Publications

• 2019

  • Jenkins NDM, Miramonti AA, Hill EC, Smith CM, Cochrane-Snyman KC, Housh TJ, Cramer JT. Mechanomyographic Amplitude Is Sensitive to Load-Dependent Neuromuscular Adaptations in Response to Resistance Training. J Strength Cond Res. 2019 Aug 23. doi: 10.1519/JSC.0000000000003276. [Epub ahead of print]​

  • Tomko PM, Colquhoun RJ, Banks NF, Magrini MA, Muddle TWD, Jenkins NDM. Maximal contraction methods influence the magnitude and reliability of global electromyographic signal characteristics. J Electromyogr Kinesiol. 2019 Oct;48:121-127. doi: 10.1016/j.jelekin.2019.07.002. Epub 2019 Jul 6​

  • DeFreitas JM. In regards to motor unit decomposition, are we caring about the right information? J Electromyogr Kinesiol. 2019 May 2. pii: S1050-6411(19)30164-6. doi: 10.1016/j.jelekin.2019.05.001. [Epub ahead of print]

  • Barrera Curiel A, Colquhoun RJ, Hernandez-Sarabia J, DeFreitas JM. The effects of vibration-induced altered stretch reflex sensitivity on maximal motor unit firing properties. J Neurophysiol. 2019 Apr 10. doi: 10.1152/jn.00326.2018. [Epub ahead of print] 

  • Carr JC, Ye X, Stock MS, Bemben MG, DeFreitas JM. The time course of cross-education during short-term isometric strength training. Eur J Appl Physiol. 2019 Apr 4. doi: 10.1007/s00421-019-04130-9. [Epub ahead of print]

  • Hester GM, Magrini MA, Colquhoun RJ, Barrera-Curiel A, Estrada CA, Olmos AA, Bailly AR, Ha PL, DeFreitas JM. Cross-education: effects of age on rapid and maximal voluntary contractile characteristics in males. Eur J Appl Physiol. 2019 Mar 14. doi: 10.1007/s00421-019-04123-8. [Epub ahead of print]

  • Muddle TWD, Magrini MA, Colquhoun RJ, Luera MJ, Tomko PM, Jenkins NDM. Impact of Fatiguing, Submaximal High- vs. Low-Torque Isometric Exercise on Acute Muscle Swelling, and Echo Intensity in Resistance-Trained Men. J Strength Cond Res. 2019 Apr;33(4):1007-1019. doi: 10.1519/JSC.0000000000003033.

  • Moghaddam M, Estrada CA, Muddle TWD, Magrini MA, Jenkins NDM, Jacobson BH. Similar Anaerobic and Aerobic Adaptations After 2 High-Intensity Interval Training Configurations: 10 s: 5 s vs. 20 s: 10 s Work-to-Rest Ratio. J Strength Cond Res. 2019 Feb 27. doi: 10.1519/JSC.0000000000002939. [Epub ahead of print]

  • Hester GM, Pope ZK, Magrini MA, Colquhoun RJ, Curiel AB, Estrada CA, Olmos AA, DeFreitas JM. Age Does Not Attenuate Maximal Velocity Adaptations in the Ipsilateral and Contralateral Limbs During Unilateral Resistance Training. J Aging Phys Act. 2019 Feb 27:1-8. doi: 10.1123/japa.2017-0297.

• 2018

  • Colquhoun RJ, Tomko PM, Magrini MA, Muddle TWD, Jenkins NDM. The influence of input excitation on the inter- and intra-day reliability of the motor unit firing rate versus recruitment threshold relationship. J Neurophysiol. 2018 Oct 24. doi: 10.1152/jn.00490.2018. [Epub ahead of print]​

  • Jenkins NDM, Colquhoun RJ, Tomko PM, Gradnigo T, Magrini MA, Muddle TWD, Fleming S, Ferrell M, El-Sohemy A. Genetic variant in the β2 -adrenergic receptor (Arg16Gly) influences fat-free mass, muscle strength and motor unit behaviour in young men.Exp Physiol. 2018 Dec;103(12):1645-1655. doi: 10.1113/EP087145.

