Impact of using supplemented thylakoids derived from spinach for 12 weeks of high-intensity functional training on adipo-myokines in obese males

Objective

This randomized controlled study investigated the independent and combined effects of High-Intensity Functional Training (HIFT) and spinach-derived thylakoid supplementation on adipo-myokines, glycemic control, and lipid profiles in obese males. To compare the effects of HIFT alone, thylakoid supplementation (Thyl) alone, and their combination (HIFT+Thyl) on circulating adipokines (CTRP-2, CTRP-9, GDF-8, GDF-15), insulin resistance, and lipid profiles in obese adult males.

Methods

A total of 68 participants who were obese with BMI: 32.6 ± 2.6 kg/m2 were randomly assigned to four groups ( n = 17 in each group): thylakoid supplementation (Thyl), HIFT + Placebo High-Intensity Functional Training (HIFT), HIFT + thylakoid supplementation (HIFT+Thyl), and control+Placebo group (C). The training groups (HIFT and HIFT+Thyl) completed a 12-week program of three 60-min sessions per week. Participants in the Thyl and HIFT+Thyl groups dissolved and consumed 5 g/day of spinach extract high in thylakoids (or placebo) for 12 weeks. Baseline and post-intervention measurements included circulating C1Q/TNF or TGF- β related proteins (CTRP-2, CTRP-9, GDF-8, GDF-15), insulin resistance (HOMA-IR, plasma glucose, and insulin), lipid profile (HDL-C, LDL-C, triglycerides [TG], total cholesterol [TC]), and body composition (BMI, fat mass [FM], and fat-free mass [FFM]). Randomization was performed using a block randomization method with allocation concealment.

Results

There were significant group × time interactions for all variables (all p < 0.001): CTRP-9 ( η 2 = 0.6), CTRP-2 ( η 2 = 0.7), GDF-8 ( η 2 = 0.8), GDF-15 ( η 2 = 0.4), BMI ( η 2 = 0.45), FM ( η 2 = 0.42), HDL-C ( η 2 = 0.37), LDL-C ( η 2 = 0.34), TC ( η 2 = 0.46), TG ( η 2 = 0.66), insulin ( η 2 = 0.78), glucose ( η 2 = 0.5), and HOMA-IR ( η 2 = 0.7). Compared with baseline, all interventions (HIFT, Thyl, and HIFT+Thyl) significantly decreased adipokine levels (CTRP-9, CTRP-2, GDF-8, GDF-15), BMI, fat mass, LDL-C, TC, TG, insulin, glucose, and HOMA-IR, while increasing HDL-C (all p < 0.05). Post-hoc between-group comparisons showed that HIFT+Thyl resulted in significantly greater improvements in all adipo-myokines, lipid profile, glycemic and insulin control, and body fat compared to Thyl alone (all p < 0.05). HIFT and HIFT+Thyl showed comparable reductions in BMI, fat mass, and improvements in lipid profile and insulin sensitivity.

Conclusion

These findings indicate that HIFT combined with spinach-derived thylakoid supplementation significantly decreases circulating adipo-myokines and improves insulin resistance and lipid profiles in obese adults, suggesting a promising lifestyle intervention for obesity management and cardiometabolic disease prevention. Further research is warranted to explore long-term effects and underlying mechanisms.

Clinical Trial Registration

https://irct.behdasht.gov.ir/trial/69048 , identifier (IRCT20151228025732N77).