tested by using intraclass correlation coefficient (ICC). Results Significantly higher passive BBM stiffness was found at full elbow extension compared to 30° of flexion (p≤0.00006 for both arms). Significantly higher passive stiffness in women was seen for the right arm (p=0.04 for both elbow positions). Good correlation of shear wave velocity measured at the different depths. The ICC for interobserver and intraobserver variation was high. Conclusions SWE is a reliable quantitative tool for assessing BBM stiffness, with differences in stiffness based on elbow position demonstrated and based on sex suggested.
Kazunori Nosaka - One of the best experts on this subject based on the ideXlab platform.
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Optimum displacement of Muscle in relation to thickness for Biceps Brachii hardness measurement using a push-in meter
Biomedical Physics & Engineering Express, 2018Co-Authors: Mitsuyoshi Murayama, Takayuki Inami, Norihiro Shima, Kazunori Nosaka, Takanori Uchiyama, Tsugutake YonedaAbstract:Objective: Muscle hardness measured by a push-in meter is calculated from a force-displacement curve (FDC) based on a two-layer spring model. Since a FDC is not linear, how to set a linear range in the FDC largely affects Muscle hardness calculation. The present study investigated the linearity of the FDC to find the best portion relative to Muscle thickness (MT) for Muscle hardness measurement based on a two-layer spring model. Approach: Forty-seven men (age: 28 ± 10 years, height: 176 ± 7 cm, body mass: 73 ± 11 kg) participated in the present study. Hardness of the Biceps Brachii Muscle was measured at the mid-belly using a push-in meter. The FDC was obtained every 5% up to 50% of the MT, and linear regression equations of ten different portions within the FDC were calculated. The coefficient of determination (R2) of each regression line was compared by ANOVA, and a piecewise linear regression analysis was performed by dividing the identified FDC into three linear segments. Results: One-way ANOVA showed a significant (p < 0.01) main effect in R2 values of ten regression equations. Post-hoc analyses showed no significant differences in R2 between 0%–15% MT and 0%–40% MT. While the linearity of the FDC was high between 0%–15% and 0%–40% MT, the highest R2 value was found at 0%–25% and 0%–30% MT. According to the analysis of three linear segments in the FDC, the mean value of the point between the second and third segments was 28.5 ± 4.3% MT. Significance: These results suggested that Muscle hardness assessment using a push-in meter should be performed close to 30% MT depth for Biceps Brachii Muscle.
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measurement of Biceps Brachii Muscle cross sectional area by extended field of view ultrasound imaging technique merjenje precnega preseka misice Biceps Brachii s tehniko ultrazvocnega slikanja z razsirjenim vidnim poljem
2012Co-Authors: Roy Chan, Michael Newton, Kazunori NosakaAbstract:This study investigated the reliability of the extended-fieldof-view (EFOV) ultrasonography technique and its validity against magnetic resonance imaging (MRI) for Biceps Brachii Muscle cross-sectional area (CSA) assessment, and applied the method to examine changes in CSA following 10 sets of 3 maximal eccentric contractions of the elbow flexors. Bicep Brachii CSA was assessed using both EFOV and MRI techniques at the mid-point of the upper arm. A Pearson product moment analysis showed a high correlation (r = 0.99) between the EFOV and MRI measures; however, the CSA obtained from the EFOV (12.5 ± 6.3 cm 2 ) was smaller (P=0.004) than that of MRI (12.9 ± 6.1 cm 2 ). The reliability of the EFOV technique was assessed using the same scan image tracing twice (between-traces) and two images scanned from the same site (between-scans), and using the images taken from the same site one hour apart (between-measures). An Intra-class correlation (ICC) analysis showed good reliability (R=1.0) for both between-traces and between-scans, and coefficient of variation (CV) was less than 0.1 %. The reliability was also high for the measurements taken one hour apart (R=0.99, CV=0.7 %). These results show that EFOV is a valid and reliable method to assess Biceps Brachii CSA, but EFOV could give a smaller (~1 %) CSA than MRI. However, brachialis CSA was difficult to assess in this method, because of the limitation of the scanning technique. Biceps Brachii CSA was increased (P<0.05) immediately (8.7 ± 5.8 %) and 4 days (7.7 ± 6.0 %) following eccentric exercise of the elbow flexors, illustrating Muscle swelling.
