Effects of two drop-jump protocols with different volumes on vertical jump performance and its association with the force–velocity profile
- 31 Downloads
This study aimed to evaluate the changes in countermovement jump (CMJ) height after two drop-jump (DJ) protocols with different volumes, and to explore the possibility of predicting the changes in CMJ height based on the vertical force–velocity (F–v) profile.
Thirty-four male athletes (age: 21.9 ± 2.0 years) were tested on three occasions. The F–v profile during the CMJ exercise was determined in the first session. Two DJ protocols (low-volume [1 set of 5 DJ trials from a 30 cm height] and high-volume [3 sets of 5 DJ trials from a 30 cm height]) were randomly performed during the second and third sessions, and the unloaded CMJ height was evaluated before (Pre), 4 min (Post4), 8 min (Post8), and 12 min (Post12) after the DJ protocol.
CMJ height was significantly higher at Post4 (2.5 cm [95% confidence interval (CI) = 2.0–3.0 cm]; ES = 0.35), Post8 (2.1 cm [95% CI = 1.4–2.8 cm]; ES = 0.29) and Post12 (2.2 cm [95% CI = 1.4–3.0 cm]; ES = 0.30) compared to Pre. The only significant interaction (protocol × time) was caused by a higher increment in CMJ height at Post4 for the low-volume (8.1 ± 3.7%) compared to the high-volume (5.8 ± 3.9%) protocol. The F–v profile did not explain a significant part of the change in CMJ height (variance explained < 10%).
These results suggest that low-volume DJ protocols could be more efficient to acutely increase CMJ performance, while the change in CMJ height was not affected by the F–v profile.
KeywordsForce–velocity relationship Jump height Maximal power Plyometric
Maximal theoretical force
Maximal theoretical velocity
Maximal theoretical power
We would like to thank all the students who selflessly participated in the study.
ABR, SSL, MRP and PJR conceived and designed research. ABR, SSL, and MRP conducted experiments. ABR, SSL, MRP and AGR analyzed data. ABR, SSL and AGR wrote the manuscript. All authors read and approved the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Hopkins W (2000) Calculations for reliability (Excel spreedsheet). In: A New View Stat. https://www.sportsci.org/resource/stats/relycalc.html%7B#%7Dexcel
- Jaric S (2015) Force–velocity relationship of muscles performing multi-joint maximum performance tasks complimentary and personal copy for force–velocity relationship of muscles performing multi-joint maximum performance tasks. Int J Sports Med. https://doi.org/10.1055/s-0035-1547283 CrossRefPubMedGoogle Scholar