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Logo for the Journal of Rehab R&D
Volume 42 Number 4, July/August 2005
Pages 511 — 522


Abstract - Effects of ischemic training on leg exercise endurance

Jack A. Loeppky, PhD;1* Burke Gurney, PhD;2 Yoshio Kobayashi, PhD;3 Milton V. Icenogle, MD1

1Cardiology Section, Department of Veterans Affairs Medical Center, Albuquerque, NM; 2Department of Orthopaedics and Rehabilitation, University of New Mexico Health Sciences Center, Albuquerque, NM; 3Laboratory for Health and Human Performance, School of Arts and Sciences, Chukyo University, Nagoya, Japan
Abstract — This study tested whether ischemic exercise training (TrIS+EX) would increase endurance of ischemic (ExIS) and ramp exercise (ExRA) knee-extension tests more than exercise training (TrEX) alone. Ten healthy subjects performed pre- and posttraining tests with each leg. For ExRA, after subjects warmed up, a weight was added each minute until they were exhausted. ExIS was similar, but after warm-up, we inflated a thigh cuff to 150 mmHg instead of adding weights. One leg was chosen for TrIS+EX (cuff inflated to 150 mmHg during exercise) and the other for TrEX, both with a small weight on each leg, four to six times per daily session for 3 to 5 min each, 5 days per week for 6 weeks. ExIS duration increased 120% more (p = 0.002) in the TrIS+EX leg than in the contralateral TrEX leg, whereas ExRA duration increased only 16% (nonsignificant). TrIS+EX and TrEX significantly attenuated the ventilation increase (ergoreflex) during ExIS. The O2 debt for ExIS was significantly lower and systolic blood pressure recovery was faster after TrIS+EX than after TrEX. Heart rate recovery after ExRA and ExIS was faster after TrIS+EX. Apparently, TrIS+EX with low-intensity resistance increases exercise endurance and attenuates the ergoreflex and therefore may be a useful tool to increase regional muscle endurance to improve systemic exercise capacity in patients.
Key words: congestive heart failure, ergoreflex, frequency spectrum, heart rate recovery, ischemia, ischemic training, oxygen debt, ramp exercise, surface-recorded electromyogram (sEMG), ventilation response.

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