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Dive into the research topics where Daniel B. Hollander is active.

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Featured researches published by Daniel B. Hollander.


Medicine and Science in Sports and Exercise | 2003

Hormonal responses from concentric and eccentric muscle contractions

Robert J. Durand; V. Daniel Castracane; Daniel B. Hollander; James L. Tryniecki; Marcas M. Bamman; Sarah O Neal; Edward P. Hebert; Robert R. Kraemer

UNLABELLED Intense resistance exercise can acutely increase testosterone (T), free testosterone (FT), and growth hormone (GH) concentrations, but there are few investigations concerning acute endocrine responses to concentric (CON) and eccentric (ECC) contractile actions. PURPOSE The purpose of the study was to compare acute anabolic hormonal responses to bouts of dynamic CON and ECC contractions from multiple exercises at the same absolute load. METHODS Ten young men (age: 24.7 +/- 1.2 yr, weight: 85.45 +/- 24.2 kg, and height: 178 +/- 0.2 cm) completed two trials in counterbalanced fashion consisting of only CON or ECC contractions at the same absolute workload. Subjects performed four sets of 12 repetitions of bench press, leg extension, military press, and leg curl at 80% of a 10-repetition maximum with 90-s rest periods. Blood samples were collected pre-, post-, and 15-min postexercise. RESULTS There were significant increases in GH, T, and FT and lactate for both trials, but only GH and lactate were greater for the CON trial. CONCLUSION CON exercise increases GH concentrations to a much greater extent than ECC exercise at the same absolute load, and it is likely that greater GH responses were related to intensity rather than mode of contraction. Also, CON and ECC dynamic contraction trials at the same absolute workload elicited similar small but significant increases in T and FT, indicating that the greater metabolic stress produced by during the CON trial did not affect these hormone responses.


Endocrine | 2004

Ghrelin and Other Glucoregulatory Hormone Responses to Eccentric and Concentric Muscle Contractions

Robert R. Kraemer; Robert J. Durand; Daniel B. Hollander; James L. Tryniecki; Edward P. Hebert; V. D. Castracane

Objective: Heavy resistance exercise increases growth hormone (GH) and blood glucose levels. Ghrelin is an endogenous ligand for the GH secretagory receptor that stimulates growth hormone release. Circulating ghrelin levels are suppressed by insulin and glucose. The study was conducted to determine effects of concentric (CON) and eccentric (ECC) muscle actions at the same absolute workload on circulating ghrelin and glucose as well as related glucoregulatory peptides.Methods: Ten-RM loads for bench press, leg extension, military press, and leg curl were obtained from nine males, mean age 25.±1.2 yr and body fat 17.2±1.6%. Subjects then completed two experimental trials of either CON or ECC contractions at the same absolute workload. Subjects performed four sets of 12 repetitions for each exercise at 80% of a 10-RM with 90 s rest periods. A pulley system or steel levers were positioned on each machine to raise or lower the weight so only CON or ECC contractions were performed. Pre-, post-, and 15-min post-exercise blood samples were collected.Results: Ghrelin did not increase in response to either muscle action and actually declined during the CON trial. Glucose and insulin increased regardless of the form of muscle action, but amylin and C-peptide did not change.Conclusions: Data indicate that ghrelin does not contribute to moderate resistance exercise-induced increases in growth hormone, whether from CON or ECC muscle actions. Results suggest that with a moderate loading protocol both CON and ECC muscle actions performed at the same absolute workload elevate glucose and insulin concentrations, but are not related to post-CON exercise ghrelin suppression.


Medicine and Science in Sports and Exercise | 2003

Rpe, pain, and physiological adjustment to concentric and eccentric contractions

Daniel B. Hollander; Robert J. Durand; James L. Trynicki; Deborah Larock; V. Daniel Castracane; Edward P. Hebert; Robert R. Kraemer

PURPOSE The purpose of the study was to compare perceptual (RPE and pain), cardiac (heart rate), lactate, and endocrine (cortisol) responses with concentric (CON) and eccentric (ECC) resistance exercise protocols using the same absolute workload. METHODS Eight healthy men with resistance-training experience participated in the study. Subjects completed two experimental trials consisting of either CON contractions or ECC contractions at the same absolute workload for each of four exercises: bench press, leg extension, military press, and leg curl. Subjects performed four sets of 12 repetitions at 80% of 10-RM with 90-s rest periods. Blood samples were taken before, immediately after, and 15-min postexercise. RESULTS There was a significant trial effect for RPE, with CON exercise eliciting a higher RPE than ECC exercise (6.71 +/- 0.51 and 4.10 +/- 0.27, respectively). A significant trial effect was also demonstrated for pain, with CON exercise producing a higher pain rating than ECC exercise (5.59 +/- 0.41 and 3.23 +/- 0.27, respectively). Significantly higher heart rates and lactates were also demonstrated during the CON trial. For cortisol, a significant interaction was revealed between the pre- and immediate posttrial measures but not an overall trial effect. Correlational analyses revealed a significant relationship between RPE and pain for both trials. CONCLUSIONS CON exercise elicits greater perceptual (higher RPE and pain rating), cardiac, lactate and cortisol response than ECC exercise at the same absolute workload. Data demonstrate that relative to absolute load, RPE and pain respond to resistance exercise in a similar fashion. Additionally, physiological cues are consistent with these perceptual data.


