Time-course Of Changes In Maximal Force And Rate Of Force Development After A Plyometric Training Session

2015 ◽  
Vol 47 ◽  
pp. 356
Author(s):  
Gregory C. Bogdanis ◽  
Panagiotis Veligekas ◽  
Panagiotis Roxanas ◽  
Konstantinos Chiotelis ◽  
Stavros Petrou ◽  
...  
Keyword(s):  
Time Course ◽  
Training Session ◽  
Rate Of Force Development ◽  
Plyometric Training ◽  
Force Development ◽  
Maximal Force

Effects of Unilateral and Bilateral Plyometric Training on Leg Strength and Rate of Force Development

2016 ◽  
Vol 48 ◽  
pp. 477
Author(s):  
Gregory C. Bogdanis ◽  
Olga Kaloheri ◽  
Athanasios Tsoukos ◽  
Gerasimos Terzis ◽  
Panagiotis Veligekas
Keyword(s):  
Rate Of Force Development ◽  
Plyometric Training ◽  
Force Development ◽  
Leg Strength

Collagen and Vitamin C Supplementation Increases Lower Limb Rate of Force Development

2021 ◽  
pp. 1-9
Author(s):  
Dana M. Lis ◽  
Matthew Jordan ◽  
Timothy Lipuma ◽  
Tayler Smith ◽  
Karine Schaal ◽  
...  
Keyword(s):  
Vitamin C ◽  
Training Program ◽  
Lower Limb ◽  
Mixed Model ◽  
Muscle Power ◽  
Force Plate ◽  
Rate Of Force Development ◽  
Mixed Model Analysis ◽  
Force Development ◽  
Maximal Force

Background: Exercise and vitamin C-enriched collagen supplementation increase collagen synthesis, potentially increasing matrix density, stiffness, and force transfer. Purpose: To determine whether vitamin C-enriched collagen (hydrolyzed collagen [HC] + C) supplementation improves rate of force development (RFD) alongside a strength training program. Methods: Using a double-blinded parallel design, over 3 weeks, healthy male athletes (n = 50, 18–25 years) were randomly assigned to the intervention (HC + C; 20 g HC + 50 mg vitamin C) or placebo (20 g maltodextrin). Supplements were ingested daily 60 min prior to training. Athletes completed the same targeted maximal muscle power training program. Maximal isometric squats, countermovement jumps, and squat jumps were performed on a force plate at the same time each testing day (baseline, Tests 1, 2, and 3) to measure RFD and maximal force development. Mixed-model analysis of variance compared performance variables across the study timeline, whereas t tests were used to compare the change between baseline and Test 3. Results: Over 3 weeks, maximal RFD in the HC + C group returned to baseline, whereas the placebo group remained depressed (p = .18). While both groups showed a decrease in RFD through Test 2, only the treatment group recovered RFD to baseline by Test 3 (p = .036). In the HC + C group, change in countermovement jumps eccentric deceleration impulse (p = .008) and eccentric deceleration RFD (p = .04) was improved. A strong trend was observed for lower limb stiffness assessed in the countermovement jumps (p = .08). No difference was observed in maximal force or squat jump parameters. Conclusion: The HC + C supplementation improved RFD in the squat and countermovement jump alongside training.

The differential effect of metabolic alkalosis on maximum force and rate of force development during repeated, high-intensity cycling

2013 ◽  
Vol 115 (11) ◽  
pp. 1634-1640 ◽  
Author(s):  
Jason C. Siegler ◽  
Paul W. M. Marshall ◽  
Sean Raftry ◽  
Cristy Brooks ◽  
Ben Dowswell ◽  
...  
Keyword(s):  
Sodium Bicarbonate ◽  
High Intensity ◽  
Differential Effect ◽  
Force Production ◽  
Rate Of Force Development ◽  
Maximum Force ◽  
Whole Body ◽  
Peak Power Output ◽  
Force Development ◽  
Maximal Force

