MAXIMAL VO2 AT EXTREME ENDS OF THE DAY FOLLOWING GLUCOSE PROVISION

Authors

JL Carducci
MJ Garver
WJ Stone
M Penumetcha
DW Davis
AR McMillin
JN Hair
NM Philipp
JR Elledge
EB Sheck
KM Scherry

Abstract

Jenna L. Carducci¹, Matthew J. Garver¹, Whitley J. Stone¹, Meera Penumetcha¹, Dustin W. Davis¹, Adam R. McMillin¹, Josie N. Hair¹, Nicolas M. Philipp¹, Jordan R. Elledge¹, Emily B. Sheck¹, & Katherine M. Scherry¹

¹University of Central Missouri, Warrensburg, Missouri

Exercise programs are more favorable when individualized to particular needs and preferences. Controlling training and exercise characteristics such as time of day and glucose provision may enhance subsequent performance. PURPOSE: The purpose of this research was to investigate maximal VO₂ at extreme ends of the day following a standardized glucose provision. METHODS: Thirteen participants (Females: 8, Males: 5, Age: 20.7 ± 1.4 yrs., BMI: 24.9 ± 3.0 kg/m²) volunteered to complete two maximal VO₂ tests, one between 06:00-09:00 and the other between 21:00-24:00. A familiarization trial was utilized to mitigate a learning effect and determine the speed that elicited a perceived effort of 12-13 on the Borg 6-20 RPE scale when steady-stated. Considering body mass and activity level, a standardized test meal of approximately 80% carbohydrates, 3% fat, and 17% protein was provided 2 hours prior to testing. For the maximal testing, treadmill speed was maintained at the predetermined intensity, and grade was increased 2% every 2 minutes until volitional fatigue. Maximal VO₂ was determined via a metabolic cart using a 15-breath moving average. RESULTS: The maximal tests lasted 10.13 ± 2.15 minutes. There was no statistical difference (p < .05) found for morning vs. evening tests for maximal VO₂ (47.0 ± 7.0 vs. 47.3 ± 8.0 ml/kg/min). CONCLUSION: The glucose provision prior to exercise was intended to standardize nutrient intake prior to completing the maximal VO₂ tests. The results of this study align with the available literature suggesting that maximal VO₂ does not significantly differ between morning and evening exercise tests. Exercising at extreme ends of the day may not result in a significant difference in maximal VO₂ among a group of younger, recreationally active adults provided a high-glucose test meal.

ACKNOWLEDGEMENTS: This research was funded by the Graduate Student Research Fund from the University of Central Missouri.

Recommended Citation

Carducci, JL; Garver, MJ; Stone, WJ; Penumetcha, M; Davis, DW; McMillin, AR; Hair, JN; Philipp, NM; Elledge, JR; Sheck, EB; and Scherry, KM (2018) "MAXIMAL VO2 AT EXTREME ENDS OF THE DAY FOLLOWING GLUCOSE PROVISION," International Journal of Exercise Science: Conference Proceedings: Vol. 11: Iss. 6, Article 14.
Available at: https://digitalcommons.wku.edu/ijesab/vol11/iss6/14