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Table 4 Muscle tissue oxygen saturation data for 10 sets of bench press exercise in 19 resistance trained men receiving placebo or supplement in a cross-over design.

From: Comparison of pre-workout nitric oxide stimulating dietary supplements on skeletal muscle oxygen saturation, blood nitrate/nitrite, lipid peroxidation, and upper body exercise performance in resistance trained men

Variable† Condition Set 1** Set 2 Set 3 Set 4 Set 5 Set 6 Set 7 Set 8 Set 9 Set 10
StO2 start (%) Baseline 85.2 ± 1.1 90.2 ± 1.3 91.0 ± 1.0 91.2 ± 1.1 91.4 ± 0.9 91.8 ± 0.9 91.9 ± 0.8 92.2 ± 0.8 92.1 ± 0.8 92.7 ± 0.7
StO2 end (%) Baseline 39.7 ± 3.5 44.8 ± 3.5 47.3 ± 4.2 47.3 ± 3.6 49.0 ± 3.0 49.7 ± 3.1 50.1 ± 2.7 47.8 ± 3.1 48.0 ± 2.8 48.0 ± 3.5
StO2 difference Baseline 45.5 ± 3.3 45.4 ± 3.4 43.7 ± 3.9 43.9 ± 3.5 42.4 ± 2.8 42.1 ± 2.8 41.8 ± 2.6 44.4 ± 2.9 44.1 ± 2.7 44.7 ± 3.3
StO2 start (%) Placebo 84.3 ± 1.3 91.0 ± 0.8 91.4 ± 0.8 91.8 ± 0.7 91.9 ± 0.8 92.3 ± 0.7 92.0 ± 0.7 92.2 ± 0.7 92.5 ± 0.6 92.5 ± 0.6
StO2 end (%) Placebo 39.2 ± 3.7 45.8 ± 4.2 48.8 ± 4.0 48.8 ± 4.5 50.1 ± 3.8 48.9 ± 4.3 49.0 ± 4.1 47.9 ± 4.1 50.1 ± 4.2 50.2 ± 4.0
StO2 difference Placebo 45.1 ± 3.5 45.2 ± 4.3 42.5 ± 4.2 43.0 ± 4.6 41.2 ± 3.8 43.3 ± 4.3 42.9 ± 4.1 44.3 ± 4.0 42.5 ± 4.1 42.3 ± 3.9
StO2 start (%) GlycoCarn®* 84.5 ± 0.8 92.1 ± 0.5 92.5 ± 0.5 92.5 ± 0.4 93.0 ± 0.4 92.9 ± 0.4 93.1 ± 0.5 92.9 ± 0.4 93.0 ± 0.4 92.7 ± 0.5
StO2 end (%) GlycoCarn® 40.5 ± 3.7 45.3 ± 3.6 46.9 ± 4.7 49.1 ± 3.9 49.9 ± 3.8 51.5 ± 3.7 50.5 ± 3.7 52.5 ± 3.7 49.6 ± 4.0 50.4 ± 3.4
StO2 difference GlycoCarn® 44.0 ± 3.7 46.8 ± 3.4 45.6 ± 4.6 43.5 ± 3.8 41.1 ± 3.7 41.4 ± 3.7 42.6 ± 3.7 40.4 ± 3.6 43.3 ± 3.9 42.4 ± 3.4
StO2 start (%) SUPP1 83.6 ± 1.1 90.7 ± 0.8 91.3 ± 0.7 91.6 ± 0.6 91.8 ± 0.7 92.1 ± 0.6 92.7 ± 0.5 92.5 ± 0.6 92.4 ± 0.5 92.4 ± 0.5
StO2 end (%) SUPP1*** 38.4 ± 4.9 40.3 ± 4.6 40.7 ± 4.7 43.3 ± 4.7 42.8 ± 4.6 44.0 ± 4.4 46.2 ± 4.6 43.1 ± 4.7 43.8 ± 4.8 45.3 ± 4.9
StO2 difference SUPP1*** 45.2 ± 4.8 50.4 ± 4.9 50.6 ± 4.7 48.4 ± 4.7 48.9 ± 4.5 48.1 ± 4.3 46.5 ± 4.6 49.4 ± 4.6 48.5 ± 4.7 47.1 ± 4.8
StO2 start (%) SUPP2* 85.7 ± 1.3 90.1 ± 0.9 90.6 ± 0.8 91.4 ± 0.7 91.7 ± 0.7 91.6 ± 0.7 91.9 ± 0.7 92.5 ± 0.7 91.9 ± 0.7 92.5 ± 0.7
StO2 end (%) SUPP2 38.2 ± 3.5 44.3 ± 4.1 47.2 ± 4.2 47.5 ± 3.5 50.0 ± 3.7 49.6 ± 4.3 51.1 ± 4.1 50.4 ± 4.4 51.2 ± 3.8 53.6 ± 3.7
StO2 difference SUPP2 47.5 ± 3.3 45.8 ± 3.8 43.4 ± 3.9 43.9 ± 3.4 41.7 ± 3.5 42.1 ± 4.1 40.9 ± 3.8 42.1 ± 4.0 40.8 ± 3.6 38.9 ± 3.4
StO2 start (%) SUPP3 84.2 ± 1.1 90.8 ± 0.9 91.1 ± 0.9 91.6 ± 0.8 91.7 ± 0.7 91.9 ± 0.7 92.0 ± 0.6 92.1 ± 0.6 92.4 ± 0.6 92.9 ± 0.6
StO2 end (%) SUPP3 42.9 ± 4.2 47.1 ± 4.1 47.9 ± 3.7 50.9 ± 4.0 47.9 ± 3.3 49.7 ± 3.6 49.5 ± 3.9 51.3 ± 3.9 51.0 ± 4.0 51.1 ± 4.0
StO2 difference SUPP3 41.2 ± 3.8 43.7 ± 3.9 43.2 ± 3.5 40.7 ± 3.7 43.8 ± 3.2 42.2 ± 3.4 42.6 ± 3.7 40.8 ± 3.7 41.4 ± 3.8 41.8 ± 3.7
  1. Data are mean ± SEM.
  2. StO2 Start: *Condition effect (p = 0.02); GlycoCarn® higher than SUPP2. **Time effect (p < 0.0001); Set 1 lower than all other sets. No condition × set interaction (p = 1.00).
  3. StO2 End: ***Condition effect (p = 0.003); SUPP1 lower than all other conditions. **Time effect (p = 0.002); Set 1 lower than sets 5-10. No condition × set interaction (p = 1.00).
  4. StO2 Difference: ***Condition effect (p = 0.004); SUPP1 greater than all other conditions. No time effect (p = 0.94) or condition × set interaction (p = 1.00).
  5. † StO2 values monitored continuously during the 10 set exercise protocol. Start values indicate the value prior to beginning each set of exercise. End values indicate the value at the conclusion of each set of exercise.