A study on the prevalence of muscle imbalance between hamstrings and quadriceps among weight trainers of Slimmer's World in Roxas Boulevard, Manila

Date of Completion

2000

Document Type

Thesis

Degree Name

Bachelor of Science in Physical Therapy

Keywords

Muscle Strength, Resistance Training

Abstract

Hamstring strength be at least the strength of quadriceps for appropriate knee biomechanics. Knowledge of the relationship between the strength of two muscles is significant if one aim is injury-prevention. A study was conducted to determine the prevalence of muscle imbalance between hamstrings and quadriceps among the 40 weight trainers of Slimmers World, Roxas Boulevard, Manila. Data elicited from the questionnaires during the three visits were on demographic information as to sex, age, and number of years of training. The subject should be a regular weight trainer who undergone resistance training for at least six weeks, does not have pain or musculoskeletal injuries on the lower extremity, uncontrolled hypertension, and heart ailment. 70% of the weight trainers subjected to the study were in the young adulthood. Male subjects account for more than half (62.5%) of the sample population. Majority of the subjects have been undergoing weight training of the quadriceps and hamstrings for 1 year to less than 2 years. Thirty percent has only less than one year of weight training experience while 7.5 percent has been undergoing weight training for 7 years. 20% of the total sample population was found to have muscle imbalances. Of all the subjects with muscle imbalances (8 subjects), 75% has muscle imbalance on both legs while 25% has muscle imbalance only on the right leg. 5 weight trainers were in the young adulthood and account for 62%, 2 subjects (25%) were in the late adolescence, and only 1 subject (13%) in the middle adulthood, 7 male subjects constitute 87.5% and only one female accounts for 12.5%. All of the weight trainers with more than 5 years of training were found to have muscle imbalance and constitute 37.5%. 12.5 of all the subjects with muscle imbalance has been training for less than a year. 25% has been training for 1 to less than 2 years while the other 25% for 2 to less than 3 years. It can be noted that the longer the years of training of the subjects, the higher the frequency of muscle imbalance. We recommend for future researchers to conduct further study along this line about the most frequently trained muscle group and used exercise program among the weight trainers.

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