Heart rate, resting O2, exercise O2, and EPOC were measured via indirect calorimetry with a metabolic cart (Parvo Medics True One 2400, Sandy, UT, USA) in 15-second sampling periods. Age-predicted maximum heart rate was estimated using the Gellish formula, 206.9−0.67 × age (1). All blood-lactate measurements were recorded in duplicate using 2 handheld lactate analyzers (Lactate Plus Meter; Nova Biomedical, Waltham, MA) and were averaged for data analysis.
Aerobic energy expenditure was estimated at 1 L O2 = 21.1 kJ (22). To estimate anaerobic energy expenditure, the authors utilized non–steady-state O2 uptake measurements methods previously described by Scott et al. (27,28,29,30). Anaerobic energy expenditure was determined from the difference between peak and resting blood lactate measures, multiplied by body weight, then by 3.0 mL of O2 (22). Conversions to O2 equivalents were subsequently converted to kJ as 1 L of O2 = 21.1 kJ (26,27,28,29). Resting O2 and EPOC were converted to energy expenditure as 1 L of O2 = 19.6 kJ to dismiss the glycolytic component from the O2 measure (27,28,29,30). Total energy expenditure was calculated by summing aerobic energy expenditure, anaerobic energy expenditure, and EPOC (27,28,29,30).
All data were analyzed using IBM SPSS Statistics (version 21). Independent samples t-tests were used to analyze for gender differences between cardiovascular and metabolic measurements. Due to the large number of t-tests conducted, a Bonferroni correction was used to control the global Type I error rate at α = 0.05 for the 11 between gender comparisons. Thus, statistical significance was defined as p ≤ 0.05/11 = 0.0045. Cohen's d effect sizes were calculated (M 1−M 2/pooled SD) to assess the meaningfulness of significant differences, with effect sizes >0.8 considered large (9).
Descriptive statistics of the cardiovascular and metabolic variables of rope training are presented in Table 2. All data are presented as mean ± SD. Throughout the 10-minute testing protocol, subjects averaged 25 ± 4 rope undulations per 15-second work interval. Peak lactate levels were 11.9 ± 1.4 mmol, and average EPOC length was 13.4 ± 4.1 minutes. The average heart rate throughout the 10-minute session was 163 ± 11 bpm, which was 86% of age-predicted max. Peak heart rates reached 178 ± 11 b·min−1, 94% of age-predicted max, and peak METs averaged 10.1 ± 1.6.
Male subjects demonstrated significantly greater differences than females with large effect sizes for aerobic energy expenditure (487.6 ± 64.0 vs. 258.1 ± 30.3 kJ, p < 0.001, d = 4.6), total energy expenditure (622.2 ± 85.5 vs. 338.3 ± 44.8 kJ, p < 0.001, d = 4.1), kJ·min−1, (54.9 ± 7.5 vs. 29.9 ± 3.2, p < 0.001, d = 4.3), peak
(40.2 ± 3 vs. 31.3 ± 2.9 mL·kg−1·min−1, p = 0.001, d = 2.9), and peak METs (11.5 ± 0.9 vs. 9.0 ± 0.8, p = 0.001, d = 3.1).
The results of this study suggest that an acute 10-minute bout of rope training is a vigorous workout, resulting in very high heart rates (86% of age predicted max heart rate) and energy expenditure per unit of time (41 kJ·min−1). According to American College of Sports Medicine standards for cardiorespiratory fitness, the cardiovascular and metabolic demands of rope training would be classified as vigorous-intensity exercise (1,2); therefore, rope training may be most appropriate for individuals acclimated to high habitual amounts of vigorous-intensity exercise (1).
Significant differences in aerobic and total energy expenditure were observed between genders; however, this may be accounted for by the 30 kg average difference in weight between males and females. No significant gender differences were observed for peak lactate, EPOC length, average heart rate, or peak heart rate, suggesting that when controlled for bodyweight, males and females will have similar responses to the cardiovascular demands of rope training (20). Nevertheless, due to inherent male and female strength differences, the fitness professional may want to consider ropes of a smaller length and diameter when incorporating rope training with females.
As mentioned previously, no published research has examined rope training, making comparisons and conclusions rather limited at this time. However, the metabolic demands of rope training are most similar to other upper-body modes of cardiovascular conditioning, such as training with kettlebells. In a population similar to the present study, a 10-minute kettlebell routine consisting of 35-second swing intervals followed by 25-second rest intervals resulted in average heart rates of 180 ± 12 b·min−1, average
of 34.1 ± 4.7 mL·kg−1·min−1, and kJ·min−1 of 52.3 ± 10.5 (15). Another similar kettlebell study found that a 12-minute kettlebell routine also resulted in similar metabolic demands, with an average
of 26.5 ± 4.9 mL·kg−1·min−1and average heart rates of 165 ± 13 b·min−1 (13).
This study is not without limitations. First, the sample size was small and included only physically active young adults with an intercollegiate athletic background. Therefore, care is needed when generalizing the findings to other populations, particularly those who may be less active. Second, because no length or diameter of rope is standard when rope training, our findings may only apply to the use of 15.2-m length, 3.8-cm diameter rope. Ropes of differing diameter and length may result in a varied cardiovascular response, thus smaller sized ropes may be more appropriate dependent on the activity level and physical strength of the target population. Additionally, this study examined only a double arm wave method of rope undulation. Therefore, the results of this study may only apply to rope training in which the lower body is static. Third, the results of this study are from 1 acute bout of rope training. Therefore, it is not known at this time if an improved economy of rope training technique in latter phases of training would result in reduced cardiovascular and metabolic demands. Fourth, maximum heart rate data was predicted and not objectively determined via
max testing, thus percent max values reported are duly noted as estimates. Furthermore, when compared with lower-body exercise, upper-body exercises produce greater physiologic strain (heart rate and blood pressure), thus it has been recommended that exercise prescriptions based on lower body cannot be applied to upper-body exercise (20). Due to the unique upper-body demands, rope training may place on an individual subjective workload assessments such as ratings of perceived exertion or talk tests may be more appropriate than percent max heart rate when initially assigning workload (1).
Collectively, the results of previous studies assessing metabolic demands of kettlebells and the current study using rope training provide evidence that these novel high-intensity upper-body exercises meet previously established thresholds known to increase cardiorespiratory fitness (1). Future research concerning rope training would be well served to investigate acute responses to various sized ropes and undulation protocols, along with chronic adaptations for individuals seeking changes in body composition, cardiovascular conditioning, or performance enhancement.
Rope training provides a vigorous-intensity cardiovascular and metabolic stimulus, as demonstrated by elevated heart rate and energy expenditure per unit of time. Our results suggest that rope training can provide a high-intensity stimulus for strength and conditioning professionals who seek alternative or reduced impact-conditioning methods for athletes or clients.
The authors wish to thank Eric Adolph, CSCS, and Chris Sheckler, CSCS, for their assistance in data collection and instruction.
1. American College of Sports Medicine. ACSM's Guidelines for Exercise Testing and Prescription. 8th ed. Philadelphia, PA: Lippincott Williams & Wilkins, 2010.
2. American College of Sports Medicine. Position stand: Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: Guidance for prescribing exercise. Med Sci Sports Exerc 43: 1334–1359, 2011.
3. Amonette WE, English KL, Spiering BA, Kraemer WJ. Evidence-based practice in strength and conditioning. In: Chandler TJ, Brown LE, eds. Conditioning for Strength and Human Performance. 2nd ed. Philadelphia, PA: Lippincott Williams & Wilkins, 2012. pp. 285–303.
4. Battling Ropes® Homepage [Internet]. Pinehurst, NC: John Brookfield, 2013. Available at: http://www.powerropes.com
. Accessed March 22, 2013.
5. Cissik JM. Strength training tools for the track and field coach: A brief review. Track Cross Country J 1: 4–8, 2012.
7. Cook EG. Movement: Functional Movement Systems: Screening, Assessment, Corrective Strategies. Santa Cruz, CA: On Target Publications, 2010.
