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Chatlaong MA, Stanford DM, Miller WM, Davidson CJ, Jessee MB. Post-occlusive reactive hyperemia in habituated caffeine users: Effects of abstaining versus consuming typical doses. Clin Hemorheol Microcirc 2024:CH232036. [PMID: 38250766 DOI: 10.3233/ch-232036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
BACKGROUND Post-occlusive reactive hyperemia (PORH) typically requires caffeine abstinence. For habitual users, it is unknown if abstinence affects PORH. OBJECTIVE Compare PORH after habitual users consume or abstain from caffeine. METHODS On separate visits (within-subject), PORH was measured in 30 participants without abstinence from typical caffeine doses (CAFF) and with abstinence (ABS). Measurements included baseline and peak hyperemic velocity, tissue saturation index slopes during ischemia (Slope 1) and following cuff deflation (Slope 2), resting arterial occlusion pressure (AOP), heart rate (HR), systolic (SBP), and diastolic (DBP) blood pressure. All variables were compared using Bayesian paired t-tests. BF10 = likelihood of alternative vs null. Results are mean±SD. RESULTS Comparing baseline velocity (cm/s) between CAFF (9.3±4.8) and ABS (7.5±4.9) yielded anecdotal evidence (BF10 = 1.0). Peak hyperemic velocity (cm/s) was similar (CAFF = 77.3±16.7; ABS = 77.6±19.0, BF10 = 0.20). For slopes (TSI% /s), CAFF Slope 1 = -0.11±0.04 and Slope 2 = 1.9±0.46 were similar (both BF10≤0.20) to ABS Slope 1 = -0.12±0.03 and Slope 2 = 1.8±0.42. SBP and DBP (mmHg) were both similar (CAFF SBP = 116.0±9.8, DBP = 69.6±5.8; ABS SBP = 115.5±10.7, DBP = 69.5±5.4; both BF10≤0.22). Comparing AOP (mmHg) (CAFF = 146.6±15.0; ABS = 143.0±16.4) yielded anecdotal evidence (BF10 = 0.46). HR (bpm) was similar (CAFF = 66.5±12.3; ABS = 66.9±13.0; BF10 = 0.20). CONCLUSIONS In habitual users, consuming or abstaining from typical caffeine doses does not appear to affect post-occlusive reactive hyperemia.
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Affiliation(s)
- Matthew A Chatlaong
- Applied Human Health and Physical Function Laboratory, Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, MS, USA
| | - Daphney M Stanford
- Department of Exercise Science and Sport Management, Kennesaw State University, Kennesaw, GA
| | - William M Miller
- University of Evansville, School of Health Sciences, Evansville, IN, USA
| | - Chance J Davidson
- Applied Human Health and Physical Function Laboratory, Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, MS, USA
| | - Matthew B Jessee
- Applied Human Health and Physical Function Laboratory, Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, MS, USA
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Anderson OK, Voskuil CC, Byrd MT, Garver MJ, Rickard AJ, Miller WM, Bergstrom HC, Dinyer McNeely TK. Affective and Perceptual Responses During an 8-Week Resistance Training to Failure Intervention at Low vs. High Loads in Untrained Women. J Strength Cond Res 2023; 37:546-554. [PMID: 35947512 DOI: 10.1519/jsc.0000000000004313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
ABSTRACT Anderson, AlOK, Voskuil, CC, Byrd, MT, Garver, MJ, Rickard, AJ, Miller, WM, Bergstrom, HC, and Dinyer McNeely, TK. Affective and perceptual responses during an 8-week resistance training to failure intervention at low vs. high loads in untrained women. J Strength Cond Res 37(3): 546-554, 2023-This study examined the effects of resistance training (RT) to failure on the perceptual and affective responses, intent-to-continue RT to failure in a self-initiated session, and affect-intent relationship. Twenty-three untrained women (mean ± SD : age 21.2 ± 2.2 years; height 167 ± 5.7 cm; body mass, 62.3 ± 16.2 kg) completed an 8-week, full-body RT to failure intervention at a low (30% 1RM; n = 11) or high (80% 1RM; n = 12) load. The Borg's rating of perceived exertion (RPE) scale was used to assess the acute (aRPE) and session (sRPE) RPE immediately after repetition failure and each training session, respectively. Immediately, 15-minute, and 60-minute postsession affective responses were assessed using the feeling scale (FS; -5 to +5), and intent to continue to RT was assessed on a scale of 0-100% intention. During week 4 (W4) and week 8 (W8), aRPE (W4: 18 ± 2, W8: 18 ± 2; p ≤ 0.032) and sRPE (W4: 17 ± 2, W8: 18 ± 1; p ≤ 0.018) were greater than that during week 1 (W1; aRPE: 17 ± 2; sRPE: 16 ± 2). The FS responses increased from immediately to 60-minute postsession during W4 ( p ≤ 0.019) and W8 ( p ≤ 0.049). The correlation between affect and intent-to-continue RT increased from W1 ( r = 0.416) to W8 ( r = 0.777). Regardless of load, untrained women reported similar perceptual, affective, and intention responses. These variables should be considered to improve RT program adoption and adherence in women.
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Affiliation(s)
- Olivia K Anderson
- School of Kinesiology, Applied Health and Recreation, Oklahoma State University, Stillwater, Oklahoma
| | - Caleb C Voskuil
- Department of Kinesiology, Texas Christian University, Fort Worth, Texas
| | - M Travis Byrd
- Department of Cardiovascular Diseases, Mayo Clinic, Scottsdale, Arizona
| | - Matthew J Garver
- School of Nutrition, Kinesiology, and Psychological Science, University of Central Missouri, Warrensburg, Missouri
| | - Alex J Rickard
- School of Nutrition, Kinesiology, and Psychological Science, University of Central Missouri, Warrensburg, Missouri
| | - William M Miller
- Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, Mississippi; and
| | - Haley C Bergstrom
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky
| | - Taylor K Dinyer McNeely
- School of Kinesiology, Applied Health and Recreation, Oklahoma State University, Stillwater, Oklahoma
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Stanford DM, Chatlaong MA, Miller WM, Jessee MB. Comparing The Exercise Response And Immediate Recovery Between Two Different Blood Flow Restriction Devices. Med Sci Sports Exerc 2022. [DOI: 10.1249/01.mss.0000879976.79354.d6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chatlaong MA, Stanford DM, Miller WM, Jessee MB. Whole Body Vibration And Blood Flow Restriction For Muscle Recovery Following Exercise-induced Muscle Damage. Med Sci Sports Exerc 2022. [DOI: 10.1249/01.mss.0000879984.25767.b3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Miller WM, Chatlaong MA, Stanford DM, Jessee MB, Davidson CJ. Effects Of Caffeine Abstinence On The Acute Response To Low-load Blood Flow Restriction Exercise. Med Sci Sports Exerc 2022. [DOI: 10.1249/01.mss.0000879908.57487.b9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Davidson CJ, Chatlaong MA, Stanford DM, Miller WM, Jessee MB. Caffeine Abstinence In Habituated Users: Cardiovascular And Perceptual Responses To Exercise With Blood Flow Restriction. Med Sci Sports Exerc 2022. [DOI: 10.1249/01.mss.0000875428.10494.b2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jessee MB, Stanford DM, Chatlaong MA, Miller WM. Comparing The Resting Cardiovascular Response To Commonly Used Blood Flow Restriction Devices. Med Sci Sports Exerc 2022. [DOI: 10.1249/01.mss.0000879444.17207.67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Stanford DM, Chatlaong MA, Miller WM, Grant Mouser J, Dankel SJ, Jessee MB. A comparison of variability between absolute and relative blood flow restriction pressures. Clin Physiol Funct Imaging 2022; 42:278-285. [PMID: 35396926 DOI: 10.1111/cpf.12757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 04/06/2022] [Indexed: 11/30/2022]
Abstract
Recommendations are that blood flow restriction (BFR) be applied relative to arterial occlusion pressure (AOP) to provide a similar stimulus. PURPOSE Compare variability of the change in blood flow, shear rate, and discomfort between recommended relative pressures and an absolute pressure. METHODS During one visit, brachial arterial blood flow was measured in 91 participants using pulse-wave Doppler ultrasonography. After 5-min seated rest, AOP was measured. Following another 5-min rest, blood flow and discomfort were assessed twice before cuff inflation as controls (C1 and C2), then again with a cuff inflated to each BFR pressure (all measures separated by 1-min). Change scores from C1 to all subsequent measures were calculated (i.e., C2-C1; 40%AOP-C1; 80%AOP-C1; 100mmHg-C1). Variability of the changes were compared via pairwise modified Pitman-Morgan tests (α=.008). RESULTS Variance (95%CI) of the change for blood flow (mL/min), shear rate (1/sec), and discomfort (AU) had similar trends. C2-C1 differed from all conditions (all p<.001), 40%AOP-C1 differed from 80%AOP-C1 and 100mmHg-C1 (all p<.001), which did not differ (both p≥.117). Blood flow: C2-C1=469.79 (357.90, 644.07), 40%AOP-C1=1263.18 (962.34, 1731.80), 80%AOP-C1=1752.90 (1335.42, 2403.18), 100mmHg-C1=1603.18 (1221.36, 2197.92); Shear rate: C2-C1=6248.24 (4760.10, 8566.15), 40%AOP-C1=14625.30 (11142.06, 20050.95), 80%AOP-C1=22064.02 (16809.13, 30249.27), 100mmHg-C1=20778.76 (15829.98, 28487.21); Discomfort: C2-C1=0.07 (0.05, 0.08), 40%AOP-C1=2.03 (1.55, 2.78), 80%AOP-C1=4.26 (3.25, 5.84), 100mmHg-C1=4.50 (3.43, 6.17). CONCLUSION Contrary to previous suggestions, applying relative pressures does not necessarily guarantee a similar stimulus. It seems that higher pressures produce more variable changes even if the external pressure applied is made relative to each individual. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Daphney M Stanford
- Applied Human Health and Physical Function Laboratory, Department of Health, Exercise Science, and Recreation Management, The University of Mississippi, University, Mississippi, USA
| | - Matthew A Chatlaong
- Applied Human Health and Physical Function Laboratory, Department of Health, Exercise Science, and Recreation Management, The University of Mississippi, University, Mississippi, USA
| | - William M Miller
- Applied Human Health and Physical Function Laboratory, Department of Health, Exercise Science, and Recreation Management, The University of Mississippi, University, Mississippi, USA
| | - J Grant Mouser
- Applied Physiology Laboratory, Department of Kinesiology and Health Promotion, Troy University, Troy, AL, USA
| | - Scott J Dankel
- Exercise Physiology Laboratory, Department of Health and Exercise Science, Rowan University, Glassboro, NJ, USA
| | - Matthew B Jessee
- Applied Human Health and Physical Function Laboratory, Department of Health, Exercise Science, and Recreation Management, The University of Mississippi, University, Mississippi, USA
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Jeon S, Ye X, Miller WM, Song JS. Effect of repeated eccentric exercise on muscle damage markers and motor unit control strategies in arm and hand muscle. Sports Medicine and Health Science 2021; 4:44-53. [PMID: 35782782 PMCID: PMC9219313 DOI: 10.1016/j.smhs.2021.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/25/2021] [Accepted: 12/09/2021] [Indexed: 11/03/2022] Open
Abstract
To examine the contralateral repeated bout effect (CL-RBE) on muscle damage markers and motor unit (MU) control strategies, seventeen healthy adults performed two bouts of 60 eccentric contractions with elbow flexor (EF group; n = 9) or index finger abductor (IA group; n = 8) muscles, separated by 1 week. All participants randomly performed eccentric exercise on either the right or left arm or hand muscles, and muscle damage markers and submaximal trapezoid contraction tests were conducted pre, post, 1- and 2-day post eccentric protocol. One week after the first bout, the same exercise protocol and measurements were performed on the contralateral muscles. Surface electromyographic (EMG) signals were collected from biceps brachii (BB) or first dorsal interosseous (FDI) during maximal and submaximal tests. The linear regression analyses were used to examine MU recruitment threshold versus mean firing rate and recruitment threshold versus derecruitment threshold relationships. EMG amplitude from BB (bout 1 vs. bout 2 = 65.71% ± 22.92% vs. 43.05% ± 18.97%, p = 0.015, d = 1.077) and the y-intercept (group merged) from the MU recruitment threshold versus derecruitment threshold relationship (bout 1 vs. bout 2 = −7.10 ± 14.20 vs. 0.73 ± 16.24, p = 0.029, d = 0.513) at 50% MVIC were significantly different between two bouts. However, other muscle damage markers did not show any CL-RBE in both muscle groups. Therefore, despite changes in muscle excitation and MU firing behavior, our results do not support the existence of CL-RBE on BB and FDI muscles.
