THE RELATIONSHIP BETWEEN CHRONOTYPE AND VO2MAX, FAT OXIDATION, AND RPE DURING EXERCISE AT EXTREME ENDS OF THE DAY
Carducci, Jenna L.
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The purpose of this research was to evaluate the relationship between chronotype and maximal VO2, fat oxidation, and RPE during exercise at extreme ends of the day. Thirteen subjects completed two VO2max tests, one in the morning (between 06:00-09:00) and one in the evening (between 21:00-24:00). Maximal VO2, fat oxidation (reflected by RER), and RPE values (Borg 6-20), were determined. Chronotype was determined by the Morningness-Eveningness Questionnaire (MEQ) The intent was to compare variables by chronotype. A lack of recruitment of evening-types limited the ability to compare chronotypes, so variables were compared between morning and evening sessions only. There were no significant differences (p<.05) found between morning and evening sessions for maximal VO2 (47.0 ± 7.0 vs. 47.3 ± 8.0 ml/kg/min), maximal fat oxidation (24.8 ±16.7 vs. 27.7 ± 22.3 Kcal), or maximal RPE (18.9 ± 1.1 vs. 18.8 ± 1.5). Exercising at extreme ends of the day may not result in a significant difference of VO2max, fat oxidation, and/or maximal RPE among a group of mixed gender cohort recreationally, active adults.