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ABSTRACT: We examined the effects of one dose of a multi-vitamin with Relora®, a proprietary blend of Magnolia officinalis and Phellodendron amurense bark extracts, designed for nighttime (MVE; containing 200mg Relora), multi-vitamin (MV, 0mg of Relora), or a placebo (P) on subjective sleep quality and sleep quantity the night before an endurance cycling event. Sixty-six recreational athletes (age, 51±11 yr; body fat, 22±8%) completed an 80-164 km sanctioned road cycling event. Prior to the event, subjects reported habitual and previous night's sleep times, latency, and overall sleep quality, and then were randomized and blinded into supplementation groups (MVE, MV, or P). The night before the event, athletes consumed one serving of their supplement and then met with researchers in the morning before the event start. Between groups, there were no differences in athlete demographics, event distance, habitual sleep quality (4.4±1, 4.3±1.3, 4.6±0.9, respectively) or sleep latency (15±14, 24±37, 19±16 min, respectively) (p>0.05). Athletes consuming the MVE fell asleep 28 min faster than P athletes (29±12 vs. 57±59 min, p=0.05). Moreover, the night before the event, athletes not taking the MVE ranked sleep quality worse than habitual sleep (MV: 3.8±1.4, P: 3.5±1.1; p<0.05), while the MVE athletes' sleep rank (3.9±1.1) was not worse. Athletes with an early next day event may experience improved sleep quality and quantity with no perceived effects on readiness with an acute supplementation of the MVE.
KEY WORDS: Dietary supplement, Exercise, Magnolia officinalis, Phellodendron amurense
INTRODUCTION
Disrupted sleep, less than normal sleep, or a shift in sleeping hours are all common situations athletes experience the night before an event with an early start and these sleep disturbances can affect physiological and cognitive functions (Halson, 2014). Sleep is important for almost all biological functions regarding physiological processes (Cirelli et al., 2008), cognitive performance and mood (Belenky et al., 2003), and exercise recovery (Reilly et al., 2007). Acute sleep loss of as little as 80 minutes in one night can result in a reduction of daytime alertness by as much as 32% (Bonnet et al., 1995). However, sleep deprivation of more than a whole day (30+ hours) has very little effect on pacing, cardiorespiratory measures and thermoregulatory function (Oliver et al., 2009) compared to nights of normal sleep, suggesting sleep loss might...