Effects and mechanism of inspiratory muscle training on diaphragm in ventilator-induced diaphragmatic dysfunction rats
10.3969/j.issn.1001-1242.2025.10.002
- VernacularTitle:吸气肌训练对呼吸机相关性膈肌功能障碍大鼠膈肌的影响及机制研究
- Author:
Shiwen LI
1
;
Xinyi LI
1
;
Yongli DAI
1
Author Information
1. 大连医科大学附属第二医院康复医学科,辽宁省 大连市,116000
- Publication Type:Journal Article
- Keywords:
ventilator induced diaphragmatic dysfunction;
inspiratory muscle training;
mechanical ventilation;
calpain;
oxidative stress
- From:
Chinese Journal of Rehabilitation Medicine
2025;40(10):1459-1465
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the effect of inspiratory muscle training on diaphragm morphology and function in ventilator induced diaphragmatic dysfunction(VIDD)rats,and to explore the mechanism of it.Method:Twenty-four adult female SD rats were randomly divided into 4 groups:①Control group(n=6);②Me-chanical ventilation group(n=6):mechanical ventilation for 24 hours;③Sham training group(n=6):spontane-ous breathing for 1 hour after mechanical ventilation for 24 hours;④Training group(n=6):intermittent inspi-ratory muscle training for 1 hour after mechanical ventilation for 24 hours.Multi-channel physiology signal col-lection and processing system were used to detect the peak twitch tension and peak tetanic force of dia-phragm,as well as the frequency-force effect curve.The cross-sectional area(CSA)of diaphragm was ob-served by hematoxylin and eosin staining method.Western-blot was used to detect the level of microtubule-as-sociated protein 1 light chain 3(LC3)and muscle atrophy F-box(MAFbx).The levels of αII-spectrin break-down products(SBDPs)SBDP145 and SBDP120 in the diaphragm were detected by ELISA.The level of malondialdehyde(MDA)in the diaphragm was detected by thiobarbituric acid(TBA)method.Result:Compared with control group and training group,the peak twitch tension,peak tetanic force and fre-quency-force effect curve of diaphragm in ventilation group and sham training group were decreased significant-ly(P<0.05),but there was no difference between the ventilation group and the sham training group or be-tween the control group and the training group.Compared with the control group,the diaphragm fiber cross-sectional area of ventilation group,sham training group or training group was significantly decreased(P<0.05),and there was no significant difference between the ventilation group and the sham training group.Compared with the ventilation group and the sham training group,the diaphragm fiber cross-sectional area of training group was increased(P<0.05).Compared with the control group,the level of MDA,SBDP120 and LC3II/I ratio in the diaphragm of ventilation group,sham training group and training group were significantly in-creased(P<0.05),and there was no difference between the ventilation group,the sham training group and the training group.Compared with the control group,the expression of MAFbx in ventilation group was signif-icantly increased(P<0.05),and there was no difference between the ventilation group,the sham training group and the training group.Compared with the control group and the training group,SBDP145 level in the diaphragm of ventilation group or sham training group was significantly increased(P<0.05),but there was no difference between the ventilation group and the sham training group.There was no difference in SBDP145 lev-el of diaphragm between the control group and the training group.Conclusion:Inspiratory muscle training can improve the morphology and function of VIDD diaphragm,and the mechanism may be related to the decrease of calpain activity.