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Voskuil CC, Dinyer TK, Succi PJ, Byrd MT, Garver MJ, Rickard AJ, Miller WM, Burns S, Bergstrom HC. Affective And Perceptual Responses During A 4-week Low- Vs. High-load Resistance Training Intervention. Med Sci Sports Exerc 2021. [DOI: 10.1249/01.mss.0000762900.16390.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Stanford DM, Chatlaong MA, Miller WM, Mouser JG, Dankel SJ, Jessee MB. Applying Relative And Absolute Blood Flow Restriction Alters Blood Flow Velocity But Not Blood Profiles. Med Sci Sports Exerc 2021. [DOI: 10.1249/01.mss.0000760196.35540.67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jessee MB, Stanford DM, Chatlaong MA, Miller WM, Dankel SJ, Mouser JG. Blood Flow Restriction Stimulus Differs Between Absolute And Relative Pressures. Med Sci Sports Exerc 2021. [DOI: 10.1249/01.mss.0000760192.31597.fe] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ye X, Miller WM, Jeon S, Song JS, West TJ. Effect of Arm Eccentric Exercise on Muscle Damage of the Knee Flexors After High-Intensity Eccentric Exercise. Front Physiol 2021; 12:661618. [PMID: 33897468 PMCID: PMC8060631 DOI: 10.3389/fphys.2021.661618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 03/17/2021] [Indexed: 11/13/2022] Open
Abstract
Repeated bout effect (RBE) describes a phenomenon that an initial unaccustomed eccentric exercise (ECC) bout can confer a protective effect against muscle damage from the subsequent same exercise. This protection has been observed in the same muscle, as well as the contralateral homologous (CL-RBE) muscle. But it is unknown whether the RBE is evident for non-local unrelated heterogonous muscles. The purpose of this study was to examine whether an initial elbow flexion (EF) muscle-damaging ECC could confer RBE against muscle damage from the subsequent ECC performed in the remote lower limb knee flexor (KF) muscle group. Twenty-seven young individuals were randomly assigned into the experimental (EXP: n = 15) and the control (CON: n = 12) groups. All participants performed a baseline unilateral KF ECC (six sets of 10 repetitions) on a randomly chosen leg. After a washout period (4 weeks), the EXP group performed 60 high-intensity unilateral EF ECC on a randomly chosen arm, followed by the same intensity exercise using the contralateral KF muscle group 2 weeks later. The CON group performed the same contralateral KF ECC, but with no prior EF ECC bout. Changes in the KF muscle damage indirect markers (muscle soreness, range of motion, and maximal isometric strength) after the ECC were compared between the baseline and second bouts for both groups with mixed factorial three-way (group × bout × time) ANOVA. Additionally, index of protection for each damage marker was calculated at 1 and 2 days after the ECC and compared between groups with independent t-tests. For both groups, the magnitude of the changes in the damage markers between the baseline and the second ECC bouts were not significantly different (all values of p > 0.05). As for the index of protection, relative to the CON, the EXP showed an exacerbating damaging effect on the KF isometric strength following the second ECC bout, particularly at the 1-day post-exercise time point (index of protection: EXP vs. CON mean ± SD = -29.36 ± 29.21 vs. 55.28 ± 23.83%, p = 0.040). Therefore, our results do not support the existence of non-local RBE.
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Affiliation(s)
- Xin Ye
- Department of Rehabilitation Sciences, University of Hartford, West Hartford, CT, United States
| | - William M Miller
- Department of Health, Exercise, and Recreation Management, University of Mississippi, University City, MO, United States
| | - Sunggun Jeon
- School of Kinesiology, Applied Health and Recreation, Oklahoma State University, Stillwater, OK, United States
| | - Jun Seob Song
- Department of Health, Exercise, and Recreation Management, University of Mississippi, University City, MO, United States
| | - Tyler J West
- Department of Health, Exercise, and Recreation Management, University of Mississippi, University City, MO, United States
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West JT, Miller WM, Jeon S, Ye X. The Effects of a Preconditioning Rolling Session on Subsequent Eccentric Exercise-Induced Muscle Damage. J Strength Cond Res 2020; 34:2112-2119. [PMID: 32735422 DOI: 10.1519/jsc.0000000000003678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
West, JT, Miller, WM, Jeon, S, and Ye, X. The effects of a preconditioning rolling session on subsequent eccentric exercise-induced muscle damage. J Strength Cond Res 34(8): 2112-2119, 2020-The aim of this study was to examine the effects of a preexercise unilateral quadriceps muscle rolling intervention on subsequent ipsilateral (IPSI) or contralateral (CTRA) knee extension eccentric exercise-induced muscle damage. Twenty-seven healthy volunteers (14 men) underwent an eccentric exercise protocol (6 sets of 10 repetitions with 75% of the maximal isometric strength) with a single-leg knee extension machine. Before the eccentric exercise, the subjects were randomly assigned to either (a) IPSI group: rolling the ipsilateral knee extensor muscles, (b) CTRA: rolling the contralateral muscles, or (c) Control: sitting for 6 minutes (same duration as the rolling intervention protocol) relaxed. The muscle soreness, passive knee extension range of motion, and knee extension isometric strength were measured before, immediately, 24 hours, and 48 hours after exercise. The magnitudes of the range of motion decrement were attenuated in both the IPSI (p = 0.031) and CTRA (p = 0.014) groups 24 hours after the eccentric exercise, when compared with the control. Isometric strength (p = 0.783) and muscle soreness (p = 0.586) responses were not significantly different among the 3 groups (time points and sexes merged). Additionally, women displayed an overall faster recovery than men in isometric strength (p = 0.001) and muscle soreness (p = 0.024), evidenced by the measurements at 48 hours after exercise. Our study suggests that unilateral quadriceps rolling intervention before high-intensity muscle-damaging exercise has a beneficial effect on maintaining range of motion in both the ipsilateral and contralateral muscles.
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Affiliation(s)
- Jonathan T West
- Department of Health, Exercise Science, and Recreation Management, The University of Mississippi, University, Mississippi
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Miller WM, Ye X, Jeon S. Effects of Maximal vs. Submaximal Isometric Fatiguing Exercise on Subsequent Submaximal Exercise Performance. J Strength Cond Res 2020; 34:1875-1883. [PMID: 31145388 DOI: 10.1519/jsc.0000000000003200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Miller, WM, Ye, X, and Jeon, S. Effects of maximal vs. submaximal isometric fatiguing exercise on subsequent submaximal exercise performance. J Strength Cond Res 34(7): 1875-1883, 2020-Exercise-induced muscle fatigue directly influences subsequent exercise performance. Thus, we examined task failure times for submaximal intermittent fatiguing isometric contractions performed after a bout of sustained maximal vs. submaximal isometric fatiguing contractions with the dominant elbow flexors. Twenty physically active individuals 8 men (mean ± SD = 21.4 ± 1.8 years; 80.9 ± 12.5 kg; 180 ± 6.4 cm) and 12 women (mean ± SD = 21.4 ± 2.7; 66.8 ± 15.6 kg; 165.7 ± 7.1 cm) participated in a 3-visit randomized cross-over study. Visit 1 included familiarization, and 2 and 3 were randomized for sustained maximal (until force was below 50% of the maximal force value) or submaximal conditions (50% of maximal force until task failure), followed by submaximal intermittent isometric contractions to task failure. Surface electromyography was recorded through the biceps brachii during all fatiguing contractions. Task failure time was significantly shorter for the maximal compared with submaximal condition, and no significant difference in sex or condition was found for the subsequent fatiguing condition. Electromyography amplitude significantly increased in the submaximal intermittent isometric contractions from prefatigue and first and final postfatigue with no condition or sex differences. Electromyography mean frequency significantly decreased from prefatigue and first and final postfatigue for both sexes, with no condition or sex differences. With both maximal and submaximal exercises inducing the same level of force deficit, our results suggested that both exercises might have imposed a similar burden on the neuromuscular system, thereby not providing differential effects on the subsequent submaximal exercise performance.
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Affiliation(s)
- William M Miller
- Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, Mississippi
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Barnes JT, Wagganer JD, Loenneke JP, Kearney ML, Miller WM, Syed-Abdul MM. Comparison Of DXA And Ultrasound For Measurement Of Body Composition In Physically Active College Students. Med Sci Sports Exerc 2020. [DOI: 10.1249/01.mss.0000684896.21157.5e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Venkataramanan V, Lopez D, McCuskey DJ, Kiefus D, McDonald RI, Miller WM, Packman AI, Young SL. Knowledge, attitudes, intentions, and behavior related to green infrastructure for flood management: A systematic literature review. Sci Total Environ 2020; 720:137606. [PMID: 32325585 DOI: 10.1016/j.scitotenv.2020.137606] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/20/2020] [Accepted: 02/26/2020] [Indexed: 06/11/2023]
Abstract
Green infrastructure (GI), which mimics natural hydrological systems, is a promising solution for flood management at the intersection of urban built infrastructure and natural systems. However, it has not yet achieved widespread uptake, due in part to insufficient understanding of human dimensions of the broader socio-ecological-technical system. We therefore conducted a multidisciplinary systematic literature review to synthesize research on people's existing knowledge about flood risk and GI, and how that shapes their attitudes and motivation to adopt new solutions. We systematically screened 21,207 studies on GI for flood management; 85 met our inclusion criteria. We qualitatively analyzed these studies to extract results on knowledge, attitudes, intentions, and behavior relating to GI for flood management. Overall, knowledge of GI was low across the 44 studies in which it was evaluated. Seventy studies assessed attitudes about GI, including the functional, aesthetic, health and safety, recreational, conservation, financial, and cultural value of GI, albeit their measurement was inconsistent. Willingness to implement or pay for GI varied considerably across 55 studies in which it was measured. Twenty studies measured and documented behavior relating to GI use, and these found low rates of adoption. Few studies systematically assessed the role of demographic, socio-economic, or geographic characteristics that could influence individuals' knowledge, attitudes, intentions or behavior, and thereby the success of GI programs. We recommend that researchers should more systematically capture data on human dimensions of GI (i.e. knowledge, attitudes, intentions, and behavior) across diverse settings to improve program design and uptake, especially among vulnerable populations. Greater attention to the social component of the socio-ecological-technical system will help ensure that GI programs are equitable, inclusive, and sustainable.
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Affiliation(s)
- Vidya Venkataramanan
- Center for Water Research, Northwestern University, Evanston, IL, USA; Department of Anthropology, Northwestern University, Evanston, IL, USA
| | - Denise Lopez
- Department of Sociology, Northwestern University, Evanston, IL, USA
| | - David J McCuskey
- School of Education and Social Policy, Northwestern University, Evanston, IL, USA
| | - Daniel Kiefus
- Weinberg College of Arts and Sciences, Northwestern University, Evanston, IL, USA
| | - Robert I McDonald
- Build Healthy Cities Program, The Nature Conservancy, 4245 Fairfax Dr., Arlington, VA, USA
| | - William M Miller
- Center for Engineering Sustainability and Resilience, Northwestern University, Evanston, IL, USA; Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, USA
| | - Aaron I Packman
- Center for Water Research, Northwestern University, Evanston, IL, USA; Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL, USA
| | - Sera L Young
- Center for Water Research, Northwestern University, Evanston, IL, USA; Department of Anthropology, Northwestern University, Evanston, IL, USA; Institute for Policy Research, Northwestern University, Evanston, IL, USA.
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Jeon S, Miller WM, Ye X. A Comparison of Motor Unit Control Strategies between Two Different Isometric Tasks. Int J Environ Res Public Health 2020; 17:ijerph17082799. [PMID: 32325707 PMCID: PMC7215511 DOI: 10.3390/ijerph17082799] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/12/2020] [Accepted: 04/15/2020] [Indexed: 11/17/2022]
Abstract
Background: This study examined the motor unit (MU) control strategies for non-fatiguing isometric elbow flexion tasks at 40% and 70% maximal voluntary isometric contraction. Methods: Nineteen healthy individuals performed two submaximal tasks with similar torque levels: contracting against an immovable object (force task), and maintaining the elbow joint angle against an external load (position task). Surface electromyographic (EMG) signals were collected from the agonist and antagonist muscles. The signals from the agonist were decomposed into individual action potential trains. The linear regression analysis was used to examine the MU recruitment threshold (RT) versus mean firing rates (MFR), and RT versus derecruitment threshold (DT) relationships. Results: Both agonist and antagonist muscles’ EMG amplitudes did not differ between two tasks. The linear slopes of the MU RT versus MFR and RT versus DT relationships during the position task were more negative (p = 0.010) and more positive (p = 0.023), respectively, when compared to the force task. Conclusions: To produce a similar force output, the position task may rely less on the recruitment of relatively high-threshold MUs. Additionally, as the force output decreases, MUs tend to derecruit at a higher force level during the position task.
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Affiliation(s)
| | | | - Xin Ye
- Correspondence: ; Tel.: +1-662-915-1630
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Miller WM, Barnes JT, Sofo SS, Wagganer JD. Comparison of Myoelectric Activity During a Suspension-Based and Traditional Split Squat. J Strength Cond Res 2020; 33:3236-3241. [PMID: 31453938 DOI: 10.1519/jsc.0000000000003338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Miller, WM, Barnes, JT, Sofo, SS, and Wagganer, JD. Comparison of myoelectric activity during a suspension-based and traditional split squat. J Strength Cond Res 33(12): 3236-3241, 2019-Over several decades, traditional resistance training has incorporated body-mass suspension training (SPT), for example, Total-Body Resistance Exercise (TRX); however, very little research has been completed investigating the effects of lower body SPT. Therefore, the purpose of this study was to assess sex differences in myoelectric activity via electromyography while performing a stable (i.e., bench) traditional split squat (TSS) compared with suspension body-mass split squat (TRXSS). Nineteen recreationally active individuals (mean ± SD = men: n = 9; 21.4 ± 2.1 years; 177.2 ± 9.0 cm; 84.2 ± 8.8 kg; women: n = 10; 21.5 ± 1.6 years; 160.7 ± 8.5 cm; 59.1 ± 7.9 kg) participated in this investigation. Subjects performed 3 training sessions, 1 familiarization and 2 (one for each variation) split squat. The TRXSS was performed by placing the rear foot within the foot cradle of the strap, while the TSS required placement of the rear foot on a stable bench (40.64 cm). The TRXSS resulted in higher peak and average myoelectric activity overall, as well as greater gluteus maximus myoelectric activity. No gender or rectus femoris myoelectric activity differences were found. The increased myoelectric activity of the gluteus maximus during the TRXSS was most likely due to increased medial/lateral stabilization demands on the suspended leg. These findings provide insight into TRX as a useful exercise modality for recreationally active or rehabilitative purposes.
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Affiliation(s)
- William M Miller
- Department of Kinesiology, Nutrition, and Recreation Management, University of Mississippi, University, Mississippi
| | - Jeremy T Barnes
- Department of Health, Human Performance, and Recreation, Southeast Missouri State University, Cape Girardeau, Missouri
| | - Seidu S Sofo
- Department of Health, Human Performance, and Recreation, Southeast Missouri State University, Cape Girardeau, Missouri
| | - Jason D Wagganer
- Department of Health, Human Performance, and Recreation, Southeast Missouri State University, Cape Girardeau, Missouri
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Miller WM, Miller WC, Barrington C, Weir SS, Chen SY, Emch ME, Pettifor AE, Paz-Bailey G. Sex work, discrimination, drug use and violence: a pattern for HIV risk among transgender sex workers compared to MSM sex workers and other MSM in Guatemala. Glob Public Health 2020; 15:262-274. [PMID: 31599193 PMCID: PMC10885015 DOI: 10.1080/17441692.2019.1671984] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 08/21/2019] [Indexed: 10/25/2022]
Abstract
The risk of HIV infection is higher among transgender women and cisgender men who have sex with men (MSM) compared to the general population due in part to social and contextual factors. This study aimed to determine the prevalence and association of alcohol and drug abuse, discrimination and violence among transgender sex workers compared to cisgender male sex workers and cisgender men who had not received money for sex in Guatemala City. In 2010, transgender women and cisgender men who had had sex with men or transgender women were recruited into a cross-sectional behavioural survey. Among transgender women, 86% received money for sex in the past year. Transgender sex workers were more likely to use drugs and binge drink, three times as likely to be discriminated against and eight times as likely to be forced to have sex compared to non-sex worker men. Male sex workers were twice as likely to use illicit drugs or experience physical violence and six times as likely to experience forced sex compared to non-sex worker men. Transgender and male sex workers would benefit from harm reduction for substance use, violence prevention, response and strategies to mitigate discrimination.
