Journal of Exercise & Organ Cross Talk

Abstract This study investigated the effects of 4-week Zingiber officinale (ginger) supplementation (1 g/day) on serum lactate dehydrogenase (LDH) dynamics and fatigue perception in obese women (BMI >30 kg/m²; n=50) following acute eccentric and concentric exercise. Participants were stratified by VO₂max and allocated to: ginger+eccentric (G+E), ginger+concentric (G+C), placebo+eccentric (P+E), placebo+concentric (P+C), or control (no intervention). Following supplementation, participants completed treadmill-based eccentric (-10% to -15% incline) or concentric (+10% to +15% incline) protocols to volitional exhaustion. Fasted venous blood samples quantified serum LDH; fatigue was assessed via Fatigue Severity Scale (FSS). ANCOVA with baseline adjustment revealed: Significant LDH elevation post-exercise (η²=0.62, P<0.001), with eccentric > concentric (Δ28.3±6.2 vs. Δ18.5±5.9 U/L; P=0.008). Ginger attenuated LDH vs. placebo (mean reduction: -21.8 U/L, 95% CI: -30.1 to -13.5; P<0.001, η²=0.42), particularly after eccentric exercise (G+E vs. P+E: -24.7 U/L, P=0.002). Non-significant FSS increase overall (η²=0.09, P=0.12), though ginger reduced FSS elevation by 41% vs. placebo (Δ8.7±3.9 vs. Δ14.8±5.2; P=0.07), with strongest attenuation in G+E (-9.3 units; P=0.052). Four-week ginger supplementation significantly mitigates exercise-induced LDH release in obese women, indicating cytoprotective effects against muscular stress. While fatigue modulation was statistically non-significant, clinically relevant attenuation trends suggest potential ergogenic benefits requiring further investigation.

Abstract Skeletal muscle functions as an endocrine organ by releasing myokines—cytokines and peptides that mediate systemic physiological adaptations. This review synthesizes evidence establishing mechanical stretching (active/passive) as a potent mechanotransductive stimulus for myokine secretion. Key pathways include integrin-mediated signaling, stretch-activated ion channels (Piezo/TRP), and mechanosensitive transcriptional regulators (YAP/TAZ), which activate MAPK, calcium-dependent kinases, and other cascades to modulate myokine gene expression. We highlight stretch-responsive myokines (IL-6, irisin, myostatin, BDNF, SPARC) and their roles in metabolism, tissue repair, and inflammation. Clinical implications for aging, metabolic disease, and rehabilitation are discussed, emphasizing how targeted stretching protocols may harness myokine-mediated benefits in mobility-limited populations. Future research directions include optimizing stretch "dosing" and elucidating tissue-specific myokine actions.