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Acute Effects of Isometric Handgrip Exercise on Blood Pressure and Heart Rate Variability
Author(s) -
Locke Ben
Publication year - 2016
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.30.1_supplement.761.7
Subject(s) - isometric exercise , cardiology , medicine , heart rate , blood pressure , repeated measures design , analysis of variance , physical therapy , heart rate variability , physical medicine and rehabilitation , mathematics , statistics
Isometric handgrip (IHG) exercise has been shown to elicit post‐exercise hypotension and transient improvements in heart rate variability (HRV) after one session. Typical IHG efforts are held at 30% of maximal voluntary contraction (MVC), with few studies deviating from this intensity. The purpose of this study is to assess the acute effects of different IHG exercise intensities on blood pressure (BP) and HRV. In a crossover study, 20 participants (18–30 years of age) will complete two IHG exercise protocols: (1) four 2‐min isometric contractions at 30% MVC with 2‐min rest periods using the dominant arm, and (2) four 45‐s isometric contractions at 50% MVC with 1‐min rest periods using the dominant arm. BP and HRV will be recorded using a continuous noninvasive arterial pressure (CNAP) monitor and three lead electrocardiography (ECG), respectively, at pre‐exercise, 5‐min post‐exercise, and 15‐min post‐exercise. BP will also be recorded continuously during both exercise protocols to measure BP responses after each IHG contraction. Statistical analysis for BP and HRV will be performed using a 2 × 3 repeated measures ANOVA. Secondary analysis of BP at the end of each isometric contraction will be conducted using a 2 × 5 repeated measures ANOVA. Statistical significance will be set to P < 0.05.