Journal of Strength and Conditioning Research | 2007

The acute effects of twenty-four hours of sleep loss on the performance of national-caliber male collegiate weightlifters.

Peter A. Blumert; Aaron J. Crum; Mark Ernsting; Jeff S. Volek; Daniel B. Hollander; Erin E. Haff; G. Gregory Haff

Currently, the degree to which sleep loss influences weightlifting performance is unknown. This study compared the effects of 24 hours of sleep loss on weight- lifting performance and subjective ratings of psychological states pre-exercise and postexercise in national-caliber male collegiate weightlifters. Nine males performed a maximal weightlifting protocol following 24 hours of sleep loss and a night of normal sleep. The subjects participated in a randomized, counterbalanced design with each sleep condition separated by 7 days. Testosterone and cortisol levels were quantified prior to, immediately after, and 1 hour after the resistance training session. Additionally, profile of mood states and subjective sleepiness were evaluated at the same time points. The resistance training protocol consisted of several sets of snatches, clean and jerks, and front squats. Performance was evaluated as individual exercise volume load, training intensity and overall workout volume load, and training intensity. During each training session the maximum weight lifted for the snatch, clean and jerk, and front squat were noted. No significant differences were found for any of the performance variables. A significant decrease following the sleep condition was noted for cortisol concentration immediately after and 1 hour postexercise. Vigor, fatigue, confusion, total mood disturbance, and sleepiness were all significantly altered by sleep loss. These data suggest that 24 hours of sleep loss has no adverse effects on weightlifting performance. If an athlete is in an acute period of sleep loss, as noticed by negative mood disturbances, it may be more beneficial to focus on the psychological (motivation) rather than the physiological aspect of the sport.


Journal of Strength and Conditioning Research | 2007

Maximal eccentric and concentric strength discrepancies between young men and women for dynamic resistance exercise.

Daniel B. Hollander; Robert R. Kraemer; Marcus W. Kilpatrick; Zaid G. Ramadan; Greg V. Reeves; Michelle Francois; Edward Hebert; James L. Tryniecki

Although research has demonstrated that isokinetic eccentric (ECC) strength is 20–60% greater than isokinetic concentric (CON) strength, few data exist comparing these strength differences in standard dynamic resistance exercises. The purpose of the study was to determine the difference in maximal dynamic ECC and CON strength for 6 different resistance exercises in young men and women. Ten healthy young men (mean ± SE, 25.30 ± 1.34 years), and 10 healthy young women (mean ± SE, 23.40 ± 1.37 years) who were regular exercisers with resistance training experience participated in the study. Two sessions were performed to determine CON and ECC 1 repetitions maximum for latissimus pull-down (LTP), leg press (LP), bench press (BP), leg extension (LE), seated military press (MP), and leg curl (LC) exercises. Maximal ECC and maximal CON strength were determined on weight stack machines modified to isolate ECC and CON contractions using steel bars and pulleys such that only 1 type of contraction was performed. Within 2 weeks, participants returned and completed a retest trial in a counterbalanced fashioned. Test-retest reliability was excellent (r = 0.99) for all resistance exercise trials. Men demonstrated 20–60% greater ECC than CON strength (LTP = 32%, LP = 44%, BP = 40%, LE = 35%, MP = 49%, LC = 27%). Womens strength exceeded the proposed parameters for greater ECC strength in 4 exercises, p < 0.05 (LP = 66%, BP = 146%, MP = 161%, LC = 82%). The ECC/CON assessment could help coaches capitalize on muscle strength differences in young men and women during training to aid in program design and injury prevention and to enhance strength development.


Journal of Strength and Conditioning Research | 2010

Partial occlusion during resistance exercise alters effort sense and pain.

Daniel B. Hollander; Gregory V Reeves; Jordan D. Clavier; Michelle Francois; Craig Thomas; Robert R. Kraemer

Hollander, DB, Reeves, GV, Clavier, JD, Francois, MR, Thomas, C, and Kraemer, RR. Partial occlusion during resistance exercise alters effort sense and pain. J Strength Cond Res 24(1): 235-243, 2010-The purpose of the study was to determine how manipulation of peripheral blood flow during resistance exercise using a light load affected perception and physiological measures compared with moderate load resistance exercise and a control trial. Seven subjects performed a 3 (session) by 2 (biceps curls and calf extensions) within-subjects study that was randomized and counterbalanced across 3 weeks. The 3 sessions included (a) light resistance exercise (3 sets to failure) at 30% of 1 repetition maximum (1RM) with partial occlusion (LRO), (b) moderate resistance at 70% of 1RM with no occlusion (MR), and (c) partial occlusion without exercise (OO). Ratings of perceived exertion (RPE), pain, and heart rate were assessed immediately after each set, whereas blood samples were taken before, immediately after, and 15 minutes after exercise. Results demonstrated that RPE and pain were lower in the OO condition than that in the MR and LRO conditions for biceps curls and calf extensions, Fs(2,24) = 22.75, 20.86, ps < 0.0001 and Fs(2,24) = 18.95, 24.52, ps < 0.01; however, no significant differences were noted between MR and LRO conditions. Heart rate was significantly higher for the LRO condition when compared with the MR trial, F(2,18) 20.12, p < 0.001. Results suggest that when partial vascular occlusion with a light load was applied, both pain and effort sense were altered to a similar degree as moderate loads but no occlusion. The practical application of results were that individuals may be better able to tolerate perceptual change at low loads with partial occlusion because joint stress may be minimized while local muscle metabolic demands increase, making resistance training maximally effective and minimally stressful on joints. Perceptual tracking of effort and pain may aid coaches who attempt this protocol.


Journal of Strength and Conditioning Research | 2009

Effects of Gender on Physiological Responses to Strenuous Circuit Resistance Exercise and Recovery

Angelique R Ortego; Demetra K Dantzler; Anne Zaloudek; Jamie Tanner; Tahir Khan; Rituraj Panwar; Daniel B. Hollander; Robert R. Kraemer

Ortego, AR, Dantzler, DK, Zaloudek, A, Tanner, J, Khan, T, Panwar, R, Hollander, DB, and Kraemer, RR. Effects of gender on physiological responses to strenuous circuit resistance exercise and recovery. J Strength Cond Res 23(3): 932-938, 2009-Few studies have focused upon the physiological responses to circuit weight training (CWT) in men and women, and an investigation of possible gender differences could lead to optimal exercise prescriptions and improved adaptation outcomes. The purpose of the study was to determine the effects of gender on cardiovascular and metabolic responses to CWT and consequent recovery. Ten healthy men and 10 healthy women completed an initial session to collect descriptive data and determine a 12 repetition maximum (12RM) for 6 different upper- and lower-body resistance exercises. This was followed by 2 identical sessions of a CWT protocol on 2 separate days at least 48 hours apart. The first session was used to familiarize subjects with the equipment and the testing protocol. The second session was used to determine physiological responses. Each subject performed 10 repetitions of 6 exercises for 3 circuits at a 12RM load. &OV0312;o2 and respiratory exchange ratio (RER) were continuously monitored, whereas heart rate (HR) and blood pressure (BP) were taken at the end of each circuit. Across the exercise session, men revealed greater absolute and relative &OV0312;o2, relative lean body mass &OV0312;o2, systolic BP (SBP), RER, and recovery &OV0312;o2 when compared with the female subjects. There were no differences in HR, diastolic BP (DBP), or recovery RER. The present study provides a greater insight into gender differences in cardiovascular and metabolic responses to circuit weight training. These gender differences should be taken into consideration for development of CWT protocols for men and women.


Journal of Strength and Conditioning Research | 2008

Load rather than contraction type influences rate of perceived exertion and pain.

Daniel B. Hollander; Marcus W. Kilpatrick; Zaid G. Ramadan; Gregory V Reeves; Michelle Francois; Anthony Blakeney; V. Daniel Castracane; Robert R. Kraemer

Hollander, DB, Kilpatrick, MW, Ramadan, ZG, Reeves, GV, Francois, M, Blakeney, A, Castracane, VD, and Kraemer, RR. Load rather than contraction type influences rate of perceived exertion and pain. J Strength Cond Res 22: 1184-1193, 2008-The purpose of the study was to determine whether muscle contraction type (concentric [CON] or eccentric [ECC]) or loading (relative or absolute) has a greater impact on the perceptual and metabolic responses to conventional resistance exercise. Additionally, overall effort, pain sensations, and specific pain descriptors were compared with physiological responses. Seven healthy men (mean ± SE, 25.71 ± 2.17 years) with resistance training experience completed 2 one-repetition maximum (1-RM) trials. Subsequently, 2 randomized, counterbalanced, experimental sessions were completed consisting of 4 sets of 10 repetitions for 6 exercises. These sessions were performed at 65% CON 1-RM for CON only contractions or 65% CON 1-RM + 20% for ECC contractions. Blood samples were taken pre, post, and 15 minutes postexercise. OMNI-RPE (OMNI-Res), CR-10 pain rating, McGill pain ratings, and heart rate (HR) were recorded after each set. A significant time effect occurred for OMNI-Res, pain, lactate, and HR (p < 0.05). No significant pattern emerged for the contraction type, except for higher HR and lactate immediately postexercise for the CON contractions. Physiological measures were not significantly related to perceptual measures. When considered with previous data, muscle loading rather than contraction type plays the primary role in perceptual alterations of effort sense and pain. Practical applications of the investigation are that strength and conditioning professionals may be able to load CON and ECC contractions in a relative fashion by increasing loads in the ECC portion by 20% above the CON load that would result in comparable perceptual experiences.


Journal of Strength and Conditioning Research | 2014

Comparison of Two-hand Kettlebell Exercise and Graded Treadmill Walking: Effectiveness as a Stimulus for Cardiorespiratory Fitness

James F. Thomas; Kurtis Larson; Daniel B. Hollander; Robert R. Kraemer

Abstract Thomas, JF, Larson, KL, Hollander, DB, and Kraemer, RR. Comparison of two-hand kettlebell exercise and graded treadmill walking: Effectiveness as a stimulus for cardiorespiratory fitness. J Strength Cond Res 28(4): 998–1006, 2014—Prevailing interest in the use of kettlebell (KB) exercises for rehabilitation and improvement of muscular strength has led to several recent studies, some suggesting that KB exercise may be useful for improvement of cardiorespiratory fitness. The purpose of this study was to determine whether KB exercise would produce similar cardiovascular stress to that of walking and thus provide an additional exercise mode for the improvement of cardiorespiratory fitness. It was hypothesized that a moderate-intensity, continuous KB protocol, would produce similar metabolic and cardiorespiratory responses as a brisk bout of graded treadmill (TM) walking, but greater rating of perceived exertion (RPE). Ten novice volunteers (5 men, 5 women) completed a preliminary session to determine body composition and V[Combining Dot Above]O2max and to familiarize participants with standardized KB exercise technique. Subsequently, they completed a 30-minute KB session that included 3 continuous 10-minute sets of 10 KB swings followed by 10 sumo deadlifts, with 3-minute rests between 10-minute exercise periods. The third session was a 30-minute TM regimen that began at the walking speed and 4% grade that matched the V[Combining Dot Above]O2 from the KB session and included 3-minute rest intervals after 10-minute TM exercise periods. V[Combining Dot Above]O2, respiratory exchange ratio, kcal·min−1, and blood pressure were similar for KB and moderate-intensity TM exercise, but RPE and heart rate were greater during KB exercise. Data indicate that a KB routine consisting of 2-hand swings and sumo deadlifts with 3-minute rest periods produces similar metabolic responses to those of a moderate-intensity TM walking protocol designed for the improvement of aerobic fitness.


Journal of Strength and Conditioning Research | 2004

Relationships between the flexed-arm hang and select measures of muscular fitness.

Jim Clemons; Charles A. Duncan; Oliver E. Blanchard; Wendel H. Gatch; Daniel B. Hollander; Janet L. Doucet

&NA; Clemons, J.M., C.A. Duncan, O.E. Blanchard, W.H. Gatch, D.B. Hollander, and J.L. Doucet. Relationships between the flexed‐arm hang and select measures of muscular fitness. J. Strength Cond. Res. 18(3):630–636. 2004.—The flexed‐arm hang (FAH) has been used to assess arm and shoulder girdle strength for 35 years despite little evidence to support its use. The purpose of this study was to determine what muscular fitness component, if any, was related to the FAH. The traditional overgrip chin‐above‐bar test and 5 different variations were compared with absolute strength (1 repetition maximum [1RM] lat pull down), relative strength (1RM·mass‐1), and muscle endurance (repetitions to failure at 70% of the 1RM). Sixty college‐age women volunteered for the study. Relationships were examined using Pearson Product Moment Correlation. No significant relationship was found between any of the FAH variations and absolute strength or muscle endurance; however, all FAH variations correlated significantly with relative strength (1RM·mass‐1). The strongest relationship was with the undergrip FAH timed to 90° of elbow extension (r = 0.72). Investigators concluded that the FAH is a test of weight‐relative muscular strength and appears unrelated to absolute strength or muscle endurance.

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Robert R. Kraemer

Southeastern Louisiana University

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Michelle Francois

Southeastern Louisiana University

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Edward P. Hebert

Southeastern Louisiana University

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James L. Tryniecki

Southeastern Louisiana University

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Robert J. Durand

Southeastern Louisiana University

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V. Daniel Castracane

Texas Tech University Health Sciences Center

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Zaid G. Ramadan

Southeastern Louisiana University

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Greg V. Reeves

Southeastern Louisiana University

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V. D. Castracane

Texas Tech University Health Sciences Center

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