1
|
Marcos-Pardo PJ, Espeso-García A, Vaquero-Cristóbal R, Abelleira-Lamela T, González-Gálvez N. The Effect of Resistance Training with Outdoor Fitness Equipment on the Body Composition, Physical Fitness, and Physical Health of Middle-Aged and Older Adults: A Randomized Controlled Trial. Healthcare (Basel) 2024; 12:726. [PMID: 38610148 PMCID: PMC11011249 DOI: 10.3390/healthcare12070726] [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: 02/07/2024] [Revised: 03/16/2024] [Accepted: 03/25/2024] [Indexed: 04/14/2024] Open
Abstract
This study examined the effect of outdoor-fitness-equipment-based resistance training on the health parameters of middle-aged and older adults, as well as analyzing the effect of age on the results found. A total of 149 volunteers were randomly assigned to the training (TG) and control (CG) groups. The TG performed two weekly sessions of resistance training for 8 weeks using outdoor fitness equipment, while the CG continued with their regular daily activities. Body composition was measured using DXA, and the maximal isometric voluntary contraction in knee extension, elbow flexion, and hand grip were assessed, along with the 4 m walk test, the Timed Up and Go Test, and the Short Form 36 Health Survey Questionnaire. The TG showed a significant increase in the lean mass index (p = 0.002) and maximal isometric voluntary contraction in both legs (p < 0.001) and arms (p < 0.001), as well as in physical functioning (p < 0.001) and the role physical dimension (p = 0.006) of the Short Form 36 Health Survey Questionnaire, compared to the CG, which showed a decrease in all these variables. In addition, the TG showed a greater decrease in fat mass (p < 0.001), fat mass index (p = 0.003), and the Timed Up and Go Test (p < 0.001) than the CG. Age conditioned the evolution of most of the variables analyzed (p < 0.05). In conclusion, resistance training with outdoor fitness equipment may be useful for improving the health of middle-aged and older adults, although age is a factor that could influence the adaptations found.
Collapse
Affiliation(s)
- Pablo J. Marcos-Pardo
- Centro de Investigación para el Bienestar y la Inclusión Social (CIBIS Research Center), SPORT Research Group (CTS-1024), Department of Education, Faculty of Education Sciences, University of Almería, 04120 Almería, Spain;
- Active Aging, Exercise and Health/HEALTHY-AGE Network, Consejo Superior de Deportes (CSD), Ministry of Culture and Sport of Spain, 28040 Madrid, Spain;
| | - Alejandro Espeso-García
- Injury Prevention in Sport Research Group (PRELEDE), Facultad de Deporte, UCAM Universidad Católica de Murcia, 30107 Murcia, Spain;
| | - Raquel Vaquero-Cristóbal
- Active Aging, Exercise and Health/HEALTHY-AGE Network, Consejo Superior de Deportes (CSD), Ministry of Culture and Sport of Spain, 28040 Madrid, Spain;
- Department of Physical Activity and Sport Sciences, Faculty of Sports Sciences, University of Murcia, 30720 Murcia, Spain
| | - Tomás Abelleira-Lamela
- Injury Prevention in Sport Research Group (PRELEDE), Facultad de Deporte, UCAM Universidad Católica de Murcia, 30107 Murcia, Spain;
| | - Noelia González-Gálvez
- Active Aging, Exercise and Health/HEALTHY-AGE Network, Consejo Superior de Deportes (CSD), Ministry of Culture and Sport of Spain, 28040 Madrid, Spain;
- Research Group on Health, Physical Activity, Fitness and Motor Behaviour (GISAFFCOM), Facultad de Deporte, UCAM Universidad Católica de Murcia, 30107 Murcia, Spain
| |
Collapse
|
2
|
Zhao H, Seo D, Okada J. Validity of using perceived exertion to assess muscle fatigue during back squat exercise. BMC Sports Sci Med Rehabil 2023; 15:14. [PMID: 36739396 PMCID: PMC9899404 DOI: 10.1186/s13102-023-00620-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 01/20/2023] [Indexed: 02/06/2023]
Abstract
The rating of perceived exertion (RPE) scale has been found to reflect physiological responses, and this study aimed to assess the validity of using the Borg CR-10 scale and velocity loss to evaluate muscle fatigue quantified by surface electromyography during back squat (BS) exercise. A total of 15 collegiate male athletes underwent three non-explosive BS tasks comprising low, medium, and high volumes at 65% of their one-repetition maximum. RPEs, spectral fatigue index (SFI), and velocity loss during BS exercise were assessed throughout the trials. Significant differences in overall RPE (p < 0.001) and average SFI (p < 0.05) were observed between the conditions, whereas no significant difference was observed in average velocity loss. Significant increases in RPE and SFI (p < 0.001) were observed within the exercise process, whereas a significant increase in velocity loss was not observed. Correlation analyses indicated a significant correlation between RPE and SFI obtained during exercise (r = 0.573, p < 0.001). However, no significant correlation was observed between velocity loss and SFI. These results demonstrated that RPE could be used as a muscle fatigue predictor in BS exercise, but that velocity loss may not reflect muscle fatigue correctly when participants cannot and/or are not required to perform BS explosively. Furthermore, practitioners should not use velocity loss as a muscle fatigue indicator in some resistance exercise situations, such as rehabilitation, beginner, and hypertrophy programs.