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Affiliation(s)
- William M Miller
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - William C Miller
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Division of Infectious Diseases, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Clare Barrington
- Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Sharon S Weir
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Sanny Y Chen
- Division of Global HIV/AIDS, Centers for Disease Control and Prevention - Central America Regional Office, Guatemala City, Guatemala
| | - Michael E Emch
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Geography, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Audrey E Pettifor
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Gabriela Paz-Bailey
- Training Programs in Epidemiology and Public Health Interventions Network (TEPHINET) Central American office, Guatemala City, Guatemala
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Griffin JS, Haug LA, Rivera VA, Gonzalez LMH, Kelly JJ, Miller WM, Wells GF, Packman AI. Soil hydrology drives ecological niche differentiation in a native prairie microbiome. FEMS Microbiol Ecol 2020; 96:5593953. [PMID: 31626296 DOI: 10.1093/femsec/fiz163] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 10/16/2019] [Indexed: 11/14/2022] Open
Abstract
While the impacts of soil moisture on soil microbiome diversity and composition are well characterized, the influence of hydrological regime has been overlooked. As precipitation patterns are altered by climate change, understanding the impact of soil hydrology on community structure and function is critical. In this work, water level was continuously monitored for over a year in a Midwestern prairie-wetland at 10 cm depth increments up to a depth of 120 cm in 10 locations. We analyzed microbiome composition and edaphic factors in soil cores collected from this unique spatially distributed, longitudinal data set. We demonstrate that the fraction of time that each sample was inundated explains more variability in diversity and composition across this site than other commonly assessed edaphic factors, such as soil pH or depth. Finally, we show that these compositional changes influence abundance of ammonia oxidizers. The observed patterns in community composition and diversity are fundamentally regulated by the interaction of water with a structured landscape, particularly an elevated sand ridge characterized by drier conditions and a lower-lying wetland with more clayey soils. Similar processes are generally expected to influence the biogeography of many terrestrial environments, as morphology, hydrology and soil properties generally co-vary.
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Affiliation(s)
- James S Griffin
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA
| | - Loren A Haug
- Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA
| | - Vivien A Rivera
- Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA
| | - Liliana M Hernandez Gonzalez
- Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA
| | - John J Kelly
- Department of Biology, Loyola University Chicago, 1032 W Sheridan Rd., Chicago, IL 60660, USA
| | - William M Miller
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA
| | - George F Wells
- Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA
| | - Aaron I Packman
- Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, USA
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Dinyer TK, Byrd MT, Garver MJ, Rickard AJ, Miller WM, Burns S, Clasey JL, Bergstrom HC. Low-Load vs. High-Load Resistance Training to Failure on One Repetition Maximum Strength and Body Composition in Untrained Women. J Strength Cond Res 2019; 33:1737-1744. [PMID: 31136545 DOI: 10.1519/jsc.0000000000003194] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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 and body composition in untrained women. J Strength Cond Res 33(7): 1737-1744, 2019-This study examined the effects of resistance training (RT) to failure at low and high loads on one repetition maximum (1RM) strength and body composition (bone- and fat-free mass [BFFM] and percent body fat [%BF]) in untrained women. Twenty-three untrained women (age: 21.2 ± 2.2 years; height: 167.1 ± 5.7 cm; body mass: 62.3 ± 16.2 kg) completed a 12-week RT to failure intervention at a low (30% 1RM) (n = 11) or high (80% 1RM) (n = 12) load. On weeks 1, 5, and 12, subjects completed 1RM testing for 4 different exercises (leg extension [LE], seated military press [SMP], leg curl [LC], and lat pull down [LPD]) and a dual-energy x-ray absorptiometry scan to assess body composition. During weeks 2-4 and 6-7, the subjects completed 2 sets to failure for each exercise. During weeks 8-11, the subjects completed 3 sets to failure for each exercise. The 1RM strength increased from week 1 to week 5 (LE: 18 ± 16%; SMP: 9 ± 11%; LC: 12 ± 22%; LPD: 13 ± 9%), week 1 to week 12 (LE: 32 ± 24%; SMP: 17 ± 14%; LC: 23 ± 26%; LPD: 25 ± 13%), and week 5 to week 12 (LE: 11 ± 9%; SMP: 7 ± 9%; LC: 10 ± 7%; LPD: 11 ± 11%) in each exercise, with no significant differences between groups. There were no significant changes in BFFM (p = 0.241) or %BF (p = 0.740) for either group. Resistance training to failure at 30% 1RM and 80% 1RM resulted in similar increases in 1RM strength, but no change in BFFM or %BF. Untrained women can increase 1RM strength during RT at low and high loads, if repetitions are taken to failure.
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Affiliation(s)
- Taylor K Dinyer
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky
| | - M Travis Byrd
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky
| | - Matthew J Garver
- School of Nutrition, Kinesiology, and Psychological Science, University of Central Missouri, Warrensburg, Missouri
| | - Alex J Rickard
- School of Nutrition, Kinesiology, and Psychological Science, University of Central Missouri, Warrensburg, Missouri
| | - William M Miller
- Department of Health, Science, and Recreation Management, University of Mississippi, Oxford, Mississippi
| | - Steve Burns
- School of Nutrition, Kinesiology, and Psychological Science, University of Central Missouri, Warrensburg, Missouri
| | - Jody L Clasey
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky
| | - Haley C Bergstrom
- Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky
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Ye X, Killen BS, Zelizney KL, Miller WM, Jeon S. Unilateral hamstring foam rolling does not impair strength but the rate of force development of the contralateral muscle. PeerJ 2019; 7:e7028. [PMID: 31179197 PMCID: PMC6545114 DOI: 10.7717/peerj.7028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 04/26/2019] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND Self-administered foam rolling (SAFR) is an effective massage technique often used in sport and rehabilitation settings to improve range of motion (ROM) without impairing the strength performance. However, the effects of unilateral SAFR on contralateral non-intervened muscle's rate of force development (RFD) are unknown. Therefore, the purpose of this investigation was to examine the acute effects of unilateral hamstrings SAFR on the contralateral limb flexibility, the isometric strength, and the RFD parameters. METHODS Thirty-four subjects (21 women) completed two separate randomly sequenced experimental visits, during which the control (rested for 10 min) or ten, 30-second SAFR were performed with the dominant hamstring muscle group. Before (Pre) and after (Post) the interventions, the contralateral hip flexion passive ROM, the maximal explosive isometric strength of the contralateral knee flexors with the corresponding prime mover muscles' surface electromyographic (EMG) amplitude were measured. Separate two-way (time ×intervention) repeated measures analyses of variance (ANOVAs) were used to examine the potential changes of the dependent variables. RESULTS The SAFR significantly improved the contralateral limb ROM (Pre vs. Post: 68.3 ± 21.0 vs. 73.2 ± 23.2 degrees, p < 0.001; d = 0.22). No change was found for the contralateral isometric strength or the maximal EMG amplitude. For the RFD parameters, the percent changes of the RFDs for the first 50, 100, and 200 ms of the maximal explosive isometric contraction were -31.2%, -16.8%, and -10.1%, respectively, following the unilateral SAFR, relative to the control condition. In addition, the decrement of the first 50-ms RFD reached statistical significance (p = 0.007; Cohen's d = 0.44). CONCLUSION Ten sets of 30-second unilateral hamstring SAFR improved the ROM of the non-intervened contralateral limb, but decreased its ability to generate force, especially during the early phase (e.g., 50 ms) of the maximal explosive contraction.
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Affiliation(s)
- Xin Ye
- Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, MS, United States of America
| | - Benjamin S. Killen
- Department of Health Related Professions, University of Mississippi Medical Center, Jackson, MS, United States of America
| | - Krista L. Zelizney
- Nicole Wertheim College of Nursing & Health Sciences, Florida International University, Miami, FL, United States of America
| | - William M. Miller
- Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, MS, United States of America
| | - Sunggun Jeon
- Department of Health, Exercise Science, and Recreation Management, University of Mississippi, University, MS, United States of America
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Martinez AF, Miller WM. Enabling Large-Scale Ex Vivo Production of Megakaryocytes from CD34 + Cells Using Gas-Permeable Surfaces. Stem Cells Transl Med 2019; 8:658-670. [PMID: 30848565 PMCID: PMC6591548 DOI: 10.1002/sctm.18-0160] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Accepted: 02/06/2019] [Indexed: 12/11/2022] Open
Abstract
Patients suffering from acute or sustained thrombocytopenia require platelet transfusions, which are entirely donor-based and limited by challenges related to storage and fluctuating supply. Developing cell-culture technologies will enable ex vivo and donor-independent platelet production. However, critical advancements are needed to improve scalability and increase megakaryocyte (Mk) culture productivity. To address these needs, we evaluated Mk production from mobilized peripheral blood CD34+ cells cultured on a commercially available gas-permeable silicone rubber membrane, which provides efficient gas exchange, and investigated the use of fed-batch media dilution schemes. Starting with a cell-surface density of 40 × 103 CD34+ cells per cm2 (G40D), culturing cells on the membrane for the first 5 days and employing media dilutions yielded 39 ± 19 CD41+ CD42b+ Mks per input CD34+ cell by day 11-a 2.2-fold increase compared with using standard culture surfaces and full media exchanges. By day 7, G40D conditions generated 1.5-fold more CD34+ cells and nearly doubled the numbers of Mk progenitors. The increased number of Mk progenitors coupled with media dilutions, potentially due to the retention of interleukin (IL)-3, increased Mk production in G40D. Compared with controls, G40D had higher viability, yielded threefold more Mks per milliliter of media used and exhibited lower mean ploidy, but had higher numbers of high-ploidy Mks. Finally, G40D-Mks produced proplatelets and platelet-like-particles that activate and aggregate upon stimulation. These results highlight distinct improvements in Mk cell-culture and demonstrate how new technologies and techniques are needed to enable clinically relevant production of Mks for platelet generation and cell-based therapies.
