title: The effect of three weeks green tea extract consumption on blood pressure, heart rate responses to a single bout resistance exercise in hypertensive women.
abstract: BACKGROUND
  Resistance exercise (RE) may lead to a post-exercise hypotension (PEH) response. Previous studies showed that green tea (GT) and its polyphenols, especially Epigallocatechin-3-gallate (EGCG) may have a favorable effect on blood pressure (BP).
  
  
  OBJECTIVE
  We investigated the green tea extract (GTE) effects on BP, heart rate (HR), and rate pressure product (RPP) responses to a low-intensity RE in hypertensive women.
  
  
  METHODS
  Middle-aged women (n = 24, 46.4 ± 6.3 years old; 66.6 ± 9.2 kg; 166.3 ± 4.2 cm) were randomly assigned into three groups of eight persons. GTE consumption group (T) and RE group (R), respectively, ingested GTE (~75 mg EGCG) and placebo (PL; maltodextrin) capsules two times a day for three weeks and then completed 2 circuits of six RE using 50% one repetition maximum (1RM). Patients of control group (C) just ingested PL and rested in a non-exercise control trial. BP, HR and RPP were measured prior and post-exercise at 0, 15, 30, 45, and 60 min.
  
  
  RESULTS
  The repeated measures analysis of variance (ANOVA) revealed that there were no significant alterations for arterial BP, HR and RPP of C group. HR of T and R groups was increased immediately after RE. A significant fall of systolic BP (SBP) and diastolic BP (DBP) occurred in both T and R groups for 60 min post-exercise compared to resting values. Mean arterial BP (MAP) and RPP decreased significantly after RE in both exercise groups from 15 to 60 min. During 45 and 60 time points, T group had a lower RPP values than C group. The differences between T and R groups were only MAP at 0 and 15 time points.
  
  
  CONCLUSIONS
  Three weeks of GTE ingestion did not influenced SBP, DBP and HR but may be have a favorable effect on MAP and RPP responses to an acute RE during 1 h recovery of exercise.
authors.affiliation: Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, P.O.Box 1438, Rasht, Iran, hamidarazi@yahoo.com.
authors.forename: Hamid
authors.initials: H
authors.lastname: Arazi
authors.forename: Nader
authors.initials: N
authors.lastname: Samami
authors.forename: Jalal
authors.initials: J
authors.lastname: Kheirkhah
authors.forename: Behzad
authors.initials: B
authors.lastname: Taati
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000975:Antioxidants / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology; D002318:Cardiovascular Diseases / Q000453:epidemiology / Q000503:physiopathology; D002392:Catechin / Q000031:analogs & derivatives / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005260:Female; D006339:Heart Rate / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D006973:Hypertension / Q000150:complications / Q000188:drug therapy / Q000503:physiopathology*; D008875:Middle Aged; D010936:Plant Extracts / Q000494:pharmacology*; D055070:Resistance Training; D012307:Risk Factors; D013662:Tea; D016896:Treatment Outcome
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D013662:Tea; D002392:Catechin; C045651:epigallocatechin gallate