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Biceps Brachii Muscle oxygenation in electrical Muscle stimulation
Clinical Physiology and Functional Imaging, 2010Co-Authors: Makii Muthalib, Marc Jubeau, Guillaume Y Millet, Nicola A Maffiuletti, Marco Ferrari, Kazunori NosakaAbstract:The purpose of this study was to compare between electrical Muscle stimulation (EMS) and maximal voluntary (VOL) isometric contractions of the elbow flexors for changes in Biceps Brachii Muscle oxygenation (tissue oxygenation index, TOI) and haemodynamics (total haemoglobin volume, tHb = oxygenated-Hb + deoxygenated-Hb) determined by near-infrared spectroscopy (NIRS). The Biceps Brachii Muscle of 10 healthy men (23-39 years) was electrically stimulated at high frequency (75 Hz) via surface electrodes to evoke 50 intermittent (4-s contraction, 15-s relaxation) isometric contractions at maximum tolerated current level (EMS session). The contralateral arm performed 50 intermittent (4-s contraction, 15-s relaxation) maximal voluntary isometric contractions (VOL session) in a counterbalanced order separated by 2-3 weeks. Results indicated that although the torque produced during EMS was approximately 50% of VOL (P<0.05), there was no significant difference in the changes in TOI amplitude or TOI slope between EMS and VOL over the 50 contractions. However, the TOI amplitude divided by peak torque was approximately 50% lower for EMS than VOL (P<0.05), which indicates EMS was less efficient than VOL. This seems likely because of the difference in the Muscles involved in the force production between conditions. Mean decrease in tHb amplitude during the contraction phases was significantly (P<0.05) greater for EMS than VOL from the 10th contraction onwards, suggesting that the Muscle blood volume was lower in EMS than VOL. It is concluded that local oxygen demand of the Biceps Brachii sampled by NIRS is similar between VOL and EMS.
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comparison between maximal lengthening and shortening contractions for Biceps Brachii Muscle oxygenation and hemodynamics
Journal of Applied Physiology, 2010Co-Authors: Guillaume Y Millet, Makii Muthalib, Marco Ferrari, Hoseong Lee, Kazunori NosakaAbstract:Eccentric contractions (ECC) require lower systemic oxygen (O2) and induce greater symptoms of Muscle damage than concentric contractions (CON); however, it is not known if local Muscle oxygenation...
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Biceps Brachii Muscle oxygenation in electrical Muscle stimulation
Faculty of Health; Institute of Health and Biomedical Innovation, 2010Co-Authors: Makii Muthalib, Marc Jubeau, Guillaume Y Millet, Nicola A Maffiuletti, Marco Ferrari, Kazunori NosakaAbstract:The purpose of this study was to compare between electrical Muscle stimulation (EMS) and maximal voluntary (VOL) isometric contractions of the elbow flexors for changes in Biceps Brachii Muscle oxygenation (tissue oxygenation index, TOI) and haemodynamics (total haemoglobin volume, tHb = oxygenated-Hb + deoxygenated-Hb) determined by near-infrared spectroscopy (NIRS). The Biceps Brachii Muscle of 10 healthy men (23–39 years) was electrically stimulated at high frequency (75 Hz) via surface electrodes to evoke 50 intermittent (4-s contraction, 15-s relaxation) isometric contractions at maximum tolerated current level (EMS session). The contralateral arm performed 50 intermittent (4-s contraction, 15-s relaxation) maximal voluntary isometric contractions (VOL session) in a counterbalanced order separated by 2–3 weeks. Results indicated that although the torque produced during EMS was approximately 50% of VOL (P<0AE05), there was no significant difference in the changes in TOI amplitude or TOI slope between EMS and VOL over the 50 contractions. However, the TOI amplitude divided by peak torque was approximately 50% lower for EMS than VOL (P<0AE05), which indicates EMS was less efficient than VOL. This seems likely because of the difference in the Muscles involved in the force production between conditions. Mean decrease in tHb amplitude during the contraction phases was significantly (P<0AE05) greater for EMS than VOL from the 10th contraction onwards, suggesting that the Muscle blood volume was lower in EMS than VOL. It is concluded that local oxygen demand of the Biceps Brachii sampled by NIRS is similar between VOL and EMS.
