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LBNP exercise protects aerobic capacity and sprint speed of female twins during 30 days of bed rest

机译:LBNP运动可在卧床休息30天期间保护女性双胞胎的有氧运动能力和冲刺速度

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摘要

We have shown previously that treadmill exercise within lower body negative pressure (LBNPex) maintains upright exercise capacity (peak oxygen consumption, V̇o2peak) in men after 5, 15, and 30 days of bed rest (BR). We hypothesized that LBNPex protects treadmill V̇o2peak and sprint speed in women during a 30-day BR. Seven sets of female monozygous twins volunteered to participate. Within each twin set, one was randomly assigned to a control group (Con) and performed no countermeasures, and the other was assigned to an exercise group (Ex) and performed a 40-min interval (40–80% pre-BR V̇o2peak) LBNPex (51 ± 5 mmHg) protocol, plus 5 min of static LBNP, 6 days per week. Before and immediately after BR, subjects completed a 30.5-m sprint test and an upright graded treadmill test to volitional fatigue. These results in women were compared with previously reported reductions in V̇o2peak and sprint speed in male twins after BR. In women, sprint speed (−8 ± 2%) and V̇o2peak (−6 ± 2%) were not different after BR in the Ex group. In contrast, both sprint speed (−24 ± 5%) and V̇o2peak (−16 ± 3%) were significantly less after BR in the Con group. The effect of BR on sprint speed and V̇o2peak after BR was not different between women and men. We conclude that treadmill exercise within LBNP protects against BR-induced reductions in V̇o2peak and sprint speed in women and should prove effective during long-duration spaceflight.
机译:我们先前已经证明,在卧床休息(BR)5天,15天和30天后,在下身负压(LBNPex)内的跑步机运动可保持男性的直立运动能力(峰值耗氧量,V̇o2peak)。我们假设LBNPex在30天的BR中可以保护跑步机的V̇o2peak和冲刺速度。七组女性单卵双胞胎自愿参加。在每个双胞胎组中,一个被随机分配到对照组(Con),不执行任何对策,另一个被分配到运动组(Ex),并执行40分钟的间隔(BRV̇o2peak之前为40–80%) LBNPex(51±5 mmHg)方案,加上5分钟的静态LBNP,每周6天。在发生BR之前和之后,受试者完成了30.5米的冲刺测试和立式渐变跑步机测试,以评估其疲劳程度。将女性的这些结果与先前报道的BR后男性双胞胎的Voopeak和冲刺速度降低进行了比较。在女性中,Ex组的BR后,冲刺速度(-8±2%)和V̇opeak(-6±2%)没有差异。相比之下,Con组的BR后,冲刺速度(−24±5%)和V̇opeak(−16±3%)均显着降低。男女对BR对冲刺速度和V̇o2peak的影响无差异。我们得出的结论是,LBNP内的跑步机运动可防止BR引起的女性V̇o2peak和冲刺速度的降低,并且在长时间航天中应证明是有效的。

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