Table 1.

Individual biological response to the different training session types.

	FGF21			Follistatin			Myostatin			IL-15			Irisin			Ghrelin			PYY
Subject	HIIT1	HIIT2	RT	HIIT1	HIIT2	RT	HIIT1	HIIT2	RT	HIIT1	HIIT2	RT	HIIT1	HIIT2	RT	HIIT1	HIIT2	RT	HIIT1	HIIT2	RT
1		+	+	+	+	+	+	+	+	+	+		+			+			+	+	+
2				+	+	+		+	+	NA	NA	NA	+						+	+
3			+	+	+	+		+	+	NA	NA	NA						+	+	+	+
4				+	+	+			+	NA	NA	NA				+			+	+	+
5							+			NA	NA	NA							+	+	+
6	+		+	+	+				+	NA	NA	NA				+		+	+	+	+
7	+			+			+	+		+				+		+			+	+
8					+	+		+	+		+		+				+		+	+
9		+			+	+	+	+	+			+					+		+		+
10			+		+	+		+		+		+	+		+				+	+
11			+		+				+		+	+								+	+
12			+	+	+				+							+			+	+	+
13	+	+		+	+			+	+	+	+	+		+	+			+	+	+	+
14			+	+	+		+	+	+					+		+	+		NA	NA	NA
15				+	+		+		+	NA	NA	NA					+		NA	NA	NA
16		+	+	+	+		+			NA	NA	NA			+		+	+	NA	NA	NA
17		+	+		+			+		NA	NA	NA		+	+	+		+	+	+	+

Responsiveness (indicated as “+”) was determined as a positive change greater than the smallest worthwhile change (calculated for each cytokine as twice the typical error of measurement and expressed as a percentage). Abbreviations: FGF21, fibroblast growth factor; HIIT1, high intensity interval training session with short intervals; HIIT2, high intensity interval training session with long intervals; IL-15, interleukin-15; N/A, not available; PYY, peptide YY; RT, resistance training.