  • Tomko PM, Muddle TW, Magrini MA, Colquhoun RJ, Luera MJ, Jenkins ND. Reliability and differences in quadriceps femoris muscle morphology using ultrasonography: The effects of body position and rest time. Ultrasound. 2018 Nov; 26(4):214-221. doi: 10.1177/1742271X18780127. 

  • Tomko PM, Colquhoun RJ, Magrini MA, Muddle TWD, Jenkins NDM. Global electromyographic signal characteristics depend on maximal isometric contraction method in the knee extensors. J Electromyogr Kinesiol. 2018 Jul 10;42:111-116. doi: 10.1016/j.jelekin.2018.07.002. [Epub ahead of print] 

  • Mackey CS, Thiele RM, Conchola EC, DeFreitas JM. Comparison of fatigue responses and rapid force characteristics between explosive- and traditional-resistance-trained males. Eur J Appl Physiol. 2018 May 14. doi: 10.1007/s00421-018-3883-2. [Epub ahead of print]

  • Muddle TWD, Colquhoun RJ, Magrini MA, Luera MJ, DeFreitas JM, Jenkins NDM. Effects of fatiguing, submaximal high- versus low-torque isometric exercise on motor unit recruitment and firing behavior. Physiol Rep. 2018 May; 6(8). doi: 10.14814/phy2.13675.

  • Luera MJ, Dowling B, Magrini MA, Muddle TWD, Colquhoun RJ, Jenkins NDM. Role of Rotational Kinematics in Minimizing Elbow Varus Torques for Professional Versus High School Pitchers. Orthop J Sports Med. 2018 Mar 20;6(3), doi: 10.1177/2325967118760780.
    

  • Colquhoun RJ, Magrini MA, Haun CT, Muddle TWD, Tomko PM, Luera MJ, Mackey CS, Vann CG, Martin JS, Young KC, DeFreitas JM, Roberts MD, Jenkins NDM. Muscle phenotype is related to motor unit behavior of the vastus lateralis during maximal isometric contractions. Physiol Rep. 2018 Mar;6(5). doi: 10.14814/phy2.13636.

  • Hester GM, Pope ZK, Magrini MA, Colquhoun RJ, Curiel AB, Estrada CA, Olmos AA, DeFreitas JM. Age Does Not Attenuate Maximal Velocity Adaptations in the Ipsilateral and Contralateral Limbs During Unilateral Resistance Training. J Aging Phys Act. 2018 Feb 27:1-28. doi: 10.1123/japa.2017-0297.

  • Magrini MA, Thiele RM, Colquhoun RJ, Barrera Curiel A, Blackstock TS, DeFreitas JM. The Reactive Leg Drop: a Simple and Novel Sensory-Motor Assessment to Predict Fall Risk in Older Individuals . J Neurophysiol. 2018 Jan 10. doi: 10.1152/jn.00713.2017.​

  • Magrini MA, Colquhoun RJ, Barrera Curiel A, Thiele RM, DeFreitas JM, Smith DB, Jenkins NDM. Muscle size, strength, power, and echo intensity, but not specific tension, are affected by age in physically active adults. Isokinet Exerc Sci. 2018 Jan, doi: 10.3233/IES-172194.

  • Colquhoun RJ, Gai CM, Aguilar D, Bove D, Dolan J, Vargas A, Couvillion K, Jenkins NDM, Campbell BI. Training Volume, Not Frequency, Indicative of Maximal Strength Adaptations to Resistance Training. J Strength Cond Res. 2018 Jan 5. doi: 10.1519/JSC.0000000000002414. [Epub ahead of print]

• 2017

  • Haun CT, Mumford PW, Roberson PA, Romero MA, Mobley CB, Kephart WC, Anderson RG, Colquhoun RJ, Muddle TWD, Luera MJ, Mackey CS, Pascoe DD, Young KC, Martin JS, DeFreitas JM, Jenkins NDM, Roberts MD.  Molecular, neuromuscular, and recovery responses to light versus heavy resistance exercise in young men. Physiol Rep. 2017 Sep;5(18). doi: 10.14814/phy2.13457.
    

