Bircan Dokumacı1,2, Tahir Hazır3. 1. a Eskisehir Technical University. 2. b Anadolu University. 3. c Hacettepe University.
Abstract
Purpose: This study investigated the effects of the menstrual cycle on running economy (RE). Method: Eleven eumenorrheic female athletes (mean age: 21.18 ± 3.65 years, height: 170.2 ± 6.6 cm, VO2max: 49.25 ± 9.15 mL·kg-1·min-1, and menstrual cycle: 29.8 ± 0.98 days) were tested for anthropometric variables, physiological responses (oxygen consumption [VO2], blood lactate [LA], heart rate [HR], and respiratory exchange ratio [RER]) at rest and while running. The RE was measured at speeds of 75%, 85%, and 95% of the lactate threshold at 3.5 mmol·L-1 during the follicular (FP) and luteal phases (LP) of the menstrual cycle. The RE was evaluated as oxygen consumption (mL·kg·min-1 [O2C_min], mL·kg-1·km-1 [O2C_km]) and caloric unit cost (kcal·kg-1·km-1 [EC]) during both phases. Results: There were no significant differences in body composition or resting physiological measurements between the LP and FP (p > .05). Physiological responses measured during RE tests were similar in both phases (p > .05). The RE measured as O2C_min, O2C_km, and EC was significantly lower during the LP than during the FP (p < .05). The RE defined as O2C_ min significantly increased with speed (p < .05), but RE defined as O2C_km and EC was unaffected by speed increment (p > .05). Conclusions: The RE is better in the LP than the FP and is independent of running speed when RE is evaluated as O2C_km and EC. The menstrual cycle had no effect on body composition and physiological variables measured at rest.
Purpose: This study investigated the effects of the menstrual cycle on running economy (RE). Method: Eleven eumenorrheic female athletes (mean age: 21.18 ± 3.65 years, height: 170.2 ± 6.6 cm, VO2max: 49.25 ± 9.15 mL·kg-1·min-1, and menstrual cycle: 29.8 ± 0.98 days) were tested for anthropometric variables, physiological responses (oxygen consumption [VO2], blood lactate [LA], heart rate [HR], and respiratory exchange ratio [RER]) at rest and while running. The RE was measured at speeds of 75%, 85%, and 95% of the lactate threshold at 3.5 mmol·L-1 during the follicular (FP) and luteal phases (LP) of the menstrual cycle. The RE was evaluated as oxygen consumption (mL·kg·min-1 [O2C_min], mL·kg-1·km-1 [O2C_km]) and caloric unit cost (kcal·kg-1·km-1 [EC]) during both phases. Results: There were no significant differences in body composition or resting physiological measurements between the LP and FP (p > .05). Physiological responses measured during RE tests were similar in both phases (p > .05). The RE measured as O2C_min, O2C_km, and EC was significantly lower during the LP than during the FP (p < .05). The RE defined as O2C_ min significantly increased with speed (p < .05), but RE defined as O2C_km and EC was unaffected by speed increment (p > .05). Conclusions: The RE is better in the LP than the FP and is independent of running speed when RE is evaluated as O2C_km and EC. The menstrual cycle had no effect on body composition and physiological variables measured at rest.
Entities:
Keywords:
Follicular phase; aerobic performance; luteal phase; respiratory exchange ratio
Authors: Mikaeli Anne Carmichael; Rebecca Louise Thomson; Lisa Jane Moran; Thomas Philip Wycherley Journal: Int J Environ Res Public Health Date: 2021-02-09 Impact factor: 4.614
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