Figure 1 - uploaded by Gabriel Paz
Content may be subject to copyright.
Comparison of pectoralis major activity between BP modes; †significant difference vs. barbell BP (p # 0.05); BP: bench press.
Context in source publication
Similar publications
Citations
... In [9], 3 passive capacitive sensors were placed on the body to recognize and count gym exercises. Surface electromyography (sEMG) is the golden standard to investigate muscle activation in sports science, in which high quality medical grade instrument is usually used [22,79,87]. Commercial sEMG devices have also been used to recognize physical exercises, such as the upper-body exercise data set recorded with the MYO®armband in [51]. ...
While sports activity recognition is a well studied subject in mobile, wearable and ubiquitous computing, work to date mostly focuses on recognition and counting of specific exercise types. Quality assessment is a much more difficult problem with significantly less published results. In this work, we present Quali-Mat: a method for evaluating the quality of execution (QoE) in exercises using a smart sports mat that can measure the dynamic pressure profiles during full-body, body-weight exercises. As an example, our system not only recognizes that the user is doing push-ups, but also distinguishes 5 subtly different types of push-ups, each of which (according to sports science literature and professional trainers) has a different effect on different muscle groups. We have investigated various machine learning algorithms targeting the specific type of spatio-temporal data produced by the pressure mat system. We demonstrate that computationally efficient, yet effective Conv3D model outperforms more complex state-of-the-art options such as transfer learning from the image domain. The approach is validated through an experiment designed to cover 47 quantifiable variants of 9 basic exercises with 12 participants. Overall, the model can categorize 9 exercises with 98.6% accuracy / 98.6% F1 score, and 47 QoE variants with 67.3% accuracy / 68.1% F1 score. Through extensive discussions with both the experiment results and practical sports considerations, our approach can be used for not only precisely recognizing the type of exercises, but also quantifying the workout quality of execution on a fine time granularity. We also make the Quali-Mat data set available to the community to encourage further research in the area.
... For analysis, the RMS sum (VL + VM) was used to represent muscle activation of the quadriceps. The sEMG values were determined by an average of the sEMG values of three central repetitions of each set (Farias et al. 2017). Normalization was carried out using the highest peak sEMG value (Wright et al. 1999;Farias et al. 2017). ...
... The sEMG values were determined by an average of the sEMG values of three central repetitions of each set (Farias et al. 2017). Normalization was carried out using the highest peak sEMG value (Wright et al. 1999;Farias et al. 2017). All data processing was carried out in MATLAB ® (Natick, MA, USA). ...
The aim of the present study was to investigate the influence of intensity of load and cuff pressure on training volume and myoelectric activation during the knee extension exercise executed with and without blood flow restriction (BFR) to failure. Ten young men (22 ± 2 y), with at least six months of training experience, visited the laboratory on eight non-consecutive days with intervals of at least 48 hours between sessions. In the first two visits, one-repetition maximum (1RM) test and retest were performed in the unilateral knee extension exercise. In the subsequent six visits, the subjects performed resistance training sessions (4 sets to concentric failure) at different load intensities (30, or 40% of 1RM) and BFR pressures (0, 100, or 150mmHg). The restriction cuff was of 18-cm width and was positioned on the superior 1/3 of the thigh. Measures of training volume, and myoelectric activity from the vastus lateralis and vastus medialis via surface electromyographic, were recorded. During experimental sessions, it was observed that the use of BFR significantly reduced the training volume, independently of the load used. Less repetitions were performed with a restriction pressure of 150mmHg (47 ± 10) compared to 0mmHg (61 ± 15) and 100mmHg (59 ± 17), and with 30%1RM (50 ± 14) compared to 40%1RM (61 ± 15). For surface electromyography measures, no significant differences were observed between the conditions (P>0.05). In conclusion, the application of BFR to low-load knee extension exercise to failure led to lower training volume but did not influence myoelectric activity.
