Supine LBNP Exercise Maintains Exercise Capacity in Male Twins during 30-d Bed Rest

Abstract

This exercise countermeasure protocol may help prevent microgravity-induced deconditioning during long-duration space flight.

Short-Duration Resistive Exercise Sustains Neuromuscular Function after Bed Rest

“…Although the current exercise groups showed significant differences versus the controls for sprint time changes after bed rest, there was still a significant increase in sprint time over 15 m in the RE group and 30 m in the RVE group. Sprint speed differences may be a function of study duration as the current project included a 60-d bed rest versus 30 d or less in prior works (18,19,30). Although the data may suggest a greater increase in sprint time in the RVE group than in the RE group, the differences between the two groups did not even approach a trend.…”

“…Another study (12) found that 11 sessions per week of resistive exercise combined with whole-body vibration during 56 d of bed rest restricted loss of peak jump height and power to 10% to 15%, compared with 25% to 30% loss in the inactive control group. Some studies of up to 30-d bed rest have examined sprint time performance (18,19,30). These studies found increased sprint time after bed rest.…”

Hemodynamic responses to simulated weightlessness of 24-h head-down bed rest and KAATSU blood flow restriction

“…Now, the most effective countermeasure regimen appears to be a gravitation-like stress combined with exercises. LBNP combined with treadmill has been shown to be a useful method to prevent orthostatic intolerance after space flight or during bed rest periods, probably through its effect as orthostatic stimulus (Güell et al 1992;Murthy et al 1994;Buckey et al 1996;Lee et al 1997Lee et al , 2007Watenpaugh et al 2000;Schneider et al 2002). It has been reported to maintain sub-maximal exercise responses such as maximal heart rate, respiratory exchange ratio, and ventilation, aerobic fitness and sprint speed, then preventing orthostatic intolerance during bed rest (Lee et al 1997;Watenpaugh et al 2000).…”

Energetics of Muscular Exercise

“…4.9, _ V O 2max was measured at least three days after the end of bed rest, at a time when recovery of cardiovascular function was already taking place (Spaak et al 2005), so that the amplitude of the rapid component of the _ V O 2max decline might have been underestimated, especially when the bed rest duration was short. Only exceptions were the studies by Bringard et al (2010) and Lee et al (2007Lee et al ( , 2009, with measurements carried out on the day of reambulation. The results from these studies, for which the bed rest duration was 35 and 30 days, respectively, compared well with those from other studies, perhaps because there was already a significant impact of the slow component of the _ V O 2max decline, the recovery of which is expected to be slower than that of the rapid cardiovascular component.…”