Heart rate alteration during a constant load exercisein the different menstrual phases

Risultato della ricerca: Other

Abstract

In fitness centres, the most common way to modulate exercise’s intensityis heart rate (HR) control and therefore training at constant heart rate(CHR) is widely used but this method assume that exercise’s response toexercise should be always the same; Instead there are conflicting resultsabout menstrual cycle’s effects on physiological response to exercise(Jense de Jonge 2003). Many researches have investigated the influencesof estrogenic hormone levels in sport performance (Sarwar 2006;Phililps 1996), muscle strength and heart rate during maximal and submaximalexercise (Oosthuyse 2005; Kishali 2006). No study has attemptto verify if CHR correspond to a constant load of endurance exercisethroughout the 28 days of menstrual cycle and therefore if this methodcould be suitable to right size training stimulus also in the different phasesof menstrual cycle.20 women (25±8,66 years old an 56,1±8,82 kg) was tested at cycloergometerin each phases of menstrual cycle (follicular (FOL) days 1-13,ovulation (OV) days 14-15, luteal (LUT) days 15-21, menstruation(MES) days 21-28); subjects didn’t take oral contraceptive during the experimentperiod. Cycle phases were preliminary confirmed by temperatureand LH urine concentration measurement (Lebrun 2003). HR, bloodlactated and RPE value was collected and analysed during every trainingsession (FOL, LUT, OV, MES).The results showed a significantly lower HR during the MES phase comparedto the other phases whilst there were no significant changes in othervariables: blood lactate and RPE values, confirming the steadfastnessof the internal load.These results suggest that ovarian hormones variation during menstrualcycle could influence heart response to constant load endurance exercise.In conclusion our data suggests that CHR could underestimate exertionduring the menstrual phase therefore female subjects would be forced to increase the external load to maintain the same (supposed) relative trainingintensity.References• Janse de Jonge XA. Sports Med. 2003;33(11):833-51• Sarwar R et al. J Physiol. 1996 May 15;493 ( Pt 1):267-72• Philips SK et al. J Physiol. 1996 Oct 15;496 ( Pt 2):551-7• Oosthuyse T et al. Eur J Appl Physiol. 2005 Jun;94(3):268-76• Kishali NF et al. Int J Neurosci. 2006 Dec;116(12):1549-63• Lebrun CM et al. Br J Sports Med. 2003 Aug;37(4):315-20
Lingua originaleEnglish
Pagine16-16
Numero di pagine1
Stato di pubblicazionePublished - 2012

    Fingerprint

Cita questo