Jenkins, NDM, Housh, TJ, Buckner, SL, Bergstrom, HC, Cochrane, KC, Hill, EC, Smith, CM, Schmidt, RJ, Johnson, GO, and Cramer, JT. Neuromuscular adaptations after 2 4 weeks of 80% versus 30% 1 repetition maximum resistance training to failure. J Strength Cond Res 30(8): 2174-2185, 2016-The purpose this study was investigate the hypertrophic, strength, neuromuscular at 80 vs. (1RM) in untrained men. Fifteen men (mean ± SD; age = 21.7 2.4 years; weight 84.7 23.5 kg) were randomly assigned...

Estimates of critical power (CP) and anaerobic work capacity (AWC) from the output vs. time relationship have been derived various mathematical models. The purpose this study was to examine estimates CP AWC multiple bout, 2- 3-parameter models, those 3-minute all-out (CP3min) test. Nine college-aged subjects performed a maximal incremental test determine peak oxygen consumption rate gas exchange threshold. On separate days, each subject completed 4 randomly ordered constant rides exhaustion...

Critical power (CP) from the 3-min test was compared to outputs associated with thresholds determined gas exchange parameters that have been used demarcate exercise-intensity domains including respiratory compensation point (RCP), threshold (GET), and ventilatory (VT).Twenty-eight participants performed an incremental-cycle ergometer exhaustion. The VT relationship between equivalent for oxygen uptake (VE/VO2) versus VO2 GET using V-slope method (VCO2 vs. VO2). RCP identified VE-versus-VCO2...

The purpose of this study was to develop a 3-minute, all-out test protocol using the Monark cycle ergometer for estimating critical power (CP) and anaerobic work capacity (AWC) with resistance based on body weight. Twelve moderately trained adults (mean age ± SD = 23.2 3.5 years) performed an incremental exhaustion. CP AWC were estimated from original limit (W(lim)) vs. time (T(lim)) relationship (CP(PT)) 3-minute (CP(3min)) against fixed compared new tests (CP(3.5%) CP(4.5%)). values...

The use of chain or elastic band-resisted variable resistance has become popular in the training athletes. A number studies have investigated utilization vs. traditional on both acute and chronic performance measures. However, mechanisms observed outcome measures are not fully understood. This review aims to propose a four-part theory regarding bases by which band-based been shown be effective. Additionally, it compares methodologies utilizing provides practitioners with recommendations...

Outdoor play environments such as playgrounds provide opportunities for children to develop language, social-emotional, cognitive, and motor skills through interactions with peers adults. Traditionally, direct observation has been used measure child teacher talk on the playground. In this proof-of-concept study, we sensing technology tools, namely Ubisense Language ENvironmental Analysis (LENA), capture examine among young educators an early childhood center We collected over 28,000 1-s...

The application of the rating perceived exertion (RPE)-clamp model has allowed for examination unique physio-psychological fatigue mechanisms in humans. This study examined time course composite and inter-individual responses force, electromyographic (EMG) mechanomyographic (MMG) amplitude (AMP) mean power frequency (MPF), neuromuscular efficiency (NME) during a sustained, isometric handgrip hold to failure (HTF) anchored RPE 5 (RPE=5) on 0-10 omnibus-resistance scale females. Twelve females...

Kwak, M, Benitez, B, Succi, PJ, Mitchinson, CJ, and Bergstrom, HC. Intensity-dependent effects of unilateral, fatiguing, isometric muscle contractions on ipsilateral contralateral muscular performance in female subjects. J Strength Cond Res XX(X): 000-000, 2025-This study examined time to task failure (TTF), fatigability (PF), cross-over the contralateral, unexercised hand after unilateral handgrip holds (HTF) at 40 60% maximal voluntary (MVIC). Ten subjects completed a pre-MVIC both hands,...

Abstract Lesniak, AY, Bergstrom, HC, Clasey, JL, Stromberg, AJ, and Abel, MG. The effect of personal protective equipment on firefighter occupational performance. J Strength Cond Res 34(8): 2165–2172, 2020—The purpose this study was to evaluate the effects load carriage (LC) LC plus respirator use (LC + self-contained breathing apparatus [SCBA]) firefighters' work capacity enhance our understanding demands. Twenty-one male structural recruits (age: 28.6 ± 4.3 years; height: 178.6 7.2 cm;...

