Factors affecting occlusion pressure and ischemic preconditioning |
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| Authors: | Henry Brown Martyn J Binnie Brian Dawson Nicola Bullock Brendan R Scott Peter Peeling |
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| Institution: | 1. School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Crawley, Australia;2. Western Australian Institute of Sport, Mt Claremont, Australia;3. Australian Institute of Sport, Gold Coast, Australia;4. Australian Institute of Sport, Gold Coast, Australia;5. Australian Canoeing, Sydney, Australia;6. Bond University Institute of Health and Sport, Gold Coast, Australia;7. School of Psychology and Exercise Science, Murdoch University, Murdoch, Australia |
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| Abstract: | Purpose: To determine the effect of limb selection (upper/lower), cuff width (small (6?cm)/medium (13?cm) upper; medium/large (18?cm) lower) and anthropometry on arterial occlusion pressure (AOP) in ischemic preconditioning (IPC). Methods: Twenty athletes (10 females and 10 males) had surface anthropometry and dual x-ray absorptiometry (DXA) assessments before using Doppler ultrasound to confirm AOP for each limb. Subsequently, 5?min of occlusion occurred, with near-infrared spectroscopy (NIRS) measuring muscle oxygenation changes. Resultant AOP was compared between sexes, limbs and cuff sizes using linear regression models. Results: Mean AOP was higher in the lower limbs than the upper limbs (161?±?18 vs. 133?±?12?mm?Hg; p?p?p?=?.222). Sex and resting systolic blood pressure (SBP) accounted for 77% (small cuff) to 83% (medium cuff) of variance in AOP for upper limbs, and 61% (medium cuff) to 63% (large cuff) in lower limbs. Including anthropometry accounted for 82% (small cuff) to 89% (medium cuff) and 78% (medium cuff) to 79% (large cuff) of variance for upper and lower limbs, respectively. Adding DXA variables improved the explained variance up to 83% (small cuff) to 91% (medium cuff) and 79% (medium cuff) to 87% (large cuff) for upper and lower limbs, respectively. NIRS data showed significantly greater tissue oxygenation changes in upper versus lower limbs. Conclusions: The AOP in athletes is dependent on limb occluded, sex, SBP, limb and cuff size, and body composition. |
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| Keywords: | Physiology methodology body composition |
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