The electromyographic threshold in boys and men

Pitt, Brynlynn; Dotan, Raffy; Millar, Jordan; Long, Devon; Tokuno, Craig D.; O’Brien, Thomas D.; Falk, Bareket

doi:10.1007/s00421-015-3100-5

Cited by 35 publications

(21 citation statements)

References 38 publications

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“…In this regard, it is known that the electromyographic (EMG) threshold may be detected during incremental exercise, and the EMG threshold is defined as a nonlinear increase or upward inflection of EMG signals with increase in exercise intensity (Lucía et al ., ; Osawa et al ., ; Crozara et al ., ; Pitt et al ., ). It has been reported that the EMG threshold for the m. vastus lateralis was identified in 90%–100% of the subjects in cycling, which has a constant movement pattern (Lucía et al ., ; Osawa et al ., ; Pitt et al ., ), while the corresponding value in treadmill running was 54% (Crozara et al ., ). Therefore, we suspect that the absence of the point of accelerated decrease in Δ[Oxy‐Hb − Deoxy‐Hb] in some participants in this study might be attributable to individual differences in movement pattern while running.…”

Section: Discussionmentioning

confidence: 97%

“…In Japan, the 20mSRT is one of the physical fitness tests adopted by the Ministry of Education, Culture, Sports, Science and Technology and is conducted nationwide. It was demonstrated that children have unique physiological responses to exercise (Takagi et al ., ; Armstrong et al ., ; Pitt et al ., ) and that muscle oxygenation response during treadmill running in children is different from that in adults (Takagi et al ., ). Therefore, it is necessary to clarify the characteristics of muscle oxygenation profiles during the 20mSRT in children and its relationship with 20mSRT performance.…”

Section: Discussionmentioning

confidence: 99%

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Accelerated point of muscle deoxygenation during the 20‐m shuttle run test

Kume

Iguchi

Endoh

2017

Clin Physio Funct Imaging

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This study examined whether the point of accelerated deoxygenation of active muscle occurs during the 20-m shuttle run test (20mSRT) and, if so, whether it is associated with exercise performance in the test. Twenty-nine male subjects performed the 20mSRT, and concentration changes in oxyhaemoglobin (ΔOxy-Hb) and deoxyhaemoglobin (ΔDeoxy-Hb) in the m. vastus lateralis were measured using a portable near-infrared spectroscopy device. The difference between the relative concentration changes in ΔOxy-Hb and ΔDeoxy-Hb (Δ[Oxy-Hb - Deoxy-Hb]) was regarded as the muscle oxygenation index. Group-averaged Δ[Oxy-Hb - Deoxy-Hb] showed progressive decrease during the test. However, among the individuals, we found an accelerated point of decrease in Δ[Oxy-Hb - Deoxy-Hb] in 20 subjects, which revealed that the laps at the accelerated point correlated with the total laps (r = 0·78). These results demonstrate that the accelerated deoxygenation of active muscle occurs during the 20mSRT, but not in all cases. Our findings also indicate that if the accelerated point of muscle deoxygenation occurs, the timing of its appearance is related to 20mSRT performance.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Accelerated point of muscle deoxygenation during the 20‐m shuttle run test

Kume

Iguchi

Endoh

2017

Clin Physio Funct Imaging

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“…Previous research has suggested that PRE youth rely more on aerobic metabolism during submaximal exercise than POST youth due to their underdeveloped anaerobic system (Boisseau & Delamarche, 2000). These maturity‐related differences in the metabolic response to exercise may be observed in anaerobic, or fatigue, thresholds, which have been previously demonstrated to occur at lower absolute intensities in children when compared to adults (Anderson & Mahon, 2007; Klentrou, Nishio, Plyley, & University, 2006; Pitt et al., 2015). Furthermore, maturity status has been shown to influence the onset of systemic pulmonary and localized muscular fatigue thresholds, with fatigue thresholds occurring at higher relative intensities in PRE when compared to POST (Beyer et al., 2019).…”

Section: Introductionmentioning

confidence: 94%

Effect of somatic maturity on the aerobic and anaerobic adaptations to sprint interval training

et al. 2020

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The purpose of this study was to assess the maturity-related differences in the aerobic and anaerobic adaptations to sprint interval training (SIT) among youth male athletes. Twenty-seven youth male athletes were assessed for years from peak height velocity (PHV) and classified into prepubescent (PRE, n = 7, years from PHV = −2.21 ± 0.47 years), peripubescent (PERI, n = 10, years from PHV = 0.25 ± 0.88 years), and postpubescent (POST, n = 10, years from PHV = 2.81 ± 0.50 years) groups based on their years from estimated peak height velocity. Participants completed a ramp exercise protocol on a cycle ergometer to determine maximal aerobic power, maximal oxygen consumption (VO 2peak ), and fatigue thresholds. Following baseline, all participants completed a 4-week SIT program that consisted of eight total training sessions. During each session, participants completed repeated 20-s sprints on a cycle ergometer against a resistance of 7.5% of body mass. The number of sprints per sessions increased from four in session 1 to seven in session 7, with four sprints in session 8. Peak and mean power from sessions 1 and 8 were recorded. All participants completed a post-testing ramp exercise protocol that mirrored baseline. Maximal aerobic power increased (p < .001) across all groups from baseline (212.61 ± 57.45 W) to post-testing (223.24 ± 58.90 W); however, VO 2peak only increased in POST (3.31 ± 0.43 to 3.54 ± 0.43 L min −1 , p = .003).Similarly, GET, VT, and RCP increased in POST, with no changes in PRE or PERI.In terms of anaerobic performance, PERI and POST had significant increases in peak and mean power. POST improved aerobic and anaerobic performance following SIT, while PERI only experienced improvements in anaerobic performance. Conversely, PRE had no changes in aerobic or anaerobic performance. The adaptations to SIT appear to be influenced by the somatic maturity status. K E Y W O R D S fatigue thresholds, maturation, years from peak height velocity, youth athletes How to cite this article: Beyer KS, Stout JR, Redd MJ, et al. Effect of somatic maturity on the aerobic and anaerobic adaptations to sprint interval training.

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“…After the key study of Lucía et al, there continues to be a discrepancy in the number and interpretation of EMG breakpoints identified during incremental tests [30,31]. Remarkably, automatic methods used by most authors for EMG-threshold detection had the limitation that only one EMG breakpoint could be possibly identified [8,9,32,33]. Essentially, these methods are based on calculating all the two-segment regressions for the data, and then choosing the two-segment regression with the least residual sum of squares, thus yielding a single intersection point.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

Evaluation of the Electromyography Test for the Analysis of the Aerobic-Anaerobic Transition in Elite Cyclists during Incremental Exercise

et al. 2019

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(1) Background: The aim of this study was to investigate the validity and reliability of surface electromyography (EMG) for automatic detection of the aerobic and anaerobic thresholds during an incremental continuous cycling test using 1 min exercise periods in elite cyclists. (2) Methods: Sixteen well-trained cyclists completed an incremental exercise test (25 W/1 min) to exhaustion. Surface bipolar EMG signals were recorded from the vastus lateralis, vastus medialis, biceps femoris, and gluteus maximus, and the root mean square (RMS) were assessed. The multi-segment linear regression method was used to calculate the first and second EMG thresholds (EMGT1 and EMGT2). During the test, gas exchange data were collected to determine the first and second ventilatory thresholds (VT1 and VT2). (3) Results: Two breakpoints (thresholds) were identified in the RMS EMG vs. time curve for all muscles in 75% of participants. The two breakpoints, EMGT1 and EMGT2, were detected at around 70%–80% and 90%–95% of VO2MAX, respectively. No significant differences were found between the means of VT1 and EMGT1 for the vastii and biceps femoris muscles (p > 0.05). There were no significant differences between means of EMGT2 and VT2 (p > 0.05). (4) Conclusions: It is concluded that the multi-segment linear regression algorithm is a valid non-invasive method for analyzing the aerobic-anaerobic transition during incremental tests with 1 min stage durations.

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The electromyographic threshold in boys and men

Abstract: The boys' higher EMGTh suggests delayed and hence lesser utilization of type-II MUs in progressive exercise, compared with men. The boys-men EMGTh differences were of similar magnitude as those shown for LaTh and VeTh, further suggesting a common underlying factor.

Cited by 35 publications

References 38 publications

Accelerated point of muscle deoxygenation during the 20‐m shuttle run test

Accelerated point of muscle deoxygenation during the 20‐m shuttle run test

Effect of somatic maturity on the aerobic and anaerobic adaptations to sprint interval training

Evaluation of the Electromyography Test for the Analysis of the Aerobic-Anaerobic Transition in Elite Cyclists during Incremental Exercise

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