Abstract
To examine efficacy of 12months Football Fitness offered twice per week on bone mineral density (BMD), bone turnover markers (BTM), postural balance, muscle strength, and body composition in women treated for early-stage breast cancer (BC). Women treated for early-stage BC were randomized to Football Fitness (FFG, n=46) or control (CON, n=22) in a 2:1 ratio for 12months, with assessments performed at baseline, 6months and 12months. Outcomes were total body-, lumbar spine- and proximal femur BMD, total body lean and fat mass, leg muscle strength, postural balance, and plasma amino-terminal propeptide of type 1 procollagen (P1NP), osteocalcin, and C-terminal telopeptide of type 1 collagen (CTX). Intention-to-treat (ITT) analyses and per-protocol analyses (≥50% attendance in FFG) were performed using linear mixed models. Participants in FFG completing the 12-month intervention (n=33) attended 0.8 (SD=0.4) sessions per week. Intention to treat analysis of mean changes over 12months showed significant differences (p<.05) in L1-L4 BMD (0.029g/cm2 , 95%CI: 0.001 to 0.057), leg press strength (7.2kg, 95%CI: 0.1 to 14.3), and postural balance (-4.3 n need of support, 95%CI: -8.0 to -0.7) favoring FFG compared to CON. In the per-protocol analyses, L1-L4 and trochanter major BMD were improved (p=.012 and .030, respectively) in FFG compared with CON. No differences were observed between groups in BTMs in the ITT or per protocol analyses. One year of Football Fitness training may improve L1-L4 BMD, leg muscle strength, and postural balance in women treated for early-stage breast cancer.
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