... In a follow-up study, van den Tillaar and Saeterbakken 5 again determined that 1RM BBP was significantly greater than DBP by approximately 19% and biceps total EMG activity was higher during DBP while triceps activity was less compared to BBP. Recently, Farias et al. 6 noted greater peak EMG activity in the triceps in BBP than DBP but greater activity in the biceps during DBP than during BBP. To date, no studies have determined the degree of EMG activity in the aforementioned muscles during an acute session comparing the BBP and DBP using the same loads. ...
Objectives: The purpose of this study was to assess differences in bench press velocity and power production with barbell and dumbbells. Design: Randomized cross-over design. Methods: College men (n = 20, age = 18-24 yrs) were measured for average and peak velocities and power during maximal effort single repetitions using barbell and bilateral dumbbells at loads equivalent to 30%, 50%, and 70% of body mass. Three repetitions were performed at each load with one-minute recovery between each repetition and 10 minutes between loads. During each repetition for each mode, average and peak velocity and power were monitored using a linear accelerometer. Results: Interclass correlation coefficients across the 3 trials for peak and average velocities were high for both barbell (ICC = 0.957 and 0.821, respectively) and dumbbells (ICC = 0.947 and 0.855, respectively). Peak power output was sig nificantly higher (p < 0.009) for barbell than dumbbells at 50% and 70% loads. Average power output was significantly different (p < 0.001) across the 3 loads but not significantly different between barbell and dumbbells (p = 0.35). Although velocity decreased as load increased, higher power outputs were produced across increases in loads. Peak power output was reached at 70% of body mass with barbell and 50% with dumbbells. Conclusion: Either barbell or bilateral dumbbell bench press exercises can be used to evaluate upper-body power with sim ilar effectiveness.
... The sEMG signal was normalized from the peak RMS of each position (i.e. standing or seated) and the average RMS of each set was expressed as a percentage relative to the peak (100%) (Enokaand Duchateau, 2016;Farias et al., 2017;Kinugasa et al., 2005). ...
Objective
The purpose of this study was to investigate the surface electromyographic (EMG) activity of the medial (GM) and lateral (GL) heads of the gastrocnemius muscle during plantar flexion performed in standing or seated positions, and with a neutral or dorsiflexed ankle.
Introduction
The tríceps surae (gastrocnemius and soleus) is an essential muscle group that promotes propulsion during walking, running and tasks of daily living.
Methods
Ten male volunteers (24.5 ± 3.6 years, weight: 75.8 ± 10 kg; height: 1.74 ± 0.07 m) performed ten repetitions of plantar flexion under four different conditions: a) standing position (SP); b) standing position with passive stretch of the gastrocnemius muscle (SPS); c) seated with the knee flexed (KF); d) seated with the knee flexed and a passive stretch of the gastrocnemius (KFS).
Results
The muscle activity expressed as the root mean square (RMS) was significantly higher for the GL in the SPS versus the SP condition, while there was no difference for the GM between conditions. However, for the KF condition, GM activity was significantly higher versus the KFS condition, which was not verified for the GL.
Conclusions
Therefore, the standing position with passive stretching of the triceps surae may be more efficient in increasing the myoelectric activity of the GL. However, the sitting position without passive stretching promoted greater GM muscle recruitment. The length/tension relationship of gastrocnemius could be used as a prescription variable during rehabilitation or conditioning programs.
... Blue block represents the identification step, yellow blocks the screening step, red blocks the eligibility step, and green block the inclusion step. 10 Applied Bionics and Biomechanics [71-73, 77, 78, 81, 83-85, 89, 90, 92, 93, 95, 96, 98, 104, 106, 115], with the remaining focussing on the trunk and/or upper limb [74,76,80,82,87,94,100,102,103,106] or both the upper and lower body [79,86,88,91,97,99,101]. Bilateral recordings (involving the left and right hand side of the same muscles) were less common [71,74,77,82,86,88,90,97,98,101] than ipsilateral [72, 73, 76, 78-81, 83-85, 87, 89, 91-96, 99, 100]. ...
