Effects of Two Isometric Strength Training Methods on Jump and Sprint Performances: A Randomized Controlled Trial

Lum, Danny; Barbosa, Tiago M.; Joseph, Ranald; Balasekaran, Govindasamy

doi:10.1007/s42978-020-00095-w

Cited by 20 publications

(42 citation statements)

References 33 publications

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“…In addition, ISO only improved jump height of a non-countermovement jump [ 19 , 20 ]. These findings are in contrast with findings of other studies whereby ISO was shown to improve countermovement jump (CMJ) height [ 5 , 7 , 8 ]. This may be attributable to the fact that the ISO exercises used by Kubo et al [ 20 ] was single joint exercise and executed at submaximal intensity while the exercises used by Bimson et al [ 5 ] was executed at multiple joint angles, and that used by Lum et al [ 7 ] and Lum and Joseph [ 8 ] were multi-joint exercise executed with maximal effort.…”

Section: Introductioncontrasting

confidence: 99%

“…These findings are in contrast with findings of other studies whereby ISO was shown to improve countermovement jump (CMJ) height [ 5 , 7 , 8 ]. This may be attributable to the fact that the ISO exercises used by Kubo et al [ 20 ] was single joint exercise and executed at submaximal intensity while the exercises used by Bimson et al [ 5 ] was executed at multiple joint angles, and that used by Lum et al [ 7 ] and Lum and Joseph [ 8 ] were multi-joint exercise executed with maximal effort. In addition, despite showing the difference in the effects of PLYO and ISO on jump performances and morphological changes, Burgess et al [ 19 ] and Kubo et al [ 20 ] did not provide data on the changes in force-time characteristics which can provide practitioners with better understanding and comparison of the adaptations to the two modes of strength training.…”

Section: Introductioncontrasting

confidence: 99%

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Comparing the effects of plyometric and isometric strength training on dynamic and isometric force-time characteristics

Lum¹,

Comfort²,

Barbosa³

et al. 2022

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The purpose of the study was to compare the change in dynamic and isometric force-time characteristics after plyometric (PLYO) or isometric strength training (ISO). Twenty-two endurance runners (age = 37 ± 6 years, stature = 1.71 ± 0.05 m, body mass = 62.7 ± 8.6 kg, weekly mileage = 47.3 ± 10.8 km) performed a countermovement jump (CMJ) and isometric mid-thigh pull (IMTP) test during pre- and post-tests. They were then randomly assigned to either PLYO or ISO group and completed 12 sessions of intervention over six weeks. The PLYO included drop jump, single leg bounding and split jump, and the ISO included IMTP and isometric ankle plantar flexion. Significant and large time x group interactions were observed for CMJ countermovement depth ( P = 0.037, ƞ² p = 0.21) and IMTP and relative peak force (PF) ( P = 0.030, ƞ ² p = 0.22). Significant and large main effects for time were observed in CMJ height, peak power, propulsive phase duration, countermovement depth, reactive strength index modified, IMTP PF and relative PF ( P < 0.05, 0.20 ≤ ƞ² p ≤ 0.65). Effect for time showed small improvement in CMJ height for both PLYO ( P < 0.001, d = 0.48) and ISO ( P = 0.009, d = 0.47), small improvement in CMJ PP in PLYO ( P = 0.020, d = 0.21), large increase in countermovement depth ( P = 0.004, d = 1.02) and IMTP relative PF ( P < 0.001, d = 0.87), and moderate increase in propulsive phase duration ( P = 0.038, d = 0.65) and IMTP PF ( P < 0.001, d = 0.55) in ISO. There were large differences between groups for percentage change in countermovement depth ( P = 0.003, d = 0.96) and IMTP relative PF ( P = 0.047, d = 0.90). In conclusion, both PLYO and ISO improved CMJ jump height via different mechanisms, while only ISO resulted in improved IMTP PF and relative PF.

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Section: Introductioncontrasting

confidence: 99%

Section: Introductioncontrasting

confidence: 99%

Comparing the effects of plyometric and isometric strength training on dynamic and isometric force-time characteristics

Lum¹,

Comfort²,

Barbosa³

et al. 2022

Self Cite

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show abstract

“…The IsoSqT, IsoPress and IsoPull involved participants exerting maximal force against a stationary bar as fast and as hard as they could. Each repetition was held for 3 s with 3 s rest in between repetitions [21]. Participants performed the IsoSqT at similar knee flexion angle (~100 • ), IsoPress (~90 • ) and IsoPull (~120 • ) at similar elbow flexion angles, as they adopted when they were initiating the pull phase during 200mTT.…”

Section: Training Programmentioning

confidence: 99%

Sprint Kayaking Performance Enhancement by Isometric Strength Training Inclusion: A Randomized Controlled Trial

