Central and peripheral quadriceps fatigue in congestive heart failure

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Presentation transcript:

Central and peripheral quadriceps fatigue in congestive heart failure Nicholas S. Hopkinson, Mark J. Dayer, Sophie Antoine-Jonville, Elisabeth B. Swallow, Raphael Porcher, Ali Vazir, Philip Poole-Wilson, Michael I. Polkey International Journal of Cardiology Volume 167, Issue 6, Pages 2594-2599 (September 2013) DOI: 10.1016/j.ijcard.2012.06.064 Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 Schematic of the protocol that all subjects underwent. The rest period lasted 30min. Assessments were made at baseline and at 10, 30, 60 and 90min after the intervention (either rest or exercise). TMS transcranial magnetic stimulation; TwQu Quadriceps twitch in response to femoral nerve stimulation; MVC quadriceps maximum voluntary contraction. International Journal of Cardiology 2013 167, 2594-2599DOI: (10.1016/j.ijcard.2012.06.064) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Change in force of peripheral quadriceps twitches over time in control subjects (A) and patients (B) relative to baseline expressed as a percentage. There was a significant difference in the pattern of the response between the two interventions in both groups (Controls: p=0.002, CHF: p=0.019). Difference between interventions at 10min: *p<0.001, **p=0.037. International Journal of Cardiology 2013 167, 2594-2599DOI: (10.1016/j.ijcard.2012.06.064) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Change in magnitude of the force of maximal voluntary contractions (MVC) over time in control subjects (A) and patients (B) (n=9 in both groups) relative to baseline expressed as a percentage. There was no significant difference in the pattern of the response between the two interventions in both groups (Controls p=0.44, CHF p=0.084). International Journal of Cardiology 2013 167, 2594-2599DOI: (10.1016/j.ijcard.2012.06.064) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 Change in motor evoked potential (MEP) over time in control subjects (A) and patients (B), corrected for changes in the compound muscle action potential (CMAP) relative to baseline expressed as a percentage. There was a significant difference in the pattern of the response between the control subjects and patients (p=0.048). Difference between interventions at 10min: *p=0.024, **p=0.037. International Journal of Cardiology 2013 167, 2594-2599DOI: (10.1016/j.ijcard.2012.06.064) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 5 Changes in the compound muscle action potential (CMAP) over time in control subjects (A) and patients (B) expressed as a percentage. There was no significant change in the electrical response to peripheral stimulation in either group in either condition. International Journal of Cardiology 2013 167, 2594-2599DOI: (10.1016/j.ijcard.2012.06.064) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 6 Changes in the latency in milliseconds (ms) of the motor evoked potential (MEP) over time in control subjects (A) and patients (B). There was no significant change in the latency in either group in either condition. International Journal of Cardiology 2013 167, 2594-2599DOI: (10.1016/j.ijcard.2012.06.064) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions