Showing 10 results for Fatigue
Ali Reza Amani, Homa Esmaeili, Zahra Aeinparast, Farideh Tari,
year 4, Issue 1 (4-2016)
Abstract
Improving anaerobic performance and anaerobic power is the critical aspect on successfully in competitions for many athletes. The purpose of current research was to investigating the effect of various pre-competitions warm-up on anaerobic performance. It has been shown that, differences pre-competitions activity may effect on anaerobic and explosive performance. Effect of general warm-up, without warm-up and warm-up with specific static stretch training were examined on anaerobic power. Twenty four young women were recruited in this research. Subjects (20 ± 2.4 years; 164.91 ± 7.54 cm; 62.04 ± 12.34 kg) were performed three pre-test workouts and in the next step, the Wingate test (30 Second) was used to determination of anaerobic power and fatigue index. Familiar session was performed 48 hours before first test. Data management and analysis was performed by one-way ANOVA repeated measure, using SPSS 20.0. The Result of this study indicated that, there is not significant different on fatigue index and maximum anaerobic power in three conditions (P>0.05). It is interesting to note that 30 seconds anaerobic performance was not affected by pre-competitions activities in three stage of this study.
Mohammad Rashidi, Mahsa Sedaghat, Manizheh Shahvaranian,
year 5, Issue 1 (4-2017)
Abstract
Background. Fatigue has an undesirable effect on the continued exercise performance and decreases athlete's activity. Fast lactic acid disposed is high of importance for athletes.
Objectives. Therefore, the present article determines the effects of the different frequencies of whole-body vibration after a strenuous activity on blood lactic acid.
Methods. 60 athletes were chosen from selected athletes of provincial championship through bruce test. The athletes randomly were divided into four groups of 15 participating in the initial recovery scheme after strenuous exercise (Cunningham test). The first group did initial passive/ inactive recovery that the subjects sat on a chair after exercise and the second to fourth did initial 15 minutes active retrieval on the vibration platform at different rate /with different speed. Their blood lactic acid was checked in three phases by manual lactometer (before activity, immediately after the activity, 15 minutes recovery period the initial situation).
Results. The result of this research indicated that the average level of lactic acid immediately after activity to before activity among 4 groups was significantly different (P=0.006). decrease in lactic acid 15 minutes after the initial state recovery to immediately after that, was significant in all groups (p<0/001). In initial recovery with 20 HZ WBV at amplitude of 5mm lactic acid repelling excretion was the most.
Conclusion. In general, it is showed that to excrete the lactic acid after exhausting and intense activity active initial state recovery scheme with whole- body vibration (WBV) at 20 HZ and on amplitude of 5 mm had much more useful effects on reducing lactic acid after exhausting and intense activities than other schemes. Hence, active initial recovery with whole – body vibration at mentioned rate is recommended to remove immediately the lactic acid from the body after intense anaerobic exercise.
Seifeddine Brini, Hamza Marzouki, Carlo Castagna, Anissa Bouassida,
year 6, Issue 3 (10-2018)
Abstract
Background. Most studies related to the effect of Ramadan fasting on aerobic and anaerobic performances found in the literature were concerned with individual sports; even studies on team sports were mostly dedicated to football, and none of those studies were involved basketball competitions.
Objectives. This field investigation examined the effects of a training program in the basics of small-sided games (SSGs) and repeated sprint ability (RSA) during Ramadan observance (R) and a month after Ramadan (AR) (control month)on aerobic and (''anaerobic'') performances in fasting basketball players.
Methods. Sixteen basketball players (age, 23.4 ± 2.3 years; height, 1.86 ± .09 m; body mass, 78.3±11.0 kg; and VO2max, 51.0 ± 2.7 ml.min-1.kg-1) performed two training programs (SSG and RSA) during R and AR, interrupted by fifteen days of total recovery, and were randomly allocated into two groups (GSSG, n=8 and GRSA, n=8). RSA parameters, mean heart rate (HR), and aerobic performances were measured on four occasions: before (P1) and after (P2) R and before (P’1) and after (P’2) AR.
Results. The results have shown that RSA and Ramadan show no significant differences in aerobic and anaerobic performances when compared with SSG and non-Ramadan in senior basketball players. However, there was a significant difference in mean HR (p=0.03) between groups when comparing R and AR for GSSG.
Conclusion. This study indicated that Ramadan fasting combined with SSG and RSA training has no significant effect on most aerobic and anaerobic performances in male senior basketball players.
Hasan Sozen, Ercument Erdogan, Alparslan Ince, A. Ruhi Soylu,
year 7, Issue 3 (9-2019)
Abstract
Background. Simultaneous tiredness of two or more muscles around a joint can be defined as coordinated fatigue (co-fatigue) and might occur between agonist and antagonist muscles, and vary according to the level of sporting activity levels or gender.
Objectives. The aim of this study was to determine the levels of coordinated fatigue in agonist and antagonist muscles during squat-press exercise.
Methods. Twenty athletes and twenty sedentary subjects participated in the study. Surface electromyography signals of the rectus femoris, vastus lateralis obliquus, biceps femoris and semitendinosus muscles were recorded at the squat press position for 15 seconds during isometric contraction. Measurements were repeated five times and a 2-minute rest period was allowed between repetitions. After erroneous EMG elimination, movement artefacts were removed by using a 20 Hz high-pass Butterworth filter. Then, as a well-recognized fatigue index, the median frequency (MF) of each filtered middle part of the EMG signal (5 to 10 s. of contraction) was calculated, given that it is known that the MF decreases during isometric contractions. Finally, each MF-based co-fatigue index was calculated by dividing the mean RF and VLO median frequencies by the mean ST and BF median frequencies. The cumulative co-fatigue values of “male vs. female” and “sedentary vs. athlete” comparisons were performed by using a two-sided Student t-test with a Bonferroni correction.
Results. There was a statistically significant (Bonferroni corrected p-value < 0.05) difference between the mean female (1.57 ∓ 0.53) and the mean male (1.23 ∓ 0.17) co-fatigue values, while there was no statistically significant difference between the mean co-fatigue values of sedentary (1.51 ∓ 0.52) and athlete (1.29 ∓ 0.27) subjects.
Conclusion. The offered co-fatigue indices might be useful for other sports, physiotherapy and related areas if sufficient scientific proof is accumulated.
Agus Rusdiana, Herman Subarjah, Iman Imanudin, Yopi Kusdinar, Angga M Syahid, Tian Kurniawan,
year 8, Issue 3 (10-2020)
Abstract
Background. The badminton forehand overhead jump smash is one of the high speed and powerful motions among various racket sports.
Objectives. The purpose of this study is to analyze the effect of fatigue on the kinematic variable movement changes during overhead jump smash in badminton.
Methods. This study is descriptive quantitative research with the pre-test and post-test design methods used to obtain data from 15 male badminton players, aged 19.4 ± 1.6 years, height 1.73 ± 0.12 m, and weight 60.8 ± 3.7 kg. The study used three high-resolution handy-cams, motion software Frame DIAZ IV, and 14 point manual markers to analyze body segments’ movement when carrying out a jump smash. Furthermore, an ergo treadmill was used to test the players’ level by running.
Results. The results showed that the shuttlecock velocity was faster during pre-fatigue (188 km/h) than under the condition (145 km/h). A significant difference showed in the angle of shoulder internal rotation (p=0.048) and wrist palmar flexion (p=0.037) at the instant of maximal shoulder external rotation phase. Furthermore, there were significant differences in the shoulder’s internal angular velocity (p=0.042), elbow extension (p=0.035), forearm supination (p=0.024), and wrist Dorsi dorsiflexion.040).
