Author(s): Aslam N Khan

Abstract:
The purpose of this study was to determine how two distinct interval‐training protocols supramaximal‐intensity interval training (SMIT) and high‐intensity interval training (HIIT) affect sprint speed and speed‐endurance in trained male sprinters. thirty trained male sprinters (aged 20-25 years) from the Bishnupur District, Manipur, India, were randomly assigned to one of three groups (n=10): a supramaximal‐intensity interval training (SMIT) group, a high‐intensity interval training (HIIT) group, or an untrained control. Over a 12‐week period (three sessions per week), SMIT and HIIT sessions were integrated into each athlete’s standard track‐and‐field regimen, with pre‐ and post‐intervention assessments comprising a 30 m dash to gauge maximal sprint velocity and a 110 yd sprint to evaluate speed‐endurance. Within‐group changes were analyzed via paired‐sample t‐tests (reporting means, mean differences, t‐ratios, and percent change), while between‐group differences in adjusted post‐test scores were examined using ANCOVA (α = 0.05) followed by Scheffé’s post hoc comparisons when warranted. The ANCOVA revealed significant group effects for both sprint speed (F (2, 26) = 15.88) and speed‐endurance (F (2, 26) = 16.69), surpassing the critical F value of 3.37, with both SMIT and HIIT producing substantial gains over controls and SMIT showing a marginally larger effect on endurance capacity. These results demonstrate that structured, varied‐intensity interval protocols can meaningfully enhance the key performance indicators of speed and speed‐endurance in competitive athletics, offering practical guidance for coaches seeking to optimize training adaptations.

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