Collapse
Affiliation(s)
- Hanye Zhao
- grid.5290.e0000 0004 1936 9975Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama Japan ,grid.5290.e0000 0004 1936 9975Graduate School of Sport Sciences, Waseda University, Mikajima 2-579-15, Tokorozawa, Saitama 359-1192 Japan
| | - Dasom Seo
- grid.5290.e0000 0004 1936 9975Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama Japan
| | - Junichi Okada
- grid.5290.e0000 0004 1936 9975Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama Japan
| |
Collapse
|
3
|
Effects of acute taurine consumption on single bout of muscular endurance resistance exercise performance and recovery in resistance trained young male adults. BIOMEDICAL HUMAN KINETICS 2023. [DOI: 10.2478/bhk-2023-0010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023] Open
Abstract
Abstract
Study aim: This study investigated the effect of taurine supplementation on exercise performance and recovery from resistance exercise. The study was conducted with a cross-over design in a double-blind manner.
Material and methods: Ten resistance trained males (age 21.4 ± 2.01 years; BMI: 23.6 ± 2.5 kg/m²) ingested either a taurine (0.1g/kg) supplement or placebo (18 mg aspartame) prior to resistance exercise. Vertical jump, flexibility, balance, systolic blood pressure, diastolic blood pressure, heart rate (HR), maximal voluntary muscle contraction, speed, lactate, glucose and perceived soreness and strain were assessed. The subjects performed two exercise trials with 1 week wash out interval. Blood samples were collected at baseline and before each exercise (chest press, abdominal crunch and leg extension) to analyse plasma levels of lactate and glucose.
Results: Paired-T test results showed statistically significant increment (p < 0.05) in total volume (kg × #repetitions), chest press volume and leg extension volume. Repeated measure ANOVA results demonstrated statistically significant differences (p < 0.05) in lactate and flexibility in trial and time, and in maximal voluntary isometric muscle contraction (MVIC) test in time, trial and trial × time in favour taurine group. No statistically significant differences were found in cardiovascular parameters, glucose, and balance parameters (p > 0.05).
Conclusion: In conclusion, 0.1 g/kg of taurine consumption before resistance exercise could positively affect exercise performance by increasing exercise volume and reducing lactate levels.
