Movement Velocity as an Indicator of Mechanical Fatigue and Resistance Exercise Intensity in Cross Modalities.

Purpose: This study analyzed the acute mechanical response to three workouts of the day (WOD) protocols in as many repetitions as possible (AMRAP), every minute on the minute (EMOM), and for time (FT) models by quantifying the degree of mechanical fatigue induced by popular resistance exercises in the Cross modalities, front squat (FS), and shoulder press (SP). We also analyzed whether the exercises' fastest velocity (Vfastest) could be an objective indicator of relative intensity (%1RM). Methods: Nine trained men performed three FS and SP exercises protocols. The degree of fatigue was quantified by the velocity loss (VL) achieved in both exercises and the velocity loss achieved in the WOD (VLWOD). Results: The VLWOD in the AMRAP, EMOM, and FT protocols was 73.2 ± 10.9%, 61.6 ± 15.1%, and 76.1 ± 8.8%, respectively. In the AMRAP and FT protocol, the Vfastest showed very strong relationships with the %1RM for FS and SP (r = -0.83, -0.75, respectively, p < .01); while in the EMOM protocol, there was a strong relationship between these variables, only for the SP (r = -0.61, p < .05). In the FT protocol, we observed an extremely strong relationship for FS (r = -0.91, p < .001) and very strong (r = -0.71, p < .05) for SP between these variables. Conclusion: Therefore, the AMRAP and FT training models induce the highest degrees of mechanical fatigue in the FS and SP exercises, and the Vfastest is a reliable tool for estimating relative intensity in resistance exercises of Cross modalities.

Monitoring of the Training Load and Well-Being of Elite Rhythmic Gymnastics Athletes in 25 Weeks: A Comparison between Starters and Reserves.

The objective of this study was to monitor the training loads (TL) and well-being of elite rhythmic gymnastics (RG) athletes, as well as compare these variables between starters and reserve gymnasts during 25 weeks of training. Ten athletes from the Brazilian national RG team (17.4 ± 1.1 y of age) were monitored during the general preparatory period (GPP), specific preparatory period (SPP), and pre-competitive period (PCP). The internal TL was quantified with the use of sessional ratings of perceived exertion (sRPE). We assessed well-being daily with a well-being scale. The TL, duration, monotony, and strain were calculated weekly. We found that the internal TL and session durations were 9242 ± 2511 AU and 2014 ± 450 min, respectively. The internal TL, strain, and monotony were greater in the PCP than in the GPP and SPP for starters. In the SPP, there were statistical differences in internal TL (p = 0.036) and strain (p = 0.027) between starters and reserves. In the PCP, there were also statistical differences between starters vs. reserves athletes regarding internal TL (p = 0.027) and strain (p = 0.05). There was no statistically significant difference in well-being between the periods assessed. In conclusion, RG athletes display a higher TL magnitude during the PCP, whereas only reporting non-significant minor variations in well-being. In addition, there is a discrepancy in the TL between starters and reserves.

Different types of functional training on the functionality and quality of life in postmenopausal women: a randomized and controlled trial.

BACKGROUND: Physical exercise is widely recommended for improving physical fitness. However, the most effective training method in improving the daily life of postmenopausal women is not clear. Therefore, this study compares different ways of functional training, focused on the task, and directed to the physical abilities on the functionality and quality of life of the postmenopausal women. METHODS: Forty-seven participants were randomly assigned into three groups: element-based functional training (EBFT); task-specific-based functional training (TSBFT); and the control group (CG). The intervention lasted fourteen weeks, with three weekly sessions stimulating several physical valences in the same session. The global functionality, functional reach, gait speed, handgrip strength, jumping ability, and quality of life before and after the intervention were evaluated. RESULTS: A similar increase was detected in both experimental groups for the variables-analyzed when compared to the initial moment (P<0.05), except in the dynamic postural control (P>0.05), which showed no difference. However, in the tests of rising from the floor and handgrip strength, only the task-specific-based functional training showed difference over time (P<0.05). CONCLUSIONS: Functional training protocols improve the performance in daily activities of postmenopausal women. However, task-specific-based functional training is more effective when compared to the control group in the analyzed variables.

Prevalence of Injuries in Exercise Programs Based on Crossfit®, Cross Training and High-Intensity Functional Training Methodologies: A Systematic Review.

