Correlations Between Myoelectric and Hemodynamic Parameters Changes in Biceps Brachii During Sustained Isometric Contraction in Healthy Elderly  

作　　者：Cristian Zampella Luca Calanni Marco Barbero Corrado Cescon Giuseppe Giovanetti Massimo Negro Giuseppe D’Antona 

机构地区：[1]CRIAMS-Sport Medicine Centre,University of Pavia,Voghera,Italy [2]Rehabilitation Research Laboratory 2rLab,Department of Business Economics,Health and Social Care,University of Applied Sciences and Arts of Southern Switzerland,Manno,Switzerland [3]Department of Public Health,Experimental and Forensic Medicine and Sport Medicine Centre Voghera,University of Pavia,Via Foscolo,13,27058 Voghera,Pavia,Italy

出　　处：《Journal of Science in Sport and Exercise》2019年第2期116-123,共8页体育运动科学（英文）

摘　　要：Purpose The purpose of the present study was to evaluate the Pearson correlations between hemodynamic parameters obtained with near infrared spectroscopy (NIRS), namely total hemoglobin (tHb) and tissue oxygen index (TOI %), as indica-tors of blood flow and oxygen extraction, and myoelectric parameters obtained with surface multichannel electromyography (sEMG), namely fractal dimension (FD) and conduction velocity (CV) slopes, as descriptors of central and peripheral fatigue, during sustained high level isometric contractions at 60% maximal voluntary contraction (MVC), in elderly subjects. Methods Ten recreationally healthy elderly subjects (age 67.7 ± 4.6 years), 5 males and 5 females, performed one isometric contraction of the elbow flexors at 120° joint angle at 60% of MVC until exhaustion in two subsequent trials 1 week apart, one for the sEMG and the other one for NIRS recordings from the biceps brachii. Results A negative strong Pearson’s correlation between TOI % slope in the functional hyperemic phase (HP) of contrac-tion and a positive correlation between the slope of TOI % recorded during the ischemic phase (IP) and the CV slope were found (r = − 0.76, P < 0.05;r = 0.91, P < 0.01, respectively). A negative strong correlation between tHb IP slope and tHb HP slope and TOI % IP slope and TOI % HP slope (r = − 0.78, P < 0.01;r = − 0.78, P < 0.01, respectively) were also found. No correlation was found between FD slope and hemodynamic parameters (FD slope vs. HP tHb slope, r = − 0.19;FD slope vs. IP tHb slope, r = 0.16;FD slope vs. HP TOI % slope, r = 0.19;FD slope vs. IP TOI % slope, r = 0.27). Conclusion In aged individuals, CV slope correlated with muscle O2 desaturation (TOI %) rather than reduced muscle blood flow (tHb) in the ischemic phase of isometric contraction to exhaustion. No correlations were found between myoelectric manifestations of central fatigue (FD slope) and data obtained by NIRS.

关 键 词：Correlation between NIRS sEMG during muscle contraction 

分 类 号：O17[理学—数学]