Abstract Dinyer, TK, Byrd, MT, Garver, MJ, Rickard, AJ, Miller, WM, Burns, S, Clasey, JL, and Bergstrom, HC. Low-load vs. high-load resistance training to failure on one repetition maximum strength body composition in untrained women. J Strength Cond Res 33(7): 1737–1744, 2019—This study examined the effects of (RT) at low high loads (1RM) (bone- fat-free mass [BFFM] percent fat [%BF]) Twenty-three women (age: 21.2 ± 2.2 years; height: 167.1 5.7 cm; mass: 62.3 16.2 kg) completed a 12-week RT...

Abstract Mason, MR, Heebner, NR, Abt, JP, Bergstrom, HC, Shapiro, R, Langford, EL, and Abel, MG. The acute effect of high-intensity resistance training on subsequent firefighter performance. J Strength Cond Res 37(7): 1507–1514, 2023—High-intensity (HIRT) is commonly performed by structural firefighters duty to enhance occupational readiness. However, exercise-induced fatigue may negatively impact Therefore, the purpose this study was assess HIRT physical ability in determine time course...

This study examined the time courses of recovery for isometric peak torque and rate development (RTD) after eccentric-induced muscle damage. 18 men completed 6 sets 10 maximal eccentric isokinetic actions at 30° · s⁻¹. Peak torque, RTD (RTD10), 50 (RTD50), 100 (RTD100) 200 ms (RTD200), serum creatine kinase lactate dehydrogenase were measured before (PRE), immediately (POST), 24, 48 72 h exercise. Creatine increased from 139 to 457 116 199 IU L⁻¹ PRE h, respectively....

Abstract The purpose of the present study was to examine oxygen consumption rate ([Vdot]), heart (HR), and ratings perceived exertion (RPE) responses, as well time exhaustion (Tlim) values during continuous rides at critical power (CP) determined from 3-min all-out test. Eighteen participants (mean ± s: 23.6 3.5 years; 72.7 18.2 kg) performed an incremental cycle ergometer test determine peak ([Vdot] peak) HR peak. Critical Metabolic responses rate), RPE, Tlim were recorded CP. Linear...

Bergstrom, HC, Byrd, MT, Wallace, BJ, and Clasey, JL. Examination of a multi-ingredient preworkout supplement on total volume resistance exercise subsequent strength power performance. J Strength Cond Res 32(6): 1479-1490, 2018-This study examined the acute effects (a) total-, lower-, upper-body (b) lower-body (isokinetic leg extension flexion), (vertical jump [VJ] height), (bench throw velocity [BTv]), cycle ergometry performance (critical anaerobic work capacity). Twelve men completed...

Abstract Langford, EL, Bergstrom, HC, Lanham, S, Eastman, AQ, Best, Ma, X, Mason, MR, and Abel, MG. Evaluation of work efficiency in structural firefighters. J Strength Cond Res 37(12): 2457–2466, 2023—To perform occupational tasks safely effectively, firefighters (FF) must quickly consume air provided by the self-contained breathing apparatus (SCBA) efficiently. However, most literature only factors rate into performance, neglecting inherent time limitation imposed SCBA. The purpose this...

The purpose of this study was to examine mean differences and the patterns responses for oxygen uptake ([Formula: see text]O 2 ), heart rate (HR), rating perceived exertion (RPE) ramp (15 W·min –1 ) versus step (30 W increments every min) incremental cycle ergometer tests. Fourteen subjects (age body mass 23.2 ± 3.1 (mean SD years 71.1 10.1 kg, respectively) visited laboratory on separate occasions. Two-way repeated measures ANOVAs with appropriate follow-up procedures, as well paired t...

This study examined the relationships among physical working capacity at fatigue threshold (PWCFT), power outputs associated with gas exchange (PGET) and respiratory compensation point (PRCP), critical (CP) to identify possible physiological mechanisms underlying onset of neuromuscular fatigue. Ten participants (mean ± SD age: 20 1 years) performed a maximal incremental cycle ergometer test determine PWCFT, PGET, PRCP. CP was determined from 3 min all-out test. The PWCFT (197 55 W), PRCP...

Jenkins, NDM, Buckner, SL, Baker, RB, Bergstrom, HC, Cochrane, KC, Weir, JP, Housh, TJ, and Cramer, JT. Effects of 6 weeks aerobic exercise combined with conjugated linoleic acid on the physical working capacity at fatigue threshold. J Strength Cond Res 28(8): 2127–2135, 2014—The purpose this study was to examine effects (CLA) supplementation in conjunction training threshold (PWCFT), timed sit-ups, standing long jump. Thirty-three untrained moderately trained men (mean ± SD; age = 21.6 2.8...