| Popis: |
This study: 1) compared three (i.e., V-slope, Bhambhani et al., 1997, and Belardinelli et al., 1995) techniques of measuring the ventilatory threshold (VT), 2) examined the relation between OMNI RPE and muscle deoxygenation (MD), and 3) evaluated the impact of gender on MD and RPE. Subjects included 20 males and 13 females, aged 25-29 years. A commercial NIRS sensor (NIRS Micro-Run Man model # MRM-96) was placed over the right vastus lateralis and secured with an elastic wrap. Next, each subject underwent a progressive multistage cycle ergometer test to establish the VT using the V-slope method and NIRS methods. The V-slope (58.62 ± 10.47% VO2peak), Bhambhani et al. 1997 (49.75 ± 20.13% VO2peak), and Belardinelli et al. 1995 (60.87 ± 10.15% VO2peak) methods did not result in different (F(2,49) = 2.77, p > 0.05) VT values. The following significant linear regression equation was generated (p = 0.016): OMNI RPE = 5.97 (15.20)MD (R = -0.20, R2 = 0.04, and SE = 2.76). The two-way ANOVA (gender x power output) conducted on OMNI RPE revealed a significant main effect for gender (F(1,193) = 19.53, p < 0.05). Males had lower RPEs (6.32 ± .17) than females (7.16 ± .28). A significant main effect for power output was also found (F(9, 193) = 56.21, p < 0.05). In addition, a significant gender x power output interaction was found (F(7, 193) = 2.11, p < 0.05). With respect to MD, the two-way ANOVA revealed a significant main effect for gender (F(1, 133) = 10.61, p < 0.05). Females had less MD (0.012 ± .007) than males (0.002 ± .005). The results of this study indicate that the three methods of determining the VT were not different. MD values decreased with increasing ratings of perceived exertion. RPE differed between genders, with males having lower RPEs than females (p < 0.05). Also, a significant gender x power output interaction was found (p < 0.05). Finally, women experienced less skeletal MD than men during a progressively incremented cycle ergometer protocol. |
