M. Moen, C. Mater, M. Martin, A. Aschmoneit, R. Ashe, R. Wood, J. McKenzie

Gonzaga University, Spokane, WA

The ability to reduce fatigue and maintain aerobic exercise is a critical element of many sports. PURPOSE: The purpose of this study is to determine whether active or passive rest between bouts of exhaustive exercise result in a greater time to exhaustion following rest from an exhausted state. METHODS: Ergometer performances of moderately active volunteered subjects (age 20-25) will be evaluated in the current study. Each subject will undergo one active and one passive rest intervention day in a randomized order. Both interventions will begin with an initial volitional exhaustion test with resistance beginning at 100 W, increasing by 34.3 W every 3 minutes until volitional exhaustion is reached. Subjects will remain seated on the bike for either passive (no pedaling) or active rest (maintain power output of 49 W at 40-50 rpm) for 5 minutes. After the rest, the end resistance will be added back to the ergometer and participants will return to 60-70 rpm until reaching volitional exhaustion. Metabolics and heart rate (HR) will be recorded throughout the experiment. Blood lactate samples will be taken following the first bout of exercise, during the fifth minute of rest, and at the end of the second bout. Participants will return 48-72 hours after the first day to perform the other rest condition. RESULTS: Dependent t-tests will be utilized to explore mean differences between rest conditions evaluating total work, time to exhaustion, blood lactate, HR, oxygen consumption (VO2), and carbon dioxide production (VCO2). Correlations will determine possible relationships between metabolic variables and total work. In addition, individual performances on trial days “1” and “2” will be evaluated with dependent t-tests to evaluate the presence of a training effect. CONCLUSION: Results of this study will explore the role active and passive rest play in aerobic exercise performance, measured by total work and time to exhaustion. Differences between lactate levels, HR, VO2, and VCO2 during the rest period could explain potential discrepancies between performances in the second exhaustive bout following the rest intervention. This methodology intends to further understand the metabolic and energetic differences between rest conditions and contribute to further discussion on recovery protocols for moderately active individuals.

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