Guillaume Y Millet - One of the best experts on this subject based on the ideXlab platform.
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knee extensors neuromuscular fatigue changes the corticospinal pathway excitability in Biceps Brachii Muscle
Neuroscience, 2017Co-Authors: Guillaume Y Millet, Saied Jalal Aboodarda, Nemanja Sambaher, David G BehmAbstract:Abstract Equivocal evidence indicates that high-intensity Muscle contractions can affect the corticospinal responses in Muscles not directly involved in the task. In the present study, the responsiveness of corticomotor pathway innervating non-dominant Biceps Brachii was measured in eleven healthy participants before and after: (i) two 100-s isometric unilateral knee extension maximal voluntary contractions (MVCs) on dominant leg (FATIGUE) and (ii) rest (CONTROL). Transcranial magnetic stimulation, transmastoid electrical and brachial plexus electrical stimulation were used to evoke motor evoked potential (MEP), cervicomedullary motor evoked potential (CMEP) and compound Muscle action potential (Mmax) in Biceps Brachii Muscle. The three stimuli were elicited at 2, 3.5 and 5 s while participants were performing 6-s elbow flexion contractions at 100, 50, and 5% of MVC interspersed with 10-s rest. The results demonstrated opposing behaviors of MEP responses at 100% (23% higher, p = 0.08) and 5% MVC (34% lower, p = 0.019) following FATIGUE compared to CONTROL. Similarly, MEP·CMEP −1 ratio changes indicated that the supraspinal motor response was significantly higher during 100% (42%, p = 0.027) but lower during 5% MVC (28%, p = 0.009) following FATIGUE. Yet, the elbow flexor MVC force did not exhibit any difference between FATIGUE and CONTROL conditions. These results suggest that the upper limb Muscles’ corticomotor pathway responsiveness recorded during voluntary contractions were modulated by lower limbs fatiguing contractions and this modulation depends on the force produced during testing, i.e. level of central motor drive. However, these changes have little effect on upper limb Muscle maximal performance.
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Biceps Brachii Muscle oxygenation in electrical Muscle stimulation
Clinical Physiology and Functional Imaging, 2010Co-Authors: Makii Muthalib, Marc Jubeau, Guillaume Y Millet, Nicola A Maffiuletti, Marco Ferrari, Kazunori NosakaAbstract:The purpose of this study was to compare between electrical Muscle stimulation (EMS) and maximal voluntary (VOL) isometric contractions of the elbow flexors for changes in Biceps Brachii Muscle oxygenation (tissue oxygenation index, TOI) and haemodynamics (total haemoglobin volume, tHb = oxygenated-Hb + deoxygenated-Hb) determined by near-infrared spectroscopy (NIRS). The Biceps Brachii Muscle of 10 healthy men (23-39 years) was electrically stimulated at high frequency (75 Hz) via surface electrodes to evoke 50 intermittent (4-s contraction, 15-s relaxation) isometric contractions at maximum tolerated current level (EMS session). The contralateral arm performed 50 intermittent (4-s contraction, 15-s relaxation) maximal voluntary isometric contractions (VOL session) in a counterbalanced order separated by 2-3 weeks. Results indicated that although the torque produced during EMS was approximately 50% of VOL (P<0.05), there was no significant difference in the changes in TOI amplitude or TOI slope between EMS and VOL over the 50 contractions. However, the TOI amplitude divided by peak torque was approximately 50% lower for EMS than VOL (P<0.05), which indicates EMS was less efficient than VOL. This seems likely because of the difference in the Muscles involved in the force production between conditions. Mean decrease in tHb amplitude during the contraction phases was significantly (P<0.05) greater for EMS than VOL from the 10th contraction onwards, suggesting that the Muscle blood volume was lower in EMS than VOL. It is concluded that local oxygen demand of the Biceps Brachii sampled by NIRS is similar between VOL and EMS.
