The Activation of Muscle Spindles Enhances the Thixotropic Behavior of Rib Cage Respiratory Muscles.

Shibata, Masahiko; Izumizaki, Masahiko; Homma, Ikuo

doi:10.2170/jjphysiol.53.243

Cited by 5 publications

(7 citation statements)

References 13 publications

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“…Inspiratory muscle conditioning based on the principles of muscle thixotropy acutely alters the end‐expiratory position of the respiratory system during resting breathing 6–11 . Thixotropy conditioning of inspiratory muscles involves inspiratory muscle contraction at an inflated or deflated lung volume because inspiratory muscles shorten and lengthen with lung inflation and deflation, respectively 12–15 .…”

Section: Introductionmentioning

confidence: 99%

“…5 Inspiratory muscle conditioning based on the principles of muscle thixotropy acutely alters the end-expiratory position of the respiratory system during resting breathing. [6][7][8][9][10][11] Thixotropy conditioning of inspiratory muscles involves inspiratory muscle contraction at an inflated or deflated lung volume because inspiratory muscles shorten and lengthen with lung inflation and deflation, respectively. [12][13][14][15] Conditioning performed below FRC, which corresponds to hold-long conditioning of inspiratory muscles, is followed by decreases in end-expiratory chest wall volume (Vcw); conditioning performed above FRC, which corresponds to hold-short conditioning of inspiratory muscles, is followed by increases in end-expiratory Vcw.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thixotropy conditioning of inspiratory muscles on the chest wall response to CPAP

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of thixotropy conditioning of inspiratory muscles on the chest wall response to CPAP

et al. 2008

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“…Conditioning for developing inspiratory muscle thixotropy involves inspiratory muscle contraction at an inflated or deflated lung volume (VL) (18,20,27). Inspiratory muscles include the diaphragm, the external intercostals, and the parasternal intercostals, and these muscles shorten and lengthen with lung inflation and deflation, respectively (3,(5)(6)(7).…”

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confidence: 99%

Acute effects of thixotropy conditioning of inspiratory muscles on end-expiratory chest wall and lung volumes in normal humans

Izumizaki

Iwase²,

Ohshima³

et al. 2006

Journal of Applied Physiology

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Thixotropy conditioning of inspiratory muscles consisting of maximal inspiratory effort performed at an inflated lung volume is followed by an increase in end-expiratory position of the rib cage in normal human subjects. When performed at a deflated lung volume, conditioning is followed by a reduction in end-expiratory position. The present study was performed to determine whether changes in end-expiratory chest wall and lung volumes occur after thixotropy conditioning. We first examined the acute effects of conditioning on chest wall volume during subsequent five-breath cycles using respiratory inductive plethysmography (n = 8). End-expiratory chest wall volume increased after conditioning at an inflated lung volume (P < 0.05), which was attained mainly by rib cage movements. Conditioning at a deflated lung volume was followed by reductions in end-expiratory chest wall volume, which was explained by rib cage and abdominal volume changes (P < 0.05). End-expiratory esophageal pressure decreased and increased after conditioning at inflated and deflated lung volumes, respectively (n = 3). These changes in end-expiratory volumes and esophageal pressure were greatest for the first breath after conditioning. We also found that an increase in spirometrically determined inspiratory capacity (n = 13) was maintained for 3 min after conditioning at a deflated lung volume, and a decrease for 1 min after conditioning at an inflated lung volume. Helium-dilution end-expiratory lung volume increased and decreased after conditioning at inflated and deflated lung volumes, respectively (both P < 0.05; n = 11). These results suggest that thixotropy conditioning changes end-expiratory volume of the chest wall and lung in normal human subjects.

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“…We have reported that inspiratory muscle conditioning based on the principles of muscle thixotropy acutely changes end-expiratory chest wall volume (Vcw) and lung volume in healthy humans and patients with chronic obstructive pulmonary disease (COPD) [6][7][8][9][10]. Thixotropy conditioning of inspiratory muscles involves inspiratory muscle contraction at an inflated or deflated lung volume [6][7][8][9][10].…”

mentioning

confidence: 99%

“…Thixotropy conditioning of inspiratory muscles involves inspiratory muscle contraction at an inflated or deflated lung volume [6][7][8][9][10]. Inspiratory muscles include the diaphragm, the external intercostals, and the parasternal intercostals, and these muscles shorten and lengthen with lung inflation and deflation, respectively [11][12][13][14].…”

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confidence: 99%

Chest Wall Motion after Thixotropy Conditioning of Inspiratory Muscles in Healthy Humans

et al. 2006

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Abstract:Inspiratory muscle conditioning at a lower or higher lung volume based on the principles of muscle thixotropy causes acute changes in end-expiratory chest wall and lung volumes. The present study aimed to demonstrate the time course of effects of this conditioning on both end-expiratory chest wall volume and thoracoabdominal synchrony. We measured chest wall motion with respiratory induction plethysmography at 0.5, 1, 2, 3, and 6 min after conditioning at three different lung volumes in 15 healthy men. After conditioning at total lung capacity -20% inspiratory capacity, increases in end-expiratory chest wall volume were significant at 0.5, 1, and 2 min (P < 0.05), being most obvious at 0.5 min (∆0.24 ± 0.20 liter). After conditioning at residual volume, reductions in end-expiratory chest wall volume were significant at any time point (P < 0.05), being most obvious at 0.5 min (∆0.16 ± 0.08 liter). Conditioning at functional residual capacity had little effect on the volume. Spirometric inspiratory capacity at 6 min after conditioning at residual volume (2.68 ± 0.35 liter) was higher than the baseline value (2.53 ± 0.31 liter, P < 0.05). Reductions in the phase angle, quantified by the KonnoMead diagram, occurred after conditioning at residual volume at any time point (P < 0.05), being most obvious at 2 min (∆3.47 ± 3.02 degrees). In conclusion, there is a 6-min time course of changes in end-expiratory chest wall volume after conditioning. More synchronous motion between the rib cage and abdomen occurs after conditioning at residual volume.

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The Activation of Muscle Spindles Enhances the Thixotropic Behavior of Rib Cage Respiratory Muscles.

Cited by 5 publications

References 13 publications

Effect of thixotropy conditioning of inspiratory muscles on the chest wall response to CPAP

Effect of thixotropy conditioning of inspiratory muscles on the chest wall response to CPAP

Acute effects of thixotropy conditioning of inspiratory muscles on end-expiratory chest wall and lung volumes in normal humans

Chest Wall Motion after Thixotropy Conditioning of Inspiratory Muscles in Healthy Humans

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