Current literature shows studies that question the safety of the practices carried out in high-intensity training modalities such as CrossFit®, Cross Training or High-Intensity Functional Training, which may lead to a greater risk in the prevalence of injuries. The aim of this study was to analyze in detail the prevalence of injuries occurring in training based on the CrossFit®, Cross Training or High-Intensity Functional Training modalities, through a systematic review, as well as evaluating the methodological quality of the included studies. We used the recommendations of the PRISMA protocol. For the quality analysis of the studies, we applied the tool proposed by the National Institute of Health (United States). The areas that mainly present a higher risk of injury during CrossFit, Cross Training or High-Intensity Functional Training practices are shoulders, knees and back. Additionally, 11 of the 12 included studies displayed a poor methodological quality according to the quality tool used.

Effects of Ibuprofen Intake in Muscle Damage, Body Temperature and Muscle Power in Paralympic Powerlifting Athletes.

The aim of this study is to evaluate the effect of ingesting ibuprofen on post-workout recovery of muscle damage, body temperature and muscle power indicators in Paralympic powerlifting athletes. The study was carried out with eight Paralympic powerlifting athletes (aged 27.0 ± 5.3 years and 79.9 ± 25.5 kg of body mass) competing at the national level, with a minimum training experience of 12 months, who all submitted to two experimental conditions: Ibuprofen (2 × 00 mg) and control. The maximal isometric force of the upper limbs and rate of force development, thermography, and serum biochemical analyzes of creatine kinase, lactate dehydrogenase, aspartate aminotransferase and alanine aminotransferase were measured before, after, 24 h after and 48 h after the intervention. Maximal isometric force only decreased in the placebo condition, which increased back to baseline levels, while no substantial decline in baseline force was seen in the ibuprofen condition, although no effect for exercise condition was detected. After the exercise, the rate of force development decreased significantly for both conditions and did not exceed baseline levels again after 48 h. Muscle temperature decreased significantly at 48-h post-exercise in the placebo condition, when compared with the previous day of measurement; and deltoid muscle temperature at 48-h post-exercise was higher with the ibuprofen condition. Although the results indicate some positive effects of ibuprofen use, they do not enable a clear statement regarding its positive effects on muscle function and muscle damage. Ibuprofen seems to have caused a delay in the anti-inflammatory response following exercise.

Effects of different multicomponent training methods on functional parameters in physically-active older women.

BACKGROUND: Negative functionality changes are among the effects of aging. The multicomponent training performed on conventional machines or with new implements and features directed to daily activities is strongly recommended among attenuation strategies. However, the efficiency of both types of training is not yet clear in the recent literature. The aim was to compare the effects of different multicomponent training methods on functional parameters in older women. METHODS: Thirty-seven volunteers were randomly selected into the functional multicomponent training (MFT: N.=15), traditional multicomponent training (MTT: N.=14) and control group (CG: N.=8). They were assessed in the tests: Six-Minute Walk Test (6MWT), Ten-Minute Fast Walking Test (10FWT), Timed Up and Go test (TUG), Functional Reach Test (FRT), Ankle Test (AKT), Sit To Stand Modified test (STSM), and quality of life (QOL). ANOVA (3×2) followed by the Bonferroni post-hoc was used, adopting P≤0.05 for statistical significance. RESULTS: When compared pre-post values, MFT showed significant differences in all functional tests evaluated (AKT: P<0.01; STSM: P<0.01; FRT: P<0.01; QOF: P<0.01; 10FWT: P<0.01; 6MWT: P<0.01; TUG: P<0.05). In the same comparison, MTT showed a significant change in all tests (AKT: P<0.01; STSM: P<0.01; FRT: P<0.01; QOF: P<0.05; 6MWT: P≤0.05; TUG: P<0.05) except 10FWT. When compared to CG, MFT showed a significant difference in all walking tests and MTT showed a better performance in 10FWT and TUG. CONCLUSIONS: Both experimental protocols were effective to improve functional parameters in older women. However, the MFT was performed better in most tests that required efficiency in gait ability.

Inter-day reliability of the Upper Body Test for shoulder and pelvic girdle stability in adults.