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comparison between maximal lengthening and shortening contractions for Biceps Brachii Muscle oxygenation and hemodynamics
Journal of Applied Physiology, 2010Co-Authors: Guillaume Y Millet, Makii Muthalib, Marco Ferrari, Hoseong Lee, Kazunori NosakaAbstract:Eccentric contractions (ECC) require lower systemic oxygen (O2) and induce greater symptoms of Muscle damage than concentric contractions (CON); however, it is not known if local Muscle oxygenation...
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Biceps Brachii Muscle oxygenation in electrical Muscle stimulation
Faculty of Health; Institute of Health and Biomedical Innovation, 2010Co-Authors: Makii Muthalib, Marc Jubeau, Guillaume Y Millet, Nicola A Maffiuletti, Marco Ferrari, Kazunori NosakaAbstract:The purpose of this study was to compare between electrical Muscle stimulation (EMS) and maximal voluntary (VOL) isometric contractions of the elbow flexors for changes in Biceps Brachii Muscle oxygenation (tissue oxygenation index, TOI) and haemodynamics (total haemoglobin volume, tHb = oxygenated-Hb + deoxygenated-Hb) determined by near-infrared spectroscopy (NIRS). The Biceps Brachii Muscle of 10 healthy men (23–39 years) was electrically stimulated at high frequency (75 Hz) via surface electrodes to evoke 50 intermittent (4-s contraction, 15-s relaxation) isometric contractions at maximum tolerated current level (EMS session). The contralateral arm performed 50 intermittent (4-s contraction, 15-s relaxation) maximal voluntary isometric contractions (VOL session) in a counterbalanced order separated by 2–3 weeks. Results indicated that although the torque produced during EMS was approximately 50% of VOL (P<0AE05), there was no significant difference in the changes in TOI amplitude or TOI slope between EMS and VOL over the 50 contractions. However, the TOI amplitude divided by peak torque was approximately 50% lower for EMS than VOL (P<0AE05), which indicates EMS was less efficient than VOL. This seems likely because of the difference in the Muscles involved in the force production between conditions. Mean decrease in tHb amplitude during the contraction phases was significantly (P<0AE05) greater for EMS than VOL from the 10th contraction onwards, suggesting that the Muscle blood volume was lower in EMS than VOL. It is concluded that local oxygen demand of the Biceps Brachii sampled by NIRS is similar between VOL and EMS.
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comparison between maximal lengthening and shortening contractions for Biceps Brachii Muscle oxygenation and hemodynamics
Faculty of Health; Institute of Health and Biomedical Innovation, 2010Co-Authors: Guillaume Y Millet, Makii Muthalib, Marco Ferrari, Hoseong Lee, Kazunori NosakaAbstract:Eccentric contractions (ECC) require lower systemic oxygen (O2) and induce greater symptoms of Muscle damage than concentric contractions (CON); however, it is not known if local Muscle oxygenation is lower in ECC than CON during and following exercise. This study compared between ECC and CON for changes in Biceps Brachii Muscle oxygenation [tissue oxygenation index (TOI)] and hemodynamics [total hemoglobin volume (tHb) = oxygenated-Hb + deoxygenated-Hb], determined by near-infrared spectroscopy over 10 sets of 6 maximal contractions of the elbow flexors of 10 healthy subjects. This study also compared between ECC and CON for changes in TOI and tHb during a 10-s sustained and 30-repeated maximal isometric contraction (MVC) task measured immediately before and after and 1–3 days following exercise. The torque integral during ECC was greater (P < 0.05) than that during CON by ∼30%, and the decrease in TOI was smaller (P < 0.05) by ∼50% during ECC than CON. Increases in tHb during the relaxation phases were smaller (P < 0.05) by ∼100% for ECC than CON; however, the decreases in tHb during the contraction phases were not significantly different between sessions. These results suggest that ECC utilizes a lower Muscle O2 relative to O2 supply compared with CON. Following exercise, greater (P < 0.05) decreases in MVC strength and increases in plasma creatine kinase activity and Muscle soreness were evident 1–3 days after ECC than CON. Torque integral, TOI, and tHb during the sustained and repeated MVC tasks decreased (P < 0.01) only after ECC, suggesting that Muscle O2 demand relative to O2 supply during the isometric tasks was decreased after ECC. This could mainly be due to a lower maximal Muscle mass activated as a consequence of Muscle damage; however, an increase in O2 supply due to microcirculation dysfunction and/or inflammatory vasodilatory responses after ECC is recognized.