8. Cramer JT. Bioenergetics of exercise and training. In: Baechle TR, Earle RW, eds. Essentials of Strength Training and Conditioning. 3rd ed. Champaign, IL: Human Kinetics, 2008. pp. 21–40.
9. Dancey CP, Reidy JG, Rowe R. Statistics for the Health Sciences: A Non-Mathematical Introduction. London, United Kingdom: Sage Publications, 2012.
10. Dos Remedios R. Cardio Strength Training. New York, NY: Rodale Inc., 2009.
11. Dudgeon WD, Aartun JD, Thomas DD, Herrin J, Scheet TP. Effects of suspension training on the growth hormone axis. J Strength Cond Res 25: S62, 2011.
12. Evans RK, Scoville CR, Ito MA, Mello RP. Upper body fatiguing exercise and shooting performance. Mil Med 168: 451–456, 2003.
13. Farrar RE, Mayhew JL, Koch AJ. Oxygen cost of kettlebell swings. J Strength Cond Res 24: 1034–1036, 2010.
14. Halvorson R. 30 essential pieces of equipment for the successful personal training studio. IDEA Fitness J 9: 78–89, 2012.
15. Hulsey CR, Soto DT, Koch AJ, Mayhew JL. Comparison of kettlebell swings and treadmill running at equivalent rating of perceived exertion values. J Strength Cond Res 26: 1203–1207, 2012.
16. Hutchins A. Excess post-exercise oxygen consumption and peak blood lactate following a maximal bout with the battling ropes power wave. Master's thesis, Georgia College and State University, Georgia, 2012.
17. LaForgia J, Withers RT, Gore CJ. Effects of exercise intensity and duration on the excess post-exercise oxygen consumption. J Sports Sci 24: 1247–1264, 2006.
18. Leahy G. Kettlebell training: What does the science say? NSCA TSAC Rep 27: 3–5, 2013.
19. Martino M, Dawes J. Battling ropes: A dynamic training tool for the tactical athlete. J Aust Strength Cond 20: 52–57, 2012.
20. McArdle WD, Katch FI, Katch VL. Exercise Physiology: Nutrition, Energy, and Human Performance. 7th ed. Philadelphia, PA: Lippincott Williams & Wilkins, 2010.
21. Morton C. The power of ropes. Train Cond 22: 13–21, 2012.
22. di Prampero PE, Ferretti G. The energetics of anaerobic muscle metabolism: A reappraisal of older and more recent concepts. Respir Physiol 118: 103–115, 1999.
23. Rooney M. Warrior Cardio. New York, NY: Harper Collins Publishers, 2012.
24. Santana JC, Fukuda DH. Unconventional methods, techniques, and equipment for strength and conditioning in combat sports. Strength Cond J 33: 64–70, 2011.
25. Scheet TP, Aartun JD, Thomas DD, Herrin J, Dudgeon WD. Anabolic hormone responses to an acute bout of suspension training. J Strength Cond Res 25: S61–S62, 2011.
26. Schottstall JE, Titcomb DA, Kilbourne BF. Electromyographic response of the abdominal musculature to varying abdominal exercises. J Strength Cond Res 24: 3422–3426, 2010.
27. Scott CB. Contributions of blood lactate to the energy expenditure
of resistance training. J Strength Cond Res 20: 404–411, 2006.
28. Scott CB, Croteau A, Ravlo T. Energy expenditure
before, during and after the bench press. J Strength Cond Res 23: 611–618, 2009.
29. Scott CB, Leighton BH, Ahearn KJ, McManus JJ. Aerobic, anaerobic, and excess postexercise oxygen consumption energy expenditure
of muscular endurance and strength: 1-set of bench press to muscular fatigue. J Strength Cond Res 25: 903–908, 2011.
30. Scott CB. Quantifying the immediate recovery energy expenditure
of resistance training. J Strength Cond Res 25: 1159–1163, 2011.
31. Williams C. Keep it fresh: Incorporating multiple modalities. NSCA Perform Train J 12: 17–18, 2013.
Keywords:Copyright © 2015 by the National Strength & Conditioning Association.
battle rope; cardiovascular conditioning; energy expenditure; undulation training