Dr Andrew Garrett from Sport, Health+Exercise Science and the Postgraduate Research Director in the Faculty of Health Science has just presented his work at the 7th International Conference of Physiology and Pharamcology in Split, Croatia.
This work investigated the ‘Physiological and performance differences in the follicular and luteal menstrual phases of moderately-trained females during intermittent exercise in the heat’. This project has been funded by the Joel Havelange Research Scholarship awarded from FIFA.
Abstract:
Physiological and performance differences in
the follicular and luteal menstrual phases of moderately-trained females during
intermittent exercise in the heat
Andrew Garrett1*, Jarrod Gritt1, Edward Dodd1,
Victoria Biddlecombe1, Damien Gleadall-Siddall1, Rachel
Burke1, Richard Turpin1, Jake Shaw1, James
Bray1, Huw Jones2 & Grant Abt1.
Sport, Health and Exercise Science, School of Life Science, Faculty of
Health Science, University of Hull, UK1.
School of Mathematics and Physical Science, Faculty of Science and
Engineering, University of Hull, UK2.
*Corresponding author
Introduction: The menstrual cycle plays a key role in athletic
performance but how it affects exercise for trained females in the
heat is unclear. Therefore, the aims of this study were to investigate
physiological and performance differences in the follicular and luteal phases
of moderately-trained females during intermittent exercise in the heat.
Methods: Ten, healthy, active, moderately-trained females (Mean [SD]; age 22.6 [2.7] y; stature 165.3 [6.2] cm; body mass 61.5 [8.7] kg; VO2peak 43.9 [8.6] mL.kg-1.min-1) participated. The heat stress test (HST) (31.0°C; 50% RH) consisted of 9x5min (45-mins) of intermittent exercise based on match-play of female footballers. Completing two HSTs (HST1 and HST2) separated by one week, in the follicular and luteal menstrual phases respectively. Determined by self-reported menstrual cycle questionnaire and plasma 17β-estradiol.
Results: In the follicular (HST1) versus luteal (HST2) menstrual phases there was limited change in resting Tre by 0.05 (95% CI -0.20 to 0.27°C; P = 0.74), end-exercise Tre (0.10; -0.20 to 0.40°C; P=0.47); resting Tsk (-0.45; -1.15 to 0.20°C; P=0.15), end-exercise Tsk (-0.20; -0.95 to 0.60°C; P=0.64); resting Tb (-0.15; -0.30 to 0.05°C; P=0.14), end-exercise Tb (0.05; -0.20 to 0.30°C; P=0.56). Similarly, there was limited change in end-exercise fc (1; -6 to 7 b.min-1; P=0.84); %PV (-3.7; -10.5 to 3.0%; P=0.22) and mean power output (6; -25 to 36 W; P=0.68) in the sprint performance test.
Discussion and conclusion: This work has demonstrated limited physiological and performance differences in the follicular and luteal menstrual phases of moderately-trained females during intermittent exercise in the heat. This may be due to trained females having less bi-phasic fluctuations in steroidal hormones that may attenuate the differences in the effector responses of cutaneous vasodilation during heat stress.
Methods: Ten, healthy, active, moderately-trained females (Mean [SD]; age 22.6 [2.7] y; stature 165.3 [6.2] cm; body mass 61.5 [8.7] kg; VO2peak 43.9 [8.6] mL.kg-1.min-1) participated. The heat stress test (HST) (31.0°C; 50% RH) consisted of 9x5min (45-mins) of intermittent exercise based on match-play of female footballers. Completing two HSTs (HST1 and HST2) separated by one week, in the follicular and luteal menstrual phases respectively. Determined by self-reported menstrual cycle questionnaire and plasma 17β-estradiol.
Results: In the follicular (HST1) versus luteal (HST2) menstrual phases there was limited change in resting Tre by 0.05 (95% CI -0.20 to 0.27°C; P = 0.74), end-exercise Tre (0.10; -0.20 to 0.40°C; P=0.47); resting Tsk (-0.45; -1.15 to 0.20°C; P=0.15), end-exercise Tsk (-0.20; -0.95 to 0.60°C; P=0.64); resting Tb (-0.15; -0.30 to 0.05°C; P=0.14), end-exercise Tb (0.05; -0.20 to 0.30°C; P=0.56). Similarly, there was limited change in end-exercise fc (1; -6 to 7 b.min-1; P=0.84); %PV (-3.7; -10.5 to 3.0%; P=0.22) and mean power output (6; -25 to 36 W; P=0.68) in the sprint performance test.
Discussion and conclusion: This work has demonstrated limited physiological and performance differences in the follicular and luteal menstrual phases of moderately-trained females during intermittent exercise in the heat. This may be due to trained females having less bi-phasic fluctuations in steroidal hormones that may attenuate the differences in the effector responses of cutaneous vasodilation during heat stress.
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