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Effects of resistance interval and constant training on muscular hemodynamic kinetics in sedentary men
Author(s) -
Chiang ChengLing,
Wang JongShyan
Publication year - 2013
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.27.1_supplement.1132.8
Subject(s) - hemodynamics , cardiology , medicine , resistance training , randomized controlled trial , muscular fatigue , isokinetic exercise , interval training , physical therapy
This study investigated the effects of resistance interval (RIT) and constant (RCT) training on muscular hemodynamic/metabolic responses to isokinetic exercise. Twelve sedentary males were randomly divided into RIT and RCT groups. The subjects were trained at alternating 60°–180°/s (RIT, n=6) or constant 120°/s (RCT, n=6) in knee extension/flexion for 6 to 10 sessions for 2 days/week for 6 weeks. A muscle fatigue test was performed at isokinetic contraction with 180°/s for 30 repetitions. A near‐infrared spectroscopy was applied to assess dynamic changes of [HHb] in vastus lateralis. The kinetics formula is: HHb(t)=HHb(b)+Ai(1−e−(t−TDi)/τi)+Ap(1−e−(t−TDp)/τp)+As(1−e−(t−TDs)/τs).HHb (b) is rest baseline value, and the subscripts i, p and s refer to initial, primary, and slow components, respectively. A is the asymptotic amplitude for the exponential term; τ is the time constant; and TD is time delays. The TDp and τp were summed to provide an indication of the overall dynamics of the initial and primary component (MRT). The results indicated that RIT significantly reduced the values of TDp, τp, Ap, and MRT during isokinetic contraction. However, no significant changes in muscular hemodynamic kinetics occurred following RCT. Hence, we conclude that RIT effectively improves hemodynamic/metablobic efficiencies in contracting skeletal muscles compared to RCT.