. 2015 Sep 23;6:260. doi: 10.3389/fphys.2015.00260

Table 2.

Surface EMG root mean square (RMS) activity.

Variables (% sprint 1)	Sprints				ANOVA p-value (partial eta-squared)
	4	8	9	12	Condition	Time	Interaction
RMS vastus lateralis
SL	90.9±9.5^a	85.0±17.0^a	92.4±16.8^c	86.1±17.2^a ^d	0.987	<0.001	0.923
MH	89.2±11.7^a	86.3±11.7^a	94.3±9.4^c	84.9±14.4^a ^d	(0.01)	(0.52)	(0.03)
SH	88.8±11.8^a	83.0±13.1^a	96.1±5.8^c	84.8±6.0^a ^d
RMS rectus femoris
SL	88.8±9.2^a	84.8±9.1^a ^b	98.1±11.7^c	88.1±9.9^a ^d	0.166	<0.001	0.036
MH	96.8±10.2^a	85.5±13.3^a ^b	94.6±14.2^c	84.3±17.0^a ^d	(0.14)	(0.67)	(0.15)
SH	84.1±10.6^a	75.5±9.9^a ^b ¹	91.1±13.7^c	81.8±12.4^a ^d
RMS biceps femoris
SL	92.9±10.4	87.1±13.3^a	94.7±9.0^a	85.1±18.6^a ^b ^d	0.906	<0.001	0.535
MH	98.9±9.2	91.6±9.2^a	90.2±12.9^a	85.4±15.3^a ^b ^d	(0.01)	(0.53)	(0.06)
SH	93.3±9.4	89.2±9.5^a	94.2±11.7^a	85.6±15.5^a ^b ^d
RMS gastrocnemius medialis
SL	93.8±5.9^a	86.2±10.2^a ^b	99.6±9.9^c	91.9±18.2^a ^c ^d	0.336	<0.001	0.553
MH	93.2±11.2^a	82.6±13.9^a ^b	92.4±12.9^c	84.5±18.9^a ^c ^d	(0.09)	(0.61)	(0.06)
SH	90.3±9.7^a	81.9±8.4^a ^b	95.7±9.5^c	91.5±11.6^a ^c ^d
RMS gastrocnemius lateralis
SL	94.5±12.0	86.8±10.4^a ^b	98.0±8.8^c	88.3±13.1^a ^d	0.725	<0.001	0.657
MH	95.4±10.3	82.5±17.1^a ^b	99.1±14.9^c	87.4±13.6^a ^d	(0.02)	(0.63)	(0.05)
SH	89.7±12.1	83.0±13.8^a ^b	97.6±8.1^c	88.2±13.4^a ^d
RMS tibialis anterior
SL	85.6±13.2^a	72.5±13.9^a ^b	98.4±10.8^c	83.4±16.1^a ^d	0.302	<0.001	0.039
MH	87.3±10.4^a	84.4±15.5^a ^b	96.6±10.8^c	85.1±10.8^a ^d	(0.10)	(0.71)	(0.15)
SH	83.9±13.3^a	76.3±13.2^a ^b	90.0±10.0^c	80.5±13.7^a ^d

Mean ± SD (n = 13). The repeated-sprint exercise protocol included a first set of 8 sprints performed at sea level (SL), moderate (MH), or severe hypoxia (SH), while the second set of 4 sprints was always performed at SL.

^{a, b, c, and d}

significant different from sprint 1, 4, 8, and 9, respectively (P < 0.05).

significant different from SL (P < 0.05).