Although there are numerous studies showing effects of aerobic training on sex hormone concentrations, research analyzing the fluctuation of sex hormones in response to resistance training (RT) is lacking. The objective of this project is to analyze estradiol (E2) and progesterone (P4) responses to an acute resistance training session throughout different phases of the menstrual cycle. This proposed research has strong implications for exercise prescription and for women in general, but more importantly will allow exercise physiologists, coaches, personal trainers, or nutritionists optimize exercise programming around women's menstrual cycle.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
25
Participants will exercise at the mid-point of each menstrual cycle phase (EFP- day 4, LFP- day 11, ELP- day 18 and LLP- day 25 for a 28 day menstrual cycle). Training will consist of a warm up. Intensity will be set at 70% of 1RM, and the circuit training will include 7 strength exercises: leg press, rows, back squat, weighted crunches, deadlifts, bench press, and weighted squat jumps. The participant will perform 3 sets f 10 repetitions with 30 seconds of rest
Southern Illinois University Edwardsville
Edwardsville, Illinois, United States
RECRUITINGChange in estrogen concentrations
Estrogen concentrations will be obtained from blood samples assessed using through ELISA kits
Time frame: through study completion, an average of 5 weeks
Change in progesterone concentrations
Progesterone concentrations will be obtained from blood samples assessed using through ELISA kits
Time frame: through study completion, an average of 5 weeks
Lean body mass (kg)
Lean body mass (kg) will be assessed through Dual-energy X-ray Absorptiometry
Time frame: At baseline: 1 assessment point
Fat mass (kg)
Fat mass (kg) will be assessed through Dual-energy X-ray Absorptiometry
Time frame: At baseline: 1 assessment point
Relative body fat (%)
Relative body fat (%) will be assessed through Dual-energy X-ray Absorptiometry
Time frame: At baseline: 1 assessment point
Skeletal muscle mass (kg)
Skeletal muscle mass (kg) will be estimated using Dual-energy X-ray Absorptiometry values
Time frame: At baseline: 1 assessment point
Cardiorespiratory Fitness
Cardiorespiratory Fitness will be assessed with a cardiopulmonary exercise test using the Bruce protocol
Time frame: At baseline: 1 assessment point
Strength in Bench Press
Maximal strength bench press will be assessed using one repetition maximum test
Time frame: At baseline: 1 assessment point
Strength in Leg Press
Maximal strength in leg press will be assessed using one repetition maximum test
Time frame: At baseline: 1 assessment point
Changes in diet
Diet will be assessed using the a 24h dietary recall
Time frame: through study completion, an average of 5 weeks
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