Collapse
|
4
|
Jukic I, Castilla AP, Ramos AG, Van Hooren B, McGuigan MR, Helms ER. The Acute and Chronic Effects of Implementing Velocity Loss Thresholds During Resistance Training: A Systematic Review, Meta-Analysis, and Critical Evaluation of the Literature. Sports Med 2023; 53:177-214. [PMID: 36178597 PMCID: PMC9807551 DOI: 10.1007/s40279-022-01754-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/05/2022] [Indexed: 01/12/2023]
Abstract
BACKGROUND Velocity loss (VL) experienced in a set during resistance training is often monitored to control training volume and quantify acute fatigue responses. Accordingly, various VL thresholds are used to prescribe resistance training and target different training adaptations. However, there are inconsistencies in the current body of evidence regarding the magnitude of the acute and chronic responses to the amount of VL experienced during resistance training. OBJECTIVE The aim of this systematic review was to (1) evaluate the acute training volume, neuromuscular, metabolic, and perceptual responses to the amount of VL experienced during resistance training; (2) synthesize the available evidence on the chronic effects of different VL thresholds on training adaptations; and (3) provide an overview of the factors that might differentially influence the magnitude of specific acute and chronic responses to VL during resistance training. METHODS This review was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Five databases were searched, and studies were included if they were written in English, prescribed resistance training using VL, and evaluated at least one (1) acute training volume, neuromuscular, metabolic, or perceptual response or (2) training adaptation. Risk of bias was assessed using a modified Cochrane Collaboration's tool for assessing the risk of bias in randomized trials. Multilevel and multivariate meta-regressions were performed where possible. RESULTS Eighteen acute and 19 longitudinal studies met the inclusion criteria, of which only one had more than one risk of bias item assessed as high risk. Based on the included acute studies, it seems that the number of repetitions per set, blood lactate concentration, and rating of perceived exertion generally increase, while countermovement jump height, running sprint times, and velocity against fixed loads generally decrease as VL increases. However, the magnitude of these effects seems to be influenced, among other factors, by the exercise and load used. Regarding training adaptations, VL experienced during resistance training did not influence muscle strength and endurance gains. Increases in VL were associated with increases in hypertrophy (b = 0.006; 95% confidence interval [CI] 0.001, 0.012), but negatively affected countermovement jump (b = - 0.040; 95% CI - 0.079, - 0.001), sprint (b = 0.001; 95% CI 0.001, 0.002), and velocity against submaximal load performance (b = - 0.018; 95% CI - 0.029, - 0.006). CONCLUSIONS A graded relationship exists between VL experienced during a set and acute training volume, neuromuscular, metabolic, and perceptual responses to resistance training. However, choice of exercise, load, and individual trainee characteristics (e.g., training history) seem to modulate these relationships. The choice of VL threshold does not seem to affect strength and muscle endurance gains whereas higher VL thresholds are superior for enhancing hypertrophy, and lower VL thresholds are superior for jumping, sprinting, and velocity against submaximal loads performance. CLINICAL TRIAL REGISTRATION The original protocol was prospectively registered ( https://osf.io/q4acs/ ) with the Open Science Framework.
Collapse
Affiliation(s)
- Ivan Jukic
- Sport Performance Research Institute New Zealand (SPRINZ), Auckland University of Technology, Auckland, New Zealand.
- School of Engineering, Computer and Mathematical Sciences, Auckland University of Technology, Auckland, New Zealand.
| | - Alejandro Pérez Castilla
- Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain
| | - Amador García Ramos
- Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain
- Department of Sports Sciences and Physical Conditioning, Faculty of Education, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Bas Van Hooren
- Department of Nutrition and Movement Sciences, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Michael R McGuigan
- Sport Performance Research Institute New Zealand (SPRINZ), Auckland University of Technology, Auckland, New Zealand
| | - Eric R Helms
- Sport Performance Research Institute New Zealand (SPRINZ), Auckland University of Technology, Auckland, New Zealand
| |
Collapse
|
5
|
Lawson D, Vann C, Schoenfeld BJ, Haun C. Beyond Mechanical Tension: A Review of Resistance Exercise-Induced Lactate Responses & Muscle Hypertrophy. J Funct Morphol Kinesiol 2022; 7:jfmk7040081. [PMID: 36278742 PMCID: PMC9590033 DOI: 10.3390/jfmk7040081] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 09/27/2022] [Accepted: 09/29/2022] [Indexed: 11/07/2022] Open
Abstract
The present review aims to explore and discuss recent research relating to the lactate response to resistance training and the potential mechanisms by which lactate may contribute to skeletal muscle hypertrophy or help to prevent muscle atrophy. First, we will discuss foundational information pertaining to lactate including metabolism, measurement, shuttling, and potential (although seemingly elusive) mechanisms for hypertrophy. We will then provide a brief analysis of resistance training protocols and the associated lactate response. Lastly, we will discuss potential shortcomings, resistance training considerations, and future research directions regarding lactate's role as a potential anabolic agent for skeletal muscle hypertrophy.