The purpose of this investigation was to assess the influence of sodium bicarbonate supplementation on maximal force production, rate of force development (RFD), and muscle recruitment during repeated bouts of high-intensity cycling. Ten male and female ( n = 10) subjects completed two fixed-cadence, high-intensity cycling trials. Each trial consisted of a series of 30-s efforts at 120% peak power output (maximum graded test) that were interspersed with 30-s recovery periods until task failure. Prior to each trial, subjects consumed 0.3 g/kg sodium bicarbonate (ALK) or placebo (PLA). Maximal voluntary contractions were performed immediately after each 30-s effort. Maximal force (Fmax) was calculated as the greatest force recorded over a 25-ms period throughout the entire contraction duration while maximal RFD (RFDmax) was calculated as the greatest 10-ms average slope throughout that same contraction. Fmax declined similarly in both the ALK and PLA conditions, with baseline values (ALK: 1,226 ± 393 N; PLA: 1,222 ± 369 N) declining nearly 295 ± 54 N [95% confidence interval (CI) = 84–508 N; P < 0.006]. RFDmax also declined in both trials; however, a differential effect persisted between the ALK and PLA conditions. A main effect of condition was observed across the performance time period, with RFDmax on average higher during ALK (ALK: 8,729 ± 1,169 N/s; PLA: 7,691 ± 1,526 N/s; mean difference between conditions 1,038 ± 451 N/s, 95% CI = 17–2,059 N/s; P < 0.048). These results demonstrate a differential effect of alkalosis on maximum force vs. maximum rate of force development during a whole body fatiguing task.

The effect of rate of force development on maximal force production: acute and training-related aspects

2007 ◽  
Vol 99 (6) ◽  
pp. 605-613 ◽  
Author(s):  
Andreas Holtermann ◽  
Karin Roeleveld ◽  
Beatrix Vereijken ◽  
Gertjan Ettema
Keyword(s):  
Force Production ◽  
Rate Of Force Development ◽  
Force Development ◽  
Maximal Force ◽  
And Training

scholarly journals Upper body rate of force development and maximal strength discriminates performance levels in sport climbing

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0249353
Author(s):  
Nicolay Stien ◽  
Vegard Albert Vereide ◽  
Atle Hole Saeterbakken ◽  
Espen Hermans ◽  
Matthew Peter Shaw ◽  
...  
Keyword(s):  
Rate Of Force Development ◽  
The Other ◽  
Upper Body ◽  
Relative Time ◽  
Force Development ◽  
Absolute Time ◽  
Time To Peak ◽  
Maximal Force ◽  
Sport Climbing ◽  
Time Periods

The aim of this study was to assess and compare the maximal force and rate of force development (RFD) between intermediate, advanced and elite climbers using several different methods for calculating RFD. Fifty-seven male climbers (17 intermediate, 25 advanced, and 15 elite) performed isometric pull-ups on a climbing-specific hold while the RFD was calculated using several absolute (50, 100, 150, 200, and 250 ms from onset of force) and relative time periods (25, 50, 75, 95, and 100% of time to peak force). The maximal force was higher among elite climbers compared to advanced (ES = 1.78, p < 0.001) and intermediate climbers (ES = 1.77, p < 0.001), while no difference was observed between intermediate and advanced climbers (P = 0.898). The elite group also showed higher RFD than the other two groups at all relative time periods (ES = 1.02–1.58, p < 0.001–0.002), whereas the absolute time periods only revealed differences between the elite vs. the other groups at 50, 100 and 150 ms from the onset of force (ES = 0.72–0.84, p = 0.032–0.040). No differences in RFD were observed between the intermediate and advanced groups at any time period (p = 0.942–1.000). Maximal force and RFD, especially calculated using the longer periods of the force curve, may be used to distinguish elite climbers from advanced and intermediate climbers. The authors suggest using relative rather than absolute time periods when analyzing the RFD of climbers.

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