| Autor: |
Mallett, Adam, Bellinger, Phillip, Derave, Wim, McGibbon, Katie, Lievens, Eline, Kennedy, Ben, Rice, Hal, Minahan, Clare |
| Předmět: |
|
| Zdroj: |
International Journal of Sports Physiology & Performance; Nov2021, Vol. 16 Issue 11, p1670-1675, 6p, 1 Chart, 2 Graphs |
| Abstrakt: |
Purpose: To determine the influence of muscle fiber typology (MFT) on the pacing strategy of elite swimmers competing in the 200-m freestyle event. Method: The top 3 career-best performances from 25 elite 200-m freestyle swimmers were analyzed—12 women (1:58.0 [0:01.3] min:s) and 13 men (1:48.4 [0:02.5]). Muscle carnosine concentration was quantified by proton magnetic resonance spectroscopy in the gastrocnemius and soleus muscles and expressed as a carnosine aggregate z score (CAZ score) relative to an age- and gender-matched nonathlete control group to estimate MFT. Linear regression models were employed to examine the influence of MFT on the percentage of overall race time spent in each 50-m lap. Results: Swimmers with a higher CAZ score spent a greater percentage of race time in lap 3 compared with swimmers with a lower CAZ score (0.1%, 0.0% to 0.2%; mean, 90% confidence interval, P =.02). For every 1% increase in the percentage of race time spent in lap 1, the percentage of race time spent in lap 3 decreased by 0.4% for swimmers with a higher CAZ score (0.2% to −0.5%, P =.00, r = −.51), but not for swimmers with a lower CAZ score (−0.1%, −0.3% to 0.1%, P =.28, r = −.18). The percentage of race time spent in lap 4 decreased by 0.8% for higher-CAZ-score swimmers (−0.5% to −1.0%, P =.00, r = −.66) and by 0.9% for lower-CAZ-score swimmers (−0.6% to −1.3%, P =.00, r = −.65) when lap 1 percentage increased by 1%. Conclusion: MFT may influence the pacing strategy of swimmers in the 200-m freestyle event, which provides an avenue for maximizing individualized pacing strategies of elite swimmers. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
