performance human 18 Article 15 Humans 12 male 11 controlled study 8 female 8 Performance 7 reproducibility 7 Male 6 Reproducibility of Results 6 adult 6 machine learning 6 Deep learning 5 accuracy 5 convolutional neural network 5 deep learning 5 nonhuman 5 Female 4 training 4 Adult 3 COVID-19 3 SARS-CoV-2 3 Young Adult 3 article 3 artificial intelligence 3 athletes 3 cycling 3 diagnostic test accuracy study 3 heart rate variability 3