... The most represented activity was running, although this was assessed in a variety of conditions including overground or on treadmill, shod or barefoot, level or incline, at different speeds, and on even or uneven surfaces [83,84,89,90,92,93,95,96,111,113,116,118,123,126,127,129,130,133,136]. A lot of attention was also given to resistance training or weightlifting [78,80,81,85,86,94,97,102,103,105,108,125,128] and to cycling or handcycling [71-76, 104, 109, 112, 114, 119, 124]. Swimming is also getting increasing interest in recent years [82,87,91,106,131] as are ball sports such as softball, baseball, or cricket [98][99][100][101]. ...
In the last few decades, a number of technological developments have advanced the spread of wearable sensors for the assessment of human motion. These sensors have been also developed to assess athletes’ performance, providing useful guidelines for coaching, as well as for injury prevention. The data from these sensors provides key performance outcomes as well as more detailed kinematic, kinetic, and electromyographic data that provides insight into how the performance was obtained. From this perspective, inertial sensors, force sensors, and electromyography appear to be the most appropriate wearable sensors to use. Several studies were conducted to verify the feasibility of using wearable sensors for sport applications by using both commercially available and customized sensors. The present study seeks to provide an overview of sport biomechanics applications found from recent literature using wearable sensors, highlighting some information related to the used sensors and analysis methods. From the literature review results, it appears that inertial sensors are the most widespread sensors for assessing athletes’ performance; however, there still exist applications for force sensors and electromyography in this context. The main sport assessed in the studies was running, even though the range of sports examined was quite high. The provided overview can be useful for researchers, athletes, and coaches to understand the technologies currently available for sport performance assessment.
... 1 The development of strength and muscle hypertrophy through rT is dependent on the manipulation of variables such as: volume, load intensity, workout frequency, rest intervals between sets, repetition velocity, and muscle action. 2 in this context, traditional set training (TS) is characterized by completing successive sets interspersed by rest periods, and then proceeding to the next exercise in a sequence. 3 additionally, other rT workout formats are characterized by manipulation of exercise order and rest intervals between sets and exercises; these methods include supersets (SS), paired sets (pS), and circuit training (cT). ...
... The iccs for the 10-rM test and retest were as follows: sessions. 2,9 after electrode positioning, impedance was verified and accepted with less than 5 kΩ. The impedance was observed between pairs of electrodes using a signal frequency of 25 hz. 10 ...
2 Biodynamic laboratory of exercise, health, and performance, castelo Branco university, rio de Janeiro, Brazil; 3 Kinesiology center of performance, Biodesp institute, rio de Janeiro, Brazil; 4 department of Kinesiology, california State university, fullerton, ca, uSa; 5 department of health and human performance, Montana State university, Billings, MT, uSa *corresponding author: Gabriel a. paz, School of physical education and Sports, rio de Janeiro federal university, avenida alberico diniz 2332, Jardim Sulacap, rio de Janeiro, a B S T r a c T BacKGrouNd: a challenging aspect of research in sports science is designing and conducting studies that simulate actual workout scenarios, especially with application to resistance training (rT). Therefore, the purpose of this study was to compare the effects of rT sessions performed in differing workout formats on myoelectric activity, strength performance, and metabolic markers (creatine kinase, lactate dehydrogenase, blood lactate) over 24, 48 and 72 hours post-workout. MeThodS: Twenty-two trained men (25.2±4.1 years, 182.1±12.3 cm and 91.2±5.9 kg) performed the following four training protocols with 10-repetition maximum loads in random order: 1) traditional set (TS): three sets were performed in succession for the barbell bench press (Bp), lat pulldown (lpd), 45° incline bench press (Bp45), seated close-grip row (Scr), triceps extension (Te) and biceps curl (Bc) on a pulley; 2) paired set (pS): three paired sets were performed as follows: Bp-lpd, Bp45-Scr, and Tc-B; 3) super-set (SS): similar to the pS protocol, but without rest between paired exercises; 4) circuit training (cT): one set of each exercise was performed sequentially three times. reSulTS: The results showed greater total volume under the SS (8063.2±2270.5 kg) protocol versus the TS (7356.8±2279.7 kg). Total work (repetitions) was also significantly greater for the SS and CT protocols versus the TS (p<0.05). coNcluSioNS: Therefore, the practitioners should consider utilizing the SS method during time-constrained periods with the goal to achieve greater training volume in time-efficient manner versus the TS, pS and cT methods.