Conclusion. In conclusion, fatigue reduces players’ performances during jumping smash in badminton, thereby leading to slower shuttlecock speed and changes in body segment movements.
Amir Hosein Abedi Yekta, Faraj Tabeii, Shahin Salehi, Mohammad-Reza Sohrabi, Mehrshad Poursaeidesfahani, Mohammad Hassabi, Nina Hazegh, Behnaz Mahdaviani,
year 9, Issue 2 (7-2021)
Abstract
Background. Recovery or post-exercise rehabilitation is an essential part of exercise training. Low-level Laser Therapy (LLLT) is a modality increasing interest for recovery because of having a conservative and non-aggressive method. LLLT also decreases the production of fatigue-related biomechanical markers, such as lactate, C-reactive protein (CRP), and Creatine kinase (CK).
Objectives. To investigate the effect of low-level laser therapy on muscle strength and endurance and post-exercise recovery of young adults between 20-35 years old.
Methods. Fifty subjects were enrolled in this double-blind, placebo-controlled, randomized clinical trial study. Three days after the familiarization session, the subjects were divided into two groups via block randomization: the first group received pre-exercise laser at 810 nm, 60mW, and 60Hz frequency for 30 seconds on three point’s rectus femoris muscle. The other group received a placebo laser on the same points. The operator who was blinded to the allocation of the subjects applied the phototherapy. They underwent an exercise test with a treadmill and a maximum number of knee extensions with a 10 Kilograms (Kg) weight. The test results, level of blood lactate, perceived exertion of fatigue, and muscle soreness were assessed, and the results were analyzed.
Results. The blood lactate level, the severity of muscle pain, the perceived exertion of fatigue, and the repetition of knee extensions with a 10 kg weight, had a statistically significant difference between laser and placebo groups (p < 0.05).
Conclusion. The use of LLL before exercise may improve muscular performance and reduce muscle soreness and fatigue.
Saiful Adli Bukry, Mohammed Raja Firhad Raja Azidin, Maria Justine, Haidzir Manaf,
year 10, Issue 2 (6-2022)
Abstract
Background. This study investigated the effects of short-duration high-intensity simulation of soccer fatigue on the dynamic balance and isokinetic strength of the lower limbs in youth soccer players.
Methods. Thirty-nine youth soccer players completed a high-intensity fatigue simulation in 5-min. The participants performed tests on dynamic balance and isokinetic strength before the fatigue simulation (PRE), immediately after simulation (POST5), and 20 min (POST20) and 35 min (POST35) after simulation. Dynamic balance was measured using the Y-Balance test for both legs in the anterior, posteromedial (PM), and posterolateral (PL) directions. The muscle strength of the lower limb was measured using the maximal isokinetic contraction of the dominant leg only.
Results. Dynamic balance was significantly reduced after stimulation in all directions for both legs (P<0.005). Significant reduction in the eccentric hamstring, concentric hamstring, and concentric quadriceps peak torques were also observed (P<0.05). However, no significant reductions were found in the functional hamstring/quadriceps ratio and conventional hamstring/quadriceps ratio (P>0.05).
Conclusion. Fatigue influences dynamic balance, hamstrings, and quadriceps strength which may have implications for higher risk of knee injury in youth players.
Bu Jang, Agus Rusdiana, Sam Sudin,
year 10, Issue 3 (10-2022)
Abstract
Background. This study aimed to analyze core muscle fatigue effects on the kinematic parameters change during volleyball jump serve.
Methods. The participants were sixteen experienced male volleyball players with average age, height, and body weight of 24.6 ± 1.8 years, 1.85 ± 1.6 m, and 79.5 ± 3.5 kg, respectively. This study utilized two high-resolution video cameras, a drone video, a lactate analyzer, and a radar speed gun. Meanwhile, the eight kinematics parameters analyzed at the approach, plant, and jump phases showed that the ball speed decreased significantly in the fatigue condition compared to the non-fatigue counterpart.
