Strength Increases Do Not Correlate To Delta Changes In Lean Soft Tissue

Abstract

Listen

Translate article

Strength training results in increased lean soft tissue and maximal strength. However, the relationship between lean soft tissue (LST) and pre- and post-training maximal strength, and Delta changes in LST and Delta changes in strength due to resistance training are less clear. PURPOSE To determine the correlations between total and regional LST and maximal strength both pre- and post-training, and Delta changes in total body and regional LST and maximal strength caused by resistance training in women. METHODS Twelve experienced women resistance trainers (41.9 ± 1.6 yrs) performed a total body resistance training program using adjustable variable cam resistance training machines 3 days per week for 12 weeks. Each training session included 3 sets of 10 repetitions of each of 11 exercises and 20 minutes of aerobic training at a minimal of 60% of each subject's age predicted maximal heart rate. One repetition maximal weights (1 RM) and total body and regional LST were determined using dual-energy X-ray absorptometry pre- and post-training. Dependant-t tests were used to determine pre- to post-training differences in variables. Pearson product moment correlations were calculated between absolute 1 RM and absolute LST measures pre- and post-training and between Delta changes in these same variables. RESULTS 1 RM significantly increased (25–30%) in all exercises (bench press, leg press, lat pull-down, overhead press) tested. Total body, arm, trunk and total upper body (arm + trunk) LST also significantly increased (2.2 – 4.5%). While leg LST showed a small, but not significant change. Generally pre and post of training significant correlations were demonstrated between total body and regional LST and the 1 RM of all exercises tested (r = 0.58–0.90) except for the leg press. While generally non significant correlations were shown between Delta changes in 1 RM and Delta changes in total and regional LST except for the bench press (r = 0.64–0.76). CONCLUSIONS The lack of significant correlations between Delta changes in LST and Delta changes in maximal strength indicate factors other than LST changes in part account for maximal strength changes caused by resistance training. Supported by Strive Fitness Inc.