Why the study?
Does local vibration with blood flow restriction increase muscle activity and hormonal responses compared to local vibration alone in physically inactive males?
Does local vibration with blood flow restriction increase muscle activity and hormonal responses compared to local vibration alone in physically inactive males?
Adding blood flow restriction to local vibration exercise increases muscle activity and lactate response but does not induce significant anabolic hormonal responses in inactive males.
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No immediate clinical adoption of LV+BFR; leaves open long-term functional or hormonal effects in larger cohorts.
This study aimed to investigate the effects of single local vibration (LV) with and without blood flow restriction (BFR) on muscle activity and hormonal responses. A total of 12 physically inactive males were exposed to 10 sets of intermittent LV (35-40 Hz) on unilateral mid-quadriceps in the supine lying position and LV + BFR (inflated to 140 mmHg) sessions in a repeated-measures randomized crossover design, with a 1-week interval separating the sessions. The results indicated that the electromyography values from the rectus femoris during LV + BFR were greater than those during LV (p < 0.05). LV + BFR caused a minor increase in the lactate (LA) response (p < 0.05); LV with or without BFR failed to elicit change in growth hormone (GH) and testosterone (T) levels (p > 0.05). Cortisol (C) levels were decreased postexercise in both the sessions (p < 0.05). In conclusion, BFR elicited higher increase in muscle activity and metabolic response, but it did not induce hormonal responses. The exposure of LV and LV + BFR may only have a relief effect as detected by the reduction in C levels, probably because the LV did not elicit sufficient stimulus to the muscles.
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Chen et al. (2018) studied this question.
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