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Affiliation(s)
- Andres F Martinez
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois, USA
| | - William M Miller
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois, USA.,Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Evanston, Illinois, USA
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Jeon S, Ye X, Miller WM. Sex comparisons of agonist and antagonist muscle electromyographic parameters during two different submaximal isometric fatiguing tasks. Physiol Rep 2019; 7:e14022. [PMID: 30839175 PMCID: PMC6401663 DOI: 10.14814/phy2.14022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 02/03/2019] [Accepted: 02/11/2019] [Indexed: 02/03/2023] Open
Abstract
To examine the task failure time of the force- and position-based submaximal elbow flexion fatiguing tasks for both sexes, twelve men and eight women visited the laboratory for two separate experimental occasions. During the experiment, they pulled against a rigid restraint for the force task and maintained a constant elbow joint angle to support an equivalent inertial load for the position task. For both fatiguing tasks (50% of the isometric strength at the elbow joint angle of 135 degree), the task failure time, along with the surface electromyographic (EMG) amplitude and mean frequency (MNF) were measured. The average failure time was longer for the force task than that for the position task (sexes combined: 39.6 ± 16.6 sec vs. 33.9 ± 14.9 sec, P = 0.033). In addition, men were overall less fatigable than women (tasks combined: 42.0 ± 14.7 sec vs. 28.7 ± 10.3 sec, P = 0.020). The multiple regression analyses showed that the task failure time in women was solely predicted by the rate of change of the triceps EMG MNF. Thus, more fatigability of women in this study was likely due to the quicker fatiguing rate of the antagonist triceps brachii muscle. Different from most previous studies that have used 90-degree elbow joint angle, the current 135-degree joint angle setup might have created a situation where greater muscle activity from the related muscles (e.g., the antagonist) were required for women than for men to stabilize the joint, thereby resulting in a shorter task failure time.
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Affiliation(s)
- Sunggun Jeon
- Department of Health, Exercise Science, and Recreation ManagementThe University of MississippiUniversityMississippi
| | - Xin Ye
- Department of Health, Exercise Science, and Recreation ManagementThe University of MississippiUniversityMississippi
| | - William M. Miller
- Department of Health, Exercise Science, and Recreation ManagementThe University of MississippiUniversityMississippi
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Herce ME, Miller WM, Bula A, Edwards JK, Sapalalo P, Lancaster KE, Mofolo I, Furtado MLM, Weir SS. Achieving the first 90 for key populations in sub-Saharan Africa through venue-based outreach: challenges and opportunities for HIV prevention based on PLACE study findings from Malawi and Angola. J Int AIDS Soc 2018; 21 Suppl 5:e25132. [PMID: 30033589 PMCID: PMC6055127 DOI: 10.1002/jia2.25132] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 05/18/2018] [Indexed: 11/08/2022] Open
Abstract
INTRODUCTION Providing outreach HIV prevention services at venues (i.e. "hotspots") where people meet new sex partners can decrease barriers to HIV testing services (HTS) for key populations (KP) in sub-Saharan Africa (SSA). We offered venue-based HTS as part of bio-behavioural surveys conducted in urban Malawi and Angola to generate regional insights into KP programming gaps and identify opportunities to achieve the "first 90" for KP in SSA. METHODS From October 2016 to March 2017, we identified and verified 1054 venues in Luanda and Benguela, Angola and Zomba, Malawi and conducted bio-behavioural surveys at 166 using the PLACE method. PLACE interviews community informants to systematically identify public venues where KP can be reached and conducts bio-behavioural surveys at a stratified random sample of venues. We present survey results using summary statistics and multivariable modified Poisson regression modelling to examine associations between receipt of outreach worker-delivered HIV/AIDS education and HTS uptake. We applied sampling weights to estimate numbers of HIV-positive KP unaware of their status at venues. RESULTS We surveyed 959 female sex workers (FSW), 836 men who have sex with men (MSM), and 129 transgender women (TGW). An estimated 71% of HIV-positive KP surveyed were not previously aware of their HIV status, receiving a new HIV diagnosis through PLACE venue-based HTS. If venue-based HTS were implemented at all venues, 2022 HIV-positive KP (95% CI: 1649 to 2477) who do not know their status could be reached, including 1666 FSW (95% CI: 1397 to 1987), 274 MSM (95% CI: 160 to 374), and 82 TG (95% CI: 20 to 197). In multivariable analyses, FSW, MSM, and TGW who received outreach worker-delivered HIV/AIDS education were 3.15 (95% CI: 1.99 to 5.01), 3.12 (95% CI: 2.17 to 4.48), and 1.80 (95% CI: 0.67 to 4.87) times as likely, respectively, as those who did not to have undergone HTS within the last six months. Among verified venues, <=68% offered any on-site HIV prevention services. CONCLUSIONS Availability of HTS and other HIV prevention services was limited at venues. HIV prevention can be delivered at venues, which can increase HTS uptake and HIV diagnosis among individuals not previously aware of their status. Delivering venue-based HTS may represent an effective strategy to reach the "first 90" for KP in SSA.
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Affiliation(s)
- Michael E Herce
- Department of MedicineUNC Institute for Global Health & Infectious DiseasesUniversity of North Carolina at Chapel HillChapel HillNCUSA
- UNC Project—MalawiLilongweMalawi
| | - William M Miller
- Carolina Population CenterUniversity of North Carolina at Chapel HillChapel HillNCUSA
| | | | - Jessie K Edwards
- Department of EpidemiologyUniversity of North Carolina at Chapel HillChapel HillNCUSA
| | | | - Kathryn E Lancaster
- Division of EpidemiologyCollege of Public HealthThe Ohio State UniversityColumbusOHUSA
| | | | | | - Sharon S Weir
- Carolina Population CenterUniversity of North Carolina at Chapel HillChapel HillNCUSA
- Department of EpidemiologyUniversity of North Carolina at Chapel HillChapel HillNCUSA
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Shrum LK, Wagganer JD, Miller WM, Syed-Abdul MM, Soni DS, Hoover BJ, McCrate M, Kester B, Nguyen DT, Pujol TJ. Comparison of Six-minute Walk Test VO2peak Prediction Equations in Cardiac Rehabilitation Patients. Med Sci Sports Exerc 2018. [DOI: 10.1249/01.mss.0000536263.66458.d0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Barnes JT, Wagganer JD, Loenneke JP, Miller WM. Validity of Ultrasound and Skinfolds for the Measurement of Body Composition in Collegiate Basketball Players. Med Sci Sports Exerc 2018. [DOI: 10.1249/01.mss.0000535633.10515.3f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Syed-Abdul MM, Soni DS, Miller WM, Johnson RJ, Barnes JT, Pujol TJ, Wagganer JD. Traditional Versus Suspended Push-up Muscle Activation in Athletes and Sedentary Women. J Strength Cond Res 2018; 32:1816-1820. [PMID: 29324579 DOI: 10.1519/jsc.0000000000002433] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Syed-Abdul, MM, Soni, DS, Miller, WM, Johnson, RJ, Barnes, JT, Pujol, TJ, and Wagganer, JD. Traditional versus suspended push-up muscle activation in athletes and sedentary women. J Strength Cond Res 32(7): 1816-1820, 2018-Many strength training programs incorporate push-up exercises, which primarily activate upper-body muscles. Past data support the fact that shoulder girdle muscles (i.e., triceps (T) and anterior deltoids [AD]) exhibit greater electromyography (EMG) activity when a push-up is performed on an unstable (i.e., suspended [SP]) vs. stable (i.e., traditional [TD]) surface (). Sixty-nine healthy female volunteers (soccer players [SO], n = 24; gymnasts [GY], n = 21; sedentary [SE], n = 24) performed three TD and three SP push-ups. Muscle activation, expressed as absolute integral (mV), was measured using EMG analysis. Significant increases in muscle activation were exhibited by GY (TD: p < 0.01 and SP: p < 0.001) and SO (TD: p < 0.05 and SP: p < 0.05) compared to SE for the T muscle. Only SO (p < 0.05) exhibited significantly higher muscle activation during the SP versus TD. For the AD, values were significantly higher for SO (TD: p < 0.001 and SP: p < 0.001) and GY (TD: p < 0.01 and SP: p < 0.01) compared to the SE group. In addition, significantly higher values were exhibited by SO compared with GY during TD push-ups (p < 0.01). Both the SO (p < 0.05) and GY (p < 0.05) group exhibited significantly higher values during SP versus TD push-ups. Finally, values were significantly higher for the AD compared to the T muscle only in the SO group during TD (p < 0.01) and SP (p < 0.05) push-ups. Data from this study for trained women (i.e., SO) are consistent with previous studies, whereas for untrained women (i.e., SE) the findings differed during TD and SP push-ups for both muscles. Differences were also observed between female SO and GY are unexplainable and therefore need further investigation.
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Affiliation(s)
- Majid M Syed-Abdul
- Departments of Health, Human Performance, and Recreation, Southeast Missouri State University, Cape Girardeau, Missouri
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Martinez AF, McMahon RD, Horner M, Miller WM. A uniform-shear rate microfluidic bioreactor for real-time study of proplatelet formation and rapidly-released platelets. Biotechnol Prog 2017; 33:1614-1629. [PMID: 28960897 DOI: 10.1002/btpr.2563] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 09/05/2017] [Indexed: 12/17/2022]
Abstract
Platelet transfusions, with profound clinical importance in blood clotting and wound healing, are entirely derived from human volunteer donors. Hospitals rely on a steady supply of donations, but these methods are limited by a 5-day shelf life, the potential risk of contamination, and differences in donor/recipient histocompatibility. These challenges invite the opportunity to generate platelets ex vivo. Although much progress has been made in generating large numbers of culture-derived megakaryocytes (Mks, the precursor cells to platelets), stimulating a high percentage of Mks to undergo platelet release remains a major challenge. Recent studies have demonstrated the utility of shear forces to enhance platelet release from cultured Mks. In this study, we performed a computational fluid dynamics (CFD) analysis of several published platelet microbioreactor systems, and used the results to develop a new 7-µm slit bioreactor-with well-defined flow patterns and uniform shear profiles. This uniform-shear-rate bioreactor (USRB-7µm) permits real-time visualization of the proplatelet (proPLT) formation process and the rapid-release of individual platelet-like-particles (PLPs), which has been observed in vivo, but not previously reported for platelet bioreactors. We showed that modulating shear forces and flow patterns had an immediate and significant impact on PLP generation. Surprisingly, using a single flow instead of dual flows led to an unexpected six-fold increase in PLP production. By identifying particularly effective operating conditions within a physiologically relevant environment, this USRB-7µm will be a useful tool for the study and analysis of proPLT/PLP formation that will further understanding of how to increase ex vivo platelet release. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:1614-1629, 2017.
