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Effects of Sled Towing on Peak Force, the Rate of Force Development and Sprint Performance During the Acceleration Phase.

Martínez-Valencia MA, Romero-Arenas S, Elvira JL, González-Ravé JM, Navarro-Valdivielso F, Alcaraz PE - J Hum Kinet (2015)

Bottom Line: Repeated-measures ANOVA showed significant increases (p ≤ 0.001) in sprint times (20 and 30 m sprint) for each resisted condition as compared to the unloaded condition.The RFDpeak increased significantly when a load increased (3129.4 ± 894.6 N·s-1, p ≤ 0.05 and 3892.4 ± 1377.9 N·s-1, p ≤ 0.01).Otherwise, no significant increases were found in Fpeak and TRFD.

View Article: PubMed Central - PubMed

Affiliation: UCAM Research Center of High Performance Sport, San Antonio Catholic University of Murcia, Guadalupe, Murcia, Spain.

ABSTRACT
Resisted sprint training is believed to increase strength specific to sprinting. Therefore, the knowledge of force output in these tasks is essential. The aim of this study was to analyze the effect of sled towing (10%, 15% and 20% of body mass (Bm)) on sprint performance and force production during the acceleration phase. Twenty-three young experienced sprinters (17 men and 6 women; men = 17.9 ± 3.3 years, 1.79 ± 0.06 m and 69.4 ± 6.1 kg; women = 17.2 ± 1.7 years, 1.65 ± 0.04 m and 56.6 ± 2.3 kg) performed four 30 m sprints from a crouch start. Sprint times in 20 and 30 m sprint, peak force (Fpeak), a peak rate of force development (RFDpeak) and time to RFD (TRFD) in first step were recorded. Repeated-measures ANOVA showed significant increases (p ≤ 0.001) in sprint times (20 and 30 m sprint) for each resisted condition as compared to the unloaded condition. The RFDpeak increased significantly when a load increased (3129.4 ± 894.6 N·s-1, p ≤ 0.05 and 3892.4 ± 1377.9 N·s-1, p ≤ 0.01). Otherwise, no significant increases were found in Fpeak and TRFD. The RFD determines the force that can be generated in the early phase of muscle contraction, and it has been considered a factor that influences performance of force-velocity tasks. The use of a load up to 20% Bm might provide a training stimulus in young sprinters to improve the RFDpeak during the sprint start, and thus, early acceleration.

No MeSH data available.


Related in: MedlinePlus

Increments in sprint time across all testing conditions in the 20 m and 30 m sprint *** = significant differences (p ≤ 0.001) from the unload sprint
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f3-jhk-46-139: Increments in sprint time across all testing conditions in the 20 m and 30 m sprint *** = significant differences (p ≤ 0.001) from the unload sprint

Mentions: The results showed that all increments in resistance resulted in significant increases in sprint time, both in the 20 m and 30 m sprints (Figure 3). The sprint times when towing a sled with a load of 10%, 15% and 20% Bm were significantly different from that of the un-loaded sprint for both the 20 m (p < 0.001; η2p = 0.909; 1-β = 1.00) and 30 m (p < 0.001; η2p = 0.915; 1-β = 1.00) intervals. In addition, significant differences (p < 0.05) were found between each resisted condition (10%, 15%, and 20% Bm) in both distances.


Effects of Sled Towing on Peak Force, the Rate of Force Development and Sprint Performance During the Acceleration Phase.

Martínez-Valencia MA, Romero-Arenas S, Elvira JL, González-Ravé JM, Navarro-Valdivielso F, Alcaraz PE - J Hum Kinet (2015)

Increments in sprint time across all testing conditions in the 20 m and 30 m sprint *** = significant differences (p ≤ 0.001) from the unload sprint
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519204&req=5

f3-jhk-46-139: Increments in sprint time across all testing conditions in the 20 m and 30 m sprint *** = significant differences (p ≤ 0.001) from the unload sprint
Mentions: The results showed that all increments in resistance resulted in significant increases in sprint time, both in the 20 m and 30 m sprints (Figure 3). The sprint times when towing a sled with a load of 10%, 15% and 20% Bm were significantly different from that of the un-loaded sprint for both the 20 m (p < 0.001; η2p = 0.909; 1-β = 1.00) and 30 m (p < 0.001; η2p = 0.915; 1-β = 1.00) intervals. In addition, significant differences (p < 0.05) were found between each resisted condition (10%, 15%, and 20% Bm) in both distances.

Bottom Line: Repeated-measures ANOVA showed significant increases (p ≤ 0.001) in sprint times (20 and 30 m sprint) for each resisted condition as compared to the unloaded condition.The RFDpeak increased significantly when a load increased (3129.4 ± 894.6 N·s-1, p ≤ 0.05 and 3892.4 ± 1377.9 N·s-1, p ≤ 0.01).Otherwise, no significant increases were found in Fpeak and TRFD.

View Article: PubMed Central - PubMed

Affiliation: UCAM Research Center of High Performance Sport, San Antonio Catholic University of Murcia, Guadalupe, Murcia, Spain.

ABSTRACT
Resisted sprint training is believed to increase strength specific to sprinting. Therefore, the knowledge of force output in these tasks is essential. The aim of this study was to analyze the effect of sled towing (10%, 15% and 20% of body mass (Bm)) on sprint performance and force production during the acceleration phase. Twenty-three young experienced sprinters (17 men and 6 women; men = 17.9 ± 3.3 years, 1.79 ± 0.06 m and 69.4 ± 6.1 kg; women = 17.2 ± 1.7 years, 1.65 ± 0.04 m and 56.6 ± 2.3 kg) performed four 30 m sprints from a crouch start. Sprint times in 20 and 30 m sprint, peak force (Fpeak), a peak rate of force development (RFDpeak) and time to RFD (TRFD) in first step were recorded. Repeated-measures ANOVA showed significant increases (p ≤ 0.001) in sprint times (20 and 30 m sprint) for each resisted condition as compared to the unloaded condition. The RFDpeak increased significantly when a load increased (3129.4 ± 894.6 N·s-1, p ≤ 0.05 and 3892.4 ± 1377.9 N·s-1, p ≤ 0.01). Otherwise, no significant increases were found in Fpeak and TRFD. The RFD determines the force that can be generated in the early phase of muscle contraction, and it has been considered a factor that influences performance of force-velocity tasks. The use of a load up to 20% Bm might provide a training stimulus in young sprinters to improve the RFDpeak during the sprint start, and thus, early acceleration.

No MeSH data available.


Related in: MedlinePlus