  • Martin JS, Mumford PW, Haun CT, Luera MJ, Muddle TWD, Colquhoun RJ, Feeney MP, Mackey CS, Roberson PA, Young KC, Pascoe DD, DeFreitas JM, Jenkins NDM, Roberts MD.  Effects of a pre-workout supplement on hyperemia following leg extension resistance exercise to failure with different resistance loads. J Int Soc Sports Nutr. 2017 Sep 26;14:38. doi: 10.1186/s12970-017-0195-6.

  • Palmer TB, Jenkins NDM, Thompson BJ, Cramer JT.  Influence of stretching velocity on musculotendinous stiffness of the hamstrings during passive straight-leg raise assessments. Musculoskelet Sci Pract. 2017 Aug;30:80-85. doi: 10.1016/j.msksp.2016.12.018. Epub 2017 Jan 5.​

  • Jenkins NDM, Miramonti AA, Hill EC, Smith CM, Cochrane-Snyman KC, Housh TJ, Cramer JT. Greater Neural Adaptations following High- vs. Low-Load Resistance Training, Front Physiol. 2017 May 29;8:331. doi: 10.3389/fphys.2017.00331.

  • Stock MS, Mota JA, DeFranco RN, Grue KA, Jacobo AU, Chung E, Moon JR, DeFreitas JM, Beck TW. The time course of short-term hypertrophy in the absence of eccentric muscle damage. Eur J Appl Physiol. 2017 May;117(5):989-1004. doi: 10.1007/s00421-017-3587-z.

  • Jenkins NDM, Cramer JT. Reliability and Minimum Detectable Change for Common Clinical Physical Function Tests in Sarcopenic Men and Women. J Am Geriatr Soc. 2017 Apr;65(4):839-846. doi: 10.1111/jgs.14769.​

  • Hester GM, Pope ZK, Sellers JH, Thiele RM, DeFreitas JM. Potentiation: Effect of ballistic and heavy exercise on vertical jump performance.  J Strength Cond Res. 2017 Mar;31(3):660-666. doi: 10.1519/JSC.0000000000001285.

• 2016

  • Pope ZK, Hester GM, Benik FM, DeFreitas JM. Action potential amplitude as a noninvasive indicator of motor unit-specific hypertrophy. J Neurophysiol. 2016 May 1;115(5):2608-14, doi: 10.1152/jn.00039.2016.​​

  • Smith CM, Housh TJ, Herda TJ, Zuniga JM, Camic CL, Bergstrom HC, Smith DB, Weir JP, Hill EC, Cochrane KC, Jenkins ND, Schmidt RJ, Johnson GO. Time Course of Changes in Neuromuscular Parameters During Sustained Isometric Muscle Actions. J Strength Cond Res. 2016 Oct;30(10):2697-270, doi: 10.1519/JSC.0000000000001547.

  • Jenkins ND, Housh TJ, Buckner SL, Bergstrom HC, Cochrane KC, Hill EC, Smith CM, Schmidt RJ, Johnson GO, Cramer JT. Neuromuscular Adaptations After 2 and 4 Weeks of 80% Versus 30% 1 Repetition Maximum Resistance Training to Failure. J Strength Cond Res. 2016 Aug;30(8):2174-85, doi: 10.1519/JSC.0000000000001308.

