Fig. 2

Associations between maximum working capacity (Wattmax), peak oxygen uptake (VO2peak), oxygen uptake at the anaerobic threshold (VO2@AT), peak oxygen pulse (peak O2 pulse) and ventilatory efficiency (VE/VCO2 slope) and individual taxa. The heatmap displays the positive (red) or inverse (blue) associations of the different cardiopulmonary exercise testing (CPET) parameters Wattmax, VO2peak, VO2@AT, peak O2 pulse and VE/VCO2 slope with individual genera or families. Only taxa with at least one significant association result to any of the CPET variables are shown. *Indicates significant results (q < 0.05). (f): Family. Statistical significance was assessed using a negative binomial regression model.