The Influence of Oral Contraceptives During Disuse

Inclusion criteria

• Right handed males and females
• Ages 18-35 years
• For females, consistent use of monophasic oral contraceptives for the previous 6 months OR having completely refrained from contraceptives for the previous 6 months.

Exclusion criteria

• Gender identity inconsistent with biological sex (due to the influence that drugs used for gender reassignment may have)
• Females that are amenorrheic (lack of menstruation for ≥3 consecutive cycles) or oligomenorrheic (menstrual cycle length ≤36 days)
• Menstrual cycle irregularities among females not using oral contraceptives (regularity defined as every 21 to 35 days and/or at least 5 periods in the last six months)
• Any contraceptive use other than monophasic oral contraceptives within the last 6 months
• Monophasic oral contraceptives that has been inconsistent over the previous 6 months
• Score of greater than 2/5 on question 9, or a score of greater than 1/5 on question 10 or 11 on the quick Disabilities of the Arm, Shoulder and Hand outcome measure indicating pain/discomfort of the upper extremities (shoulder, elbow, wrist, hand)
• Dominant hand is the left hand
• Body Mass Index less than 18.5 kg/m2 or greater than 29.9 kg/m2
• Current depression or anxiety
• History of musculoskeletal injury, pain, or surgery of the elbow, wrist, or hand
• Unwillingness to avoid upper-body exercise during Phase 1
• Unwillingness to avoid exercise and alcohol 24 hours prior to each testing visit.
• Neuromuscular disease (e.g., Multiple Sclerosis, amyotrophic lateral sclerosis, Parkinson's)
• Metabolic disease (e.g., diabetes, thyroid disorder, metabolic syndrome)
• Personal or family history of blood clots
• Trouble using or controlling muscles
• History of cancer
• History of stroke
• History of heart attack
• History of arthritis
• Allergy to rubbing alcohol
• Lack of transportation to and from the laboratory
• Current or planned pregnancy (within the next three months)
• Implant of any kind
• The use of medications that may increase the risk of blood clots (i.e., corticosteroids such as prednisone, testosterone and anabolic steroids, selective estrogen receptor modulators like tamoxifen, aromatase inhibitors including anastrozole, thalidomide and lenalidomide, erythropoiesis-stimulating agents such as epoetin alfa, antipsychotics like chlorpromazine, antidepressants including paroxetine, various cancer chemotherapies, immune modulating drugs, antivirals such as ritonavir, and tamoxifen).
• The use of creatine monohydrate and beta alanine supplementation within the previous 6 months.
• The use of any medication or supplement that could influence hormone levels within the previous 6 months.