Intra-set rest configuration induced significantly lower cardiovascular stress, as measured by rate pressure product, and lower central and peripheral fatigue compared to traditional set configuration.
RCT (n=11)
Counterbalanced
No
Does an intra-set rest configuration (ISR) reduce muscle fatigue and cardiovascular stress compared to traditional resistance (TS) training in subjects performing isometric knee extension?
Intra-set rest configurations during resistance exercise induce less central and peripheral fatigue and lower cardiovascular stress compared to traditional set configurations.
Absolute Event Rate: 9007% vs 12425%
p-value: p=0.001
PURPOSE: Cardiovascular responses of traditional resistance (TS) training have been extensively explored. However, the fatigue mechanisms associated with an intra-set rest configuration (ISR) have not been investigated. This study compares two modalities of set configurations for resistance exercise that equates work to rest ratios and measures the central and peripheral fatigue in combination with cortical, hemodynamic and cardiovascular measures. METHODS: 11 subjects performed two isometric knee extension training sessions using TS and ISR configurations. Voluntary activation (VA), single twitch amplitude, low frequency fatigue (LFF), Mwave, motor evoked potential (MEP), short intracortical inhibition (SICI), intracortical facilitation (ICF) and heart rate variability were evaluated before and after each training session. During each session beat to beat heart rate, blood pressure and rate pressure product (RPP) were also evaluated. RESULTS: After exercise VA decreased significantly for TS but not for ISR (P < 0.001), single twitch amplitude and LFF values were lower for TS than ISR (P < 0.004), and SICI was reduced only for the TS configuration (P = 0.049). During exercise RPP values were significantly higher for the TS than for ISR (P = 0.001). RPP correlated with VA for TS (r = -.85 P < 0.001) suggesting a relationship between central fatigue and cardiovascular stress. CONCLUSIONS: We conclude that ISR induced lower central and peripheral fatigue as well as lower cardiovascular stress in comparison with TS configuration. Our study suggests that set configuration is a key factor in the regulation of the neuromuscular and cardiovascular responses of resistance training.
Río-Rodríguez et al. (Wed,) conducted a rct in Healthy physically active subjects (n=11). Intra-set rest configuration (ISR) vs. Traditional set configuration (TS) (4 sets of 50% MVC, duration 80% of TTF, 180s rest) was evaluated on Rate pressure product (RPP) during exercise (p=0.001). Intra-set rest configuration induced significantly lower cardiovascular stress, as measured by rate pressure product, and lower central and peripheral fatigue compared to traditional set configuration.
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