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Document Type

Abstract

Publication Date

1-14-2026

Abstract

Based on the FITT-VP principle, this study investigated the dose-response relationship between tennis participation and cardiorespiratory fitness (CRF) in college students. Addressing the current reliance on expert consensus for exercise prescription and the lack of dose-regulation mechanisms, this study focused on high-intensity interval training (HIIT) and sprint interval training (SIT). It aimed to analyze the dynamic relationship and biological mechanisms between exercise intensity (SIT: 80-100% HRmax vs. HIIT: 75-90% HRmax), duration (8 weeks, frequency 2-3 sessions/week), and key CRF indicators (VO2max, anaerobic threshold, and exercise efficiency). Forty healthy college students with similar tennis experience were randomly assigned to HIIT (n=10), SIT (n=10), HIIT+SIT (n=10), or moderate-intensity continuous training (MICT, 60-70% HRmax, n=10) groups for an 8-week intervention. Pre- and post-intervention measurements included body composition, cardiopulmonary parameters (VO2max, anaerobic threshold, exercise efficiency), and physiological indicators (heart rate recovery, blood lactate concentration). Statistical analyses employed two-way repeated-measures ANOVA for group differences and mixed-effects models to quantify the relationship between CRF improvement and dose parameters. Multidimensional data integration was performed using PCA-PLS-DA. Post-exercise plasma PGC-1α levels were measured via ELISA, and mitochondrial oxidative capacity was assessed using near-infrared spectroscopy (NIRS) of the vastus lateralis. 1) HIIT significantly improved VO2max (12.9%, p < 0.05) compared to SIT (7.6%), with increases positively correlated with PGC-1α elevation (r=0.67, p < 0.01). SIT showed greater improvement in peak anaerobic power (Δ15.3%) than HIIT (9.7%). 2) The HIIT+SIT group exhibited synergistic effects, with exercise efficiency increasing by 11.7% (ΔECR) and heart rate recovery improving by 8.8s (ΔHRR). 3) Dose-response modeling revealed a linear trend for HIIT (R²=0.72) and an intensity threshold effect for SIT (≥90% HRmax). The dose-response effects of tennis on CRF may be mediated by the AMPK-PGC-1α pathway. The study proposes a “stepwise” training regimen based on the interaction of “intensity-volume” for different training goals (aerobic capacity/anaerobic endurance), providing new insights for personalized exercise prescription design.

DOI

https://doi.org/10.18122/ijpah.5.1.94.boisestate

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