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Electromyographic Response to Exercise in Cardiac Transplant Patients : A New Method for Anaerobic Threshold Determination?

Alejandro Lucía; Almudena F. Vaquero; Margarita Pérez; Oscar Sánchez; Violeta Sánchez; Miguel A. Gómez; José L. Chicharro
Author and Funding Information

Affiliations: From the Unidad de Investigatión, Escuela de Medicina de la Educatión Física y el Deporte, Universidad Complutense de Madrid, Spain,  From the Unidad de Transplante Cardíaco, Hospital 12 de Octubre, Madrid, Spain

Affiliations: From the Unidad de Investigatión, Escuela de Medicina de la Educatión Física y el Deporte, Universidad Complutense de Madrid, Spain,  From the Unidad de Transplante Cardíaco, Hospital 12 de Octubre, Madrid, Spain


1997 by the American College of Chest Physicians


Chest. 1997;111(6):1571-1576. doi:10.1378/chest.111.6.1571
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Abstract

The purpose of this study was to investigate the possible use of integrated surface electromyography (iEMG) in cardiac transplant patients (CTPs) as a new noninvasive determinant of the metabolic response to exercise by studying the relationship between the iEMG threshold (iEMGT) and other more conventional methods for anaerobic threshold (AT) determination, such as the lactate threshold (LT) and the ventilatory threshold (VT). Thirteen patients (age: 57±7 years, mean±SD; height: 163±7 cm; body mass: 70.5±8.6 kg; posttransplant time: 87±49 weeks) were selected as subjects. Each of them performed a ramp protocol on a cycle ergometer (starting at 0 W, the workload was increased in 10 W/min). During the tests, gas exchange data, blood lactate levels, and iEMG of the vastus lateralis were collected to determine VT, LT, and iEMGT, respectively. The results evidenced no significant difference between mean values of VT, LT, or iEMGT, when expressed either as oxygen uptake (11.1±2.4, 11.7±2.3, and 11.0±2.8 mL/kg/min, respectively) or as percent maximum oxygen uptake (61.6±7.5, 62.2±7.7, and 59.6±8.2%, respectively). In conclusion, our findings suggest that iEMG might be used as a complementary, noninvasive method for AT determination in CTPs. In addition, since the aerobic impairment of these patients is largely due to peripheral limitation, determination of iEMGT could be used to assess the effectiveness of an exercise rehabilitation program to improve muscle aerobic capacity in CTPs.


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