Giriş: Günlük yaşam sırasında ağırlık kaldırmak sıklıkla kullanılmakta olup, omuz eklemi de üst ekstremitenin hareket serbestliğinin çoğundan sorumludur. Amaç: Bu çalışmada, sağlıklı bireylerde omuz ekleminin fleksiyon ve abdüksiyon hareketleri sırasında ağırlık kaldırmanın kas aktivasyonlarına farklı açı değerlerindeki etkisinin belirlenmesi amaçlanmıştır. Yöntem: Çalışma, yaş ortalaması 22.60 ± 0.44 olan 28 sağlıklı erkek bireyin katılımı ile gerçekleştirilmiştir. Bireyler ağırlıksız ve 3 kilogramlık bir ağırlık ile omuz fleksiyon ve abdüksiyon hareketi yaptığı sırada kas aktivasyonları trapezius kası üst orta ve alt parçaları ile deltoid kasının ön ve orta parçalarından yüzeyel elektromiyografi cihazı ile kaydedilmiştir. Hareketler 0-30, 0-60, 0-90, 0-120, 0-150 ve 0-180 dereceler arasında ve metronom eşliğinde yapılmıştır. Bulgular: Ağırlıksız olarak gerçekleştirilen fleksiyon ölçümlerinde tüm hareket açıklıklarında aktivitesi en fazla olan kas ön deltoid kası iken ağırlık ile gerçekleştirilen fleksiyon ölçümlerinde ise hareketin erken açılarında en aktif kasın üst trapezius, diğer açılarda ise ön deltoid kası olduğu görülmüştür. Ağırlıksız olarak gerçekleştirilen abdüksiyon ölçümlerinde ise yine erken derecelerde en aktif kas ön deltoid iken ağırlık ile gerçekleştirilen ölçümlerde ise üst trapezius kasının aktif olduğu belirlenmiştir. Sonuç ve Öneriler: Ağırlık ile veya ağırlıksız yapılan fleksiyon ve abdüksiyon hareketlerinde çalışma grubumuzda yer alan bireylerde en fazla aktivasyon gösteren kaslar, üst trapezius ve ön deltoid kasları olmaktadır. Bu kasların aktivasyonunu düzenlemeyi hedefleyen tedavilerde omuzun dirençli fleksiyon veya abdüksiyon hareketlerinin kullanımı göz önünde bulundurulabilir.
Introdução: O método pareado agonista-antagonista (PAA) consiste em estimular previamente a musculatura antagonista do grupo muscular que se deseja otimizar, aumentando a ativação neural e força dos músculos agonistas. Objetivo: Comparar o método tradicional vs PAA sobre o trabalho total (TT) e volume de treinamento (VT) no exercício cadeira extensora (CE). Métodos: Doze mulheres treinadas realizaram dois protocolos experimentais randomizados: método tradicional - quatro séries da CE até a falha concêntrica; método PAA: quatro séries de mesa flexora (MF) + CE até a falha concêntrica. Foi dado um intervalo de 30 segundos entre os dois exercícios. Resultados: Pôde-se observar diferença significativa tanto no TT como VT, para o método PAA quando comparado ao tradicional. Conclusão: Sugere-se assim que o método PAA apresenta-se como melhor estratégia para otimização do desempenho de repetições máximas se comparado ao método tradicional, além de apresentar possibilidade de redução no tempo despendido para o treinamento.
