Effects of Forearm Resistance Exercises on Breast Cancer-Related Lymphedema Using Segmental Bioelectrical Impedance Analysis: A Pilot Randomized Controlled Trial

<b>Background</b>: Breast cancer-related lymphedema (BCRL) reduces the quality of life of patients and limits their activities of daily living. Even though resistance exercises seemed to be safe in BCRL patients, it was still controversial that resistance exercises improve lymphedema. Therefore, we sought to evaluate the effects of forearm-targeted resistance exercises on BCRL using segmental bioelectrical impedance analysis (BIA). <b>Methods</b>: This study was a pilot-controlled randomized trial, with patients divided into the intervention and the control group. Both groups received 30 min of complete decongestive therapy (CDT) for 2 weeks. In addition, the intervention group received forearm strengthening training including warm-up and cool-down for an extra 20 min, and the control group received stretching exercises. 5 kHz impedance ratios were assessed by segmental BIA before and after treatments. <b>Results</b>: Among the eighteen patients enrolled, ten were assigned to the intervention group, and eight were in the control group. Only the 5 kHz impedance ratio in the forearm segment of the intervention group showed a statistically significant difference. The effect sizes of the groups were 0.71 for the intervention group and 0.93 in the between-group comparison. <b>Conclusions</b>: Forearm resistance exercises in patients with BCRL showed a significant decrease in extracellular fluid in the proximal forearm segment when using segmental BIA. Therefore, we suggest that resistance exercises targeting the forearm might be effective in treating lymphedema.