• We monitored triathletes for 8-9 weeks of heavy training, but HRV poorly reflected changes in training load =Too lite time spent in high-intensity zones? • There was a general reduction in muscle power and strength, especially in the plantar flexors • We did not observe low -frequency fatigue, rather the opposite. The plantar flexors responded better to low stimulation frequencies, which could be explained by conversion to a slower muscle phenotype (genotype?) • Lactate threshold speed improved for 6 of 8 athletes (T1 to T2), and these changes positively correlated with the vertical stiffness during hopping (and 20:50 Hz) and negatively with power/force measurements
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