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Table 3 Basal hormone levels

From: Hormonal aspects of overtraining syndrome: a systematic review

Hormone Quantity of studies Normal levels Reduced levels Increased levels
ACTH 7 (41.2%) 5 (71.4%) - 2 (28.6%)
Cortisol 6 (35.3%) 4 (66.7%) 1 (16.1%) 1 (16.1%)
GH 5 (29.4%) 3 (60.0%) 1 (20.0%) 1 (20.0%)
NUC 4 (23.5%) 3 (75.0%) 1 (25.0%) -
IGF-1 2 (11.8%) 2 (100%) - -
Total T 2 (11.8%) 1 (50.0%) 1 (50.0%) -
Plasma Catecholamines 2 (11.8%) 1 (50.0%) - 1 (50.0%)
Prolactin 2 (11.8%) 2 (100%) - -
T/C ratio 2 (11.8%) 2 (100%) - -
Insulin 1 1 - -
SHBG 1 - - 1
Aldosterone 1 1 - -
T/SHBG 1 1 - -
Free T 1 1 - -
IGFBP-3 1 - 1 -
IGF-1/IGFBP-3 1 - - 1
Peptide F 1 1 - -
4 PM salivary C 1 - - 1
  1. NUC Nocturnal urinary catecholamines, T/C testosterone/cortisol ratio, T/SHBG testosterone/sex hormone binding globulin; salivary C salivary cortisol, 4 PM salivary C salivary cortisol collcted at 4 PM, IGF-1/IGFBP-3 IGF-1/IGFBP3 ratio