  • Jenkins ND. Are Resistance Training-Mediated Decreases in Ultrasound Echo Intensity Caused by Changes in Muscle Composition, or Is There an Alternative Explanation? Ultrasound Med Biol. 2016 Aug 30. pii: S0301-5629(16)30170-3. doi: 10.1016/j.ultrasmedbio.2016.07.011. [Epub ahead of print] 

  • Jenkins ND, Housh TJ, Miramonti AA, McKay BD, Yeo NM, Smith CM, Hill EC, Cochrane KC, Cramer JT. Effects of rumenic acid rich conjugated linoleic acid supplementation on cognitive function and handgrip performance in older men and women. Exp Gerontol. 2016 Nov;84:1-11, doi: 10.1016/j.exger.2016.08.004. 

  • DeFreitas JM, Beck TW, Stock MS. The findings of Damas et al. have not influenced the previously proposed time course of skeletal muscle hypertrophy. Eur J Appl Physiol. 2016 Feb;116(2):443-4​, doi: 10.1007/s00421-015-3286-6.

  • Schoenfeld BJ, Pope ZK, Benik FM, Hester GM, Sellers J, Nooner JL, Schnaiter JA, Bond-Williams KE, Carter AS, Ross CL, Just BL, Henselmans M, Krieger JW. Longer Interset Rest Periods Enhance Muscle Strength and Hypertrophy in Resistance-Trained Men. J Strength Cond Res. 2016 Jul;30(7):1805-12, doi: 10.1519/JSC.0000000000001272.

  • Sellers JH, Monaghan TP, Schnaiter JA, Jacobson BH, Pope ZK. Efficacy of a Ventilatory Training Mask to Improve Anaerobic and Aerobic Capacity in Reserve Officers' Training Corps Cadets. J Strength Cond Res. 2016 Apr;30(4):1155-60, doi: 10.1519/JSC.0000000000001184.

  • Palmer TB, Thiele RM, Conchola EC, Smith DB, Thompson BJ. A Preliminary Study of the Utilization of Maximal and Rapid Strength Characteristics to Identify Chair-Rise Performance Abilities in Very Old Adults. J Geriatr Phys Ther. 2016 Jul-Sep;39(3):102-9, doi: 10.1519/JPT.0000000000000060.
    

• 2015

  • Pope ZK, DeFreitas JM. The effects of acute and prolonged muscle vibration on the function of the muscle spindle's reflex arc. Somatosens Mot Res. 2015;32(4):254-61, doi: 10.3109/08990220.2015.1091770.
    

  • Jenkins ND, Housh TJ, Bergstrom HC, Cochrane KC, Hill EC, Smith CM, Johnson GO, Schmidt RJ, Cramer JT. Muscle activation during three sets to failure at 80 vs. 30% 1RM resistance exercise.  Eur J Appl Physiol. 2015 Nov;115(11):2335-47, doi: 10.1007/s00421-015-3214-9​.

  • Ye X, Beck TW, DeFreitas JM, Wages NP. Acute effects of dynamic exercises on the relationship between the motor unit firing rate and the recruitment threshold. Hum Mov Sci. 2015 Apr;40:24-37, doi: 10.1016/j.humov.2014.11.011.​

  • Cramer JT, Jenkins ND, Mustad VA, Weir JP. Isokinetic Dynamometry in Healthy Versus Sarcopenic and Malnourished Elderly: Beyond Simple Measurements of Muscle Strength. J Appl Gerontol. 2015 May 5. pii: 0733464815584669. [Epub ahead of print] 

  • Jenkins ND, Miller JM, Buckner SL, Cochrane KC, Bergstrom HC, Hill EC, Smith CM, Housh TJ, Cramer JT. Test-Retest Reliability of Single Transverse versus Panoramic Ultrasound Imaging for Muscle Size and Echo Intensity of the Biceps Brachii. Ultrasound Med Biol. 2015 Jun;41(6):1584-91, doi: 10.1016/j.ultrasmedbio.2015.01.017.

  • Pope ZK, DeFreitas JM. The effects of body position and muscle activation on patellar tendon reflex properties. Physiol Meas. 2015 Jul;36(7):1429-38, doi: 10.1088/0967-3334/36/7/1429.