Results. There was a significant difference in the jump phase duration, step length, and jump height variables for the fatigue and non-fatigue conditions during the jump serve in volleyball. Furthermore, the six kinematics parameters analyzed in the maximal shoulder external rotation phase showed a significant difference in fatigue and non-fatigue conditions found in the shoulder external rotation and trunk tilt backward parameters. Meanwhile, the maximum angular velocity phase at the upper limb joint during the jump serve showed that the variable shoulder internal rotation decreases significantly in the fatigue condition compared to the non-fatigue counterparts. Also, in the trunk rotation and trunk tilt forward, a significant decrease in the upper limb joint’s maximum angular velocity was observed in the fatigue condition during the volleyball jump serve.
Conclusion. Fatigue reduces players’ performances during jump serve in volleyball, leading to slower ball speed and changes in body segment movements.
Shinsuke Tamai, Ryota Sone, Akari Kitahara, Kai Aoki, Takehito Sugasawa, Kazuhiro Takekoshi, Koichi Watanabe,
year 10, Issue 4 (12-2022)
Abstract
Background. Persistent physical fatigue (PPhF) is one of the most common issues in athletes; salivary human herpes virus 6 and/or 7 (HHV-6/7) have recently attracted attention as novel microbiological markers for its assessment.
Objectives. We aimed to investigate potential variabilities of salivary HHV-6/7 levels in athletes, along with traditional assessments.
Methods. We conducted an observational study over two weeks including 54 healthy male university athletes (n = 44) and non-athletes (n = 10). We used a questionnaire on daily life to monitor the participants’ states and habits. The main measures were salivary HHV-6/7 and secretory immunoglobulin A (SIgA) levels, and total mood disturbance (TMD) scores in the Profile of Mood States.
Results. In the questionnaire on daily life, subjective fatigue increased in the athletes (p < 0.05), while the health condition and daily habits did not change in either group (p > 0.05); accordingly, fatigue may be due to training-induced physical stressors rather than pathological events or changes in daily habits. Salivary HHV-6 levels increased only in the athletes after one week (p < 0.05), whereas salivary HHV-7 and SIgA levels, and TMD scores remained unchanged (p > 0.05).
Conclusion. These findings suggested that salivary HHV-6 may be a more sensitive marker of PPhF than others.
Jun-Young Song, Sam-Ho Park, Byeong-Soo Kim, Myung-Mo Lee,
year 11, Issue 3 (11-2023)
Abstract
Background. The heel-rise test is a measurement method that can evaluate the muscle endurance and muscle fatigue of the plantar flexor. On the other hand, there is a limit to quantifying the criteria because the evaluation method and criteria differ according to the measurement conditions.
Objectives. The purpose of this study is to compare the validity and reliability of the smartphone-based measurement application compared to the standardized surface electromyography (sEMG) for measuring muscle fatigue during the heel-rise test.
Methods. Fifty-seven adults in their 20s participated in the heel-rise test twice a week apart. The concurrent validity for muscle fatigue during the heel-rise test was measured using surface sEMG and 'Calf raise' application, and analyzed through correlation analysis. The intra-rater reliability and inter-rater reliability of the ‘Calf raise’ application were analyzed using ICC.
Results. The Pearson correlation coefficient between the 'Calf raise' application and sEMG showed a statistically significant correlation of r=0.509 for both loss (%) and slope value (p<0.01). The ‘Calf raise’ application showed high intra-rater reliability for loss (%) and slope value with ICC (2,1) = 0.986 and 0.987 respectively. It also showed high inter-rater reliability for loss (%) and slope value with ICC (2,1) =0.946 and 0.926.
Conclusion. The smartphone-based 'Calf rise' application can be usefully used in clinical practice as an evaluation tool capable of not only quantitative evaluation of counting the number of heel-rise tests but also qualitative evaluation of muscle fatigue.