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Affiliation(s)
- Andres F Martinez
- Dept. of Chemical and Biological Engineering, Northwestern University, Evanston, IL, 60208
| | - Richard D McMahon
- Master of Biotechnology Program, Northwestern University, Evanston, IL, 60208
| | | | - William M Miller
- Dept. of Chemical and Biological Engineering, Master of Biotechnology Program, Northwestern University, Evanston, IL, 60208
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Uzarski JS, DiVito MD, Wertheim JA, Miller WM. Essential design considerations for the resazurin reduction assay to noninvasively quantify cell expansion within perfused extracellular matrix scaffolds. Biomaterials 2017; 129:163-175. [PMID: 28343003 DOI: 10.1016/j.biomaterials.2017.02.015] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 02/11/2017] [Indexed: 12/29/2022]
Abstract
Precise measurement of cellularity within bioartificial tissues and extracellular matrix (ECM) scaffolds is necessary to augment rigorous characterization of cellular behavior, as accurate benchmarking of tissue function to cell number allows for comparison of data across experiments and between laboratories. Resazurin, a soluble dye that is reduced to highly fluorescent resorufin in proportion to the metabolic activity of a cell population, is a valuable, noninvasive tool to measure cell number. We investigated experimental conditions in which resazurin reduction is a reliable indicator of cellularity within three-dimensional (3D) ECM scaffolds. Using three renal cell populations, we demonstrate that correlation of viable cell numbers with the rate of resorufin generation may deviate from linearity at higher cell densities, lower resazurin working volumes, or longer incubation times that all contribute to depleting the pool of resazurin. In conclusion, while the resazurin reduction assay provides a powerful, noninvasive readout of metrics enumerating cellularity and growth within ECM scaffolds, assay conditions may strongly influence its applicability for accurate quantification of cell number. The approach and methodological recommendations presented herein may be used as a guide for application-specific optimization of this assay to obtain rigorous and accurate measurement of cellular content in bioengineered tissues.
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Affiliation(s)
- Joseph S Uzarski
- Comprehensive Transplant Center, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA; Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Michael D DiVito
- Comprehensive Transplant Center, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA; Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Jason A Wertheim
- Comprehensive Transplant Center, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA; Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA; Department of Surgery, Jesse Brown VA Medical Center, Chicago, IL 60612, USA; Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, IL 60611, USA; Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA; Chemistry of Life Processes Institute, Northwestern University, Evanston, IL 60208, USA.
| | - William M Miller
- Chemistry of Life Processes Institute, Northwestern University, Evanston, IL 60208, USA; Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA.
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Schlinker AC, Duncan MT, DeLuca TA, Whitehead DC, Miller WM. Megakaryocyte Polyploidization and Proplatelet Formation in Low-Attachment Conditions. Biochem Eng J 2016; 111:24-33. [PMID: 27087780 DOI: 10.1016/j.bej.2016.03.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In vitro-derived platelets (PLTs), which could provide an alternative source of PLTs for patient transfusions, are formed from polyploid megakaryocytes (MKs) that extend long cytoplasmic projections, termed proplatelets (proPLTs). In this study, we compared polyploidization and proPLT formation (PPF) of MKs cultured on surfaces that either promote or inhibit protein adsorption and subsequent cell adhesion. A megakaryoblastic cell line exhibited increased polyploidization and arrested PPF on a low-attachment surface. Primary human MKs also showed low levels of PPF on the same surface, but no difference in ploidy. Importantly, both cell types exhibited accelerated PPF after transfer to a surface that supports attachment, suggesting that pre-culture on a non-adhesive surface may facilitate synchronization of PPF and PLT generation in culture.
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Affiliation(s)
- Alaina C Schlinker
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL
| | - Mark T Duncan
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL
| | - Teresa A DeLuca
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL
| | - David C Whitehead
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL
| | - William M Miller
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL
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Duncan MT, DeLuca TA, Kuo HY, Yi M, Mrksich M, Miller WM. SIRT1 is a critical regulator of K562 cell growth, survival, and differentiation. Exp Cell Res 2016; 344:40-52. [PMID: 27086164 PMCID: PMC4879089 DOI: 10.1016/j.yexcr.2016.04.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 04/09/2016] [Accepted: 04/12/2016] [Indexed: 12/13/2022]
Abstract
Inhibition of histone deacetylases (HDACi) has emerged as a promising approach in the treatment of many types of cancer, including leukemias. Among the HDACs, Class III HDACs, also known as sirtuins (SIRTs), are unique in that their function is directly related to the cell's metabolic state through their dependency on the co-factor NAD(+). In this study, we examined the relation between SIRTs and the growth, survival, and differentiation of K562 erythroleukemia cells. Using a mass spectrometry approach we previously developed, we show that SIRT expression and deacetylase activity in these cells changes greatly with differentiation state (undifferentiated vs. megakaryocytic differentiation vs. erythroid differentiation). Moreover, SIRT1 is crucially involved in regulating the differentiation state. Overexpression of wildtype (but not deacetylase mutant) SIRT1 resulted in upregulation of glycophorin A, ~2-fold increase in the mRNA levels of α, γ, ε, and ζ-globins, and spontaneous hemoglobinization. Hemin-induced differentiation was also enhanced by (and depended on) higher SIRT1 levels. Since K562 cells are bipotent, we also investigated whether SIRT1 modulation affected their ability to undergo megakaryocytic (MK) differentiation. SIRT1 was required for commitment to the MK lineage and subsequent maturation, but was not directly involved in polyploidization of either K562 cells or an already-MK-committed cell line, CHRF-288-11. The observed blockage in commitment to the MK lineage was associated with a dramatic decrease in the formation of autophagic vacuoles, which was previously shown to be required for K562 cell MK commitment. Autophagy-associated conversion of the protein LC3-I to LC3-II was greatly enhanced by overexpression of wildtype SIRT1, further suggesting a functional connection between SIRT1, autophagy, and MK differentiation. Based on its clear effects on autophagy, we also examined the effect of SIRT1 modulation on stress responses. Consistent with results of prior studies, we found that SIRT1 silencing modestly promoted drug-induced apoptosis, while overexpression was protective. Furthermore, pan-SIRT inhibition mediated by nicotinamide pre-treatment substantially increased imatinib-induced apoptosis. Altogether, our results suggest a complex role for SIRT1 in regulating many aspects of K562 cell state and stress response. These observations warrant further investigation using normal and leukemic primary cell models. We further suggest that, ultimately, a well-defined mapping of HDACs to their substrates and corresponding signaling pathways will be important for optimally designing HDACi-based therapeutic approaches.
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Affiliation(s)
| | | | - Hsin-Yu Kuo
- Department of Biomedical Engineering; Department of Chemistry; Department of Cell and Molecular Biology
| | - Minchang Yi
- Master of Biotechnology Program, Northwestern University, Evanston, IL 60208, United States
| | - Milan Mrksich
- Department of Biomedical Engineering; Department of Chemistry; Department of Cell and Molecular Biology; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, United States
| | - William M Miller
- Department of Chemical and Biological Engineering; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, United States.
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Barnes JT, Wagganer JD, Loenneke JP, Miller WM, Gegg CR, Kylie WA, McDowell KW, Guy JD. Validity of Ultrasound and Skinfolds for the Measurement of Body Composition in Collegiate Baseball Players. Med Sci Sports Exerc 2016. [DOI: 10.1249/01.mss.0000487989.21916.c7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Miller WM, Wagganer JD, Barnes JT, Sofo SS, Godard MP. Assessment Of Electromyographic Activity During a TRX And Traditional Split-squat. Med Sci Sports Exerc 2016. [DOI: 10.1249/01.mss.0000487198.50101.ba] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Wagganer JD, Miller WM, Syed-Abdul MM, Soni DS, Hoover BJ, McCrate MK, Kester BA, Nguyen DT, Pujol TJ. Effects of High-intensity Interval Training vs. Moderate Intensity Continuous Exercise in Cardiac Rehabilitation Patients. Med Sci Sports Exerc 2016. [DOI: 10.1249/01.mss.0000486976.03391.1e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Konieczna IM, DeLuca TA, Eklund EA, Miller WM. Hoxa10 null animals exhibit reduced platelet biogenesis. Br J Haematol 2016; 173:303-13. [PMID: 26847476 DOI: 10.1111/bjh.13949] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Accepted: 11/25/2015] [Indexed: 01/17/2023]
Abstract
The transcription factor HOXA10 is an important regulator of myelopoiesis. Engineered over-expression of Hoxa10 in mice results in a myeloproliferative disorder that progresses to acute myeloid leukaemia (AML) over time, and in humans over-expression is associated with poor outcomes in AML. Here, we report that loss of Hoxa10 expression in mice results in reduced platelet count and platelet production, but does not affect clotting efficiency. About 40% fewer platelets were found in Hoxa10 null animals in comparison to wild type littermates. We found a nearly 50% reduction in the percentage of reticulated platelets in Hoxa10 null mice, suggesting deficient platelet production. Furthermore, Hoxa10 null animals recovered less efficiently from induced thrombocytopenia, supporting our hypothesis of defective platelet production. This also correlated with reduced colony formation potential of stem and progenitor cells seeded in megakaryocyte-enhancing conditions in vitro. Together, our results indicate that HOXA10 is important for megakaryopoiesis and platelet biogenesis.