Makii Muthalib - One of the best experts on this subject based on the ideXlab platform.
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Biceps Brachii Muscle oxygenation in electrical Muscle stimulation
Clinical Physiology and Functional Imaging, 2010Co-Authors: Makii Muthalib, Marc Jubeau, Guillaume Y Millet, Nicola A Maffiuletti, Marco Ferrari, Kazunori NosakaAbstract:The purpose of this study was to compare between electrical Muscle stimulation (EMS) and maximal voluntary (VOL) isometric contractions of the elbow flexors for changes in Biceps Brachii Muscle oxygenation (tissue oxygenation index, TOI) and haemodynamics (total haemoglobin volume, tHb = oxygenated-Hb + deoxygenated-Hb) determined by near-infrared spectroscopy (NIRS). The Biceps Brachii Muscle of 10 healthy men (23-39 years) was electrically stimulated at high frequency (75 Hz) via surface electrodes to evoke 50 intermittent (4-s contraction, 15-s relaxation) isometric contractions at maximum tolerated current level (EMS session). The contralateral arm performed 50 intermittent (4-s contraction, 15-s relaxation) maximal voluntary isometric contractions (VOL session) in a counterbalanced order separated by 2-3 weeks. Results indicated that although the torque produced during EMS was approximately 50% of VOL (P<0.05), there was no significant difference in the changes in TOI amplitude or TOI slope between EMS and VOL over the 50 contractions. However, the TOI amplitude divided by peak torque was approximately 50% lower for EMS than VOL (P<0.05), which indicates EMS was less efficient than VOL. This seems likely because of the difference in the Muscles involved in the force production between conditions. Mean decrease in tHb amplitude during the contraction phases was significantly (P<0.05) greater for EMS than VOL from the 10th contraction onwards, suggesting that the Muscle blood volume was lower in EMS than VOL. It is concluded that local oxygen demand of the Biceps Brachii sampled by NIRS is similar between VOL and EMS.
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comparison between maximal lengthening and shortening contractions for Biceps Brachii Muscle oxygenation and hemodynamics
Journal of Applied Physiology, 2010Co-Authors: Guillaume Y Millet, Makii Muthalib, Marco Ferrari, Hoseong Lee, Kazunori NosakaAbstract:Eccentric contractions (ECC) require lower systemic oxygen (O2) and induce greater symptoms of Muscle damage than concentric contractions (CON); however, it is not known if local Muscle oxygenation...