  • Jenkins ND, Housh TJ, Palmer TB, Cochrane KC, Bergstrom HC, Johnson GO, Schmidt RJ, Cramer JT. Relative differences in strength and power from slow to fast isokinetic velocities may reflect dynapenia. Muscle Nerve. 2015 Jul;52(1):120-30​, doi: 10.1002/mus.24505.

  • Beck TW, Simmons JL, DeFreitas JM. EMG spectral differences among the quadriceps femoris during the stretch reflex. Muscle Nerve. 2015 Nov;52(5):826-31, doi: 10.1002/mus.24625.

  • Conchola EC, Thiele RM, Palmer TB, Smith DB, Thompson BJ. Acute Postexercise Time Course Responses of Hypertrophic vs. Power-Endurance Squat Exercise Protocols on Maximal and Rapid Torque of the Knee Extensors. J Strength Cond Res. 2015 May;29(5):1285-94, doi: 10.1519/JSC.0000000000000692.

  • Palmer TB, Thiele RM, Williams KB, Adams BM, Akehi K, Smith DB, Thompson BJ.The identification of fall history using maximal and rapid isometric torque characteristics of the hip extensors in healthy, recreationally active elderly females: a preliminary investigation. Aging Clin Exp Res. 2015 Aug;27(4):431-8, doi: 10.1007/s40520-014-0305-0. 

  • Thiele RM, Conchola EC, Palmer TB, DeFreitas JM, Thompson BJ. The effects of a high-intensity free-weight back-squat exercise protocol on postural stability in resistance-trained males. J Sports Sci. 2015;33(2):211-8, doi: 10.1080/02640414.2014.934709. 

  • Palmer TB, Akehi K, Thiele RM, Smith DB, Thompson BJ. Reliability of panoramic ultrasound imaging in simultaneously examining muscle size and quality of the hamstring muscles in young, healthy males and females. Ultrasound Med Biol. 2015 Mar;41(3):675-84, doi: 10.1016/j.ultrasmedbio.2014.10.011.

  • Conchola EC, Thiele RM, Palmer TB, Smith DB, Thompson BJ. Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women. Muscle Nerve. 2015 Nov;52(5):844-51, doi: 10.1002/mus.24598.

  • Palmer TB, Akehi K, Thiele RM, Smith DB, Warren AJ, Thompson BJ. Dorsiflexion, plantar-flexion, and neutral ankle positions during passive resistance assessments of the posterior hip and thigh muscles.  J Athl Train. 2015 May;50(5):467-74, doi: 10.4085/1062-6050-49.6.04.

  • Palmer TB, Hawkey MJ, Thiele RM, Conchola EC, Adams BM, Akehi K, Smith DB, Thompson BJ. The influence of athletic status on maximal and rapid isometric torque characteristics and postural balance performance in Division I female soccer athletes and non-athlete controls. Clin Physiol Funct Imaging. 2015 Jul;35(4):314-22, doi: 10.1111/cpf.12167.
    

• 2014

  • Jenkins ND, Housh TJ, Traylor DA, Cochrane KC, Bergstrom HC, Lewis RW, Schmidt RJ, Johnson GO, Cramer JT. The rate of torque development: a unique, non-invasive indicator of eccentric-induced muscle damage? Int J Sports Med. 2014 Dec;35(14):1190-5, doi: 10.1055/s-0034-1375696.

  • DeFreitas JM, Beck TW, Ye X, Stock MS. Synchronization of low- and high-threshold motor units. Muscle Nerve. 2014 Apr;49(4):575-83, doi: 10.1002/mus.23978.

  • Hester GM, Conchola EC, Thiele RM, DeFreitas JM. Power output during a high-volume power-oriented back squat protocol. J Strength Cond Res. 2014 Oct;28(10):2801-5, doi: 10.1519/JSC.0000000000000484.

