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Mao J, Wang T, Wang Y, Kuan G. Effect of resistance training programs differing in set structure on muscular hypertrophy and performance in untrained young men. Front Physiol 2023; 14:1301535. [PMID: 38148897 PMCID: PMC10749963 DOI: 10.3389/fphys.2023.1301535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 11/28/2023] [Indexed: 12/28/2023] Open
Abstract
Purpose: This study aimed to compare the effects on muscle hypertrophy and muscular performance of two resistance training (RT) programs that differed only in set structure: traditional set structure (TS) vs. rest redistribution set structure (RR). Methods: Thirty untrained young men were pair-matched and randomly assigned to a TS (n = 15) or an RR (n = 15) protocol based on individual baseline measures. Participants trained for 8 weeks using the same total body RT routines performed twice weekly. The TS protocol comprised four sets of 10 repetitions per exercise with 120-s interset rest, and the RR involved eight sets of five repetitions per exercise with 51-s interset rest. Participants were tested pre- and post-intervention for body composition, regional muscle thickness, upper- and lower-body muscle maximal strength [1-repetition maximum (1RM)], mean power output and velocity at 75% 1RM and muscular endurance (repetitions to failure at 70% 1RM). Results: Compared to baseline, both groups exhibited equally significantly decreased body fat mass (p < 0.05), increased fat-free mass (p < 0.001), muscle thickness (p < 0.05), upper and lower-body muscular maximal strength (p < 0.001) and endurance performance (p < 0.001). However, both groups only increase the lower-body power output (p < 0.001) but not the upper-body (p > 0.05). No significant differences existed between groups for all measurements (p > 0.05). Conclusion: These results suggest that RR and TS groups have similar effects for improving muscle hypertrophy and performance in untrained young men.
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Affiliation(s)
- Jun Mao
- College of Kinesiology and Health, Capital University of Physical Education and Sports, Beijing, China
| | - Tianjiao Wang
- College of Kinesiology and Health, Capital University of Physical Education and Sports, Beijing, China
| | - Yidan Wang
- Faculty of Sports and Exercise Science, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Garry Kuan
- Exercise and Sports Science Programme, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
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Fairman CM, Owens OL, Kendall KL, Steele J, Schumpp AR, Latella C, Jones MT, Marcotte L, Dawson JM, Peddle-McIntyre CMJ, McDonnell KK. Hybrid delivery of cluster-set resistance training for individuals previously treated for lung cancer: the results of a single-arm feasibility trial. Pilot Feasibility Stud 2023; 9:177. [PMID: 37848969 PMCID: PMC10580552 DOI: 10.1186/s40814-023-01405-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 10/06/2023] [Indexed: 10/19/2023] Open
Abstract
BACKGROUND Individuals with non-small cell lung cancer (NSCLC) are burdened by long-lasting symptoms (e.g., dyspnea and fatigue) post-treatment. These symptoms often reduce physical activity levels and increase the risk of functional decline. Though we have previously proposed cluster-set resistance training to mitigate symptom burden in lung cancer, there is currently no data on the feasibility or acceptability of this mode of exercise in cancer. Therefore, the purpose of this study was to investigate the feasibility and acceptability of a hybrid-delivery home-based cluster-set resistance training program in individuals with NSCLC stages I-III (i.e., early stage). METHODS This study aimed to recruit individuals with NSCLC stages I-III post-treatment to participate in 8 weeks of home-based resistance training, 3 days per week. The program included supervised sessions in the participants' homes and virtual supervision via videoconferencing. The primary outcome measure of feasibility was evaluated through recruitment, retention, and intervention fidelity (i.e., proportion of exercise completed, relative to what was prescribed). Intervention acceptability (i.e., ease and quality of virtual delivery, level of difficulty, and home-based approach) was assessed using a 4-point Likert-type scale from "strongly disagree" to "strongly agree". RESULTS Fourteen participants were recruited over a 6-month period, with 11 completing the intervention (2 withdrew due to unrelated illness, 1 withdrew due to requiring active treatment), yielding a retention rate of 79%. Characteristics of the participants who completed the intervention (n = 11) were as follows: mean age: 71 ± 10 years, mean BMI: 29.1 ± 6.5, and average time since diagnosis was 62 ± 51 months. Of completers, 27% were male, and 36% were Black; 10 were stage I (91%), and one was stage II (9%). Mean session attendance was 86.4 ± 9.5%. Mean intervention fidelity was 83.1 ± 13.1%. With regard to acceptability, > 90% of participants positively rated all aspects of the intervention delivery. No adverse events related to exercise were recorded. CONCLUSIONS The hybrid delivery of a home-based resistance exercise program for individuals previously treated for early-stage NSCLC was found to be safe and feasible. Adaptations to the program for future interventions are required, particularly surrounding resistance exercise programming, and intervention delivery with home visits. TRIAL REGISTRATION ClinicalTrials.gov: NCT05014035 . Registered January 20, 2021.
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Affiliation(s)
- C M Fairman
- Department of Exercise Science, University of South Carolina, Columbia, USA.
| | - O L Owens
- College of Social Work, University of South Carolina, Columbia, USA
| | - K L Kendall
- Centre for Human Performance, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia
| | - J Steele
- Faculty of Sport, Health, and Social Science, Solent University, Southampton, UK
| | - A R Schumpp
- Department of Exercise Science, University of South Carolina, Columbia, USA
| | - C Latella
- Centre for Human Performance, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia
| | - M T Jones
- Department of Exercise Science, University of South Carolina, Columbia, USA
- Department of Kinesiology, The University of Alabama, Tuscaloosa, USA
| | - L Marcotte
- Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - J M Dawson
- Department of Exercise Science, University of South Carolina, Columbia, USA
| | - C M J Peddle-McIntyre
- Exercise Medicine Research Institute, School of Medical and Health Science, Edith Cowan University, Joondalup, Australia
| | - K K McDonnell
- College of Nursing, University of South Carolina, Columbia, USA
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Magalhães de Castro B, Dos Santos Rosa T, de Araújo TB, de Luca Corrêa H, de Deus LA, Neves RVP, Reis AL, Dos Santos RL, da Silva Barbosa JM, de Sousa Honorato F, da Motta Vilalva Mestrinho VM, Tzanno-Martins C, Navalta JW, Prestes J. Impact of cluster set resistance training on strength, functional capacity, metabolic and inflammatory state in older hemodialysis subjects: A randomized controlled clinical trial. Exp Gerontol 2023; 182:112297. [PMID: 37741557 DOI: 10.1016/j.exger.2023.112297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 08/22/2023] [Accepted: 09/20/2023] [Indexed: 09/25/2023]
Abstract
BACKGROUND AND AIMS Hemodialysis-associated neuromuscular dysfunction appears to be counteracted by resistance training (RT) in older patients with chronic kidney disease (CKD). Thus, the aim of the present study was to evaluate the impact of cluster-set RT protocol on anthropometric parameters, functional capacities, and biochemical variables in older patients with CKD. METHODS AND RESULTS Seventy-eight older patients (age: 57.55 ± 4.06 years) with CKD undergoing maintenance hemodialysis participated, and were randomly divided into control group (CG, N = 26), traditional RT (RT, N = 26) and cluster-set RT (RT-CS, N = 26) groups. Participants completed 24 weeks of RT three times per week, 1 h and 30 min before the hemodialysis session. Patients from the RT-CS group displayed increased adherence as compared to the RT group (66.35 % versus 61.73 %, p < 0.0001). There was an improvement of all anthropometric variables, handgrip strength, timed up and-go (TUG) and six-minute walking test (6MWT) following both training protocols when compared to control group and pre-intervention values. Fasting blood glucose decreased for both RT and RT-CS groups as compared with pre-intervention, without differences between training protocols and CG. Glycated hemoglobin, inflammatory cytokines, and triglycerides decreased in RT and RT-CS groups as compared with pre-intervention and CG, without differences between them. Furthermore, the RT-CS protocol resulted in a greater number of people who were responsive to training when compared to traditional training. CONCLUSIONS RT-CS is a clinically valuable tool to improve anthropometric parameters, handgrip strength, TUG, 6MWT, fasting blood glucose, and cytokines in CKD older patients.
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Affiliation(s)
| | - Thiago Dos Santos Rosa
- Department of Physical Education, Catholic University of Brasilia, Brasilia, DF, Brazil; Graduate Program in Genomic Science and Biotechnology
| | - Thaís Branquinho de Araújo
- Department of Physical Education, Catholic University of Brasilia, Brasilia, DF, Brazil; NephroClinics, Premium Nephrology Clinic, Brasilia, Brazil
| | - Hugo de Luca Corrêa
- Department of Physical Education, Catholic University of Brasilia, Brasilia, DF, Brazil
| | | | | | - Andrea Lucena Reis
- Department of Physical Education, Catholic University of Brasilia, Brasilia, DF, Brazil
| | | | | | | | | | | | - James W Navalta
- Department Kinesiology and Nutrition Sciences, University of Nevada, Las Vegas, NV, United States of America
| | - Jonato Prestes
- Department of Physical Education, Catholic University of Brasilia, Brasilia, DF, Brazil
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Way KL, Thomas HJ, Parker L, Maiorana A, Keske MA, Scott D, Reed JL, Tieng J, Hackett D, Hawkins T, Latella C, Cordina R, Tran DL. Cluster Sets to Prescribe Interval Resistance Training: A Potential Method to Optimise Resistance Training Safety, Feasibility and Efficacy in Cardiac Patients. SPORTS MEDICINE - OPEN 2023; 9:86. [PMID: 37725296 PMCID: PMC10509118 DOI: 10.1186/s40798-023-00634-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 09/04/2023] [Indexed: 09/21/2023]
Abstract
The integration of resistance training for cardiac patients leads to important health outcomes that are not optimally obtained with aerobic exercise; these include an increase in muscle mass, maintenance of bone mineral density, and improvements in muscular fitness parameters. Despite the proliferation of evidence supporting resistance exercise in recent decades, the implementation of resistance training is underutilised, and prescription is often sub-optimal in cardiac patients. This is frequently associated with safety concerns and inadequate methods of practical exercise prescription. This review discusses the potential application of cluster sets to prescribe interval resistance training in cardiac populations. The addition of planned, regular passive intra-set rest periods (cluster sets) in resistance training (i.e., interval resistance training) may be a practical solution for reducing the magnitude of haemodynamic responses observed with traditional resistance training. This interval resistance training approach may be a more suitable option for cardiac patients. Additionally, many cardiac patients present with impaired exercise tolerance; this model of interval resistance training may be a more suitable option to reduce fatigue, increase patient tolerance and enhance performance to these workloads. Practical strategies to implement interval resistance training for cardiac patients are also discussed. Preliminary evidence suggests that interval resistance training may lead to safer acute haemodynamic responses in cardiac patients. Future research is needed to determine the efficacy and feasibility of interval resistance training for health outcomes in this population.
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Affiliation(s)
- Kimberley L Way
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia.
- Exercise Physiology and Cardiovascular Health Lab, Division of Cardiac Prevention and Rehabilitation, University of Ottawa Heart Institute, Ottawa, ON, Canada.
| | - Hannah J Thomas
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia
| | - Lewan Parker
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia
| | - Andrew Maiorana
- Curtin School of Allied Health, Curtin University, Perth, WA, Australia
- Allied Health Department, Fiona Stanley Hospital, Perth, WA, Australia
| | - Michelle A Keske
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia
| | - David Scott
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, 3125, Australia
- School of Clinical Sciences at Monash Health, Monash University, Clayton, VIC, Australia
| | - Jennifer L Reed
- Exercise Physiology and Cardiovascular Health Lab, Division of Cardiac Prevention and Rehabilitation, University of Ottawa Heart Institute, Ottawa, ON, Canada
- School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
- School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada
| | - Jessica Tieng
- Epigenetics and RNA Biology Program, Centenary Institute, Camperdown, NSW, Australia
- Central Clinical School, The University of Sydney School of Medicine, Camperdown, NSW, 2006, Australia
| | - Daniel Hackett
- Discipline of Exercise and Sports Science, Sydney School of Health Sciences, Faculty of Medicine and Health, The University of Sydney, Camperdown, Australia
| | - Tess Hawkins
- Concord Centre for STRONG Medicine, Concord Repatriation General Hospital, Concord West, NSW, Australia
| | - Christopher Latella
- School of Health and Medical Sciences, Edith Cowan University, Joondalup, WA, Australia
| | - Rachael Cordina
- Central Clinical School, The University of Sydney School of Medicine, Camperdown, NSW, 2006, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, NSW, Australia
- Charles Perkins Centre, Heart Research Institute, Camperdown, NSW, Australia
| | - Derek L Tran
- Central Clinical School, The University of Sydney School of Medicine, Camperdown, NSW, 2006, Australia.
- Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, NSW, Australia.
- Charles Perkins Centre, Heart Research Institute, Camperdown, NSW, Australia.
- Human Performance Research Centre, School of Sport, Exercise and Rehabilitation, Faculty of Health, University of Technology Sydney, Moore Park, NSW, Australia.
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Personalizing Resistance Training Mitigates Neuromuscular and Perceived Fatigue: The Autoregulation Cluster Training Method. Int J Sports Physiol Perform 2023; 18:503-511. [PMID: 36918018 DOI: 10.1123/ijspp.2022-0382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 01/08/2023] [Accepted: 01/12/2023] [Indexed: 03/15/2023]
Abstract
PURPOSE To compare predetermined and autoregulated resistance training sessions on velocity loss and perceived fatigue. METHODS Twenty-six resistance-trained men completed 3 sessions including the back-squat and bench-press exercises matched for load (75% of 1-repetition maximum), volume (24 repetitions), and total rest (240 s). Sessions were randomly performed as traditional set (TRA), 3 sets of 8 repetitions with 120-second interset rests; cluster interset-rest redistribution (IRR), 6 clusters of 4 repetitions with 48-second between-clusters rests; and autoregulation cluster training (ACT), a personalized combination of clusters, repetitions per cluster, and between-clusters rest regulated on a velocity loss threshold. The comparative effects were evaluated on velocity loss outputs measured with a linear encoder and perceived fatigue responses reported using a single-item scale. RESULTS IRR and ACT induced less velocity loss than TRA (b = -2.09, P < .001). ACT also mitigated velocity loss more than IRR (b = -2.31, P < .001). The back squat resulted in greater velocity loss compared to the bench press (b = 1.83, P < .001). Perceived fatigue responses mirrored the pattern observed for the velocity loss outputs (IRR and ACT vs TRA: b = -0.64, P < .001; ACT vs IRR: b = -1.05, P < .001; back squat vs bench press: b = 0.46, P = .005). CONCLUSIONS IRR and ACT reduced neuromuscular and perceived fatigue, likely due to their cluster-set structures' embedding frequent windows of interset rest. However, the ACT was overall more effective, presumably given its personalized structure.
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Rappelt L, Held S, Leicht M, Wicker P, Donath L. Similar strength gains at lower perceived efforts via cluster set vs. traditional home-based online training: A 6 weeks randomized controlled trial. Front Sports Act Living 2022; 4:968258. [PMID: 36091869 PMCID: PMC9453863 DOI: 10.3389/fspor.2022.968258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 08/08/2022] [Indexed: 11/13/2022] Open
Abstract
Cluster Training (CT) has been shown to induce strength at lower perceived efforts compared to traditional training (TRT) with sets performed to repetition failure. These findings have not yet been extended to remote online training in middle-aged to older people. Thus the present study aimed at investigating whether a cluster set online training with bodyweight exercises is similar in its effectiveness a more demanding traditional strength training employed with a traditional set structure. A total of n = 21 participants (14 female, 55 ± 12 years, 76.4 ± 16.1 kg, 1.71 ± 0.10 m, 74 ± 72 min of activity/w) were randomly assigned to either a CT or volume-, load-, and work-to-rest-ratio-matched TRT. After an initial 6-week run-in-phase, all participants were engaged into an online live-instructed full-body workout twice a week (40 min each) for a period of 6 weeks. Rates of perceived efforts (RPE) were assessed for each session (session RPE; sRPE). Changes in maximal voluntary contraction (MVC) at leg press (LP) and abdominal press (AP) as well as one-minute-sit-to-stand and Y-Balance-Test (YBT) were compared between BASELINE and PRE (ΔRUN-IN) and between PRE and POST (ΔINTERVENTION). In LP, TRT showed greater improvements with large effect sizes in ΔINTERVENTION compared to ΔRUN-IN. In CT, greater improvements with moderate effects were found in ΔINTERVENTION compared to ΔRUN-IN. In AP, both CT and TRT showed larger improvements with large effect sizes in ΔINTERVENTION compared to ΔRUN-IN. In YBT, a significant and large main effect for time was found indicating larger improvements for ΔINTERVENTION compared to ΔRUN-IN. CT showed lower sRPE than TRT. Both CT and TRT led to similar adaptations in MVC and balance performance. However, the perceived effort of CT was rated lower than for TRT. Therefore, conducting resistance training with a cluster set structure seems to be a suitable approach for training programs in middle-aged and older people.
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Affiliation(s)
- Ludwig Rappelt
- Department of Intervention Research in Exercise Training, German Sport University Cologne, Cologne, Germany
| | - Steffen Held
- Department of Intervention Research in Exercise Training, German Sport University Cologne, Cologne, Germany
| | - Mario Leicht
- Department of Intervention Research in Exercise Training, German Sport University Cologne, Cologne, Germany
| | - Pamela Wicker
- Department of Sports Science, Bielefeld University, Bielefeld, Germany
- *Correspondence: Pamela Wicker
| | - Lars Donath
- Department of Intervention Research in Exercise Training, German Sport University Cologne, Cologne, Germany
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Fairman CM, Owens OL, Kendall KL, Steele J, Latella C, Jones MT, Marcotte L, Peddle-McIntyre CMJ, McDonnell KK. Study protocol: investigating the feasibility of a hybrid delivery of home-based cluster set resistance training for individuals previously treated for lung cancer. Pilot Feasibility Stud 2022; 8:102. [PMID: 35585562 PMCID: PMC9114285 DOI: 10.1186/s40814-022-01065-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 05/06/2022] [Indexed: 11/29/2022] Open
Abstract
Background Symptom burden remains a critical concern for individuals with non-small cell lung cancer (NSCLC) following the completion of treatment. The most common symptom clusters, dyspnea (shortness of breath) and fatigue, can contribute to physical decline, reductions in quality of life, and a higher risk of comorbidities and mortality. Dyspnea is a primary limiter of exercise capacity in individuals with lung cancer, resulting in exercise avoidance and an accelerated physical decline. As such, designing resistance training with cluster sets to mitigate symptoms of dyspnea and fatigue may result in improved exercise tolerance. Thus, maintaining the exercise stimulus via cluster sets, combined with improved tolerance of the exercise, could result in the maintenance of physical function and quality of life. The purpose of this study is to investigate the feasibility and preliminary efficacy of a hybrid-delivery home-based cluster-set resistance training program in individuals with NSCLC. Methods Individuals with NSCLC (n = 15), within 12 months of completion of treatment, will be recruited to participate in this single-arm feasibility trial. Participants will complete 8 weeks of home-based resistance training designed to minimize dyspnea and fatigue. The hybrid delivery of the program will include supervised sessions in the participants’ home and virtual supervision via video conferencing. The primary outcome of feasibility will be quantified by recruitment rates, retention, acceptability, and intervention fidelity. Exploratory outcomes (dyspnea, fatigue, quality of life, physical function, and body composition) will be assessed pre- and post-intervention. Discussion This study will provide important data on the feasibility of delivering this intervention and inform procedures for a future randomized controlled trial. Trial registration Record not yet public
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Affiliation(s)
- C M Fairman
- Department of Exercise Science, University of South Carolina, Columbia, USA.
| | - O L Owens
- College of Social Work, University of South Carolina, Columbia, USA
| | - K L Kendall
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia
| | - J Steele
- Faculty of Sport, Health, and Social Science, Solent University, Southampton, UK
| | - C Latella
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Australia
| | - M T Jones
- Department of Exercise Science, University of South Carolina, Columbia, USA.,Department of Kinesiology, The University of Alabama, Tuscaloosa, USA
| | - L Marcotte
- Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | | | - K K McDonnell
- College of Nursing, University of South Carolina, Columbia, USA
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8
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The Optimum Power Load: A Simple and Powerful Tool for Testing and Training. Int J Sports Physiol Perform 2021; 17:151-159. [PMID: 34942592 DOI: 10.1123/ijspp.2021-0288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 10/18/2021] [Accepted: 11/28/2021] [Indexed: 11/18/2022]
Abstract
PURPOSE The optimal power load is defined as the load that maximizes power output in a given exercise. This load can be determined through the use of various instruments, under different testing protocols. Specifically, the "optimum power load" (OPL) is derived from the load-velocity relationship, using only bar force and bar velocity in the power computation. The OPL is easily assessed using a simple incremental testing protocol, based on relative percentages of body mass. To date, several studies have examined the associations between the OPL and different sport-specific measures, as well as its acute and chronic effects on athletic performance. The aim of this brief review is to present and summarize the current evidence regarding the OPL, highlighting the main lines of research on this topic and discussing the potential applications of this novel approach for testing and training. CONCLUSIONS The validity and simplicity of OPL-based schemes provide strong support for their use as an alternative to more traditional strength-power training strategies. The OPL method can be effectively used by coaches and sport scientists in different sports and populations, with different purposes and configurations.
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Dello Iacono A, Ashcroft K, Zubac D. Ain't Just Imagination! Effects of Motor Imagery Training on Strength and Power Performance of Athletes during Detraining. Med Sci Sports Exerc 2021; 53:2324-2332. [PMID: 34033625 DOI: 10.1249/mss.0000000000002706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE This study aimed to investigate the effects of motor imagery (MI) training on strength and power performances of professional athletes during a period of detraining caused by the COVID-19 outbreak. METHODS Thirty male professional basketball players (age, 26.1 ± 6.2 yr) were randomly assigned to three counterbalanced groups: two MI training groups, who completed imagery training by mentally rehearsing upper and lower limb resistance training exercises loaded with either 85% of one repetition maximum (85%1RM) or optimum power loads (OPL), or a control group. For six consecutive weeks, although all groups completed two weekly sessions of high-intensity running, only the MI groups performed three additional MI sessions a week. Maximal strength and power output were measured through 1RM and OPL assessments in the back squat and bench press exercises with a linear positioning transducer. Vertical jump and throwing capabilities were assessed with the countermovement jump and the seated medicine ball throw tests, respectively. Kinesthetic and visual imagery questionnaires, and chronometry and rating of perceived effort scores were collected to evaluate MI vividness, MI ability, and perceived effort. RESULTS Physical performances improved significantly following both MI protocols (range, ~2% to ~9%), but were reduced in the control group, compared with preintervention (P ≤ 0.016). Moreover, interactions (time-protocol) were identified between the two MI groups (P ≤ 0.001). Whereas the 85%1RM led to greater effects on maximal strength measures than the OPL, the latter induced superior responses on measures of lower limb power. These findings were mirrored by corresponding cognitive and psychophysiological responses. CONCLUSIONS During periods of forced detraining, MI practice seems to be a viable tool to maintain and increase physical performance capacity among professional athletes.
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Affiliation(s)
- Antonio Dello Iacono
- School of Health and Life Sciences, University of the West of Scotland, Glasgow, UNITED KINGDOM
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10
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Strengthening the Case for Cluster Set Resistance Training in Aged and Clinical Settings: Emerging Evidence, Proposed Benefits and Suggestions. Sports Med 2021; 51:1335-1351. [PMID: 33983613 DOI: 10.1007/s40279-021-01455-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2021] [Indexed: 12/13/2022]
Abstract
Resistance training (RT) is a fundamental component of exercise prescription aimed at improving overall health and function. RT techniques such as cluster set (CS) configurations, characterized by additional short intra-set or inter-repetition rest intervals, have been shown to maintain acute muscular force, velocity, and 'power' outputs across a RT session, and facilitate positive longer-term neuromuscular adaptations. However, to date CS have mainly been explored from a human performance perspective despite potential for application in health and clinical exercise settings. Therefore, this current opinion piece aims to highlight emerging evidence and provide a rationale for why CS may be an advantageous RT technique for older adults, and across several neurological, neuromuscular, cardiovascular and pulmonary settings. Specifically, CS may minimize acute fatigue and adverse physiologic responses, improve patient tolerance of RT and promote functional adaptations (i.e., force, velocity, and power). Moreover, we propose that CS may be a particularly useful exercise rehabilitation technique where injury or illness, persistent fatigue, weakness and dysfunction exist. We further suggest that CS offer an alternative RT strategy that can be easily implemented alongside existing exercise/rehabilitation programs requiring no extra cost, minimal upskilling and/or time commitment for the patient and professional. In light of the emerging evidence and likely efficacy in clinical exercise practice, future research should move toward further direct investigation of CS-based RT in a variety of adverse health conditions and across the lifespan given the already demonstrated benefits in healthy populations.
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Why Are Masters Sprinters Slower Than Their Younger Counterparts? Physiological, Biomechanical, and Motor Control Related Implications for Training Program Design. J Aging Phys Act 2021; 29:708-719. [PMID: 33450731 DOI: 10.1123/japa.2020-0302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 09/08/2020] [Accepted: 10/02/2020] [Indexed: 11/18/2022]
Abstract
Elite sprint performances typically peak during an athlete's 20s and decline thereafter with age. The mechanisms underpinning this sprint performance decline are often reported to be strength-based in nature with reductions in strength capacities driving increases in ground contact time and decreases in stride lengths and frequency. However, an as-of-yet underexplored aspect of Masters sprint performance is that of age-related degradation in neuromuscular infrastructure, which manifests as a decline in both strength and movement coordination. Here, the authors explore reductions in sprint performance in Masters athletes in a holistic fashion, blending discussion of strength and power changes with neuromuscular alterations along with mechanical and technical age-related alterations. In doing so, the authors provide recommendations to Masters sprinters-and the aging population, in general-as to how best to support sprint ability and general function with age, identifying nutritional interventions that support performance and function and suggesting useful programming strategies and injury-reduction techniques.
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