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Biceps Brachii Muscle oxygenation in electrical Muscle stimulation
Faculty of Health; Institute of Health and Biomedical Innovation, 2010Co-Authors: Makii Muthalib, Marc Jubeau, Guillaume Y Millet, Nicola A Maffiuletti, Marco Ferrari, Kazunori NosakaAbstract:The purpose of this study was to compare between electrical Muscle stimulation (EMS) and maximal voluntary (VOL) isometric contractions of the elbow flexors for changes in Biceps Brachii Muscle oxygenation (tissue oxygenation index, TOI) and haemodynamics (total haemoglobin volume, tHb = oxygenated-Hb + deoxygenated-Hb) determined by near-infrared spectroscopy (NIRS). The Biceps Brachii Muscle of 10 healthy men (23–39 years) was electrically stimulated at high frequency (75 Hz) via surface electrodes to evoke 50 intermittent (4-s contraction, 15-s relaxation) isometric contractions at maximum tolerated current level (EMS session). The contralateral arm performed 50 intermittent (4-s contraction, 15-s relaxation) maximal voluntary isometric contractions (VOL session) in a counterbalanced order separated by 2–3 weeks. Results indicated that although the torque produced during EMS was approximately 50% of VOL (P<0AE05), there was no significant difference in the changes in TOI amplitude or TOI slope between EMS and VOL over the 50 contractions. However, the TOI amplitude divided by peak torque was approximately 50% lower for EMS than VOL (P<0AE05), which indicates EMS was less efficient than VOL. This seems likely because of the difference in the Muscles involved in the force production between conditions. Mean decrease in tHb amplitude during the contraction phases was significantly (P<0AE05) greater for EMS than VOL from the 10th contraction onwards, suggesting that the Muscle blood volume was lower in EMS than VOL. It is concluded that local oxygen demand of the Biceps Brachii sampled by NIRS is similar between VOL and EMS.
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comparison between maximal lengthening and shortening contractions for Biceps Brachii Muscle oxygenation and hemodynamics
Faculty of Health; Institute of Health and Biomedical Innovation, 2010Co-Authors: Guillaume Y Millet, Makii Muthalib, Marco Ferrari, Hoseong Lee, Kazunori NosakaAbstract:Eccentric contractions (ECC) require lower systemic oxygen (O2) and induce greater symptoms of Muscle damage than concentric contractions (CON); however, it is not known if local Muscle oxygenation is lower in ECC than CON during and following exercise. This study compared between ECC and CON for changes in Biceps Brachii Muscle oxygenation [tissue oxygenation index (TOI)] and hemodynamics [total hemoglobin volume (tHb) = oxygenated-Hb + deoxygenated-Hb], determined by near-infrared spectroscopy over 10 sets of 6 maximal contractions of the elbow flexors of 10 healthy subjects. This study also compared between ECC and CON for changes in TOI and tHb during a 10-s sustained and 30-repeated maximal isometric contraction (MVC) task measured immediately before and after and 1–3 days following exercise. The torque integral during ECC was greater (P < 0.05) than that during CON by ∼30%, and the decrease in TOI was smaller (P < 0.05) by ∼50% during ECC than CON. Increases in tHb during the relaxation phases were smaller (P < 0.05) by ∼100% for ECC than CON; however, the decreases in tHb during the contraction phases were not significantly different between sessions. These results suggest that ECC utilizes a lower Muscle O2 relative to O2 supply compared with CON. Following exercise, greater (P < 0.05) decreases in MVC strength and increases in plasma creatine kinase activity and Muscle soreness were evident 1–3 days after ECC than CON. Torque integral, TOI, and tHb during the sustained and repeated MVC tasks decreased (P < 0.01) only after ECC, suggesting that Muscle O2 demand relative to O2 supply during the isometric tasks was decreased after ECC. This could mainly be due to a lower maximal Muscle mass activated as a consequence of Muscle damage; however, an increase in O2 supply due to microcirculation dysfunction and/or inflammatory vasodilatory responses after ECC is recognized.
