Document Detail

Electromyographic response to exercise in cardiac transplant patients: a new method for anaerobic threshold determination?
MedLine Citation:
PMID:  9187176     Owner:  NLM     Status:  MEDLINE    
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.
A Lucía; A F Vaquero; M Pérez; O Sánchez; V Sánchez; M A Gómez; J L Chicharro
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Chest     Volume:  111     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-07-03     Completed Date:  1997-07-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1571-6     Citation Subset:  AIM; IM    
Unidad de Investigación, Escuela de Medicina de la Educación Física y el Deporte, Universidad Complutense de Madrid, Spain.
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MeSH Terms
Anaerobic Threshold / physiology*
Analysis of Variance
Breath Tests
Electromyography / instrumentation,  methods*,  statistics & numerical data
Exercise / physiology*
Exercise Test / methods
Heart Transplantation / physiology*
Lactates / blood
Middle Aged
Pulmonary Ventilation
Reg. No./Substance:

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