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Affiliation(s)
- Iwona M Konieczna
- Chemical and Biological Engineering Department, Northwestern University, Evanston, IL, USA.,Currently at Transplant Surgery Division, Northwestern University School of Medicine, Chicago, IL, USA
| | - Teresa A DeLuca
- Chemical and Biological Engineering Department, Northwestern University, Evanston, IL, USA
| | - Elizabeth A Eklund
- Hematology Oncology Division, Northwestern University School of Medicine, Chicago, IL, USA.,Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA.,Jesse Brown VA Medical Center, Chicago, IL, USA
| | - William M Miller
- Chemical and Biological Engineering Department, Northwestern University, Evanston, IL, USA.,Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA
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Uzarski JS, Su J, Xie Y, Zhang ZJ, Ward HH, Wandinger-Ness A, Miller WM, Wertheim JA. Epithelial Cell Repopulation and Preparation of Rodent Extracellular Matrix Scaffolds for Renal Tissue Development. J Vis Exp 2015:e53271. [PMID: 26327609 DOI: 10.3791/53271] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
This protocol details the generation of acellular, yet biofunctional, renal extracellular matrix (ECM) scaffolds that are useful as small-scale model substrates for organ-scale tissue development. Sprague Dawley rat kidneys are cannulated by inserting a catheter into the renal artery and perfused with a series of low-concentration detergents (Triton X-100 and sodium dodecyl sulfate (SDS)) over 26 hr to derive intact, whole-kidney scaffolds with intact perfusable vasculature, glomeruli, and renal tubules. Following decellularization, the renal scaffold is placed inside a custom-designed perfusion bioreactor vessel, and the catheterized renal artery is connected to a perfusion circuit consisting of: a peristaltic pump; tubing; and optional probes for pH, dissolved oxygen, and pressure. After sterilizing the scaffold with peracetic acid and ethanol, and balancing the pH (7.4), the kidney scaffold is prepared for seeding via perfusion of culture medium within a large-capacity incubator maintained at 37 °C and 5% CO2. Forty million renal cortical tubular epithelial (RCTE) cells are injected through the renal artery, and rapidly perfused through the scaffold under high flow (25 ml/min) and pressure (~230 mmHg) for 15 min before reducing the flow to a physiological rate (4 ml/min). RCTE cells primarily populate the tubular ECM niche within the renal cortex, proliferate, and form tubular epithelial structures over seven days of perfusion culture. A 44 µM resazurin solution in culture medium is perfused through the kidney for 1 hr during medium exchanges to provide a fluorometric, redox-based metabolic assessment of cell viability and proliferation during tubulogenesis. The kidney perfusion bioreactor permits non-invasive sampling of medium for biochemical assessment, and multiple inlet ports allow alternative retrograde seeding through the renal vein or ureter. These protocols can be used to recellularize kidney scaffolds with a variety of cell types, including vascular endothelial, tubular epithelial, and stromal fibroblasts, for rapid evaluation within this system.
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Affiliation(s)
- Joseph S Uzarski
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University; Department of Surgery, Feinberg School of Medicine, Northwestern University
| | - Jimmy Su
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University; Department of Surgery, Feinberg School of Medicine, Northwestern University; Department of Biomedical Engineering, Northwestern University; Simpson Querrey Institute for BioNanotechnology in Medicine, Northwestern University
| | - Yan Xie
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University; Department of Surgery, Feinberg School of Medicine, Northwestern University
| | - Zheng J Zhang
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University; Department of Surgery, Feinberg School of Medicine, Northwestern University
| | - Heather H Ward
- Department of Internal Medicine, University of New Mexico HSC
| | | | - William M Miller
- Department of Chemical and Biological Engineering, Northwestern University; Chemistry of Life Processes Institute, Northwestern University
| | - Jason A Wertheim
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University; Department of Surgery, Feinberg School of Medicine, Northwestern University; Department of Biomedical Engineering, Northwestern University; Simpson Querrey Institute for BioNanotechnology in Medicine, Northwestern University; Chemistry of Life Processes Institute, Northwestern University; Department of Surgery, Jesse Brown VA Medical Center;
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Burgess TE, Miller WM. Too much technology--or just enough? Identifying hemoglobin variants through routine and advanced laboratory techniques. MLO Med Lab Obs 2015; 47:14-16. [PMID: 26399019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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40
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Uzarski JS, Bijonowski BM, Wang B, Ward HH, Wandinger-Ness A, Miller WM, Wertheim JA. Dual-Purpose Bioreactors to Monitor Noninvasive Physical and Biochemical Markers of Kidney and Liver Scaffold Recellularization. Tissue Eng Part C Methods 2015; 21:1032-43. [PMID: 25929317 DOI: 10.1089/ten.tec.2014.0665] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Analysis of perfusion-based bioreactors for organ engineering and a detailed evaluation of physical and biochemical parameters that measure dynamic changes within maturing cell-laden scaffolds are critical components of ex vivo tissue development that remain understudied topics in the tissue and organ engineering literature. Intricately designed bioreactors that house developing tissue are critical to properly recapitulate the in vivo environment, deliver nutrients within perfused media, and monitor physiological parameters of tissue development. Herein, we provide an in-depth description and analysis of two dual-purpose perfusion bioreactors that improve upon current bioreactor designs and enable comparative analyses of ex vivo scaffold recellularization strategies and cell growth performance during long-term maintenance culture of engineered kidney or liver tissues. Both bioreactors are effective at maximizing cell seeding of small-animal organ scaffolds and maintaining cell survival in extended culture. We further demonstrate noninvasive monitoring capabilities for tracking dynamic changes within scaffolds as the native cellular component is removed during decellularization and model human cells are introduced into the scaffold during recellularization and proliferate in maintenance culture. We found that hydrodynamic pressure drop (ΔP) across the retained scaffold vasculature is a noninvasive measurement of scaffold integrity. We further show that ΔP, and thus resistance to fluid flow through the scaffold, decreases with cell loss during decellularization and correspondingly increases to near normal values for whole organs following recellularization of the kidney or liver scaffolds. Perfused media may be further sampled in real time to measure soluble biomarkers (e.g., resazurin, albumin, or kidney injury molecule-1) that indicate degree of cellular metabolic activity, synthetic function, or engraftment into the scaffold. Cell growth within bioreactors is validated for primary and immortalized cells, and the design of each bioreactor is scalable to accommodate any three-dimensional scaffold (e.g., synthetic or naturally derived matrix) that contains conduits for nutrient perfusion to deliver media to growing cells and monitor noninvasive parameters during scaffold repopulation, broadening the applicability of these bioreactor systems.
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Affiliation(s)
- Joseph S Uzarski
- 1 Comprehensive Transplant Center, Northwestern University Feinberg School of Medicine , Chicago, Illinois
- 2 Department of Surgery, Northwestern University Feinberg School of Medicine , Chicago, Illinois
| | - Brent M Bijonowski
- 1 Comprehensive Transplant Center, Northwestern University Feinberg School of Medicine , Chicago, Illinois
- 2 Department of Surgery, Northwestern University Feinberg School of Medicine , Chicago, Illinois
| | - Bo Wang
- 1 Comprehensive Transplant Center, Northwestern University Feinberg School of Medicine , Chicago, Illinois
- 2 Department of Surgery, Northwestern University Feinberg School of Medicine , Chicago, Illinois
| | - Heather H Ward
- 3 Department of Internal Medicine, University of New Mexico HSC , Albuquerque, New Mexico
| | | | - William M Miller
- 5 Department of Chemical and Biological Engineering, Northwestern University , Evanston, Illinois
- 6 Chemistry of Life Processes Institute, Northwestern University , Evanston, Illinois
| | - Jason A Wertheim
- 1 Comprehensive Transplant Center, Northwestern University Feinberg School of Medicine , Chicago, Illinois
- 2 Department of Surgery, Northwestern University Feinberg School of Medicine , Chicago, Illinois
- 6 Chemistry of Life Processes Institute, Northwestern University , Evanston, Illinois
- 7 Department of Surgery, Jesse Brown VA Medical Center , Chicago, Illinois
- 8 Simpson Querrey Institute for BioNanotechnology in Medicine, Northwestern University , Chicago, Illinois
- 9 Department of Biomedical Engineering, Northwestern University , Evanston, Illinois
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Abdul MMS, Soni DS, Miller WM, Passini BA, Patel PA, Koeller RG, Baker DM, Miller DT, Pujol TJ, Barnes JT, Johnson RJ, Wagganer JD. Traditional Vs. Suspended Push-up Muscle Activation In Collegiate Female Soccer Players And Gymnasts. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000477729.68655.1b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Barnes JT, Wagganer JD, Loenneke JP, Miller WM, Syed Abdul MM, Soni DS. Validity Of A Joint Diameter-based System For The Measurement Of Body Composition. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000476510.06827.be] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Miller WM, Abdul MM, Soni DD, Wagganer JD, Hoover BJ, Nguyen DT. Effects Of High-intensity Interval Training (HIT) On Maximal Oxygen Consumption In Cardiac Rehabilitation Patients. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000466162.14522.34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Caralt M, Uzarski JS, Iacob S, Obergfell KP, Berg N, Bijonowski BM, Kiefer KM, Ward HH, Wandinger-Ness A, Miller WM, Zhang ZJ, Abecassis MM, Wertheim JA. Optimization and critical evaluation of decellularization strategies to develop renal extracellular matrix scaffolds as biological templates for organ engineering and transplantation. Am J Transplant 2015; 15:64-75. [PMID: 25403742 PMCID: PMC4276475 DOI: 10.1111/ajt.12999] [Citation(s) in RCA: 159] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 08/14/2014] [Accepted: 08/30/2014] [Indexed: 01/25/2023]
Abstract
The ability to generate patient-specific cells through induced pluripotent stem cell (iPSC) technology has encouraged development of three-dimensional extracellular matrix (ECM) scaffolds as bioactive substrates for cell differentiation with the long-range goal of bioengineering organs for transplantation. Perfusion decellularization uses the vasculature to remove resident cells, leaving an intact ECM template wherein new cells grow; however, a rigorous evaluative framework assessing ECM structural and biochemical quality is lacking. To address this, we developed histologic scoring systems to quantify fundamental characteristics of decellularized rodent kidneys: ECM structure (tubules, vessels, glomeruli) and cell removal. We also assessed growth factor retention--indicating matrix biofunctionality. These scoring systems evaluated three strategies developed to decellularize kidneys (1% Triton X-100, 1% Triton X-100/0.1% sodium dodecyl sulfate (SDS) and 0.02% Trypsin-0.05% EGTA/1% Triton X-100). Triton and Triton/SDS preserved renal microarchitecture and retained matrix-bound basic fibroblast growth factor and vascular endothelial growth factor. Trypsin caused structural deterioration and growth factor loss. Triton/SDS-decellularized scaffolds maintained 3 h of leak-free blood flow in a rodent transplantation model and supported repopulation with human iPSC-derived endothelial cells and tubular epithelial cells ex vivo. Taken together, we identify an optimal Triton/SDS-based decellularization strategy that produces a biomatrix that may ultimately serve as a rodent model for kidney bioengineering.