Lum

Barbosa

Balasekaran

2021

Sports

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Performing isometric strength training (IST) can enhance various sports performance. This study compared the effects of including IST on sprint kayaking performance as compared to traditional strength training. Twenty sprint kayaking athletes (age 22 ± 4 year, stature 1.71 ± 0.09 m, body mass 72.0 ± 11.4 kg) performed a 200-m kayak ergometer time trial (200mTT), isometric squat (IsoSqT), isometric bench press (IsoPress) and isometric prone bench pull (IsoPull) during the pre- and post-tests. Athletes were randomly assigned to either traditional strength training (TRAD) or IST group. Both groups performed a similar strength training program twice a week for six weeks. However, half the volume for squat, bench press and prone bench pull were replaced by IsoSqT, IsoPress and IsoPull, respectively, for the IST group. IsoSqT was performed at 90° knee angle, while IsoPress and IsoPull were performed at 90° and 120° elbow angles, respectively. Each isometric contraction was performed with maximum intensity and sustained for three seconds. A significant main time effect was observed for 200mTT (p < 0.001, ƞ2p = 0.68) and all isometric strength measures (p = 0.001–0.032, ƞ2p = 0.24–0.76) except rate of force development at 0–90 ms (RFD90) obtained from IsoSqT120 and IsoPress90. A group main effect was observed in RFD90 obtained from IsoSqT120 and IsoPull120 (p = 0.003–0.004, ƞ2p = 0.37–0.39). Time x Group interaction was observed for 200mTT (p = 0.027, ƞ2p = 0.68), peak force obtained from IsoSqT90, IsoPress90, and IsoPull120 (p = 0.004–0.006, ƞ2p = 0.36–0.38) and RFD90 obtained from IsoSqT120 and IsoPull120 (p = 0.012–0.015, ƞ2p = 0.28–0.30). Inclusion of IST resulted in greater improvement for sprint kayaking and strength performances then TRAD alone.

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“…Investigating the effect of isometric stresses on the effectiveness of the jump, scientists have proven the positive effect of isometric stresses on the explosive power values [12]. In their study specialists Lum, Barbosa, Joseph, Balasekaran also described the positive effect of isometric loads with the duration of 3 s (SIST) on explosive power values [13]. S. Jadhav noted an increase in jump height due to the use of isometric training [14].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the influence of different methods of isometric loading (with fast (1 s) and long (3 s) voltage) on the development of explosive power was studied by Lum, Barbosa, Joseph, Balasekaran [9]. The work proved the high efficiency of long-stress exercises for the explosive power development.…”

Section: Introductionmentioning

confidence: 99%

The Analysis of Effectiveness of Elastic Training (Resistant) Bands Application to Develop Explosive Strength

Dyshko¹,

Kosynskyi

Sitovskyi

et al. 2021

Zdor. sport reabìl. [HSR]

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ned: 1) the smallest increase in the standing long jump was observed in the group in which there were trainings with elastic training bands – 4,3 cm; in the group where isometric exercises were used, the increase in standing long jump was 10,9 cm; in the group in which students trained with weights, the increase in the standing long jump was 14 cm; 2) the increase of the leg press index at an angle of 45° in the group that used elastic training bands as a means of weighting was the lowest, i.e. 14 kg; in the group performing isometric exercises it was the highest – 19,5 kg; in the group that used weights – 18 kg. Purpose: to research the effectiveness of elastic training bands (resistance bands) application to develope explosive strength in a comparative aspect. Material and methods: theoretical material for the article has been taken from the research of Ukrainian and foreign scholars and experts. The basis for the study was a research laboratory of functional diagnostics and physical rehabilitation. The study involved 60 18-19-year-old students (40 girls and 20 boys), young people with excellent, very good or good health status. The main methods used for the experiment and the article were comparison, questionnaires, final tests, statistical analysis (parametric and nonparametric analysis, systematization, creation of varieties (arrays), determination of Student’s t-test and Pearson’s χ2 test). Results: the questionnaire of students on the expected effectiveness of various ways of explosive strength training revealed that the lowest result was expected from isometric exercises (5%), the average one was found out from the use of weights (61,67%), and the highest result was shown from the application of elastic training (resistant) bands (65%). According to the results of the experiment the following data has been obtained: 1) the smallest increase in the standing long jump was observed in the group in which there were trainings with elastic training bands – 4,3 cm; in the group where isometric exercises were applied, the increase in standing long jump was 10,9 cm; in the group in which students trained with weights, the gain in the standing long jump was 14 cm; 2) the increase of the leg press index at an angle of 45° in the group that used elastic training bands as a means of weighting was the lowest, i.e. 14 kg; in the group performing isometric exercises it turned out to be the highest – 19,5 kg; in the group that used weights – 18 kg. Conclusion: our experiment involved comparing the impact on the explosive strength development of different means of weighting: elastic training bands, isometric exercises and weighting objects. Despite the expectations of the respondents it was demonstrated that the application of the elastic training bands does not have a significant advantage over other means of weighting. The resistance bands application show lower results compared to the training with the isometric weighting and weighting of objects. The application of exercises in the isometric mode of weighting showed a significant gain in explosive strength, although the expected results were not met. The application of objects’ weighting showed the expected high results. Therefore, the prediction of the high efficiency of elastic training bands as a means of weighting turned out to be spurious

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Effects of Two Isometric Strength Training Methods on Jump and Sprint Performances: A Randomized Controlled Trial

Cited by 20 publications

References 33 publications

Comparing the effects of plyometric and isometric strength training on dynamic and isometric force-time characteristics

Comparing the effects of plyometric and isometric strength training on dynamic and isometric force-time characteristics

Sprint Kayaking Performance Enhancement by Isometric Strength Training Inclusion: A Randomized Controlled Trial

The Analysis of Effectiveness of Elastic Training (Resistant) Bands Application to Develop Explosive Strength

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