Effects of training on muscle strength, quality of life, and body composition in breast cancer survivors
DOI:
https://doi.org/10.47197/retos.v69.112382Keywords:
breast cancer, quality of life, strength, speed of executionAbstract
Introduction: Breast cancer survivors often experience reduced muscle strength and quality of life (QoL) due to chemotherapy.
Objective: This study aimed to evaluate the effects of an 8-week strength training program on muscle strength, QoL, and body composition (BC) in women undergoing chemotherapy for breast cancer.
Methodology: Five participants (50–65 years) completed the program, which included multi-joint exercises for upper and lower limbs. Muscle strength was assessed via one-repetition maximum (1RM) tests (bench press, leg press), handgrip dynamometry, and back-leg-chest dynamometry. QoL was measured using the EORTC QLQ-C30 and BR23 questionnaires, while BC was evaluated via bioimpedance, weight, and waist-hip ratio. Intra-day and intra-evaluator reliability were analyzed.
Results: Significant improvements were observed in muscle strength: bench press 1RM (+3.91 kg), handgrip (left: +2.2 kg; right: +2.4 kg), and back-leg-chest strength (+45 kg). BC showed minimal changes (BMI range: 0.20–1.80; waist-hip ratio: 0.20–0.50). QoL improved globally (EORTC-C30: +10% health status, +3.7% functional domain, −4% symptoms), though the BR23 reported increased symptoms (+10.8%).
Conclusions: The 8-week program enhanced muscle strength and perceived QoL in breast cancer survivors during chemotherapy, without significant BC alterations. These findings support strength training as a complementary therapy, though longer interventions may be needed for BC improvements.
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Copyright (c) 2025 Ivana Leao Ribeiro, Gabriel Vásquez Herrera, Gabriel Vásquez Herrera, Maria Ignacia Lara Alvear, Lily Berrios-Contreras, Alejandra Luz Lorca, Sergio Sazo Rodríguez
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