Effects of resistance training combined with vascular occulsion or hypoxia on neuromuscular function in athletes
Author: Manimmanakorn, A.; Manimmanakorn, N.; Taylor, R.; Draper, N.; Billaut, F.; Shearman, J.P.; Hamlin, M.J.
Type: Journal article
Link to this item using this URL: http://equella.cpit.ac.nz/cpit/items/54de207f-cb0b-4a06-a86a-bf739ea36ef2/1/
The aim was to investigate the effects of low-load resistant training combined with vascular occlusion or normobaric hypoxic exposure, on neuromuscular function. In a randomised controlled trial, well-trained athletes took part in a 5-week training of knee flexor/extensor muscles in which low-load resistant exercise (20 % of one repetition maximum, 1-RM) was combined with either (1) an occlusion pressure of approximately 230 mmHg (KT, n = 10), (2) hypoxic air to generate an arterial blood oxygen saturation of ~80 % (HT, n = 10), or (3) with no additional stimulus (CT, n = 10). Before and after training, participants completed the following tests: 3-s maximal voluntary contraction (MVC3), 30-s MVC, and an endurance test (maximal number of repetitions at 20 % 1-RM, Reps20). Electromyographic activity (root mean square, RMS) was measured during tests and the cross-sectional area (CSA) of the quadriceps and hamstrings was measured pre- and post-training. Relative to CT, KT, and HT showed likely increases in MVC3 (11.0 ± 11.9 and 15.0 ± 13.1 %, mean ± 90 % confidence interval), MVC30 (10.2 ± 9.0 and 18.3 ± 17.4 %), and Reps20 (28.9 ± 23.7 and 23.3 ± 24.0 %). Compared to the CT group, CSA increased in the KT (7.6 ± 5.8) and HT groups (5.3 ± 3.0). KT had a large effect on RMS during MVC3, compared to CT (effect size 0.8) and HT (effect size 0.8). We suspect hypoxic conditions created within the muscles during vascular occlusion and hypoxic training may play a key role in these performance enhancements.
Citation: ["Manimmanakorn, A., Manimmanakorn, N., Taylor, R., Draper, N., Billaut, F., Shearman, J.P. & Hamlin, M.J. (2013). Effects of resistance training combined with vascular occulsion or hypoxia on neuromuscular function in athletes. Euopean Journal of Applied Physiology, 113(7), 1767-1774."]