Collapse
Affiliation(s)
- Daniel Lawson
- School of Kinesiology, Applied Health and Recreation, Oklahoma State University, Stillwater, OK 74078, USA
- Correspondence:
| | - Christopher Vann
- Duke Molecular Physiology Institute, Duke University School of Medicine, Duke University, Durham, NC 27701, USA
| | - Brad J. Schoenfeld
- Department of Exercise Science and Recreation, Lehman College of CUNY, Bronx, NY 10468, USA
| | - Cody Haun
- Fitomics, LLC, Alabaster, AL 35007, USA
| |
Collapse
|
6
|
Mang ZA, Realzola RA, Ducharme J, Bellissimo GF, Beam JR, Mermier C, de Castro Magalhaes F, Kravitz L, Amorim FT. The effect of repetition tempo on cardiovascular and metabolic stress when time under tension is matched during lower body exercise. Eur J Appl Physiol 2022; 122:1485-1495. [PMID: 35394146 DOI: 10.1007/s00421-022-04941-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 03/22/2022] [Indexed: 12/31/2022]
Abstract
PURPOSE To investigate the effect of repetition tempo on cardiovascular and metabolic stress when time under tension (TUT) and effort are matched during sessions of lower body resistance training (RT). METHODS In a repeated-measures, cross-over design, 11 recreationally trained females (n = 5) and males (n = 6) performed 5 sets of belt squats under the following conditions: slow-repetition tempo (SLOW; 10 reps with 4-s eccentric and 2-s concentric) and traditional-repetition tempo (TRAD; 20 reps with 2-s eccentric and 1-s concentric). TUT (60 s) was matched between conditions and external load was adjusted so that lifters were close to concentric muscular failure at the end of each set. External load, total volume load (TVL), impulse (IMP), blood lactate, ratings of perceived exertion (RPE), HR, and muscle oxygenation were measured. RESULTS Data indicated that TVL (p < 0.001), blood lactate (p = 0.017), RPE (p = 0.015), and HR (p < 0.001) were significantly greater during TRAD while external load (p = 0.030) and IMP (p = 0.002) were significantly greater during SLOW. Whether it was expressed as minimal values or change scores, muscle oxygenation was not different between protocols. CONCLUSION When TUT is matched, TVL, cardiovascular stress, metabolic stress, and perceived exertion are greater when faster repetition tempos are used. In contrast, IMP and external load are greater when slower repetition tempos are used.
Collapse
Affiliation(s)
- Zachary A Mang
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA.
| | - Rogelio A Realzola
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | - Jeremy Ducharme
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | | | - Jason R Beam
- School of Fitness Education, Santa Fe Community College, Santa Fe, NM, 87508, USA
| | - Christine Mermier
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | - Flavio de Castro Magalhaes
- Department of Physical Education, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil
| | - Len Kravitz
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | - Fabiano T Amorim
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| |
Collapse
|
7
|
Zhao H, Nishioka T, Okada J. Validity of using perceived exertion to assess muscle fatigue during resistance exercises. PeerJ 2022; 10:e13019. [PMID: 35251786 PMCID: PMC8896022 DOI: 10.7717/peerj.13019] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 02/07/2022] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND The rating of perceived exertion (RPE) is correlated with physiological variables. The purpose of this study was to assess the validity of using the Borg CR-10 scale and velocity to predict muscle fatigue assessed by surface electromyography during single joint resistance exercises. METHODS Fifteen healthy males underwent different fatigue levels of unilateral elbow flexion (EF) and knee extension (KE), consisting of low, medium, and high volumes at 65% of their one-repetition maximum. The RPEs, spectral fatigue index (SFI), and mean velocity of the experimental exercises were assessed throughout the trials. RESULTS Significant differences in overall RPE (p < 0.001) and average SFI (p < 0.001) were observed between the conditions in both exercises. Significant changes in RPE and SFI (p < 0.001) were observed throughout the EF, whereas a SFI increase (p < 0.001) was only observed at the end point of KE. Multiple regression analyses revealed two significant models (p < 0.001) for the prediction of muscle fatigue during EF (R2 = 0.552) and KE (R2 = 0.377). CONCLUSIONS Muscle fatigue resulted in similar increases in perceptual responses, demonstrating that RPE is useful for assessing fatigue when resistance exercise is performed. However, velocity changes may not reflect muscle fatigue correctly when exercise is no longer performed in an explosive manner. We recommend combining RPE responses with velocity changes to comprehensively assess muscle fatigue during clinical and sports situations.
