Acute Effect of Heavy Weightlifting on the Pelvic Floor Muscles in Strength-Trained Women: An Experimental Crossover Study

Abstract

ABSTRACT Introduction/Purpose Heavy lifting may produce strain on the pelvic floor muscles (PFM) due to high increases in intra-abdominal pressure, but knowledge of the impact of weightlifting on the PFM is lacking. Therefore, this study aimed to investigate acute effects of heavy weightlifting on the PFM in strength-trained women and whether general strength in whole-body exercises correlated to PFM strength. Methods Forty-seven nulliparous women between 18 and 35 yr who regularly performed weightlifting and were able to lift their own body weight × 1.2 in back squat and 1.5 in deadlift were included in this experimental crossover study. They participated in baseline evaluations (questionnaire/measurements of background characteristics and pelvic floor disorders, one-repetition maximum (1RM) tests in back squat and deadlift) and one test day where they were randomized to start with 60 min of weightlifting (four sets of four repetitions at 75%–85% of 1RM in back squat and deadlift) or seated rest of 60 min. Vaginal pressure measurements of PFM resting pressure, strength, and endurance and surface electromyography measurements of PFM resting activity were performed before/after weightlifting and rest. Results No statistically significant differences were found when comparing the change in PFM resting pressure, strength, endurance, and resting activity after heavy weightlifting and rest. There were no statistically significant correlations between PFM strength and maximum (1RM) or relative strength (1RM/bodyweight) in either back squat or deadlift. Conclusions Our results imply that heavy weightlifting is well tolerated by the PFM in short term among young, nulliparous, and strength-trained women. Strength in whole-body exercises was not correlated to PFM strength.