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, -la puissance totale (TP, <0,4 Hz) est définie comme la variance de tous les intervalles

, Il a été démontré que lors d'un test d'effort incrémenté, l'altération des indices de la VFC sont différents au repos et à l'effort lors d'un effort modéré en dessous de SV1, les indices de la VFC de ce dernier sont plus élevés que ceux d'un exercice, 2003.

. Lors-d-'un-effort-incrémenté, les paramètres spectraux et temporels de la VFC sont des indices importants pour identifier et repérer le SV1. Parmi ces paramètres spectraux ; l'indice le plus important pour détecter le SV1 est le quotient LF/HF (Cottin &al, 2003.

, Pour les indices temporels, la valeur RMSSD est considérée comme une valeur très importante pour expliquer l'altération de la VFC pendant un effort physique, Elle représente un très bon indice aussi pour repérer le SV1. (Simoes &al, 2013.