BACKGROUND: There are a limited number of tests for the assessment of shoulder and pelvic girdle stability. Reliable instruments are important to evaluate movement dysfunction at these joints in order to provide more objective parameters. OBJECTIVE: To evaluate the inter-day reliability of the Upper Body Test in young adults. METHODS: A reliability study was carried out with three assessments of the shoulder and pelvic girdle stability within 48-h intervals (Monday, Wednesday, and Friday). The OctoBalance® platform was used to perform the Upper Body Test in 31 active young adults (24.5±8 years). Intraclass Correlation Coefficient (ICC2,2) two-way mixed model, Coefficient of Variation, and Bland-Altman plots were used to verify the reliability of the test. The standard error of measurement (SEM) and the minimum detectable difference (MDD95%) were calculated for clinical applicability. RESULTS: The Intraclass Correlation Coefficient ranged from 0.87 to 0.94 - Featuring a mean difference of 0.89 (95%CI=-0.19-1.97) to left and 0.95 (95%CI=-0.38-2.27) for the right side, with a low variation coefficient (3.31-5.91%) between the second and third days of assessment. There was a statistically significant difference between the first assessment day and the other test sessions. The Bland-Altman analyses revealed low bias with scores within the limits of agreement. Minimum detectable difference scores were between 4.02 and 5.10, and standard error of measurement between 1.75 and 2.72, depending on the movement side. CONCLUSION: The Upper Body Test presented good inter-day reliability for assessing the stability of the shoulder and pelvic girdle in young active healthy adults.

Functional Training Induces Greater Variety and Magnitude of Training Improvements than Traditional Resistance Training in Elderly Women.

The objective was to investigate the effects of functional (FT) and traditional (TT) training on trunk muscles maximal isometric strength, rate of force development and endurance with trained elderly women. Forty-five elderly women were directed into three groups: FT (n =1 6), TT (n = 14) and Control (n = 15). The FT (multi-planar, and multi-articular movements) and TT (primarily machine-based resistance exercises) performed mobility, muscle strength and power exercises. Both training groups also performed intermittent cardiometabolic activities. The maximum strength and endurance of the trunk muscles were verified, both at baseline and after 12 weeks of training (3xweek for 50 min each). Data were analyzed using a 2-way ANCOVA with contrast of adjusted mean values. FT significantly increased all variables: maximum trunk flexor strength (p = 0.002, 22%); rate of flexor force development (p = 0.001, 84%); trunk extensors maximal strength (p = 0.003, 17%); trunk extensor rate of force development (p = 0.05, 16%); trunk flexors (p = 0.001, 19%) and extensors (p = 0.017, 13%) endurance compared to baseline. TT showed an increase only in RFD of trunk extensors (p = 0.003, 53%), and flexors (p = 0.033, 42%), and trunk flexors endurance (p = 0.008, 11%). However, there was no statistically significant difference between groups. FT promoted improvement in all variables; strength, endurance and rate of force development of the trunk flexors and extensors of the elderly. On the other hand, TT improved only the rate of force development of trunk flexors and extensors and endurance of the trunk flexors. FT is recommended for elderly women as it improves a broader array of physiological parameters.

Reliability of a Test for Assessment of Isometric Trunk Muscle Strength in Elderly Women.

OBJECTIVE: The aim of this study was to analyze the reproducibility of a protocol using the maximal isometric strength test of the trunk in elderly women aged above 60 years, without low back pain. METHODS: Twenty-one physically inactive elderly women, who had not engaged in any activity or exercise program in the past three months, participated in the cross-sectional study that consisted of two days of evaluations for the maximal isometric strength of the extensor and flexor muscles of the trunk, with a 48 h interval between the sessions. A platform with fixed seating was used, which allowed the fixation of the hip and lower limbs, with a load cell connected to a linear encoder. To verify the reliability of the test, the interclass correlation coefficient, variation coefficient, minimum detectable difference (MDD), standard error of measurement, and Bland-Altman graphs were calculated. RESULTS: No statistical difference was observed between the first and second evaluation, which indicates that there was no learning effect. Interclass correlation coefficient values were classified as very high and high for extensor (0.98) and flexor (0.86) muscles, respectively, besides low variation (9% for both muscle groups) and acceptable values for minimum detectable difference (extensors = 51.1 N, flexors = 48.9 N). In addition, the Bland-Altman analysis revealed low bias and values within the limits of agreement. CONCLUSION: It is concluded that the test of maximum isometric strength of the trunk in healthy and trained elderly people presents high reliability. These values proved to be reliable if performed in at least two evaluation sessions, which confirms the hypothesis of the authors by the consistency of the measurement test.

Comparison between functional and traditional training exercises on joint mobility, determinants of walking and muscle strength in older women.

BACKGROUND: Currently, several strength training protocols have been verified aiming improvements on functionality in older population. For this purpose, integrated exercises aimed at improving essential movements may be an interesting strategy in improving performance for daily activities. This randomized trial compared the effects of eight and twelve weeks of functional and traditional training (TT) on joint mobility, gait determinants and muscle strength, and verified the maintenance of the effects after eight weeks of detraining in the older women. METHODS: Fifty-two older women were randomized into three groups: Functional Training (FT: N.=19), TT (TT: N.=16) and Stretching Group (SG: N.=17). The data were analyzed by ANOVA with Bonferroni post-hoc test. RESULTS: The FT and TT groups obtained significant improvements in the tests of muscle strength and muscle power both after twelve weeks of intervention, as well as with SG. Only the FT presented statistically significant improvements in dynamic agility/balance (32%, P=0.000), and cardiorespiratory condition (8.71%, P=0.020) in relation to SG. CONCLUSIONS: The experimental protocols are equally effective in improving joint mobility and strength components in active older women. However, FT seems to be more effective than TT in the improvement of the determinants of gait ability.

The effects of functional and traditional strength training on different strength parameters of elderly women: a randomized and controlled trial.

BACKGROUND: Physical exercise is the main strategy for improving physical fitness in elderly population. However, it is not clear which training method lead to greater adaptations on maximal dynamic strength, muscle power, muscle endurance and isometric strength in this population. Thus, our aim was to compare the effects of functional and traditional training on these variables in the elderly. METHODS: This study lasted twelve weeks, where 44 elderly women were randomly divided into three groups: functional training (FT; N.=18), traditional training (TT; N.=15), and control group (CG; N.=11). Maximal dynamic strength and muscle power tests were performed in pushing (Chest Press), pulling (Seated Row), and squatting (Leg Press 45°) actions. In addition, isometric strength with hand grip test (HG) and isometric dead lift test (ID) and muscle endurance with 30-s chair stand (CS) and 30-s arm curl (AC) tests were used. RESULTS: Both experimental groups improved significantly in strength (FT: Chest Press 24.9%, Leg Press 45° 38.4%, Seated Row 21.6%; TT: Chest Press 27.6%, Leg Press 45° 40.9%, Seated Row 24.5%), power (FT: Chest Press 13.6%, Leg Press 45° 11.6%, Seated Row 13.6%; TT: Chest Press 18.2%, Leg Press 45° 9.8%, Seated Row 19.2%) isometric strength (FT: HG=14.7%, ID=13.6%; TT: HG=19.1%), and endurance (TF: CS=19.6%, AC=23.8%; TT: AC=15.5%) with P≤0.05, except TT in ID (4.4%) and SL (4.6%). There was no difference between experimental groups; however, both experimental groups were statistically superior to CG. CONCLUSIONS: Both training protocols were equally effective in improving different strength manifestations in the elderly.

Effects of Different Resistance Training Frequencies on Fat in Overweight/Obese Older Women.

AIM: This study compared the effect of different resistance training (RT) frequencies on total, android, gynoid and trunk body fat in overweight/obese older women. METHODS: Fifty-seven overweight/obese older women (66.9±5.3 years and 39.9±4.9% body fat) were randomly assigned to one of three groups: a group performing RT twice a week (G2X), a group performing RT three times a week (G3X), or a non-exercise control group (CG). Both training groups performed the same 12-week RT program consisting of 8 exercises that trained all major muscle groups. Dual-energy X-ray absorptiometry was used to assess body composition. RESULTS: After the intervention period, both G2X and G3X demonstrated significant (P<0.05) reductions in adiposity compared to the CG for total body fat (G2X=-1.7%, G3X=-2.7%, CG=+2.1%), android fat (G2X=-6.2%, G3X=-7.0%, CG=+8.6%), gynoid fat (G2X=-2.5%, G3X=-2.9%, CG=+1.0%), and trunk fat (G2X=-2.5%, G3X=-3.0%, CG=+2.9%), with no significant differences between training groups. CONCLUSION: These results demonstrate that a low-volume 12-week RT program performed two or three times per week causes decreases in total and regional fat deposition with the greatest reductions occurring in the android region.

Effects of eight weeks of functional training in the functional autonomy of elderly women: a pilot study.