Collapse
Affiliation(s)
- Hanye Zhao
- Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan
| | - Takuya Nishioka
- Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan
| | - Junichi Okada
- Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan
| |
Collapse
|
8
|
Mang ZA, Ducharme JB, Mermier C, Kravitz L, de Castro Magalhaes F, Amorim F. Aerobic Adaptations to Resistance Training: The Role of Time under Tension. Int J Sports Med 2022; 43:829-839. [PMID: 35088396 DOI: 10.1055/a-1664-8701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Generally, skeletal muscle adaptations to exercise are perceived through a dichotomous lens where the metabolic stress imposed by aerobic training leads to increased mitochondrial adaptations while the mechanical tension from resistance training leads to myofibrillar adaptations. However, there is emerging evidence for cross over between modalities where aerobic training stimulates traditional adaptations to resistance training (e.g., hypertrophy) and resistance training stimulates traditional adaptations to aerobic training (e.g., mitochondrial biogenesis). The latter is the focus of the current review in which we propose high-volume resistance training (i.e., high time under tension) leads to aerobic adaptations such as angiogenesis, mitochondrial biogenesis, and increased oxidative capacity. As time under tension increases, skeletal muscle energy turnover, metabolic stress, and ischemia also increase, which act as signals to activate the peroxisome proliferator-activated receptor gamma coactivator 1-alpha, which is the master regulator of mitochondrial biogenesis. For practical application, the acute stress and chronic adaptations to three specific forms of high-time under tension are also discussed: Slow-tempo, low-intensity resistance training, and drop-set resistance training. These modalities of high-time under tension lead to hallmark adaptations to resistance training such as muscle endurance, hypertrophy, and strength, but little is known about their effect on traditional aerobic training adaptations.
Collapse
Affiliation(s)
- Zachary Aaron Mang
- Health, Exercise, and Sports Science, University of New Mexico, Albuquerque, United States
| | - Jeremy B Ducharme
- Health, Exercise, and Sports Science, University of New Mexico - Albuquerque, Albuquerque, United States
| | - Christine Mermier
- Health, Exercise, and Sports Science, University of New Mexico, Albuquerque, United States
| | - Len Kravitz
- Health, Exercise, and Sports Science, University of New Mexico, Albuquerque, United States
| | - Flavio de Castro Magalhaes
- Department of Physical Education, Federal University of the Jequitinhonha and Mucuri Valleys, Diamantina, Brazil
| | - Fabiano Amorim
- Health, Exercise, and Sports Science, University of New Mexico, Albuquerque, United States
| |
Collapse
|
9
|
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.
Collapse
|
10
|
Millender DJ, Mang ZA, Beam JR, Realzola RA, Kravitz L. The Effect of Rest Interval Length on Upper and Lower Body Exercises in Resistance-Trained Females. INTERNATIONAL JOURNAL OF EXERCISE SCIENCE 2021; 14:1178-1191. [PMID: 35096249 PMCID: PMC8758160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The purpose of this study was to investigate the effects of SHORT (1 min) and LONG (3 min) rest intervals (RI) on total volume lifted (TVL), repetition performance, fatigue index (FI), and blood lactate [La] during upper body (chest press) and lower body (leg press) exercise with low-intensity (75% of a 10-RM) in trained female lifters. Fourteen females (mean ± SD, age = 22.9 ± 5.4 years, training experience = 5.2 ± 2.5 years, height = 166.1 ± 6.9 cm, weight = 61.3 ± 5.1 kg, body fat % = 21.7 ± 3.3%) participated in this randomized, repeated-measures, cross-over design study. They performed four sets to failure on chest press (CP) and leg press (LP) under two conditions (SHORT and LONG RIs) in a counterbalanced manner. Paired-samples t-tests were used to analyze mean differences for TVL in CP and LP, separately. A 2 (exercise) x 2 (rest interval) repeated measures ANOVA was used to analyze mean differences in FI and average [La] values. A 2 (rest interval) x 4 (sets) repeated measures ANOVA was used to analyze mean differences in repetitions completed for each exercise. TVL for SHORT was significantly less when compared to LONG for both exercises. There was no significant difference in average [La] between RIs despite a greater FI in SHORT compared to LONG for both exercises. Lastly, [La] was higher during LP compared to CP irrespective of RI length. These results suggest that longer RIs are better for female lifters who want to optimize TVL with low-intensity resistance training. Metabolic stress, as measured by blood lactate, was greater during lower-body exercise.
Collapse
Affiliation(s)
- Desmond J Millender
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, NM, USA
| | - Zachary A Mang
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, NM, USA
| | - Jason R Beam
- School of Fitness Education, Santa Fe Community College, Santa Fe, NM, USA
| | - Rogelio A Realzola
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, NM, USA
| | - Len Kravitz
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, NM, USA
| |
Collapse
|