The Experts below are selected from a list of 4062 Experts worldwide ranked by ideXlab platform

Yagesh Bhambhani - One of the best experts on this subject based on the ideXlab platform.

  • microvascularity of the lumbar Erector Spinae Muscle during sustained prone trunk extension test
    Advances in Experimental Medicine and Biology, 2009
    Co-Authors: Rammohan V Maikala, Yagesh Bhambhani
    Abstract:

    This study evaluated the reliability of oxygenation and blood volume responses, from the right Erector Spinae in twenty two healthy men and women, during static prone trunk extension on two separate days. Near-infrared spectroscopy (NIRS)- derived physiological changefor oxygenation was calculated as the difference between the ‘baseline’ before the start of the trunk extension and ‘minimum’ at the point of volitional exhaustion. The physiological changefor blood volume was calculated as the difference between the ‘baseline’ value and ‘maximum’ at the point of volitional exhaustion. Test-retest reliability, based on the intraclass correlation coefficients for the physiological changewere: oxygenation - men: +0.60 versus women: +0.37; blood volume - men: +0.93 versus women: +0.59, respectively. Results suggest that NIRSderived blood volume measurements were more reliable than the oxygenation responses. The most interesting observation of the study was the hyperemia in blood volume responses with a parallel decrease in oxygenation as participants continued the test until volitional exhaustion. Such an increase in Muscle blood volume contradicts the theory that sufficient occlusion of blood flow to the lumbar Muscle region is possible with static trunk extension resulting in Muscle fatigue.

  • relationship between Erector Spinae Muscle oxygenation via in vivo near infrared spectroscopy and static endurance time in healthy males
    European Journal of Applied Physiology, 2007
    Co-Authors: Robert T. Kell, Yagesh Bhambhani
    Abstract:

    The purpose of the study was to confirm the trends in right and left side Muscle blood volume (Mbv) and Muscle oxygenation (Mox) during the Biering-Sorensen muscular endurance (BSME) test, compare right and left side Mbv and Mox responses, and predict BSME time via Mox variables. Research suggests that during moderate intensity (approximately 20% of maximal volitional contraction) Muscle contraction blood flow will decrease as a result of increased intramuscular pressure. Moreover, decreased Muscle oxygenation is believed to be associated with diminished musculoskeletal endurance time, but until the development of near infrared spectroscopy (NIRS) it was not possible to non-invasively monitor these changes in Erector Spinae Muscle. Nineteen healthy males completed the BSME in a prone position. The NIRS probes were placed on the left and right Erector Spinae Muscle at the third lumbar vertebra level. The test protocol was: 2 min resting baseline, BSME to volitional fatigue, and 4 min recovery. The results indicated Mbv initially increased reaching asymptote before returning to baseline at termination. The Mox increased then declined systematically until BSME termination, returning to near baseline in recovery. No significant difference between sides was noted for Mbv or Mox. Mox best predicted BSME time. In conclusion, Mbv increased and then reaches asymptote as indicated in previous research, and oxygen availability was associated with the duration of Erector Spinae static contraction. Thus, prolonged static postures using the Erector Spinae Muscles may diminish Muscle oxygenation increasing susceptible to fatigue and injury.

  • In vivo Erector Spinae Muscle blood volume and oxygenation measures during repetitive incremental lifting and lowering in chronic low back pain participants.
    Spine, 2006
    Co-Authors: Robert T. Kell, Yagesh Bhambhani
    Abstract:

    Study Design. A case control study. Objectives. Using metabolic gas analysis and near infrared spectroscopy, a comparison was made between healthy controls and chronic low back pain (LBP) participants on cardiorespiratory, Erector Spinae Muscle blood volume, and oxygenation responses, and these variables were used to determine factors that best predict peak oxygen consumption (VO 2peak ). of Background Data. To date, it is unknown how the cardiorespiratory and Erector Spinae Muscles of chronic LBP persons respond to repetitive incremental lifting and lowering. With the advent of near infrared spectroscopy technology, it is now possible to noninvasively examine Erector Spinae Muscle oxygen supply and utilization in vivo. Thus, by using metabolic gas analysis and near infrared spectroscopy technology simultaneously, it is now possible to compare the cardiorespiratory and Erector Spinae Muscle responses of chronic LBP participants to that of healthy controls (no history of LBP) during incremental work to volitional fatigue. Methods. Thirty-four participants with chronic LBP and 34 healthy controls completed the repetitive incremental lifting and lowering (2.28 kg ·min -1 ) protocol from floor to table (height 76 cm) at 10 lifts ·min -1 to voluntary fatigue. Results. The healthy controls had significantly greater VO 2peak (mL·kg -1 ·min -1 ) and VOapeak (mL ·kg LBM -1 · min -1 ), peak mass lifted, test duration, and breathing frequency. Furthermore, healthy controls showed significantly greater change in Muscle oxygenation and faster one-half recovery times. Multiple regression analysis indicated that approximately 97% of the variance in absolute VO 2peak was predicted by cardiorespiratory variables in both groups, while Muscle oxygenation aided in predicting VO 2peak relative in the LBP participants. Conclusions. The results indicated that the chronic LBP participants demonstrated a reduced cardiorespiratory and Erector Spinae Muscle response during repetitive incremental lifting and lowering to volitional fatigue as compared to the healthy controls.

  • Relationship between Erector Spinae static endurance and Muscle oxygenation-blood volume changes in healthy and low back pain subjects
    European Journal of Applied Physiology, 2006
    Co-Authors: Robert T. Kell, Yagesh Bhambhani
    Abstract:

    The purposes of this study were to: (1) compare the Muscle blood volume (Mbv) and oxygenation (Mox) responses on the right and left side Erector Spinae during the Biering-Sorensen Muscle endurance (BSME) test between healthy, low back pain active (LBP-A) and LBP-sedentary (LBP-S) subjects using near infrared spectroscopy (NIRS), and (2) determine the relationships between the BSME time and Mbv and Mox. Informed consent was obtained from 30 healthy and 30 chronic LBP subjects. The latter group was subdivided into an active (LBP-A; n =18) and sedentary (LBP-S; n =12) subgroups based on physical activity patterns. The groups were age and sex matched. The NIRS probes were placed bilaterally on the Erector Spinae Muscle at the level of the third lumbar vertebrae. The testing protocol was: 2-min resting baseline, BSME to voluntary fatigue, and 4-min recovery. During the BSME Mbv immediately increased for ~30–60 s, then showed an asymptote, and a steady decline towards the baseline at termination. Mox demonstrated either an initial increase followed by a systematic decrease until the termination of the BSME, or a systematic decrease throughout the BSME until termination. The LBP-S subjects showed a reduced Mox-range and slower Mox ½ recovery time on the left side suggesting a reduced aerobic capacity of the Erector Spinae Muscle in this group. Significant correlations were noted between BSME time and the pooled values of Mox-delta and-range only in the LBP-A group. These observations suggest that factors other than Erector Spinae aerobic capacity can influence BSME performance.

Noriaki Ichihashi - One of the best experts on this subject based on the ideXlab platform.

  • effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and multifidus Muscles an ultrasonic shear wave elastography study
    European Journal of Applied Physiology, 2019
    Co-Authors: Mitsuhiro Masaki, Taishi Yamauchi, Hiroshige Tateuchi, Noriaki Ichihashi
    Abstract:

    Purpose The present study aimed to clarify the effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and lumbar multifidus Muscles using ultrasonic shear wave elastography (SWE). Methods The study included ten healthy men. The shear elastic modulus of the left lumbar Erector Spinae and lumbar multifidus Muscles were evaluated using ultrasonic SWE. Measurement postures for the left lumbar Erector Spinae Muscle were (1) prone position (Rest), (2) sitting position with the trunk flexed (Flexion), (3) the Flexion position adding right trunk lateral flexion (Flexion-Lateral Flexion), and (4) the Flexion position adding right trunk rotation (Flexion-Rotation 1). The left lumbar multifidus Muscle were measured in positions (1)-(3), and (5) the Flexion position adding left trunk rotation (Flexion-Rotation 2). Results The shear elastic modulus of the lumbar Erector Spinae Muscle in the Flexion-Lateral Flexion position was significantly higher than that in the Rest, Flexion, or Flexion-Rotation 1 positions. Shear elastic modulus of the lumbar multifidus Muscle was similar in the Flexion, Flexion-Lateral Flexion, and Flexion-Rotation 2 positions, but significantly lower in the Rest position. Conclusions The results of the present study suggest that the lumbar Erector Spinae Muscle is stretched effectively in the position adding trunk contralateral lateral flexion to flexion. The results also indicate that the lumbar multifidus Muscle, which does not appear to be affected by adding trunk contralateral lateral flexion or ipsilateral rotation to flexion, is stretched effectively in the trunk flexion position.

  • effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and multifidus Muscles an ultrasonic shear wave elastography study
    European Journal of Applied Physiology, 2019
    Co-Authors: Mitsuhiro Masaki, Taishi Yamauchi, Hiroshige Tateuchi, Noriaki Ichihashi
    Abstract:

    The present study aimed to clarify the effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and lumbar multifidus Muscles using ultrasonic shear wave elastography (SWE). The study included ten healthy men. The shear elastic modulus of the left lumbar Erector Spinae and lumbar multifidus Muscles were evaluated using ultrasonic SWE. Measurement postures for the left lumbar Erector Spinae Muscle were (1) prone position (Rest), (2) sitting position with the trunk flexed (Flexion), (3) the Flexion position adding right trunk lateral flexion (Flexion-Lateral Flexion), and (4) the Flexion position adding right trunk rotation (Flexion-Rotation 1). The left lumbar multifidus Muscle were measured in positions (1)–(3), and (5) the Flexion position adding left trunk rotation (Flexion-Rotation 2). The shear elastic modulus of the lumbar Erector Spinae Muscle in the Flexion-Lateral Flexion position was significantly higher than that in the Rest, Flexion, or Flexion-Rotation 1 positions. Shear elastic modulus of the lumbar multifidus Muscle was similar in the Flexion, Flexion-Lateral Flexion, and Flexion-Rotation 2 positions, but significantly lower in the Rest position. The results of the present study suggest that the lumbar Erector Spinae Muscle is stretched effectively in the position adding trunk contralateral lateral flexion to flexion. The results also indicate that the lumbar multifidus Muscle, which does not appear to be affected by adding trunk contralateral lateral flexion or ipsilateral rotation to flexion, is stretched effectively in the trunk flexion position.

Mitsuhiro Masaki - One of the best experts on this subject based on the ideXlab platform.

  • effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and multifidus Muscles an ultrasonic shear wave elastography study
    European Journal of Applied Physiology, 2019
    Co-Authors: Mitsuhiro Masaki, Taishi Yamauchi, Hiroshige Tateuchi, Noriaki Ichihashi
    Abstract:

    Purpose The present study aimed to clarify the effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and lumbar multifidus Muscles using ultrasonic shear wave elastography (SWE). Methods The study included ten healthy men. The shear elastic modulus of the left lumbar Erector Spinae and lumbar multifidus Muscles were evaluated using ultrasonic SWE. Measurement postures for the left lumbar Erector Spinae Muscle were (1) prone position (Rest), (2) sitting position with the trunk flexed (Flexion), (3) the Flexion position adding right trunk lateral flexion (Flexion-Lateral Flexion), and (4) the Flexion position adding right trunk rotation (Flexion-Rotation 1). The left lumbar multifidus Muscle were measured in positions (1)-(3), and (5) the Flexion position adding left trunk rotation (Flexion-Rotation 2). Results The shear elastic modulus of the lumbar Erector Spinae Muscle in the Flexion-Lateral Flexion position was significantly higher than that in the Rest, Flexion, or Flexion-Rotation 1 positions. Shear elastic modulus of the lumbar multifidus Muscle was similar in the Flexion, Flexion-Lateral Flexion, and Flexion-Rotation 2 positions, but significantly lower in the Rest position. Conclusions The results of the present study suggest that the lumbar Erector Spinae Muscle is stretched effectively in the position adding trunk contralateral lateral flexion to flexion. The results also indicate that the lumbar multifidus Muscle, which does not appear to be affected by adding trunk contralateral lateral flexion or ipsilateral rotation to flexion, is stretched effectively in the trunk flexion position.

  • effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and multifidus Muscles an ultrasonic shear wave elastography study
    European Journal of Applied Physiology, 2019
    Co-Authors: Mitsuhiro Masaki, Taishi Yamauchi, Hiroshige Tateuchi, Noriaki Ichihashi
    Abstract:

    The present study aimed to clarify the effects of the trunk position on Muscle stiffness that reflects elongation of the lumbar Erector Spinae and lumbar multifidus Muscles using ultrasonic shear wave elastography (SWE). The study included ten healthy men. The shear elastic modulus of the left lumbar Erector Spinae and lumbar multifidus Muscles were evaluated using ultrasonic SWE. Measurement postures for the left lumbar Erector Spinae Muscle were (1) prone position (Rest), (2) sitting position with the trunk flexed (Flexion), (3) the Flexion position adding right trunk lateral flexion (Flexion-Lateral Flexion), and (4) the Flexion position adding right trunk rotation (Flexion-Rotation 1). The left lumbar multifidus Muscle were measured in positions (1)–(3), and (5) the Flexion position adding left trunk rotation (Flexion-Rotation 2). The shear elastic modulus of the lumbar Erector Spinae Muscle in the Flexion-Lateral Flexion position was significantly higher than that in the Rest, Flexion, or Flexion-Rotation 1 positions. Shear elastic modulus of the lumbar multifidus Muscle was similar in the Flexion, Flexion-Lateral Flexion, and Flexion-Rotation 2 positions, but significantly lower in the Rest position. The results of the present study suggest that the lumbar Erector Spinae Muscle is stretched effectively in the position adding trunk contralateral lateral flexion to flexion. The results also indicate that the lumbar multifidus Muscle, which does not appear to be affected by adding trunk contralateral lateral flexion or ipsilateral rotation to flexion, is stretched effectively in the trunk flexion position.

Shuichi Matsuda - One of the best experts on this subject based on the ideXlab platform.

  • late breaking abstract prognostic impact of decreased Erector Spinae Muscle radiographic density after lung transplantation
    European Respiratory Journal, 2021
    Co-Authors: Yohei Oshima, Susumu Sato, Toyofumi F Chenyoshikawa, Daisuke Nakajima, Manabu Nankaku, Hiroshi Date, Yuji Yoshioka, Ryota Hamada, Ayumi Otagaki, Shuichi Matsuda
    Abstract:

    Introduction: A radiographic density of Erector Spinae Muscles (ESMs) is often decreased after lung transplantation (LTx) (Oshima Y, et al. ERJ Open Res. 2020). However, a prognostic impact of this change is not elucidated. Objective: To verify whether the decrease in the radiographic density of ESMs after LTx can be associated with a poor prognosis. Methods: Routine follow-up chest computed tomography scan data just before and 12 weeks after LTx were retrospectively retrieved for adult patients who underwent primary LTx at Kyoto University Hospital. The radiographic density of ESMs was quantitatively evaluated as the mean attenuation of the ESMs (ESMct), and an impact of the decreased ESMct during 12 weeks after LTx on overall survival (OS) was examined by Cox proportional hazard analyses. Results: A total of 165 recipients (105 deceased-donor, 59 living-donor, 1 deceased- and living-donor-mixed LTx) were included in this study. Median duration of postoperative observation was 3.2 years, and 37 recipients (22%) had died in this period. Postoperative decreased ESMct was significantly associated with poor OS (per 5 HU decrease; HR, 1.49; 95% CI, 1.16-1.92, p=0.002) by multivariate model adjusted for age, sex, preoperative steroid use, episodes of acute rejection, and preoperative ESMct. Furthermore, the similar results were obtained when the subjects were limited to the deceased donor LTx. Conclusion: Postoperative decreased ESMct was closely associated with a poor prognosis after LTx. These results suggests that to maintain the postoperative Muscle radiographic density, which reflects Muscle quality, may be important for the better prognosis after LTx.

  • Erector Spinae Muscle radiographic density is associated with survival after lung transplantation
    The Journal of Thoracic and Cardiovascular Surgery, 2021
    Co-Authors: Yohei Oshima, Susumu Sato, Toyofumi F Chenyoshikawa, Daisuke Nakajima, Manabu Nankaku, Hiroshi Date, Shuichi Matsuda
    Abstract:

    Abstract Objective The study objective was to verify whether low preoperative radiographic density of Erector Spinae Muscles is associated with poor prognosis after lung transplantation. Methods Preoperative chest computed tomography scans for patients who underwent deceased-donor lung transplantation between 2013 and 2019 at Kyoto University Hospital were retrospectively retrieved. The radiographic density of Erector Spinae Muscles was quantitatively evaluated as the mean attenuation of Erector Spinae Muscles, and low mean radiographic density of the Erector Spinae Muscles was defined as a mean radiographic density of the Erector Spinae Muscles value below the median value for all patients. Overall survival and chronic lung allograft dysfunction-free survival with high and low mean radiographic density of the Erector Spinae Muscles were estimated using the Kaplan–Meier method and evaluated by the log-rank test, as well as by univariate and multivariate Cox proportional hazard analyses. Results Of the 107 adult patients who underwent primary transplantation, 96 underwent at least 1 chest computed tomography scan within 24 hours before lung transplantation. The median mean radiographic density of the Erector Spinae Muscles in these 96 patients was 49.2 Hounsfield units. A low mean radiographic density of the Erector Spinae Muscles value was significantly associated with decreased overall survival (hazard ratio, 4.50; P = .030) and chronic lung allograft dysfunction–free survival (hazard ratio, 3.18; P = .028) in the multivariate analysis. Additionally, patients with preoperative steroid use and a low mean radiographic density of the Erector Spinae Muscles value had a worse overall survival (P  Conclusions Low mean radiographic density of the Erector Spinae Muscles was closely associated with a poor prognosis after lung transplantation. The prognosis was particularly poor in patients with preoperative steroid use and a low mean radiographic density of the Erector Spinae Muscles. These results may be useful when considering the indications for lung transplantation or preoperative interventions. Video Abstract Download : Download video (16MB)

Huub M. Toussaint - One of the best experts on this subject based on the ideXlab platform.

  • The influence of torque and velocity on Erector Spinae Muscle fatigue and its relationship to changes of electromyogram spectrum density
    European Journal of Applied Physiology, 1996
    Co-Authors: J.h. Van Dieen, B. Böke, W. Oosterhuis, Huub M. Toussaint
    Abstract:

    The influence of contraction force and velocity during isokinetic contractions on the development of fatigue in the Erector Spinae Muscle was studied. Seven male subjects performed a series of 250 contractions at 25% and 50% of their isometric maximal voluntary contraction (MVC) at 40 and 80°·s−1. Fatigue defined as a decrease of the contractile capacity of the Muscles was studied by means of a 15-s maximal test-contraction following the exercise. Both the initial force and the force decrement during the test-contraction were studied. Surface electromyogram (EMG) signals of the main tracts of the Erector Spinae Muscle were recorded. The frequency content was studied by calculating the zero-crossing rate for the signals obtained during dynamic contractions and by means of fast Fourier transformation for the test contraction. After the 50% MVC dynamic contractions the initial force during the postexercise test-contraction was significantly lower than after the 25% MVC contractions. No significant influence of contraction velocity on fatigue development was found. The force decrement during the test-contraction did not depend on the experimental conditions. The EMG amplitude indicated that the subjects were better able to relax their Muscles during the counter movement (flexion) at high forces and high velocities compared to the other experimental conditions. The frequency content of the EMG signals during the dynamic contractions and the postexercise test-contraction showed only very weak relationships with fatigue. Therefore, spectrum EMG parameters as determined in the present study do not seem suitable as indicators of Muscle fatigue as a consequence of dynamic contractions of trunk extensor Muscles.

  • An investigation into the relevance of the pattern of temporal activation with respect to Erector Spinae Muscle endurance
    European Journal of Applied Physiology, 1993
    Co-Authors: Jaap H. Van Dieën, Huub H.e. Oude Vrielink, Huub M. Toussaint
    Abstract:

    The aim of the present study was to evaluate the viability of a relationship between the temporal activation pattern of parts of the Erector Spinae Muscle and endurance. Seven subjects performed intermittent isometric contractions [4 s at 7007o maximal voluntary contraction (MVC), 2 s rest] until exhaustion, during which the electromyographical (EMG) activity of the multifidus, iliocostalis thoracis and longissimus Muscle segments was recorded. Endurance was defined as the time until exhaustion. Subjects were divided into a high and a low endurance group. The high endurance group showed significantly more variability of EMG amplitude over succeeding contractions. This group demonstrated significantly more alternations of EMG activity between parts of the Muscle also. Variability of the EMG amplitude within the contractions did not differ between the groups, nor did MVC. The results indicated that alternating activity between different parts of the Erector Spinae Muscle may function to postpone exhaustion of this Muscle as a whole.