Agathe Bridoux1, Alain Créange2, Aude Sangare3, Samar S Ayache4, Hassan Hosseini2, Xavier Drouot4, Jean-Pascal Lefaucheur4. 1. Université Paris Est Créteil, Faculté de Médecine, EA 4391, Créteil F-94010, France; AP-HP, Groupe Henri Mondor, Service de Physiologie, Explorations Fonctionnelles, Créteil F-94010, France. Electronic address: agathe.bridoux@hmn.aphp.fr. 2. Université Paris Est Créteil, Faculté de Médecine, EA 4391, Créteil F-94010, France; AP-HP, Groupe Henri Mondor, Service de Neurologie, Créteil F-94010, France. 3. AP-HP, Groupe Henri Mondor, Service de Physiologie, Explorations Fonctionnelles, Créteil F-94010, France. 4. Université Paris Est Créteil, Faculté de Médecine, EA 4391, Créteil F-94010, France; AP-HP, Groupe Henri Mondor, Service de Physiologie, Explorations Fonctionnelles, Créteil F-94010, France.
Abstract
OBJECTIVE: To compare the beneficial effect of nap versus rest on the recovery of motor evoked potentials (MEPs) after a fatiguing exercise performed in patients with multiple sclerosis (MS) and healthy controls. METHODS: In 12 MS patients and 12 healthy controls, MEPs were recorded from the adductor pollicis muscle before, 10 and 60 min (T0, T10, and T60) after an effort of thumb adduction at 25% of maximal voluntary contraction force for 24 min. After the effort, the subject was maintained at rest or invited to have a nap while monitored with polysomnography. The two sessions (nap and rest) were randomly performed in each subject during the same day. The impact of nap and rest on post-exercise changes in MEP amplitude were studied in each group (patients and controls) and then compared between the two groups. RESULTS: Although MEP amplitude at baseline was lower in MS patients than in controls, post-exercise corticomotor depression (PECD), expressed as T10/T0 MEP amplitude ratio, was similar in both groups. Regarding MEP amplitude recovery at T60, nap was significantly more beneficial than rest in healthy subjects, but not in MS patients. CONCLUSION: Motor recovery from PECD following a fatiguing exercise can be enhanced by sleep (at least a short nap) in healthy subjects. In MS patients, sleep restorative effect is reduced or lost, maybe contributing to the excessive fatigue or fatigability characterized in these patients.
OBJECTIVE: To compare the beneficial effect of nap versus rest on the recovery of motor evoked potentials (MEPs) after a fatiguing exercise performed in patients with multiple sclerosis (MS) and healthy controls. METHODS: In 12 MSpatients and 12 healthy controls, MEPs were recorded from the adductor pollicis muscle before, 10 and 60 min (T0, T10, and T60) after an effort of thumb adduction at 25% of maximal voluntary contraction force for 24 min. After the effort, the subject was maintained at rest or invited to have a nap while monitored with polysomnography. The two sessions (nap and rest) were randomly performed in each subject during the same day. The impact of nap and rest on post-exercise changes in MEP amplitude were studied in each group (patients and controls) and then compared between the two groups. RESULTS: Although MEP amplitude at baseline was lower in MSpatients than in controls, post-exercise corticomotor depression (PECD), expressed as T10/T0 MEP amplitude ratio, was similar in both groups. Regarding MEP amplitude recovery at T60, nap was significantly more beneficial than rest in healthy subjects, but not in MSpatients. CONCLUSION: Motor recovery from PECD following a fatiguing exercise can be enhanced by sleep (at least a short nap) in healthy subjects. In MSpatients, sleep restorative effect is reduced or lost, maybe contributing to the excessive fatigue or fatigability characterized in these patients.
Authors: Fioravante Capone; Francesco Motolese; Emma Falato; Mariagrazia Rossi; Vincenzo Di Lazzaro Journal: Front Neurol Date: 2020-04-22 Impact factor: 4.003