Mental work stimulates cardiovascular responses through a reduction in cardiac parasympathetic modulation in men and women

Auteur(s): Pérusse-Lachance, ÉmilieTremblay, AngeloChaput, Jean-PhilippePoirier, PaulTeasdale, NormandDrapeau, VickySénécal, CarolineBrassard, Patrice
Résumé: Mental Work (MW) stimulates Cardiovascular (CV) functions in healthy adults and a reduction in cardiac parasympathetic modulation could be one mechanism involved in such a response. The influence of sex on these CV responses remains ambiguous. The aim of the study was to evaluate CV impacts of MW in healthy individuals and whether sex influences CV responses induced by MW. The impact of a 45-min reading and writing session vs. a control condition, on Blood Pressure (BP), Heart Rate (HR), and Heart Rate Variability (HRV), was evaluated in 44 healthy adults with the use of a randomized crossover design. The influence of sex on those variables was then evaluated. Diastolic BP (74 ± 1 vs. 69 ± 1 mmHg; p < 0.05) and mean arterial pressure (MAP; 87 ± 7 vs. 83 ± 8 mmHg; p < 0.005), HR (68 ± 1 vs. 62 ± 1 bpm; p < 0.0001) and low frequency/high frequency ratio (2.8 ± 0.1 vs. 2.0 ± 0.1; p < 0.0001) were higher, while global HRV (SDNN: 84 ± 3 vs.104 ± 3 ms; p < 0.0001) and cardiac parasympathetic activity were lower during MW (p < 0.0001) vs. the control condition in the whole sample. During both experimental conditions, HR was higher (p < 0.0001), while BP, rMSSD, pNN50 and low frequency component of HRV were lower in women compared to men (all p < 0.05). The intensity of the cognitive demand and its influence on CV variables were comparable between men and women. These results support that MW increases BP and HR through decrement in cardiac parasympathetic modulation in healthy subjects and suggest that sex does not influence CV responses induced by cognitive demand of similar intensity.
Type de document: Article de recherche
Date de publication: 13 juin 2012
Date de la mise en libre accès: 12 septembre 2017
Version du document: VoR
Lien permanent: http://hdl.handle.net/20.500.11794/15365
Ce document a été publié dans: Bioenergetics, Vol. 02 (01), 1-6 (2013)
http://dx.doi.org/10.4172/2167-7662.1000107
OMICS Publishing Group
Autre version disponible: 10.4172/2167-7662.1000107
Collection :Articles publiés dans des revues avec comité de lecture

Tous les documents dans CorpusUL sont protégés par la Loi sur le droit d'auteur du Canada.