|The less you rest, the more you burn.|
Sounds great? Well, in that case let's get to the study designs and results without further ado.
- The Effects of Rest Interval Length on Acute Battling Rope
Exercise Metabolism (Ratamess. 2015) - From a 2014 SuppVersity article you already know that battling the rope can get you ripped and jacked. A detailed analysis of the metabolic response to the "battle with the rope" was yet never conducted. With their latest study Nicholas A. Ratamess et al. are filling the gap.
The purpose of the present study was to quantify and compare the acute metabolic responses to battling rope exercise utilizing two different rest intervals. Twelve men and ten women (age =20.8 ± 1.3 yrs) performed a control protocol and two battling rope exercise protocols on separate days (48 to 72 hours) in random order while connected to a metabolic system.
Figure 1: Aerobic, anaerobic and post-exercise energy expenditure (kj/min) in 22 healthy, regularly exercising college-aged men (N = 12) and women (N = 10) using 1- and 2-minute rest intervals (Ratamess. 2015). Battle yourself lean | more
If you take a look at the energy expenditure bars in Figure 1 it is yet obvious that the extra-effort is well worth it for anyone trying to shed body fat - plus: based on the significant increase in heart rate you can expect to see more pronounced increases in fitness with the more intense 1-minute-rest protocol.
- Enhancing Short-Term Recovery After High Intensity Anaerobic Exercise (Al-Nawaiseh. 2015) - You probably know a few things that are supposed to help you recover, right? Vitamin C, vitamin E, NSAIDs, protein, cold water immersion, those are "only" five of the things athletes do because they believe that they'd give them the recovery edge.
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The participants were randomly assigned in counterbalanced order to start the first week as a treatment or as a control (non-treatment):
"In the treatment trial, participants were provided with two oral doses of 1000 mg of vitamin C (ascorbic acid with citrus bioflavonoids, General Nutrition Corp, PA, USA) and 400 IU of Vitamin E soft gel capsules (d-alpha tocopherol, General Nutrition Corp, PA, USA). The first dose was taken with dinner the night before the exercise protocol, and the second dose was taken on the morning of the exercise test. The morning doses were consumed at least 1 hour before the blood sample was taken. Ibuprofen doses (400 mg; two ADVIL liquid gels, 200 mg capsules, Wyeth Consumer Healthcare, Madison, NJ, USA) were given to participants 30 min before each exercise session. The protein supplement, 23 g of whey protein (10.6 g EAA, 7.3 g of conditionally essential amino acids CEAA, and 5.6 g of NEAA ON® Sunrise, FL, USA), was mixed with 200 ml of skimmed milk to form a protein shake. The protein shake was given to participants within 3 min of finishing each exercise session in the treatment trial. Three to five minutes after the end of each exercise session, participants submerged their lower body in cold (10-12.5 °C) water for 10 min" (Al-Nawaiseh. 2015).Thusly fortified, the subjects didn't just feel less fatigued before the PM trials, they also performed at significantly higher mean intensities and reduced pain.
Figure 2: Mean power and perceived pain rating during the two AM and PM Wingate protocols with and without the use of the five short-term recovery boosters (Al-Nawaiseh. 2015).
- The effects of 5-week resistance training in hypoxia on hormones and muscle strength (Yan. 2015) - You will remember from previous articles about hypoxia and training in low oxygen environments that you can use the lack of O2 to your endurance advantage. Originally, high altitude / low oxygen training were recommend mostly to endurance athletes. More recently, however, the evidence that training in hypoxia can benefit strength athletes, as well, is accumulating. Evidence like the results of a recent study from China in which the scientists tested the effects of different levels of systemic hypoxia on hormonal responses, strength and body composition changes during a 5-week resistance training.
Twenty-five male subjects were randomly assigned into 3 experimental groups that performed 10 sessions (2 sessions/week) of barbell back squat (10 reps, 5 sets, 70% 1RM) under normoxia (NR, FiO2=21%) and hypoxia (HL, FiO2=16%; HH, FiO2=12.6%). Serum growth hormone (GH), testosterone (T) and cortisol (C) concentrations were measured before (Pre) and at 0 (T-0), 15 (T-15), 30 (T-30) min after exercise in the first and last training sessions. 1RM, isometric knee extension (KE), isometric leg press (LP) and body composition were evaluated before and after the protocol.
Figure 3: Changes in body composition and strength - that's what really counts (Yan. 2015).
Following the training protocol, HH showed greater (p<0.05) improvement of isometric LP strength compared with NR; lean body mass (LBM) was increased in hypoxia groups only. Moderate intensity resistance training performed in severe hypoxia (FiO2=12.6%) induced greater GH responses and isometric strength gains in leg press than that in normoxia. What is more important than the GH and testosterone / cortisol increases are the beneficial effects on lean mass, strength and body fat which occurred in both the low and the very low oxygen condition - the additional hormonal bonus in the HH (12.6% O2) trial is nice, but over the relatively short study period it did not pay off.
- Al-Nawaiseh, Ali M., Robert C. Pritchett, and Philip A. Bishop. "Enhancing Short-Term Recovery After High Intensity Anaerobic Exercise." The Journal of Strength & Conditioning Research (2015).
- Ratamess, Nicholas A., et al. "The Effects of Rest Interval Length on Acute Battling Rope Exercise Metabolism." Journal of strength and conditioning research/National Strength & Conditioning Association (2015).
- Yan, Bing, et al. "The effects of 5-week resistance training in hypoxia on hormones and muscle strength." The Journal of Strength & Conditioning Research (2015).