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comparison between electrically evoked and voluntary isometric contractions for Biceps Brachii Muscle oxidative metabolism using near infrared spectroscopy
European Journal of Applied Physiology, 2009Co-Authors: Makii Muthalib, Marc Jubeau, Guillaume Y Millet, Nicola A Maffiuletti, Kazunori NosakaAbstract:This study compared voluntary (VOL) and electrically evoked isometric contractions by Muscle stimulation (EMS) for changes in Biceps Brachii Muscle oxygenation (tissue oxygenation index, ∆TOI) and total haemoglobin concentration (∆tHb = oxygenated haemoglobin + deoxygenated haemoglobin) determined by near-infrared spectroscopy. Twelve men performed EMS with one arm followed 24 h later by VOL with the contralateral arm, consisting of 30 repeated (1-s contraction, 1-s relaxation) isometric contractions at 30% of maximal voluntary contraction (MVC) for the first 60 s, and maximal intensity contractions thereafter (MVC for VOL and maximal tolerable current at 30 Hz for EMS) until MVC decreased ~30% of pre-exercise MVC. During the 30 contractions at 30% MVC, ∆TOI decrease was significantly (P < 0.05) greater and ∆tHb was significantly (P < 0.05) lower for EMS than VOL, suggesting that the metabolic demand for oxygen in EMS is greater than VOL at the same torque level. However, during maximal intensity contractions, although EMS torque (~40% of VOL) was significantly (P < 0.05) lower than VOL, ∆TOI was similar and ∆tHb was significantly (P < 0.05) lower for EMS than VOL towards the end, without significant differences between the two sessions in the recovery period. It is concluded that the oxygen demand of the activated Biceps Brachii Muscle in EMS is comparable to VOL at maximal intensity.
Donald Resnick - One of the best experts on this subject based on the ideXlab platform.
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accessory head of Biceps Brachii Muscle anatomy histology and mri in cadavers
American Journal of Roentgenology, 2010Co-Authors: Ramon Gheno, Cristiane S Zoner, Florian M Buck, Marcelo A C Nico, Parviz Haghighi, Debra Trudell, Donald ResnickAbstract:OBJECTIVE: The purpose of our study is to describe and define an anatomic variation located close to the bicipital groove using MRI with gross anatomic and histologic correlation in cadavers. MATERIALS AND METHODS: Ten fresh male human shoulders were harvested and used in this investigation. They were derived from persons with a mean age of death of 78.9 years (age range, 58-92 years). MR arthrography using proton density-weighted sequences was used to obtain images in axial, coronal, and sagittal planes. After imaging, the specimens were cut in axial, coronal, and sagittal sections using a band saw. The slices were then photographed to allow correlation with the MR arthrographic images, followed by histologic analysis. RESULTS: Two anomalous tendons, both intimate with the tendon of the long head of the Biceps Brachii Muscle in the bicipital groove, were recognized. The origin of both tendons was in the greater tuberosity near the articular capsule. These structures had a muscular belly that was joined with the other Biceps bellies. At the level of the bicipital groove, the anomalous tendons appeared as hypointense structures in proton density-weighted images, with a mostly flat morphology in axial and coronal planes. The average dimensions of these structures were 45.5 (craniocaudal)x6.2 (anteroposterior)x0.85 (mediolateral) mm. CONCLUSION: The MR images, gross anatomic inspection, and histologic information led us to conclude that these anomalous structures were accessory heads of the Biceps Brachii Muscle.
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accessory head of Biceps Brachii Muscle anatomy histology and mri in cadavers
American Journal of Roentgenology, 2010Co-Authors: Ramon Gheno, Cristiane S Zoner, Florian M Buck, Marcelo A C Nico, Parviz Haghighi, Debra Trudell, Donald ResnickAbstract:OBJECTIVE. The purpose of our study is to describe and define an anatomic variation located close to the bicipital groove using MRI with gross anatomic and histologic correlation in cadavers.MATERIALS AND METHODS. Ten fresh male human shoulders were harvested and used in this investigation. They were derived from persons with a mean age of death of 78.9 years (age range, 58–92 years). MR arthrography using proton density–weighted sequences was used to obtain images in axial, coronal, and sagittal planes. After imaging, the specimens were cut in axial, coronal, and sagittal sections using a band saw. The slices were then photographed to allow correlation with the MR arthrographic images, followed by histologic analysis.RESULTS. Two anomalous tendons, both intimate with the tendon of the long head of the Biceps Brachii Muscle in the bicipital groove, were recognized. The origin of both tendons was in the greater tuberosity near the articular capsule. These structures had a muscular belly that was joined wit...