This randomized controlled trial investigates whether slow breathing techniques influence heart rate variability, exercise self-efficacy, and resistance exercise performance in women with fibromyalgia. Participants will be randomly assigned to one of three breathing conditions (slow breathing with visual pacer, slow breathing without pacer, or spontaneous breathing) before performing a biceps curl resistance exercise. The study will examine how breathing patterns interact with psychological variables (anxiety sensitivity, pain catastrophizing, pain hypervigilance, and kinesiophobia) to affect physiological and performance outcomes.
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Heart Rate Variability (HRV) - Change from Baseline
Timeframe: Measured: 5 min baseline, 8 min during breathing intervention, and 5 min post-exercise recovery.
Number of Biceps Curl Repetitions
Timeframe: Immediately during the resistance exercise test (single session).