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The effects of exogenous hormones on maximal and submaximal responses to high intensity interval training
Author(s) -
Zierke Jennifer Marie,
Turner Rebekah Joy,
Parker Daryl,
Quintana Roberto
Publication year - 2010
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.24.1_supplement.lb637
Subject(s) - high intensity interval training , interval training , medicine , vo2 max , cycle ergometer , endocrinology , hormone , heart rate , cardiology , physical therapy , zoology , blood pressure , biology
High intensity interval training (HIIT) leads to VO 2max improvements in 2‐weeks (Talanian, 2007). Long term (≥ 4 months) exogenous hormone (EH) use can decrease VO 2max by 11% (Casazza, 2002). It is unknown whether EH impairs exercise training induced adaptations. PURPOSE The purpose of this study was to investigate the effects of seven HIIT sessions over 2 weeks on maximal and submaximal (sub max ) physiological responses to exercise in women taking EH. METHODS Sixteen healthy women of average fitness, VO 2max = 40.29±7.51, volunteered for this study (n=8 EH, n=8CON). Prior to participating in the study, the EH women were taking a monophasic or triphasic oral contraceptive pill for ≥ 6 months and CON were regularly menstruating. VO 2max and sub max testing (10% below VT 1 ) were performed on a cycle ergometer pre and post HIIT. Statistical comparisons were made between EH and CON to determine the physiological adaptations that occurred with HIIT. RESULTS CON had a significant decrease in sub max HR (148±6.1vs136±4.7bpm, p=0.02), and an increase in O 2pulse (10.36±.81vs10.98±.81 ml/bpm, p=0.02). The EH had a significant increase in dBP (59.7±3.0vs65.2±3.12mmHg). There were no other significant differences between groups. CONCLUSION EH use alters submax cardiovascular training responses without affecting VO2max. EH use blunts HR, dBP, and O2pulse adaptations to HIIT.