BACKGROUND: This study aimed to evaluate the effects of eight weeks of practical training on the functional autonomy of the elderly. METHODS: The study included 52 elderly women, 65.42±10.31 years, 65.29±11.30 kg body mass, 1.58±0.07 height, 26.30±4.52 body mass index, 86.48±10.96 cm waist circumference. These elderly women received a specific functional training protocol where their functional autonomy was assessed at three specific times (0, 10 and 20 sessions). The evaluation consisted of a set of five tests defined by the Latin-American Development Group for the Elderly (GDLAM) to determine the functional autonomy of the elderly: walk 10 meters (C10m); stand up from a chair and walk straightaway (SUCWA); dress and undress a T-shirt (DUT); stand up from a sitting position (SUSP); stand up from a lying position (SULP). In each test, the time taken to complete the task was measured. RESULTS: There were statistically significant differences in all functional autonomy tests after 20 training sessions: C10m (pre: 8.10±1.27; post: 7.55±1.10); SUCWA (pre: 40.98±2.77; post: 38.44±2.57); DUT (pre: 13.25±0.88; post: 11.85±0.82); SUSP (pre: 10.74±0.52; post: 8.98±056) and SULP (pre: 3.86±0.37; post: 2.82±0.37). CONCLUSIONS: It was determined that 20 functional training sessions were enough to improve the functional autonomy of elderly women. However, we believe that higher volume and intensity of training could be interesting alternatives for even stronger results in future interventions.

Effects of intra-set rest on the ability to repeat work at maximal isometric strength.

BACKGROUND: The aim of this paper was to analyze how the rest between interval repetitions in intra-set training (at maximal isometric loads) could affect the ability to repeat maximal contractions in subjects with different levels of performance and different experience in strength development work. METHODS: Twenty subjects were divided randomly into two different groups depending on their sport characteristics: ten subjects were trained in strength development work (Group Strenght--23.1±4.6 years; 172.0±5.3 cm; 79.9±12.1 kg; 2175.6±490.8 N; 46.9±4.9 mL/kg.min), and ten subjects were trained in endurance work (Group Endurance--21.3±4.5 years; 172.4±4.1 cm; 60.0±4.6 kg; 815.5±206.5 N; 67.4±4.9 mL/kg.min). To assess the ability to repeat maximal efforts, 20 repetitions of 5 seconds were performed in a half-squat position, with 1 minute of rest between repetitions. RESULTS: For both groups, four different phases were observed in the Interval Maximal Force test during the 20-repetition assessment: potentiation, maintenance, moderate loss, and significant loss. For the GE, the loss in maximum strength capacity began in the fourth repetition (GS4th: 3.4%, ns, Effect Size: 0.09 vs. GE3th: 1.6%; ns; ES: 0.06) and reached a statistically significant value in the twelfth repetition (GS12th: 12.7%, P=0.03, ES: 0.35 vs. GE7th: 12.5%; P=0.01; ES: 0.49). The number of repetitions at which the strength began to decrease depended on the subject's sport characteristic and performance level. CONCLUSIONS: This study shows how an appropriate intra-set rest inclusion can significantly increase the work performed in every set without changing the muscle contraction characteristics, thus delaying muscle fatigue and maintaining the desired training objective.

Single- and multiple-set resistance training improves skeletal and respiratory muscle strength in elderly women.

INTRODUCTION: Aging involves a progressive reduction of respiratory muscle strength as well as muscle strength. PURPOSE: Compare the effects of resistance training volume on the maximum inspiratory pressure (MIP), maximum expiratory pressure (MEP), functional performance, and muscle strength in elderly women. METHODS: Thirty elderly women were randomly assigned to a group performing either single sets (1-SET) or three sets (3-SET) of exercises. The sit-to-stand test, MIP, MEP, and muscle strength were assessed before and after 24 training sessions. Progressive resistance training was performed two times per week for a total of 8-12 repetitions, using the main muscle groups of the upper and lower limbs. RESULTS: The main results showed that the participants significantly increased their MEP (P<0.05; 1-SET: 34.6%; 3-SET: 35.8%) and MIP (P<0.05; 1-SET: 13.7%; 3-SET: 11.2%). Both groups also improved in the sit-to-stand test (P<0.05; 1-SET: 10.6%; 3-SET: 17.1%). After 24 training sessions, muscle strength also significantly increased (P<0.0001; 40%-80%) in both groups. An intergroup comparison did not show any statistically significant differences between the groups in any of the parameters analyzed. CONCLUSION: Single- and multiple-set resistance training programs increased MIP, MEP, muscle strength, and sit-to-stand test performance in elderly women after 24 sessions of training. In conclusion, our results suggested that elderly women who are not in the habit of physical activity may start with single-set resistance training programs as a short-term strategy for the maintenance of health.