Lower body positive pressure treadmills (LBPPTs) as a strategy to reduce musculoskeletal load are becoming more common as part of sports conditioning, although the requisite physiological parameters are unclear. To elucidate their role, ten well-trained runners (30.2 ± 3.4 years; VO_2max: 60.3 ± 4.2 mL kg⁻¹ min⁻¹) ran at 70% of their individual velocity at VO_2max (vVO_2max) on a LBPPT at 80% body weight support (80% BW_Set) and 90% body weight support (90% BW_Set), at 0%, 2% and 7% incline. Oxygen consumption (VO₂), heart rate (HR) and blood lactate accumulation (LA) were monitored. It was found that an increase in incline led to increased VO₂ values of 6.8 ± 0.8 mL kg⁻¹ min⁻¹ (0% vs. 7%, p < 0.001) and 5.4 ± 0.8 mL kg⁻¹ min⁻¹ (2% vs. 7%, p < 0.001). Between 80% BW_Set and 90% BW_Set, there were VO₂ differences of 3.3 ± 0.2 mL kg⁻¹ min⁻¹ (p < 0.001). HR increased with incline by 12 ± 2 bpm (0% vs. 7%, p < 0.05) and 10 ± 2 bpm (2% vs. 7%, p < 0.05). From 80% BW_Set to 90% BW_Set, HR increases of 6 ± 1 bpm (p < 0.001) were observed. Additionally, LA values showed differences of 0.10 ± 0.02 mmol l⁻¹ between 80% BW_Set and 90% BW_Set. Those results suggest that on a LBPPT, a 2% incline (at 70% vVO_2max) is not yet sufficient to produce significant physiological changes in VO₂, HR and LA—as opposed to running on conventional treadmills, where significant changes are measured. However, a 7% incline increases VO₂ and HR significantly. Bringing together physiological and biomechanical factors from previous studies into this practical context, it appears that a 7% incline (at 80% BW_Set) may be used to keep VO₂ and HR load unchanged as compared to unsupported running, while biomechanical stress is substantially reduced.

中文翻译：

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上坡跑步对下身正压跑步机上的VO2，心率和乳酸积累的影​​响

下体正压跑步机（LBPPTs）作为减少肌肉骨骼负荷的一种策略，已成为体育锻炼的一部分，尽管尚不清楚必需的生理参数。为了阐明其作用，十位训练有素的跑步者（30.2±3.4岁； VO _2max：60.3±4.2 mL kg ^-1 min ^-1）以80％LBPPT上VO _2max（vVO _2max）的个人速度的70％奔跑在0％，2％和7％倾斜时，％体重支持（80％BW_设定）和90％体重支持（90％BW_设定）。耗氧量（VO ₂），监测心率（HR）和血液乳酸累积（LA）。发现倾斜度的增加导致VO ₂值增加，分别为6.8±0.8 mL kg ^-1 min ^-1（0％vs. 7％，p <0.001）和5.4±0.8 mL kg ^-1 min ^-1（2 ％vs. 7％，p <0.001）。在80％BW_设定值和90％BW_{设定值之间}，VO ₂差异为3.3±0.2 mL kg ^-1 min ^-1（p <0.001）。HR随斜率增加12±2 bpm（0％对7％，p <0.05）和10±2 bpm（2％对7％，p <0.05）。从80％体重_设置为BW _Set的90％，观察到HR升高6±1 bpm（p <0.001）。另外，LA值显示80％BW _Set和90％BW _Set之间的差异为0.10±0.02 mmol l ^-1。这些结果表明，在LBPPT上，倾斜2％（在vVO _2max为70％时）尚不足以在VO ₂，HR和LA中产生显着的生理变化，这与在常规跑步机上进行测量的情况相反，在传统的跑步机上测量该变化。但是，7％的倾斜会显着增加VO ₂和HR。将以前的研究中的生理和生物力学因素综合到这种实际情况中，似乎有7％的倾斜（体重80％时）_设定）可以使VO ₂和HR负载与不受支持的运行相比保持不变，同时生物力学应力得到显着降低。