  • Jenkins ND, Buckner SL, Bergstrom HC, Cochrane KC, Goldsmith JA, Housh TJ, Johnson GO, Schmidt RJ, Cramer JT. Reliability and relationships among handgrip strength, leg extensor strength and power, and balance in older men. Exp Gerontol. 2014 Oct;58:47-50, doi: 10.1016/j.exger.2014.07.007.

  • Jenkins ND, Buckner SL, Cochrane KC, Bergstrom HC, Palmer TB, Johnson GO, Schmidt RJ, Housh TJ, Cramer JT. Age-related differences in rates of torque development and rise in EMG are eliminated by normalization. Exp Gerontol. 2014 Sep;57:18-28, doi: 10.1016/j.exger.2014.04.015.
    

  • Ye X, Beck TW, DeFreitas JM, Wages NP. An examination of the strength and electromyographic responses after concentric vs. eccentric exercise of the forearm flexors. J Strength Cond Res. 2014 Apr;28(4):1072-80, doi: 10.1519/JSC.0000000000000251. 

  • Beck TW, Stock MS, DeFreitas JM. Torque-related changes in mechanomyographic intensity patterns for the superficial quadriceps femoris muscles. Comput Methods Biomech Biomed Engin. 2014 May;17(7):714-22, doi: 10.1080/10255842.2012.715155.
    

  • Jenkins ND, Palmer TB, Cramer JT. Comparing the reliability of voluntary and evoked muscle actions. Clin Physiol Funct Imaging. 2014 Nov;34(6):434-41, doi: 10.1111/cpf.12113.
    

  • Palmer TB, Thompson BJ, Hawkey MJ, Conchola EC, Adams BM, Akehi K, Thiele RM, Smith DB. The influence of athletic status on the passive properties of the muscle-tendon unit and traditional performance measures in division I female soccer players and nonathlete controls. J Strength Cond Res. 2014 Jul;28(7):2026-34, doi: 10.1519/JSC.0000000000000332.

  • Beck TW, Stock MS, DeFreitas JM. Shifts in EMG spectral power during fatiguing dynamic contractions. Muscle Nerve. 2014 Jul;50(1):95-102, doi: 10.1002/mus.24098.
    

• Earlier Selected Publications

  • Beck TW, Kasishke PR 2nd, Stock MS, DeFreitas JM. Eccentric exercise does not affect common drive in the biceps brachii. Muscle Nerve. 2012 Nov;46(5):759-66. doi: 10.1002/mus.23386.
    

  • Beck TW, Stock MS, DeFreitas JM. Effects of fatigue on intermuscular common drive to the quadriceps femoris. Int J Neurosci. 2012 Oct;122(10):574-82​, doi: 10.3109/00207454.2012.693997.

  • Beck TW, Kasishke PR 2nd, Stock MS, DeFreitas JM. Neural contributions to concentric vs. eccentric exercise-induced strength loss. J Strength Cond Res. 2012 Mar;26(3):633-40​, doi: 10.1519/JSC.0b013e3182474296.

  • Stock MS, Beck TW, DeFreitas JM. Effects of fatigue on motor unit firing rate versus recruitment threshold relationships. Muscle Nerve. 2012 Jan;45(1):100-9​, doi: 10.1002/mus.22266.

  • DeFreitas JM, Beck TW, Stock MS, Dillon MA, Kasishke PR 2nd. An examination of the time course of training-induced skeletal muscle hypertrophy. Eur J Appl Physiol. 2011 Nov;111(11):2785-90, doi: 10.1007/s00421-011-1905-4.
    

  • Beck TW, DeFreitas JM, Stock MS, Dillon MA. Effects of resistance training on force steadiness and common drive. Muscle Nerve. 2011 Feb;43(2):245-50​, doi: 10.1002/mus.21836.

  • DeFreitas JM, Costa PB, Ryan ED, Herda TJ, Cramer JT, Beck TW. An examination of innervation zone movement with increases in isometric torque production. Clin Neurophysiol. 2008 Dec;119(12):2795-9, doi: 10.1016/j.clinph.2008.09.021.