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Affiliation(s)
- Mireia Caralt
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611,Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611,Servei Cirurgia HepatoBilioPancreatica i Trasplantaments. Hospital Universitari Vall Hebron. Universitat Autonoma de Barcelona. Spain
| | - Joseph S. Uzarski
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611,Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611
| | - Stanca Iacob
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611,Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611
| | - Kyle P. Obergfell
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611
| | - Natasha Berg
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611
| | - Brent M. Bijonowski
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611,Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611
| | - Kathryn M. Kiefer
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611
| | - Heather H. Ward
- Department of Internal Medicine, University of New Mexico, Albuquerque, NM, 87131
| | | | - William M. Miller
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, 60201,Chemistry of Life Processes Institute, Northwestern University, Evanston, IL, 60201
| | - Zheng J. Zhang
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611,Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611
| | - Michael M. Abecassis
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611,Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611
| | - Jason A. Wertheim
- Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611,Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611,Chemistry of Life Processes Institute, Northwestern University, Evanston, IL, 60201,Department of Surgery, Jesse Brown VA Medical Center, Chicago, IL, 60612,Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, IL, 60611,Department of Biomedical Engineering, Northwestern University, Evanston, IL, 60201,Address for correspondence: Jason A. Wertheim, M.D., Ph.D., 676 St. Clair St. Suite 1900, Chicago, Illinois 60611, Telephone: (312) 695-0257, Fax: (312) 503-3366,
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Finkielsztein A, Schlinker AC, Zhang L, Miller WM, Datta SK. Human megakaryocyte progenitors derived from hematopoietic stem cells of normal individuals are MHC class II-expressing professional APC that enhance Th17 and Th1/Th17 responses. Immunol Lett 2014; 163:84-95. [PMID: 25454068 DOI: 10.1016/j.imlet.2014.11.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 11/21/2014] [Indexed: 01/01/2023]
Abstract
Platelets, like stromal cells, present antigen only via MHC class I, but the immune potential of their progenitors has not been explored in humans. We derived CD34(+)CD117(+)CD41(+)CD151(+) megakaryocyte progenitors (MKp) in vitro from mobilized peripheral blood hematopoietic stem and progenitor cells (HSPC) of normal subjects using culture conditions akin to bone marrow niche, or organs that support extramedullary hematopoiesis. The MKp expressed MHC Class II in contrast to platelets and functioned as professional APC before they matured further. Moreover, MKp constitutively expressed mRNA encoding mediators for human Th17 expansion, including IL-1, IL-18, IL-6, TGFβ, IL-23, BAFF, and COX2. MKp also expressed high levels of type I interferon and IRF5 mRNA. In contrast to platelets, MKp augmented the expansion of Th17, Th1, and potent Th17/Th1 double-positive cells in normal PBMC and CD4 line T cells from normal subjects or lupus patients. The Th cell augmentation involved pre-committed memory cells, and was significant although modest, because only non-cognate MKp-T cell interactions could be studied, under non-polarizing conditions. Importantly, the MKp-mediated expansion was observed in the presence or absence of direct MKp-T cell contact. Furthermore, MKp augmented Th17 responses against Candida albicans, a serious opportunistic pathogen. These results indicate an immunologic role of MKp in situations associated with extramedullary hematopoiesis and mobilization of HSPC.
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Affiliation(s)
- Ariel Finkielsztein
- Division of Rheumatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Alaina C Schlinker
- Department of Chemical and Biological Engineering, McCormick School of Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Li Zhang
- Division of Rheumatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - William M Miller
- Department of Chemical and Biological Engineering, McCormick School of Engineering, Northwestern University, Evanston, IL 60208, USA; Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL 60611, USA
| | - Syamal K Datta
- Division of Rheumatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA; Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.
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Schlinker AC, Radwanski K, Wegener C, Min K, Miller WM. Separation of in-vitro-derived megakaryocytes and platelets using spinning-membrane filtration. Biotechnol Bioeng 2014; 112:788-800. [PMID: 25312394 DOI: 10.1002/bit.25477] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 09/22/2014] [Accepted: 09/30/2014] [Indexed: 02/06/2023]
Abstract
In-vitro-derived platelets (PLTs) could potentially overcome problems associated with donated PLTs, including contamination and alloimmunization. Although several groups have produced functional PLTs from stem cells in vitro, the challenge of developing this technology to yield transfusable PLT units has yet to be addressed. The asynchronous nature of in vitro PLT generation makes a single harvest point infeasible for collecting PLTs as soon as they are formed. The current standard of performing manual centrifugations to separate PLTs from nucleated cells at multiple points during culture is labor-intensive, imprecise, and difficult to standardize in accordance with current Good Manufacturing Practices (cGMP). In an effort to develop a more effective method, we adapted a commercially-available, spinning-membrane filtration device to separate in-vitro-derived PLTs from nucleated cells and recover immature megakaryocytes (MKs), the precursor cells to PLTs, for continued culture. Processing a mixture of in-vitro-derived MKs and PLTs on the adapted device yielded a pure PLT population and did not induce PLT pre-activation. MKs recovered from the separation process were unaffected with respect to viability and ploidy, and were able to generate PLTs after reseeding in culture. Being able to efficiently harvest in-vitro-derived PLTs brings this technology one step closer to clinical relevance.
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Affiliation(s)
- Alaina C Schlinker
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Rd., Tech E136, Evanston, Illinois, 60208-3120
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Duncan MT, Shin S, Wu JJ, Mays Z, Weng S, Bagheri N, Miller WM, Shea LD. Dynamic transcription factor activity profiles reveal key regulatory interactions during megakaryocytic and erythroid differentiation. Biotechnol Bioeng 2014; 111:2082-94. [PMID: 24853077 DOI: 10.1002/bit.25262] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 02/23/2014] [Accepted: 03/31/2014] [Indexed: 01/19/2023]
Abstract
The directed differentiation toward erythroid (E) or megakaryocytic (MK) lineages by the MK-E progenitor (MEP) could enhance the ex vivo generation of red blood cells and platelets for therapeutic transfusions. The lineage choice at the MEP bifurcation is controlled in large part by activity within the intracellular signal transduction network, the output of which determines the activity of transcription factors (TFs) and ultimately gene expression. Although many TFs have been implicated, E or MK differentiation is a complex process requiring multiple days, and the dynamics of TF activities during commitment and terminal maturation are relatively unexplored. Herein, we applied a living cell array for the large-scale, dynamic quantification of TF activities during MEP bifurcation. A panel of hematopoietic TFs (GATA-1, GATA-2, SCL/TAL1, FLI-1, NF-E2, PU.1, c-Myb) was characterized during E and MK differentiation of bipotent K562 cells. Dynamic TF activity profiles associated with differentiation towards each lineage were identified, and validated with previous reports. From these activity profiles, we show that GATA-1 is an important hub during early hemin- and PMA-induced differentiation, and reveal several characteristic TF interactions for E and MK differentiation that confirm regulatory mechanisms documented in the literature. Additionally, we highlight several novel TF interactions at various stages of E and MK differentiation. Furthermore, we investigated the mechanism by which nicotinamide (NIC) promoted terminal MK maturation using an MK-committed cell line, CHRF-288-11 (CHRF). Concomitant with its enhancement of ploidy, NIC strongly enhanced the activity of three TFs with known involvement in terminal MK maturation: FLI-1, NF-E2, and p53. Dynamic profiling of TF activity represents a novel tool to complement traditional assays focused on mRNA and protein expression levels to understand progenitor cell differentiation.
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Affiliation(s)
- Mark T Duncan
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208
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Abdul MMS, Soni D`S, Miller WM, Passini BA, Patel PA, Koeller RG, Baker DM, Miller DT, Pujol TJ, Barnes JT, Johnson RJ, Wagganer JD. Traditional Vs Suspended Push Muscle Activation In Sedentary And Collegiate Female Soccer Players. Med Sci Sports Exerc 2014. [DOI: 10.1249/01.mss.0000493749.46007.92] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Soni DS, Abdul MMS, Miller WM, Wagganer JD, Pujol TJ, Langenfeld ME, Barnes JT, Loenneke JP, Logan WV. Predicting Maximal Oxygen Consumption In Normal Weight Cyclists Using Lean Arm Mass. Med Sci Sports Exerc 2014. [DOI: 10.1249/01.mss.0000496314.71976.e1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Miller WM, Abdul MM, Wagganer JD, Pujol TJ, Langenfeld ME, Barnes JT, Loenneke JP, Logan WV. Predicting Maximal Oxygen Consumption in Normal Weight Cyclists Using Lean Leg Mass. Med Sci Sports Exerc 2014. [DOI: 10.1249/01.mss.0000496309.41482.60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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